arm: tegra: add Trusted Foundations hooks and driver

Add CONFIG_TRUSTED_FOUNDATIONS build option and calls to issue
SMCs to the TL secure monitor (used when needing to update state
not writable by non-secure code).

Make security/tf_driver an optional part of the build, which is
part of the TL framework to interact with secure services.

Bug 883391

Change-Id: I9c6c14ff457fb3a0c612d558fe731a17c2480750
Signed-off-by: Chris Johnson <cwj@nvidia.com>
Reviewed-on: http://git-master/r/65616
Reviewed-by: Varun Colbert <vcolbert@nvidia.com>
Tested-by: Varun Colbert <vcolbert@nvidia.com>

13 files changed, 7968 insertions, 0 deletions

diff --git a/security/tf_driver/Kconfig b/security/tf_driver/Kconfig
new file mode 100644
index 000000000000..2a980c5ade43
--- /dev/null
+++ b/security/tf_driver/Kconfig
@@ -0,0 +1,8 @@
+config TRUSTED_FOUNDATIONS
+	bool "Enable TF Driver"
+	default n
+        select CRYPTO_SHA1
+	help
+	  This option adds kernel support for communication with the Trusted Foundations.
+	  If you are unsure how to answer this question, answer N.
+
diff --git a/security/tf_driver/Makefile b/security/tf_driver/Makefile
new file mode 100644
index 000000000000..dfadb7d97406
--- /dev/null
+++ b/security/tf_driver/Makefile
@@ -0,0 +1,36 @@
+#
+# Copyright (c) 2006-2010 Trusted Logic S.A.
+# All Rights Reserved.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 2 of
+# the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+# MA 02111-1307 USA
+#
+
+# debug options
+#EXTRA_CFLAGS += -O0 -DDEBUG -D_DEBUG -DCONFIG_TF_DRIVER_DEBUG_SUPPORT
+EXTRA_CFLAGS += -DNDEBUG
+EXTRA_CFLAGS += -DLINUX -DCONFIG_TF_TRUSTZONE -DCONFIG_TFN
+
+ifdef S_VERSION_BUILD
+EXTRA_CFLAGS += -DS_VERSION_BUILD=$(S_VERSION_BUILD)
+endif
+
+tf_driver-objs += tf_util.o
+tf_driver-objs += tf_conn.o
+tf_driver-objs += tf_device.o
+tf_driver-objs += tf_comm.o
+tf_driver-objs += tf_comm_tz.o
+
+obj-$(CONFIG_TRUSTED_FOUNDATIONS) += tf_driver.o
diff --git a/security/tf_driver/s_version.h b/security/tf_driver/s_version.h
new file mode 100644
index 000000000000..6244d3fe7e8d
--- /dev/null
+++ b/security/tf_driver/s_version.h
@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 2011 Trusted Logic S.A.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef __S_VERSION_H__
+#define __S_VERSION_H__
+
+/*
+ * Usage: define S_VERSION_BUILD on the compiler's command line.
+ *
+ * Then set:
+ * - S_VERSION_OS
+ * - S_VERSION_PLATFORM
+ * - S_VERSION_MAIN
+ * - S_VERSION_ENG is optional
+ * - S_VERSION_PATCH is optional
+ * - S_VERSION_BUILD = 0 if S_VERSION_BUILD not defined or empty
+ */
+
+#define S_VERSION_OS "A"          /* "A" for all Android */
+#define S_VERSION_PLATFORM "B"    /* "B" for Tegra3 */
+
+/*
+ * This version number must be updated for each new release
+ */
+#define S_VERSION_MAIN  "01.03"
+
+/*
+* If this is a patch or engineering version use the following
+* defines to set the version number. Else set these values to 0.
+*/
+#define S_VERSION_ENG 0
+#define S_VERSION_PATCH 0
+
+#ifdef S_VERSION_BUILD
+/* TRICK: detect if S_VERSION is defined but empty */
+#if 0 == S_VERSION_BUILD-0
+#undef  S_VERSION_BUILD
+#define S_VERSION_BUILD 0
+#endif
+#else
+/* S_VERSION_BUILD is not defined */
+#define S_VERSION_BUILD 0
+#endif
+
+#define __STRINGIFY(X) #X
+#define __STRINGIFY2(X) __STRINGIFY(X)
+
+#if S_VERSION_ENG != 0
+#define _S_VERSION_ENG "e" __STRINGIFY2(S_VERSION_ENG)
+#else
+#define _S_VERSION_ENG ""
+#endif
+
+#if S_VERSION_PATCH != 0
+#define _S_VERSION_PATCH "p" __STRINGIFY2(S_VERSION_PATCH)
+#else
+#define _S_VERSION_PATCH ""
+#endif
+
+#if !defined(NDEBUG) || defined(_DEBUG)
+#define S_VERSION_VARIANT "D   "
+#else
+#define S_VERSION_VARIANT "    "
+#endif
+
+#define S_VERSION_STRING \
+	"TFN" \
+	S_VERSION_OS \
+	S_VERSION_PLATFORM \
+	S_VERSION_MAIN \
+	_S_VERSION_ENG \
+	_S_VERSION_PATCH \
+	"."  __STRINGIFY2(S_VERSION_BUILD) " " \
+	S_VERSION_VARIANT
+
+#endif /* __S_VERSION_H__ */
diff --git a/security/tf_driver/tf_comm.c b/security/tf_driver/tf_comm.c
new file mode 100644
index 000000000000..8b12f293eabf
--- /dev/null
+++ b/security/tf_driver/tf_comm.c
@@ -0,0 +1,1745 @@
+/**
+ * Copyright (c) 2011 Trusted Logic S.A.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <asm/div64.h>
+#include <asm/system.h>
+#include <linux/version.h>
+#include <asm/cputype.h>
+#include <linux/interrupt.h>
+#include <linux/page-flags.h>
+#include <linux/pagemap.h>
+#include <linux/vmalloc.h>
+#include <linux/jiffies.h>
+#include <linux/freezer.h>
+
+#include "tf_defs.h"
+#include "tf_comm.h"
+#include "tf_protocol.h"
+#include "tf_util.h"
+#include "tf_conn.h"
+
+#ifdef CONFIG_TF_ZEBRA
+#include "tf_zebra.h"
+#endif
+
+/*---------------------------------------------------------------------------
+ * Internal Constants
+ *---------------------------------------------------------------------------*/
+
+/*
+ * shared memories descriptor constants
+ */
+#define DESCRIPTOR_B_MASK           (1 << 2)
+#define DESCRIPTOR_C_MASK           (1 << 3)
+#define DESCRIPTOR_S_MASK           (1 << 10)
+
+#define L1_COARSE_DESCRIPTOR_BASE         (0x00000001)
+#define L1_COARSE_DESCRIPTOR_ADDR_MASK    (0xFFFFFC00)
+#define L1_COARSE_DESCRIPTOR_V13_12_SHIFT (5)
+
+#define L2_PAGE_DESCRIPTOR_BASE              (0x00000003)
+#define L2_PAGE_DESCRIPTOR_AP_APX_READ       (0x220)
+#define L2_PAGE_DESCRIPTOR_AP_APX_READ_WRITE (0x30)
+
+#define L2_INIT_DESCRIPTOR_BASE           (0x00000003)
+#define L2_INIT_DESCRIPTOR_V13_12_SHIFT   (4)
+
+/*
+ * Reject an attempt to share a strongly-Ordered or Device memory
+ * Strongly-Ordered:  TEX=0b000, C=0, B=0
+ * Shared Device:     TEX=0b000, C=0, B=1
+ * Non-Shared Device: TEX=0b010, C=0, B=0
+ */
+#define L2_TEX_C_B_MASK \
+	((1<<8) | (1<<7) | (1<<6) | (1<<3) | (1<<2))
+#define L2_TEX_C_B_STRONGLY_ORDERED \
+	((0<<8) | (0<<7) | (0<<6) | (0<<3) | (0<<2))
+#define L2_TEX_C_B_SHARED_DEVICE \
+	((0<<8) | (0<<7) | (0<<6) | (0<<3) | (1<<2))
+#define L2_TEX_C_B_NON_SHARED_DEVICE \
+	((0<<8) | (1<<7) | (0<<6) | (0<<3) | (0<<2))
+
+#define CACHE_S(x)      ((x) & (1 << 24))
+#define CACHE_DSIZE(x)  (((x) >> 12) & 4095)
+
+#define TIME_IMMEDIATE ((u64) 0x0000000000000000ULL)
+#define TIME_INFINITE  ((u64) 0xFFFFFFFFFFFFFFFFULL)
+
+/*---------------------------------------------------------------------------
+ * atomic operation definitions
+ *---------------------------------------------------------------------------*/
+
+/*
+ * Atomically updates the sync_serial_n and time_n register
+ * sync_serial_n and time_n modifications are thread safe
+ */
+void tf_set_current_time(struct tf_comm *comm)
+{
+	u32 new_sync_serial;
+	struct timeval now;
+	u64 time64;
+
+	/*
+	 * lock the structure while updating the L1 shared memory fields
+	 */
+	spin_lock(&comm->lock);
+
+	/* read sync_serial_n and change the TimeSlot bit field */
+	new_sync_serial =
+		tf_read_reg32(&comm->l1_buffer->sync_serial_n) + 1;
+
+	do_gettimeofday(&now);
+	time64 = now.tv_sec;
+	time64 = (time64 * 1000) + (now.tv_usec / 1000);
+
+	/* Write the new time64 and nSyncSerial into shared memory */
+	tf_write_reg64(&comm->l1_buffer->time_n[new_sync_serial &
+		TF_SYNC_SERIAL_TIMESLOT_N], time64);
+	tf_write_reg32(&comm->l1_buffer->sync_serial_n,
+		new_sync_serial);
+
+	spin_unlock(&comm->lock);
+}
+
+/*
+ * Performs the specific read timeout operation
+ * The difficulty here is to read atomically 2 u32
+ * values from the L1 shared buffer.
+ * This is guaranteed by reading before and after the operation
+ * the timeslot given by the Secure World
+ */
+static inline void tf_read_timeout(struct tf_comm *comm, u64 *time)
+{
+	u32 sync_serial_s_initial = 0;
+	u32 sync_serial_s_final = 1;
+	u64 time64;
+
+	spin_lock(&comm->lock);
+
+	while (sync_serial_s_initial != sync_serial_s_final) {
+		sync_serial_s_initial = tf_read_reg32(
+			&comm->l1_buffer->sync_serial_s);
+		time64 = tf_read_reg64(
+			&comm->l1_buffer->timeout_s[sync_serial_s_initial&1]);
+
+		sync_serial_s_final = tf_read_reg32(
+			&comm->l1_buffer->sync_serial_s);
+	}
+
+	spin_unlock(&comm->lock);
+
+	*time = time64;
+}
+
+/*----------------------------------------------------------------------------
+ * SIGKILL signal handling
+ *----------------------------------------------------------------------------*/
+
+static bool sigkill_pending(void)
+{
+	if (signal_pending(current)) {
+		dprintk(KERN_INFO "A signal is pending\n");
+		if (sigismember(&current->pending.signal, SIGKILL)) {
+			dprintk(KERN_INFO "A SIGKILL is pending\n");
+			return true;
+		} else if (sigismember(
+			&current->signal->shared_pending.signal, SIGKILL)) {
+			dprintk(KERN_INFO "A SIGKILL is pending (shared)\n");
+			return true;
+		}
+	}
+	return false;
+}
+
+/*----------------------------------------------------------------------------
+ * Shared memory related operations
+ *----------------------------------------------------------------------------*/
+
+struct tf_coarse_page_table *tf_alloc_coarse_page_table(
+	struct tf_coarse_page_table_allocation_context *alloc_context,
+	u32 type)
+{
+	struct tf_coarse_page_table *coarse_pg_table = NULL;
+
+	spin_lock(&(alloc_context->lock));
+
+	if (!(list_empty(&(alloc_context->free_coarse_page_tables)))) {
+		/*
+		 * The free list can provide us a coarse page table
+		 * descriptor
+		 */
+		coarse_pg_table = list_first_entry(
+				&alloc_context->free_coarse_page_tables,
+				struct tf_coarse_page_table, list);
+		list_del(&(coarse_pg_table->list));
+
+		coarse_pg_table->parent->ref_count++;
+	} else {
+		/* no array of coarse page tables, create a new one */
+		struct tf_coarse_page_table_array *array;
+		void *page;
+		int i;
+
+		spin_unlock(&(alloc_context->lock));
+
+		/* first allocate a new page descriptor */
+		array = internal_kmalloc(sizeof(*array), GFP_KERNEL);
+		if (array == NULL) {
+			dprintk(KERN_ERR "tf_alloc_coarse_page_table(%p):"
+					" failed to allocate a table array\n",
+					alloc_context);
+			return NULL;
+		}
+
+		array->type = type;
+		INIT_LIST_HEAD(&(array->list));
+
+		/* now allocate the actual page the page descriptor describes */
+		page = (void *) internal_get_zeroed_page(GFP_KERNEL);
+		if (page == NULL) {
+			dprintk(KERN_ERR "tf_alloc_coarse_page_table(%p):"
+					" failed allocate a page\n",
+					alloc_context);
+			internal_kfree(array);
+			return NULL;
+		}
+
+		spin_lock(&(alloc_context->lock));
+
+		/* initialize the coarse page table descriptors */
+		for (i = 0; i < 4; i++) {
+			INIT_LIST_HEAD(&(array->coarse_page_tables[i].list));
+			array->coarse_page_tables[i].descriptors =
+				page + (i * SIZE_1KB);
+			array->coarse_page_tables[i].parent = array;
+
+			if (i == 0) {
+				/*
+				 * the first element is kept for the current
+				 * coarse page table allocation
+				 */
+				coarse_pg_table =
+					&(array->coarse_page_tables[i]);
+				array->ref_count++;
+			} else {
+				/*
+				 * The other elements are added to the free list
+				 */
+				list_add(&(array->coarse_page_tables[i].list),
+					&(alloc_context->
+						free_coarse_page_tables));
+			}
+		}
+
+		list_add(&(array->list),
+			&(alloc_context->coarse_page_table_arrays));
+	}
+	spin_unlock(&(alloc_context->lock));
+
+	return coarse_pg_table;
+}
+
+
+void tf_free_coarse_page_table(
+	struct tf_coarse_page_table_allocation_context *alloc_context,
+	struct tf_coarse_page_table *coarse_pg_table,
+	int force)
+{
+	struct tf_coarse_page_table_array *array;
+
+	spin_lock(&(alloc_context->lock));
+
+	array = coarse_pg_table->parent;
+
+	(array->ref_count)--;
+
+	if (array->ref_count == 0) {
+		/*
+		 * no coarse page table descriptor is used
+		 * check if we should free the whole page
+		 */
+
+		if ((array->type == TF_PAGE_DESCRIPTOR_TYPE_PREALLOCATED)
+			&& (force == 0))
+			/*
+			 * This is a preallocated page,
+			 * add the page back to the free list
+			 */
+			list_add(&(coarse_pg_table->list),
+				&(alloc_context->free_coarse_page_tables));
+		else {
+			/*
+			 * None of the page's coarse page table descriptors
+			 * are in use, free the whole page
+			 */
+			int i;
+			u32 *descriptors;
+
+			/*
+			 * remove the page's associated coarse page table
+			 * descriptors from the free list
+			 */
+			for (i = 0; i < 4; i++)
+				if (&(array->coarse_page_tables[i]) !=
+						coarse_pg_table)
+					list_del(&(array->
+						coarse_page_tables[i].list));
+
+			descriptors =
+				array->coarse_page_tables[0].descriptors;
+			array->coarse_page_tables[0].descriptors = NULL;
+
+			/* remove the coarse page table from the array  */
+			list_del(&(array->list));
+
+			spin_unlock(&(alloc_context->lock));
+			/*
+			 * Free the page.
+			 * The address of the page is contained in the first
+			 * element
+			 */
+			internal_free_page((unsigned long) descriptors);
+			/* finaly free the array */
+			internal_kfree(array);
+
+			spin_lock(&(alloc_context->lock));
+		}
+	} else {
+		/*
+		 * Some coarse page table descriptors are in use.
+		 * Add the descriptor to the free list
+		 */
+		list_add(&(coarse_pg_table->list),
+			&(alloc_context->free_coarse_page_tables));
+	}
+
+	spin_unlock(&(alloc_context->lock));
+}
+
+
+void tf_init_coarse_page_table_allocator(
+	struct tf_coarse_page_table_allocation_context *alloc_context)
+{
+	spin_lock_init(&(alloc_context->lock));
+	INIT_LIST_HEAD(&(alloc_context->coarse_page_table_arrays));
+	INIT_LIST_HEAD(&(alloc_context->free_coarse_page_tables));
+}
+
+void tf_release_coarse_page_table_allocator(
+	struct tf_coarse_page_table_allocation_context *alloc_context)
+{
+	spin_lock(&(alloc_context->lock));
+
+	/* now clean up the list of page descriptors */
+	while (!list_empty(&(alloc_context->coarse_page_table_arrays))) {
+		struct tf_coarse_page_table_array *page_desc;
+		u32 *descriptors;
+
+		page_desc = list_first_entry(
+			&alloc_context->coarse_page_table_arrays,
+			struct tf_coarse_page_table_array, list);
+
+		descriptors = page_desc->coarse_page_tables[0].descriptors;
+		list_del(&(page_desc->list));
+
+		spin_unlock(&(alloc_context->lock));
+
+		if (descriptors != NULL)
+			internal_free_page((unsigned long)descriptors);
+
+		internal_kfree(page_desc);
+
+		spin_lock(&(alloc_context->lock));
+	}
+
+	spin_unlock(&(alloc_context->lock));
+}
+
+/*
+ * Returns the L1 coarse page descriptor for
+ * a coarse page table located at address coarse_pg_table_descriptors
+ */
+u32 tf_get_l1_coarse_descriptor(
+	u32 coarse_pg_table_descriptors[256])
+{
+	u32 descriptor = L1_COARSE_DESCRIPTOR_BASE;
+	unsigned int info = read_cpuid(CPUID_CACHETYPE);
+
+	descriptor |= (virt_to_phys((void *) coarse_pg_table_descriptors)
+		& L1_COARSE_DESCRIPTOR_ADDR_MASK);
+
+	if (CACHE_S(info) && (CACHE_DSIZE(info) & (1 << 11))) {
+		dprintk(KERN_DEBUG "tf_get_l1_coarse_descriptor "
+			"V31-12 added to descriptor\n");
+		/* the 16k alignment restriction applies */
+		descriptor |= (DESCRIPTOR_V13_12_GET(
+			(u32)coarse_pg_table_descriptors) <<
+				L1_COARSE_DESCRIPTOR_V13_12_SHIFT);
+	}
+
+	return descriptor;
+}
+
+
+#define dprintk_desc(...)
+/*
+ * Returns the L2 descriptor for the specified user page.
+ */
+u32 tf_get_l2_descriptor_common(u32 vaddr, struct mm_struct *mm)
+{
+	pgd_t *pgd;
+	pud_t *pud;
+	pmd_t *pmd;
+	pte_t *ptep;
+	u32  *hwpte;
+	u32   tex = 0;
+	u32 descriptor = 0;
+
+	dprintk_desc(KERN_INFO "VirtAddr = %x\n", vaddr);
+	pgd = pgd_offset(mm, vaddr);
+	dprintk_desc(KERN_INFO "pgd = %x, value=%x\n", (unsigned int) pgd,
+		(unsigned int) *pgd);
+	if (pgd_none(*pgd))
+		goto error;
+	pud = pud_offset(pgd, vaddr);
+	dprintk_desc(KERN_INFO "pud = %x, value=%x\n", (unsigned int) pud,
+		(unsigned int) *pud);
+	if (pud_none(*pud))
+		goto error;
+	pmd = pmd_offset(pud, vaddr);
+	dprintk_desc(KERN_INFO "pmd = %x, value=%x\n", (unsigned int) pmd,
+		(unsigned int) *pmd);
+	if (pmd_none(*pmd))
+		goto error;
+
+	if (PMD_TYPE_SECT&(*pmd)) {
+		/* We have a section */
+		dprintk_desc(KERN_INFO "Section descr=%x\n",
+			(unsigned int)*pmd);
+		if ((*pmd) & PMD_SECT_BUFFERABLE)
+			descriptor |= DESCRIPTOR_B_MASK;
+		if ((*pmd) & PMD_SECT_CACHEABLE)
+			descriptor |= DESCRIPTOR_C_MASK;
+		if ((*pmd) & PMD_SECT_S)
+			descriptor |= DESCRIPTOR_S_MASK;
+		tex = ((*pmd) >> 12) & 7;
+	} else {
+		/* We have a table */
+		ptep = pte_offset_map(pmd, vaddr);
+		if (pte_present(*ptep)) {
+			dprintk_desc(KERN_INFO "L2 descr=%x\n",
+				(unsigned int) *ptep);
+			if ((*ptep) & L_PTE_MT_BUFFERABLE)
+				descriptor |= DESCRIPTOR_B_MASK;
+			if ((*ptep) & L_PTE_MT_WRITETHROUGH)
+				descriptor |= DESCRIPTOR_C_MASK;
+			if ((*ptep) & L_PTE_MT_DEV_SHARED)
+				descriptor |= DESCRIPTOR_S_MASK;
+
+			/*
+			 * Linux's pte doesn't keep track of TEX value.
+			 * Have to jump to hwpte see include/asm/pgtable.h
+			 * (-2k before 2.6.38, then +2k)
+			 */
+#ifdef PTE_HWTABLE_SIZE
+			hwpte = (u32 *) (ptep+PTE_HWTABLE_PTRS);
+#else
+			hwpte = (u32 *) (ptep-PTRS_PER_PTE);
+#endif
+			if (((*hwpte) & L2_DESCRIPTOR_ADDR_MASK) !=
+					((*ptep) & L2_DESCRIPTOR_ADDR_MASK))
+				goto error;
+			dprintk_desc(KERN_INFO "hw descr=%x\n", *hwpte);
+			tex = ((*hwpte) >> 6) & 7;
+			pte_unmap(ptep);
+		} else {
+			pte_unmap(ptep);
+			goto error;
+		}
+	}
+
+	descriptor |= (tex << 6);
+
+	return descriptor;
+
+error:
+	dprintk(KERN_ERR "Error occured in %s\n", __func__);
+	return 0;
+}
+
+
+/*
+ * Changes an L2 page descriptor back to a pointer to a physical page
+ */
+inline struct page *tf_l2_page_descriptor_to_page(u32 l2_page_descriptor)
+{
+	return pte_page(l2_page_descriptor & L2_DESCRIPTOR_ADDR_MASK);
+}
+
+
+/*
+ * Returns the L1 descriptor for the 1KB-aligned coarse page table. The address
+ * must be in the kernel address space.
+ */
+static void tf_get_l2_page_descriptor(
+	u32 *l2_page_descriptor,
+	u32 flags, struct mm_struct *mm)
+{
+	unsigned long page_vaddr;
+	u32 descriptor;
+	struct page *page;
+	bool unmap_page = false;
+
+#if 0
+	dprintk(KERN_INFO
+		"tf_get_l2_page_descriptor():"
+		"*l2_page_descriptor=%x\n",
+		*l2_page_descriptor);
+#endif
+
+	if (*l2_page_descriptor == L2_DESCRIPTOR_FAULT)
+		return;
+
+	page = (struct page *) (*l2_page_descriptor);
+
+	page_vaddr = (unsigned long) page_address(page);
+	if (page_vaddr == 0) {
+		dprintk(KERN_INFO "page_address returned 0\n");
+		/* Should we use kmap_atomic(page, KM_USER0) instead ? */
+		page_vaddr = (unsigned long) kmap(page);
+		if (page_vaddr == 0) {
+			*l2_page_descriptor = L2_DESCRIPTOR_FAULT;
+			dprintk(KERN_ERR "kmap returned 0\n");
+			return;
+		}
+		unmap_page = true;
+	}
+
+	descriptor = tf_get_l2_descriptor_common(page_vaddr, mm);
+	if (descriptor == 0) {
+		*l2_page_descriptor = L2_DESCRIPTOR_FAULT;
+		return;
+	}
+	descriptor |= L2_PAGE_DESCRIPTOR_BASE;
+
+	descriptor |= (page_to_phys(page) & L2_DESCRIPTOR_ADDR_MASK);
+
+	if (!(flags & TF_SHMEM_TYPE_WRITE))
+		/* only read access */
+		descriptor |= L2_PAGE_DESCRIPTOR_AP_APX_READ;
+	else
+		/* read and write access */
+		descriptor |= L2_PAGE_DESCRIPTOR_AP_APX_READ_WRITE;
+
+	if (unmap_page)
+		kunmap(page);
+
+	*l2_page_descriptor = descriptor;
+}
+
+
+/*
+ * Unlocks the physical memory pages
+ * and frees the coarse pages that need to
+ */
+void tf_cleanup_shared_memory(
+	struct tf_coarse_page_table_allocation_context *alloc_context,
+	struct tf_shmem_desc *shmem_desc,
+	u32 full_cleanup)
+{
+	u32 coarse_page_index;
+
+	dprintk(KERN_INFO "tf_cleanup_shared_memory(%p)\n",
+			shmem_desc);
+
+#ifdef DEBUG_COARSE_TABLES
+	printk(KERN_DEBUG "tf_cleanup_shared_memory "
+		"- number of coarse page tables=%d\n",
+		shmem_desc->coarse_pg_table_count);
+
+	for (coarse_page_index = 0;
+	     coarse_page_index < shmem_desc->coarse_pg_table_count;
+	     coarse_page_index++) {
+		u32 j;
+
+		printk(KERN_DEBUG "  Descriptor=%p address=%p index=%d\n",
+			shmem_desc->coarse_pg_table[coarse_page_index],
+			shmem_desc->coarse_pg_table[coarse_page_index]->
+				descriptors,
+			coarse_page_index);
+		if (shmem_desc->coarse_pg_table[coarse_page_index] != NULL) {
+			for (j = 0;
+			     j < TF_DESCRIPTOR_TABLE_CAPACITY;
+			     j += 8) {
+				int k;
+				printk(KERN_DEBUG "    ");
+				for (k = j; k < j + 8; k++)
+					printk(KERN_DEBUG "%p ",
+						shmem_desc->coarse_pg_table[
+							coarse_page_index]->
+								descriptors);
+				printk(KERN_DEBUG "\n");
+			}
+		}
+	}
+	printk(KERN_DEBUG "tf_cleanup_shared_memory() - done\n\n");
+#endif
+
+	/* Parse the coarse page descriptors */
+	for (coarse_page_index = 0;
+	     coarse_page_index < shmem_desc->coarse_pg_table_count;
+	     coarse_page_index++) {
+		u32 j;
+		u32 found = 0;
+
+		/* parse the page descriptors of the coarse page */
+		for (j = 0; j < TF_DESCRIPTOR_TABLE_CAPACITY; j++) {
+			u32 l2_page_descriptor = (u32) (shmem_desc->
+				coarse_pg_table[coarse_page_index]->
+					descriptors[j]);
+
+			if (l2_page_descriptor != L2_DESCRIPTOR_FAULT) {
+				struct page *page =
+					tf_l2_page_descriptor_to_page(
+						l2_page_descriptor);
+
+				if (!PageReserved(page))
+					SetPageDirty(page);
+				internal_page_cache_release(page);
+
+				found = 1;
+			} else if (found == 1) {
+				break;
+			}
+		}
+
+		/*
+		 * Only free the coarse pages of descriptors not preallocated
+		 */
+		if ((shmem_desc->type == TF_SHMEM_TYPE_REGISTERED_SHMEM) ||
+			(full_cleanup != 0))
+			tf_free_coarse_page_table(alloc_context,
+				shmem_desc->coarse_pg_table[coarse_page_index],
+				0);
+	}
+
+	shmem_desc->coarse_pg_table_count = 0;
+	dprintk(KERN_INFO "tf_cleanup_shared_memory(%p) done\n",
+			shmem_desc);
+}
+
+/*
+ * Make sure the coarse pages are allocated. If not allocated, do it.
+ * Locks down the physical memory pages.
+ * Verifies the memory attributes depending on flags.
+ */
+int tf_fill_descriptor_table(
+	struct tf_coarse_page_table_allocation_context *alloc_context,
+	struct tf_shmem_desc *shmem_desc,
+	u32 buffer,
+	struct vm_area_struct **vmas,
+	u32 descriptors[TF_MAX_COARSE_PAGES],
+	u32 buffer_size,
+	u32 *buffer_start_offset,
+	bool in_user_space,
+	u32 flags,
+	u32 *descriptor_count)
+{
+	u32 coarse_page_index;
+	u32 coarse_page_count;
+	u32 page_count;
+	u32 page_shift = 0;
+	int ret = 0;
+	unsigned int info = read_cpuid(CPUID_CACHETYPE);
+
+	dprintk(KERN_INFO "tf_fill_descriptor_table"
+		"(%p, buffer=0x%08X, size=0x%08X, user=%01x "
+		"flags = 0x%08x)\n",
+		shmem_desc,
+		buffer,
+		buffer_size,
+		in_user_space,
+		flags);
+
+	/*
+	 * Compute the number of pages
+	 * Compute the number of coarse pages
+	 * Compute the page offset
+	 */
+	page_count = ((buffer & ~PAGE_MASK) +
+		buffer_size + ~PAGE_MASK) >> PAGE_SHIFT;
+
+	/* check whether the 16k alignment restriction applies */
+	if (CACHE_S(info) && (CACHE_DSIZE(info) & (1 << 11)))
+		/*
+		 * The 16k alignment restriction applies.
+		 * Shift data to get them 16k aligned
+		 */
+		page_shift = DESCRIPTOR_V13_12_GET(buffer);
+	page_count += page_shift;
+
+
+	/*
+	 * Check the number of pages fit in the coarse pages
+	 */
+	if (page_count > (TF_DESCRIPTOR_TABLE_CAPACITY *
+			TF_MAX_COARSE_PAGES)) {
+		dprintk(KERN_ERR "tf_fill_descriptor_table(%p): "
+			"%u pages required to map shared memory!\n",
+			shmem_desc, page_count);
+		ret = -ENOMEM;
+		goto error;
+	}
+
+	/* coarse page describe 256 pages */
+	coarse_page_count = ((page_count +
+		TF_DESCRIPTOR_TABLE_CAPACITY_MASK) >>
+			TF_DESCRIPTOR_TABLE_CAPACITY_BIT_SHIFT);
+
+	/*
+	 * Compute the buffer offset
+	 */
+	*buffer_start_offset = (buffer & ~PAGE_MASK) |
+		(page_shift << PAGE_SHIFT);
+
+	/* map each coarse page */
+	for (coarse_page_index = 0;
+	     coarse_page_index < coarse_page_count;
+	     coarse_page_index++) {
+		u32 j;
+		struct tf_coarse_page_table *coarse_pg_table;
+
+		/* compute a virtual address with appropriate offset */
+		u32 buffer_offset_vaddr = buffer +
+			(coarse_page_index * TF_MAX_COARSE_PAGE_MAPPED_SIZE);
+		u32 pages_to_get;
+
+		/*
+		 * Compute the number of pages left for this coarse page.
+		 * Decrement page_count each time
+		 */
+		pages_to_get = (page_count >>
+			TF_DESCRIPTOR_TABLE_CAPACITY_BIT_SHIFT) ?
+				TF_DESCRIPTOR_TABLE_CAPACITY : page_count;
+		page_count -= pages_to_get;
+
+		/*
+		 * Check if the coarse page has already been allocated
+		 * If not, do it now
+		 */
+		if ((shmem_desc->type == TF_SHMEM_TYPE_REGISTERED_SHMEM)
+			|| (shmem_desc->type ==
+				TF_SHMEM_TYPE_PM_HIBERNATE)) {
+			coarse_pg_table = tf_alloc_coarse_page_table(
+				alloc_context,
+				TF_PAGE_DESCRIPTOR_TYPE_NORMAL);
+
+			if (coarse_pg_table == NULL) {
+				dprintk(KERN_ERR
+					"tf_fill_descriptor_table(%p): "
+					"tf_alloc_coarse_page_table "
+					"failed for coarse page %d\n",
+					shmem_desc, coarse_page_index);
+				ret = -ENOMEM;
+				goto error;
+			}
+
+			shmem_desc->coarse_pg_table[coarse_page_index] =
+				coarse_pg_table;
+		} else {
+			coarse_pg_table =
+				shmem_desc->coarse_pg_table[coarse_page_index];
+		}
+
+		/*
+		 * The page is not necessarily filled with zeroes.
+		 * Set the fault descriptors ( each descriptor is 4 bytes long)
+		 */
+		memset(coarse_pg_table->descriptors, 0x00,
+			TF_DESCRIPTOR_TABLE_CAPACITY * sizeof(u32));
+
+		if (in_user_space) {
+			int pages;
+
+			/*
+			 * TRICK: use pCoarsePageDescriptor->descriptors to
+			 * hold the (struct page*) items before getting their
+			 * physical address
+			 */
+			down_read(&(current->mm->mmap_sem));
+			pages = internal_get_user_pages(
+				current,
+				current->mm,
+				buffer_offset_vaddr,
+				/*
+				 * page_shift is cleared after retrieving first
+				 * coarse page
+				 */
+				(pages_to_get - page_shift),
+				(flags & TF_SHMEM_TYPE_WRITE) ? 1 : 0,
+				0,
+				(struct page **) (coarse_pg_table->descriptors
+					+ page_shift),
+				vmas);
+			up_read(&(current->mm->mmap_sem));
+
+			if ((pages <= 0) ||
+				(pages != (pages_to_get - page_shift))) {
+				dprintk(KERN_ERR "tf_fill_descriptor_table:"
+					" get_user_pages got %d pages while "
+					"trying to get %d pages!\n",
+					pages, pages_to_get - page_shift);
+				ret = -EFAULT;
+				goto error;
+			}
+
+			for (j = page_shift;
+				  j < page_shift + pages;
+				  j++) {
+				/* Get the actual L2 descriptors */
+				tf_get_l2_page_descriptor(
+					&coarse_pg_table->descriptors[j],
+					flags,
+					current->mm);
+				/*
+				 * Reject Strongly-Ordered or Device Memory
+				 */
+#define IS_STRONGLY_ORDERED_OR_DEVICE_MEM(x) \
+	((((x) & L2_TEX_C_B_MASK) == L2_TEX_C_B_STRONGLY_ORDERED) || \
+	 (((x) & L2_TEX_C_B_MASK) == L2_TEX_C_B_SHARED_DEVICE) || \
+	 (((x) & L2_TEX_C_B_MASK) == L2_TEX_C_B_NON_SHARED_DEVICE))
+
+				if (IS_STRONGLY_ORDERED_OR_DEVICE_MEM(
+					coarse_pg_table->
+						descriptors[j])) {
+					dprintk(KERN_ERR
+						"tf_fill_descriptor_table:"
+						" descriptor 0x%08X use "
+						"strongly-ordered or device "
+						"memory. Rejecting!\n",
+						coarse_pg_table->
+							descriptors[j]);
+					ret = -EFAULT;
+					goto error;
+				}
+			}
+		} else if (is_vmalloc_addr((void *)buffer_offset_vaddr)) {
+			/* Kernel-space memory obtained through vmalloc */
+			dprintk(KERN_INFO
+				"tf_fill_descriptor_table: "
+				"vmalloc'ed buffer starting at %p\n",
+			       (void *)buffer_offset_vaddr);
+			for (j = page_shift; j < pages_to_get; j++) {
+				struct page *page;
+				void *addr =
+					(void *)(buffer_offset_vaddr +
+						(j - page_shift) * PAGE_SIZE);
+				page = vmalloc_to_page(addr);
+				if (page == NULL) {
+					dprintk(KERN_ERR
+						"tf_fill_descriptor_table: "
+						"cannot map %p (vmalloc) "
+						"to page\n",
+						addr);
+					ret = -EFAULT;
+					goto error;
+				}
+				coarse_pg_table->descriptors[j] = (u32)page;
+				get_page(page);
+
+				/* change coarse page "page address" */
+				tf_get_l2_page_descriptor(
+					&coarse_pg_table->descriptors[j],
+					flags,
+					&init_mm);
+			}
+		} else {
+			/* Kernel-space memory given by a virtual address */
+			dprintk(KERN_INFO
+				"tf_fill_descriptor_table: "
+				"buffer starting at virtual address %p\n",
+			       (void *)buffer_offset_vaddr);
+			for (j = page_shift; j < pages_to_get; j++) {
+				struct page *page;
+				void *addr =
+					(void *)(buffer_offset_vaddr +
+						(j - page_shift) * PAGE_SIZE);
+				page = virt_to_page(addr);
+				if (page == NULL) {
+					dprintk(KERN_ERR
+						"tf_fill_descriptor_table: "
+						"cannot map %p (virtual) "
+						"to page\n",
+						addr);
+					ret = -EFAULT;
+					goto error;
+				}
+				coarse_pg_table->descriptors[j] = (u32)page;
+				get_page(page);
+
+				/* change coarse page "page address" */
+				tf_get_l2_page_descriptor(
+					&coarse_pg_table->descriptors[j],
+					flags,
+					&init_mm);
+			}
+		}
+
+		dmac_flush_range((void *)coarse_pg_table->descriptors,
+		   (void *)(((u32)(coarse_pg_table->descriptors)) +
+		   TF_DESCRIPTOR_TABLE_CAPACITY * sizeof(u32)));
+
+		outer_clean_range(
+			__pa(coarse_pg_table->descriptors),
+			__pa(coarse_pg_table->descriptors) +
+			TF_DESCRIPTOR_TABLE_CAPACITY * sizeof(u32));
+		wmb();
+
+		/* Update the coarse page table address */
+		descriptors[coarse_page_index] =
+			tf_get_l1_coarse_descriptor(
+				coarse_pg_table->descriptors);
+
+		/*
+		 * The next coarse page has no page shift, reset the
+		 * page_shift
+		 */
+		page_shift = 0;
+	}
+
+	*descriptor_count = coarse_page_count;
+	shmem_desc->coarse_pg_table_count = coarse_page_count;
+
+#ifdef DEBUG_COARSE_TABLES
+	printk(KERN_DEBUG "ntf_fill_descriptor_table - size=0x%08X "
+		"numberOfCoarsePages=%d\n", buffer_size,
+		shmem_desc->coarse_pg_table_count);
+	for (coarse_page_index = 0;
+	     coarse_page_index < shmem_desc->coarse_pg_table_count;
+	     coarse_page_index++) {
+		u32 j;
+		struct tf_coarse_page_table *coarse_page_table =
+			shmem_desc->coarse_pg_table[coarse_page_index];
+
+		printk(KERN_DEBUG "  Descriptor=%p address=%p index=%d\n",
+			coarse_page_table,
+			coarse_page_table->descriptors,
+			coarse_page_index);
+		for (j = 0;
+		     j < TF_DESCRIPTOR_TABLE_CAPACITY;
+		     j += 8) {
+			int k;
+			printk(KERN_DEBUG "    ");
+			for (k = j; k < j + 8; k++)
+				printk(KERN_DEBUG "0x%08X ",
+					coarse_page_table->descriptors[k]);
+			printk(KERN_DEBUG "\n");
+		}
+	}
+	printk(KERN_DEBUG "ntf_fill_descriptor_table() - done\n\n");
+#endif
+
+	return 0;
+
+error:
+	tf_cleanup_shared_memory(
+			alloc_context,
+			shmem_desc,
+			0);
+
+	return ret;
+}
+
+
+/*----------------------------------------------------------------------------
+ * Standard communication operations
+ *----------------------------------------------------------------------------*/
+
+u8 *tf_get_description(struct tf_comm *comm)
+{
+	if (test_bit(TF_COMM_FLAG_L1_SHARED_ALLOCATED, &(comm->flags)))
+		return comm->l1_buffer->version_description;
+
+	return NULL;
+}
+
+/*
+ * Returns a non-zero value if the specified S-timeout has expired, zero
+ * otherwise.
+ *
+ * The placeholder referenced to by relative_timeout_jiffies gives the relative
+ * timeout from now in jiffies. It is set to zero if the S-timeout has expired,
+ * or to MAX_SCHEDULE_TIMEOUT if the S-timeout is infinite.
+ */
+static int tf_test_s_timeout(
+		u64 timeout,
+		signed long *relative_timeout_jiffies)
+{
+	struct timeval now;
+	u64 time64;
+
+	*relative_timeout_jiffies = 0;
+
+	/* immediate timeout */
+	if (timeout == TIME_IMMEDIATE)
+		return 1;
+
+	/* infinite timeout */
+	if (timeout == TIME_INFINITE) {
+		dprintk(KERN_DEBUG "tf_test_s_timeout: "
+			"timeout is infinite\n");
+		*relative_timeout_jiffies = MAX_SCHEDULE_TIMEOUT;
+		return 0;
+	}
+
+	do_gettimeofday(&now);
+	time64 = now.tv_sec;
+	/* will not overflow as operations are done on 64bit values */
+	time64 = (time64 * 1000) + (now.tv_usec / 1000);
+
+	/* timeout expired */
+	if (time64 >= timeout) {
+		dprintk(KERN_DEBUG "tf_test_s_timeout: timeout expired\n");
+		return 1;
+	}
+
+	/*
+	 * finite timeout, compute relative_timeout_jiffies
+	 */
+	/* will not overflow as time64 < timeout */
+	timeout -= time64;
+
+	/* guarantee *relative_timeout_jiffies is a valid timeout */
+	if ((timeout >> 32) != 0)
+		*relative_timeout_jiffies = MAX_JIFFY_OFFSET;
+	else
+		*relative_timeout_jiffies =
+			msecs_to_jiffies((unsigned int) timeout);
+
+	dprintk(KERN_DEBUG "tf_test_s_timeout: timeout is 0x%lx\n",
+		*relative_timeout_jiffies);
+	return 0;
+}
+
+static void tf_copy_answers(struct tf_comm *comm)
+{
+	u32 first_answer;
+	u32 first_free_answer;
+	struct tf_answer_struct *answerStructureTemp;
+
+	if (test_bit(TF_COMM_FLAG_L1_SHARED_ALLOCATED, &(comm->flags))) {
+		spin_lock(&comm->lock);
+		first_free_answer = tf_read_reg32(
+			&comm->l1_buffer->first_free_answer);
+		first_answer = tf_read_reg32(
+			&comm->l1_buffer->first_answer);
+
+		while (first_answer != first_free_answer) {
+			/* answer queue not empty */
+			union tf_answer sComAnswer;
+			struct tf_answer_header  header;
+
+			/*
+			 * the size of the command in words of 32bit, not in
+			 * bytes
+			 */
+			u32 command_size;
+			u32 i;
+			u32 *temp = (uint32_t *) &header;
+
+			dprintk(KERN_INFO
+				"[pid=%d] tf_copy_answers(%p): "
+				"Read answers from L1\n",
+				current->pid, comm);
+
+			/* Read the answer header */
+			for (i = 0;
+			     i < sizeof(struct tf_answer_header)/sizeof(u32);
+			       i++)
+				temp[i] = comm->l1_buffer->answer_queue[
+					(first_answer + i) %
+						TF_S_ANSWER_QUEUE_CAPACITY];
+
+			/* Read the answer from the L1_Buffer*/
+			command_size = header.message_size +
+				sizeof(struct tf_answer_header)/sizeof(u32);
+			temp = (uint32_t *) &sComAnswer;
+			for (i = 0; i < command_size; i++)
+				temp[i] = comm->l1_buffer->answer_queue[
+					(first_answer + i) %
+						TF_S_ANSWER_QUEUE_CAPACITY];
+
+			answerStructureTemp = (struct tf_answer_struct *)
+				sComAnswer.header.operation_id;
+
+			tf_dump_answer(&sComAnswer);
+
+			memcpy(answerStructureTemp->answer, &sComAnswer,
+				command_size * sizeof(u32));
+			answerStructureTemp->answer_copied = true;
+
+			first_answer += command_size;
+			tf_write_reg32(&comm->l1_buffer->first_answer,
+				first_answer);
+		}
+		spin_unlock(&(comm->lock));
+	}
+}
+
+static void tf_copy_command(
+	struct tf_comm *comm,
+	union tf_command *command,
+	struct tf_connection *connection,
+	enum TF_COMMAND_STATE *command_status)
+{
+	if ((test_bit(TF_COMM_FLAG_L1_SHARED_ALLOCATED, &(comm->flags)))
+		&& (command != NULL)) {
+		/*
+		 * Write the message in the message queue.
+		 */
+
+		if (*command_status == TF_COMMAND_STATE_PENDING) {
+			u32 command_size;
+			u32 queue_words_count;
+			u32 i;
+			u32 first_free_command;
+			u32 first_command;
+
+			spin_lock(&comm->lock);
+
+			first_command = tf_read_reg32(
+				&comm->l1_buffer->first_command);
+			first_free_command = tf_read_reg32(
+				&comm->l1_buffer->first_free_command);
+
+			queue_words_count = first_free_command - first_command;
+			command_size     = command->header.message_size +
+				sizeof(struct tf_command_header)/sizeof(u32);
+			if ((queue_words_count + command_size) <
+				TF_N_MESSAGE_QUEUE_CAPACITY) {
+				/*
+				* Command queue is not full.
+				* If the Command queue is full,
+				* the command will be copied at
+				* another iteration
+				* of the current function.
+				*/
+
+				/*
+				* Change the conn state
+				*/
+				if (connection == NULL)
+					goto copy;
+
+				spin_lock(&(connection->state_lock));
+
+				if ((connection->state ==
+				TF_CONN_STATE_NO_DEVICE_CONTEXT)
+				&&
+				(command->header.message_type ==
+				TF_MESSAGE_TYPE_CREATE_DEVICE_CONTEXT)) {
+
+					dprintk(KERN_INFO
+				"tf_copy_command(%p):"
+				"Conn state is DEVICE_CONTEXT_SENT\n",
+				 connection);
+					connection->state =
+			TF_CONN_STATE_CREATE_DEVICE_CONTEXT_SENT;
+				} else if ((connection->state !=
+				TF_CONN_STATE_VALID_DEVICE_CONTEXT)
+				&&
+				(command->header.message_type !=
+				TF_MESSAGE_TYPE_CREATE_DEVICE_CONTEXT)) {
+					/* The connection
+					* is no longer valid.
+					* We may not send any command on it,
+					* not even another
+					* DESTROY_DEVICE_CONTEXT.
+					*/
+					dprintk(KERN_INFO
+						"[pid=%d] tf_copy_command(%p): "
+						"Connection no longer valid."
+						"ABORT\n",
+						current->pid, connection);
+					*command_status =
+						TF_COMMAND_STATE_ABORTED;
+					spin_unlock(
+						&(connection->state_lock));
+					spin_unlock(
+						&comm->lock);
+					return;
+				} else if (
+					(command->header.message_type ==
+				TF_MESSAGE_TYPE_DESTROY_DEVICE_CONTEXT) &&
+				(connection->state ==
+				TF_CONN_STATE_VALID_DEVICE_CONTEXT)
+						) {
+					dprintk(KERN_INFO
+					"[pid=%d] tf_copy_command(%p): "
+					"Conn state is "
+					"DESTROY_DEVICE_CONTEXT_SENT\n",
+					current->pid, connection);
+					connection->state =
+			TF_CONN_STATE_DESTROY_DEVICE_CONTEXT_SENT;
+					}
+					spin_unlock(&(connection->state_lock));
+copy:
+					/*
+					* Copy the command to L1 Buffer
+					*/
+					dprintk(KERN_INFO
+				"[pid=%d] tf_copy_command(%p): "
+				"Write Message in the queue\n",
+				current->pid, command);
+					tf_dump_command(command);
+
+					for (i = 0; i < command_size; i++)
+						comm->l1_buffer->command_queue[
+						(first_free_command + i) %
+						TF_N_MESSAGE_QUEUE_CAPACITY] =
+						((uint32_t *) command)[i];
+
+					*command_status =
+						TF_COMMAND_STATE_SENT;
+					first_free_command += command_size;
+
+					tf_write_reg32(
+						&comm->
+						l1_buffer->first_free_command,
+						first_free_command);
+			}
+			spin_unlock(&comm->lock);
+		}
+	}
+}
+
+/*
+ * Sends the specified message through the specified communication channel.
+ *
+ * This function sends the command and waits for the answer
+ *
+ * Returns zero upon successful completion, or an appropriate error code upon
+ * failure.
+ */
+static int tf_send_recv(struct tf_comm *comm,
+	union tf_command *command,
+	struct tf_answer_struct *answerStruct,
+	struct tf_connection *connection,
+	int bKillable
+	)
+{
+	int result;
+	u64 timeout;
+	signed long nRelativeTimeoutJiffies;
+	bool wait_prepared = false;
+	enum TF_COMMAND_STATE command_status = TF_COMMAND_STATE_PENDING;
+	DEFINE_WAIT(wait);
+#ifdef CONFIG_FREEZER
+	unsigned long saved_flags;
+#endif
+	dprintk(KERN_INFO "[pid=%d] tf_send_recv(%p)\n",
+		 current->pid, command);
+
+#ifdef CONFIG_TF_ZEBRA
+	tf_clock_timer_start();
+#endif
+
+#ifdef CONFIG_FREEZER
+	saved_flags = current->flags;
+	current->flags |= PF_FREEZER_NOSIG;
+#endif
+
+	/*
+	 * Read all answers from the answer queue
+	 */
+copy_answers:
+	tf_copy_answers(comm);
+
+	tf_copy_command(comm, command, connection, &command_status);
+
+	/*
+	 * Notify all waiting threads
+	 */
+	wake_up(&(comm->wait_queue));
+
+#ifdef CONFIG_FREEZER
+	if (unlikely(freezing(current))) {
+
+		dprintk(KERN_INFO
+			"Entering refrigerator.\n");
+		refrigerator();
+		dprintk(KERN_INFO
+			"Left refrigerator.\n");
+		goto copy_answers;
+	}
+#endif
+
+#ifndef CONFIG_PREEMPT
+	if (need_resched())
+		schedule();
+#endif
+
+#ifdef CONFIG_TF_ZEBRA
+	/*
+	 * Handle RPC (if any)
+	 */
+	if (tf_rpc_execute(comm) == RPC_NON_YIELD)
+		goto schedule_secure_world;
+#endif
+
+	/*
+	 * Join wait queue
+	 */
+	/*dprintk(KERN_INFO "[pid=%d] tf_send_recv(%p): Prepare to wait\n",
+		current->pid, command);*/
+	prepare_to_wait(&comm->wait_queue, &wait,
+			bKillable ? TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE);
+	wait_prepared = true;
+
+	/*
+	 * Check if our answer is available
+	 */
+	if (command_status == TF_COMMAND_STATE_ABORTED) {
+		/* Not waiting for an answer, return error code */
+		result = -EINTR;
+		dprintk(KERN_ERR "[pid=%d] tf_send_recv: "
+			"Command status is ABORTED."
+			"Exit with 0x%x\n",
+			current->pid, result);
+		goto exit;
+	}
+	if (answerStruct->answer_copied) {
+		dprintk(KERN_INFO "[pid=%d] tf_send_recv: "
+			"Received answer (type 0x%02X)\n",
+			current->pid,
+			answerStruct->answer->header.message_type);
+		result = 0;
+		goto exit;
+	}
+
+	/*
+	 * Check if a signal is pending
+	 */
+	if (bKillable && (sigkill_pending())) {
+		if (command_status == TF_COMMAND_STATE_PENDING)
+			/*Command was not sent. */
+			result = -EINTR;
+		else
+			/* Command was sent but no answer was received yet. */
+			result = -EIO;
+
+		dprintk(KERN_ERR "[pid=%d] tf_send_recv: "
+			"Signal Pending. Return error %d\n",
+			current->pid, result);
+		goto exit;
+	}
+
+	/*
+	 * Check if secure world is schedulable. It is schedulable if at
+	 * least one of the following conditions holds:
+	 * + it is still initializing (TF_COMM_FLAG_L1_SHARED_ALLOCATED
+	 *   is not set);
+	 * + there is a command in the queue;
+	 * + the secure world timeout is zero.
+	 */
+	if (test_bit(TF_COMM_FLAG_L1_SHARED_ALLOCATED, &(comm->flags))) {
+		u32 first_free_command;
+		u32 first_command;
+		spin_lock(&comm->lock);
+		first_command = tf_read_reg32(
+			&comm->l1_buffer->first_command);
+		first_free_command = tf_read_reg32(
+			&comm->l1_buffer->first_free_command);
+		spin_unlock(&comm->lock);
+		tf_read_timeout(comm, &timeout);
+		if ((first_free_command == first_command) &&
+			 (tf_test_s_timeout(timeout,
+			&nRelativeTimeoutJiffies) == 0))
+			/*
+			 * If command queue is empty and if timeout has not
+			 * expired secure world is not schedulable
+			 */
+			goto wait;
+	}
+
+	finish_wait(&comm->wait_queue, &wait);
+	wait_prepared = false;
+
+	/*
+	 * Yield to the Secure World
+	 */
+#ifdef CONFIG_TF_ZEBRA
+schedule_secure_world:
+#endif
+
+	result = tf_schedule_secure_world(comm);
+	if (result < 0)
+		goto exit;
+	goto copy_answers;
+
+wait:
+	if (bKillable && (sigkill_pending())) {
+		if (command_status == TF_COMMAND_STATE_PENDING)
+			result = -EINTR; /* Command was not sent. */
+		else
+			/* Command was sent but no answer was received yet. */
+			result = -EIO;
+
+		dprintk(KERN_ERR "[pid=%d] tf_send_recv: "
+			"Signal Pending while waiting. Return error %d\n",
+			current->pid, result);
+		goto exit;
+	}
+
+	if (nRelativeTimeoutJiffies == MAX_SCHEDULE_TIMEOUT)
+		dprintk(KERN_INFO "[pid=%d] tf_send_recv: "
+			"prepare to sleep infinitely\n", current->pid);
+	else
+		dprintk(KERN_INFO "tf_send_recv: "
+			"prepare to sleep 0x%lx jiffies\n",
+			nRelativeTimeoutJiffies);
+
+	/* go to sleep */
+	if (schedule_timeout(nRelativeTimeoutJiffies) == 0)
+		dprintk(KERN_INFO
+			"tf_send_recv: timeout expired\n");
+	else
+		dprintk(KERN_INFO
+			"tf_send_recv: signal delivered\n");
+
+	finish_wait(&comm->wait_queue, &wait);
+	wait_prepared = false;
+	goto copy_answers;
+
+exit:
+	if (wait_prepared) {
+		finish_wait(&comm->wait_queue, &wait);
+		wait_prepared = false;
+	}
+
+#ifdef CONFIG_FREEZER
+	current->flags &= ~(PF_FREEZER_NOSIG);
+	current->flags |= (saved_flags & PF_FREEZER_NOSIG);
+#endif
+
+	return result;
+}
+
+/*
+ * Sends the specified message through the specified communication channel.
+ *
+ * This function sends the message and waits for the corresponding answer
+ * It may return if a signal needs to be delivered.
+ *
+ * Returns zero upon successful completion, or an appropriate error code upon
+ * failure.
+ */
+int tf_send_receive(struct tf_comm *comm,
+	  union tf_command *command,
+	  union tf_answer *answer,
+	  struct tf_connection *connection,
+	  bool bKillable)
+{
+	int error;
+	struct tf_answer_struct answerStructure;
+#ifdef CONFIG_SMP
+	long ret_affinity;
+	cpumask_t saved_cpu_mask;
+	cpumask_t local_cpu_mask = CPU_MASK_NONE;
+#endif
+
+	answerStructure.answer = answer;
+	answerStructure.answer_copied = false;
+
+	if (command != NULL)
+		command->header.operation_id = (u32) &answerStructure;
+
+	dprintk(KERN_INFO "tf_send_receive\n");
+
+#ifdef CONFIG_TF_ZEBRA
+	if (!test_bit(TF_COMM_FLAG_PA_AVAILABLE, &comm->flags)) {
+		dprintk(KERN_ERR "tf_send_receive(%p): "
+			"Secure world not started\n", comm);
+
+		return -EFAULT;
+	}
+#endif
+
+	if (test_bit(TF_COMM_FLAG_TERMINATING, &(comm->flags)) != 0) {
+		dprintk(KERN_DEBUG
+			"tf_send_receive: Flag Terminating is set\n");
+		return 0;
+	}
+
+#ifdef CONFIG_SMP
+	cpu_set(0, local_cpu_mask);
+	sched_getaffinity(0, &saved_cpu_mask);
+	ret_affinity = sched_setaffinity(0, &local_cpu_mask);
+	if (ret_affinity != 0)
+		dprintk(KERN_ERR "sched_setaffinity #1 -> 0x%lX", ret_affinity);
+#endif
+
+
+	/*
+	 * Send the command
+	 */
+	error = tf_send_recv(comm,
+		command, &answerStructure, connection, bKillable);
+
+	if (!bKillable && sigkill_pending()) {
+		if ((command->header.message_type ==
+			TF_MESSAGE_TYPE_CREATE_DEVICE_CONTEXT) &&
+			(answer->create_device_context.error_code ==
+				S_SUCCESS)) {
+
+			/*
+			 * CREATE_DEVICE_CONTEXT was interrupted.
+			 */
+			dprintk(KERN_INFO "tf_send_receive: "
+				"sending DESTROY_DEVICE_CONTEXT\n");
+			answerStructure.answer =  answer;
+			answerStructure.answer_copied = false;
+
+			command->header.message_type =
+				TF_MESSAGE_TYPE_DESTROY_DEVICE_CONTEXT;
+			command->header.message_size =
+				(sizeof(struct
+					tf_command_destroy_device_context) -
+				 sizeof(struct tf_command_header))/sizeof(u32);
+			command->header.operation_id =
+				(u32) &answerStructure;
+			command->destroy_device_context.device_context =
+				answer->create_device_context.
+					device_context;
+
+			goto destroy_context;
+		}
+	}
+
+	if (error == 0) {
+		/*
+		 * tf_send_recv returned Success.
+		 */
+		if (command->header.message_type ==
+		TF_MESSAGE_TYPE_CREATE_DEVICE_CONTEXT) {
+			spin_lock(&(connection->state_lock));
+			connection->state = TF_CONN_STATE_VALID_DEVICE_CONTEXT;
+			spin_unlock(&(connection->state_lock));
+		} else if (command->header.message_type ==
+		TF_MESSAGE_TYPE_DESTROY_DEVICE_CONTEXT) {
+			spin_lock(&(connection->state_lock));
+			connection->state = TF_CONN_STATE_NO_DEVICE_CONTEXT;
+			spin_unlock(&(connection->state_lock));
+		}
+	} else if (error  == -EINTR) {
+		/*
+		* No command was sent, return failure.
+		*/
+		dprintk(KERN_ERR
+			"tf_send_receive: "
+			"tf_send_recv failed (error %d) !\n",
+			error);
+	} else if (error  == -EIO) {
+		/*
+		* A command was sent but its answer is still pending.
+		*/
+
+		/* means bKillable is true */
+		dprintk(KERN_ERR
+			"tf_send_receive: "
+			"tf_send_recv interrupted (error %d)."
+			"Send DESTROY_DEVICE_CONTEXT.\n", error);
+
+		/* Send the DESTROY_DEVICE_CONTEXT. */
+		answerStructure.answer =  answer;
+		answerStructure.answer_copied = false;
+
+		command->header.message_type =
+			TF_MESSAGE_TYPE_DESTROY_DEVICE_CONTEXT;
+		command->header.message_size =
+			(sizeof(struct tf_command_destroy_device_context) -
+				sizeof(struct tf_command_header))/sizeof(u32);
+		command->header.operation_id =
+			(u32) &answerStructure;
+		command->destroy_device_context.device_context =
+			connection->device_context;
+
+		error = tf_send_recv(comm,
+			command, &answerStructure, connection, false);
+		if (error == -EINTR) {
+			/*
+			* Another thread already sent
+			* DESTROY_DEVICE_CONTEXT.
+			* We must still wait for the answer
+			* to the original command.
+			*/
+			command = NULL;
+			goto destroy_context;
+		} else {
+			 /* An answer was received.
+			 * Check if it is the answer
+			 * to the DESTROY_DEVICE_CONTEXT.
+			 */
+			 spin_lock(&comm->lock);
+			 if (answer->header.message_type !=
+			 TF_MESSAGE_TYPE_DESTROY_DEVICE_CONTEXT) {
+				answerStructure.answer_copied = false;
+			 }
+			 spin_unlock(&comm->lock);
+			 if (!answerStructure.answer_copied) {
+				/* Answer to DESTROY_DEVICE_CONTEXT
+				* was not yet received.
+				* Wait for the answer.
+				*/
+				dprintk(KERN_INFO
+					"[pid=%d] tf_send_receive:"
+					"Answer to DESTROY_DEVICE_CONTEXT"
+					"not yet received.Retry\n",
+					current->pid);
+				command = NULL;
+				goto destroy_context;
+			 }
+		}
+	}
+
+	dprintk(KERN_INFO "tf_send_receive(): Message answer ready\n");
+	goto exit;
+
+destroy_context:
+	error = tf_send_recv(comm,
+	command, &answerStructure, connection, false);
+
+	/*
+	 * tf_send_recv cannot return an error because
+	 * it's not killable and not within a connection
+	 */
+	BUG_ON(error != 0);
+
+	/* Reset the state, so a new CREATE DEVICE CONTEXT can be sent */
+	spin_lock(&(connection->state_lock));
+	connection->state = TF_CONN_STATE_NO_DEVICE_CONTEXT;
+	spin_unlock(&(connection->state_lock));
+
+exit:
+
+#ifdef CONFIG_SMP
+	ret_affinity = sched_setaffinity(0, &saved_cpu_mask);
+	if (ret_affinity != 0)
+		dprintk(KERN_ERR "sched_setaffinity #2 -> 0x%lX", ret_affinity);
+#endif
+	return error;
+}
+
+/*----------------------------------------------------------------------------
+ * Power management
+ *----------------------------------------------------------------------------*/
+
+
+/*
+ * Handles all the power management calls.
+ * The operation is the type of power management
+ * operation to be performed.
+ *
+ * This routine will only return if a failure occured or if
+ * the required opwer management is of type "resume".
+ * "Hibernate" and "Shutdown" should lock when doing the
+ * corresponding SMC to the Secure World
+ */
+int tf_power_management(struct tf_comm *comm,
+	enum TF_POWER_OPERATION operation)
+{
+	u32 status;
+	int error = 0;
+
+	dprintk(KERN_INFO "tf_power_management(%d)\n", operation);
+
+#ifdef CONFIG_TF_ZEBRA
+	if (!test_bit(TF_COMM_FLAG_PA_AVAILABLE, &comm->flags)) {
+		dprintk(KERN_INFO "tf_power_management(%p): "
+			"succeeded (not started)\n", comm);
+
+		return 0;
+	}
+#endif
+
+	status = ((tf_read_reg32(&(comm->l1_buffer->status_s))
+		& TF_STATUS_POWER_STATE_MASK)
+		>> TF_STATUS_POWER_STATE_SHIFT);
+
+	switch (operation) {
+	case TF_POWER_OPERATION_SHUTDOWN:
+		switch (status) {
+		case TF_POWER_MODE_ACTIVE:
+			error = tf_pm_shutdown(comm);
+
+			if (error) {
+				dprintk(KERN_ERR "tf_power_management(): "
+					"Failed with error code 0x%08x\n",
+					error);
+				goto error;
+			}
+			break;
+
+		default:
+			goto not_allowed;
+		}
+		break;
+
+	case TF_POWER_OPERATION_HIBERNATE:
+		switch (status) {
+		case TF_POWER_MODE_ACTIVE:
+			error = tf_pm_hibernate(comm);
+
+			if (error) {
+				dprintk(KERN_ERR "tf_power_management(): "
+					"Failed with error code 0x%08x\n",
+					error);
+				goto error;
+			}
+			break;
+
+		default:
+			goto not_allowed;
+		}
+		break;
+
+	case TF_POWER_OPERATION_RESUME:
+		error = tf_pm_resume(comm);
+
+		if (error != 0) {
+			dprintk(KERN_ERR "tf_power_management(): "
+				"Failed with error code 0x%08x\n",
+				error);
+			goto error;
+		}
+		break;
+	}
+
+	dprintk(KERN_INFO "tf_power_management(): succeeded\n");
+	return 0;
+
+not_allowed:
+	dprintk(KERN_ERR "tf_power_management(): "
+		"Power command not allowed in current "
+		"Secure World state %d\n", status);
+	error = -ENOTTY;
+error:
+	return error;
+}
+
diff --git a/security/tf_driver/tf_comm.h b/security/tf_driver/tf_comm.h
new file mode 100644
index 000000000000..8921dc1d1be0
--- /dev/null
+++ b/security/tf_driver/tf_comm.h
@@ -0,0 +1,202 @@
+/**
+ * Copyright (c) 2011 Trusted Logic S.A.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef __TF_COMM_H__
+#define __TF_COMM_H__
+
+#include "tf_defs.h"
+#include "tf_protocol.h"
+
+/*----------------------------------------------------------------------------
+ * Misc
+ *----------------------------------------------------------------------------*/
+
+void tf_set_current_time(struct tf_comm *comm);
+
+/*
+ * Atomic accesses to 32-bit variables in the L1 Shared buffer
+ */
+static inline u32 tf_read_reg32(const u32 *comm_buffer)
+{
+	u32 result;
+
+	__asm__ __volatile__("@ tf_read_reg32\n"
+		"ldrex %0, [%1]\n"
+		: "=&r" (result)
+		: "r" (comm_buffer)
+	);
+
+	return result;
+}
+
+static inline void tf_write_reg32(void *comm_buffer, u32 value)
+{
+	u32 tmp;
+
+	__asm__ __volatile__("@ tf_write_reg32\n"
+		"1:	ldrex %0, [%2]\n"
+		"	strex %0, %1, [%2]\n"
+		"	teq   %0, #0\n"
+		"	bne   1b"
+		: "=&r" (tmp)
+		: "r" (value), "r" (comm_buffer)
+		: "cc"
+	);
+}
+
+/*
+ * Atomic accesses to 64-bit variables in the L1 Shared buffer
+ */
+static inline u64 tf_read_reg64(void *comm_buffer)
+{
+	u64 result;
+
+	__asm__ __volatile__("@ tf_read_reg64\n"
+		"ldrexd %0, [%1]\n"
+		: "=&r" (result)
+		: "r" (comm_buffer)
+	);
+
+	return result;
+}
+
+static inline void tf_write_reg64(void *comm_buffer, u64 value)
+{
+	u64 tmp;
+
+	__asm__ __volatile__("@ tf_write_reg64\n"
+		"1:	ldrexd %0, [%2]\n"
+		"	strexd %0, %1, [%2]\n"
+		"	teq    %0, #0\n"
+		"	bne    1b"
+		: "=&r" (tmp)
+		: "r" (value), "r" (comm_buffer)
+		: "cc"
+	);
+}
+
+/*----------------------------------------------------------------------------
+ * SMC operations
+ *----------------------------------------------------------------------------*/
+
+/* RPC return values */
+#define RPC_NO		0x00	/* No RPC to execute */
+#define RPC_YIELD	0x01	/* Yield RPC */
+#define RPC_NON_YIELD	0x02	/* non-Yield RPC */
+
+int tf_rpc_execute(struct tf_comm *comm);
+
+/*----------------------------------------------------------------------------
+ * Shared memory related operations
+ *----------------------------------------------------------------------------*/
+
+#define L1_DESCRIPTOR_FAULT            (0x00000000)
+#define L2_DESCRIPTOR_FAULT            (0x00000000)
+
+#define L2_DESCRIPTOR_ADDR_MASK         (0xFFFFF000)
+
+#define DESCRIPTOR_V13_12_MASK      (0x3 << PAGE_SHIFT)
+#define DESCRIPTOR_V13_12_GET(a)    ((a & DESCRIPTOR_V13_12_MASK) >> PAGE_SHIFT)
+
+struct tf_coarse_page_table *tf_alloc_coarse_page_table(
+	struct tf_coarse_page_table_allocation_context *alloc_context,
+	u32 type);
+
+void tf_free_coarse_page_table(
+	struct tf_coarse_page_table_allocation_context *alloc_context,
+	struct tf_coarse_page_table *coarse_pg_table,
+	int force);
+
+void tf_init_coarse_page_table_allocator(
+	struct tf_coarse_page_table_allocation_context *alloc_context);
+
+void tf_release_coarse_page_table_allocator(
+	struct tf_coarse_page_table_allocation_context *alloc_context);
+
+struct page *tf_l2_page_descriptor_to_page(u32 l2_page_descriptor);
+
+u32 tf_get_l2_descriptor_common(u32 vaddr, struct mm_struct *mm);
+
+void tf_cleanup_shared_memory(
+	struct tf_coarse_page_table_allocation_context *alloc_context,
+	struct tf_shmem_desc *shmem_desc,
+	u32 full_cleanup);
+
+int tf_fill_descriptor_table(
+	struct tf_coarse_page_table_allocation_context *alloc_context,
+	struct tf_shmem_desc *shmem_desc,
+	u32 buffer,
+	struct vm_area_struct **vmas,
+	u32 descriptors[TF_MAX_COARSE_PAGES],
+	u32 buffer_size,
+	u32 *buffer_start_offset,
+	bool in_user_space,
+	u32 flags,
+	u32 *descriptor_count);
+
+/*----------------------------------------------------------------------------
+ * Standard communication operations
+ *----------------------------------------------------------------------------*/
+
+int tf_schedule_secure_world(struct tf_comm *comm);
+
+int tf_send_receive(
+	struct tf_comm *comm,
+	union tf_command *command,
+	union tf_answer *answer,
+	struct tf_connection *connection,
+	bool bKillable);
+
+
+/**
+ * get a pointer to the secure world description.
+ * This points directly into the L1 shared buffer
+ * and is valid only once the communication has
+ * been initialized
+ **/
+u8 *tf_get_description(struct tf_comm *comm);
+
+/*----------------------------------------------------------------------------
+ * Power management
+ *----------------------------------------------------------------------------*/
+
+enum TF_POWER_OPERATION {
+	TF_POWER_OPERATION_HIBERNATE = 1,
+	TF_POWER_OPERATION_SHUTDOWN = 2,
+	TF_POWER_OPERATION_RESUME = 3,
+};
+
+int tf_pm_hibernate(struct tf_comm *comm);
+int tf_pm_resume(struct tf_comm *comm);
+int tf_pm_shutdown(struct tf_comm *comm);
+
+int tf_power_management(struct tf_comm *comm,
+	enum TF_POWER_OPERATION operation);
+
+
+/*----------------------------------------------------------------------------
+ * Communication initialization and termination
+ *----------------------------------------------------------------------------*/
+
+int tf_init(struct tf_comm *comm);
+
+void tf_terminate(struct tf_comm *comm);
+
+
+#endif  /* __TF_COMM_H__ */
diff --git a/security/tf_driver/tf_comm_tz.c b/security/tf_driver/tf_comm_tz.c
new file mode 100644
index 000000000000..4c89de84accf
--- /dev/null
+++ b/security/tf_driver/tf_comm_tz.c
@@ -0,0 +1,885 @@
+/**
+ * Copyright (c) 2011 Trusted Logic S.A.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <asm/div64.h>
+#include <asm/system.h>
+#include <linux/version.h>
+#include <asm/cputype.h>
+#include <linux/interrupt.h>
+#include <linux/page-flags.h>
+#include <linux/pagemap.h>
+#include <linux/vmalloc.h>
+#include <linux/jiffies.h>
+
+#include "tf_defs.h"
+#include "tf_comm.h"
+#include "tf_protocol.h"
+#include "tf_util.h"
+#include "tf_conn.h"
+
+/*
+ * Structure common to all SMC operations
+ */
+struct tf_generic_smc {
+	u32 reg0;
+	u32 reg1;
+	u32 reg2;
+	u32 reg3;
+	u32 reg4;
+};
+
+/*----------------------------------------------------------------------------
+ * SMC operations
+ *----------------------------------------------------------------------------*/
+
+static inline void tf_smc_generic_call(
+	struct tf_generic_smc *generic_smc)
+{
+#ifdef CONFIG_SMP
+	long ret;
+	cpumask_t saved_cpu_mask;
+	cpumask_t local_cpu_mask = CPU_MASK_NONE;
+
+	cpu_set(0, local_cpu_mask);
+	sched_getaffinity(0, &saved_cpu_mask);
+	ret = sched_setaffinity(0, &local_cpu_mask);
+	if (ret != 0)
+		dprintk(KERN_ERR "sched_setaffinity #1 -> 0x%lX", ret);
+#endif
+
+	__asm__ volatile(
+		"mov r0, %2\n"
+		"mov r1, %3\n"
+		"mov r2, %4\n"
+		"mov r3, %5\n"
+		"mov r4, %6\n"
+		".word    0xe1600070              @ SMC 0\n"
+		"mov %0, r0\n"
+		"mov %1, r1\n"
+		: "=r" (generic_smc->reg0), "=r" (generic_smc->reg1)
+		: "r" (generic_smc->reg0), "r" (generic_smc->reg1),
+		  "r" (generic_smc->reg2), "r" (generic_smc->reg3),
+		  "r" (generic_smc->reg4)
+		: "r0", "r1", "r2", "r3", "r4");
+
+#ifdef CONFIG_SMP
+		ret = sched_setaffinity(0, &saved_cpu_mask);
+		if (ret != 0)
+			dprintk(KERN_ERR "sched_setaffinity #2 -> 0x%lX", ret);
+#endif
+}
+
+/*
+ * Calls the get protocol version SMC.
+ * Fills the parameter pProtocolVersion with the version number returned by the
+ * SMC
+ */
+static inline void tf_smc_get_protocol_version(u32 *protocol_version)
+{
+	struct tf_generic_smc generic_smc;
+
+	generic_smc.reg0 = TF_SMC_GET_PROTOCOL_VERSION;
+	generic_smc.reg1 = 0;
+	generic_smc.reg2 = 0;
+	generic_smc.reg3 = 0;
+	generic_smc.reg4 = 0;
+
+	tf_smc_generic_call(&generic_smc);
+	*protocol_version = generic_smc.reg1;
+}
+
+
+/*
+ * Calls the init SMC with the specified parameters.
+ * Returns zero upon successful completion, or an appropriate error code upon
+ * failure.
+ */
+static inline int tf_smc_init(u32 shared_page_descriptor)
+{
+	struct tf_generic_smc generic_smc;
+
+	generic_smc.reg0 = TF_SMC_INIT;
+	/* Descriptor for the layer 1 shared buffer */
+	generic_smc.reg1 = shared_page_descriptor;
+	generic_smc.reg2 = 0;
+	generic_smc.reg3 = 0;
+	generic_smc.reg4 = 0;
+
+	tf_smc_generic_call(&generic_smc);
+	if (generic_smc.reg0 != S_SUCCESS)
+		printk(KERN_ERR "tf_smc_init:"
+			" r0=0x%08X upon return (expected 0x%08X)!\n",
+			generic_smc.reg0,
+			S_SUCCESS);
+
+	return generic_smc.reg0;
+}
+
+
+/*
+ * Calls the reset irq SMC.
+ */
+static inline void tf_smc_reset_irq(void)
+{
+	struct tf_generic_smc generic_smc;
+
+	generic_smc.reg0 = TF_SMC_RESET_IRQ;
+	generic_smc.reg1 = 0;
+	generic_smc.reg2 = 0;
+	generic_smc.reg3 = 0;
+	generic_smc.reg4 = 0;
+
+	tf_smc_generic_call(&generic_smc);
+}
+
+
+/*
+ * Calls the WAKE_UP SMC.
+ * Returns zero upon successful completion, or an appropriate error code upon
+ * failure.
+ */
+static inline int tf_smc_wake_up(u32 l1_shared_buffer_descriptor,
+	u32 shared_mem_start_offset,
+	u32 shared_mem_size)
+{
+	struct tf_generic_smc generic_smc;
+
+	generic_smc.reg0 = TF_SMC_WAKE_UP;
+	generic_smc.reg1 = shared_mem_start_offset;
+	/* long form command */
+	generic_smc.reg2 = shared_mem_size | 0x80000000;
+	generic_smc.reg3 = l1_shared_buffer_descriptor;
+	generic_smc.reg4 = 0;
+
+	tf_smc_generic_call(&generic_smc);
+
+	if (generic_smc.reg0 != S_SUCCESS)
+		printk(KERN_ERR "tf_smc_wake_up:"
+			" r0=0x%08X upon return (expected 0x%08X)!\n",
+			generic_smc.reg0,
+			S_SUCCESS);
+
+	return generic_smc.reg0;
+}
+
+/*
+ * Calls the N-Yield SMC.
+ */
+static inline void tf_smc_nyield(void)
+{
+	struct tf_generic_smc generic_smc;
+
+	generic_smc.reg0 = TF_SMC_N_YIELD;
+	generic_smc.reg1 = 0;
+	generic_smc.reg2 = 0;
+	generic_smc.reg3 = 0;
+	generic_smc.reg4 = 0;
+
+	tf_smc_generic_call(&generic_smc);
+}
+
+/* Yields the Secure World */
+int tf_schedule_secure_world(struct tf_comm *comm)
+{
+	tf_set_current_time(comm);
+
+	/* yield to the Secure World */
+	tf_smc_nyield();
+
+	return 0;
+}
+
+/*
+ * Returns the L2 descriptor for the specified user page.
+ */
+
+#define L2_INIT_DESCRIPTOR_BASE           (0x00000003)
+#define L2_INIT_DESCRIPTOR_V13_12_SHIFT   (4)
+
+static u32 tf_get_l2init_descriptor(u32 vaddr)
+{
+	struct page *page;
+	u32 paddr;
+	u32 descriptor;
+
+	descriptor = L2_INIT_DESCRIPTOR_BASE;
+
+	/* get physical address and add to descriptor */
+	page = virt_to_page(vaddr);
+	paddr = page_to_phys(page);
+	descriptor |= (paddr & L2_DESCRIPTOR_ADDR_MASK);
+
+	/* Add virtual address v[13:12] bits to descriptor */
+	descriptor |= (DESCRIPTOR_V13_12_GET(vaddr)
+		<< L2_INIT_DESCRIPTOR_V13_12_SHIFT);
+
+	descriptor |= tf_get_l2_descriptor_common(vaddr, &init_mm);
+
+
+	return descriptor;
+}
+
+
+/*----------------------------------------------------------------------------
+ * Power management
+ *----------------------------------------------------------------------------*/
+
+/*
+ * Free the memory used by the W3B buffer for the specified comm.
+ * This function does nothing if no W3B buffer is allocated for the device.
+ */
+static inline void tf_free_w3b(struct tf_comm *comm)
+{
+	tf_cleanup_shared_memory(
+		&(comm->w3b_cpt_alloc_context),
+		&(comm->w3b_shmem_desc),
+		0);
+
+	tf_release_coarse_page_table_allocator(&(comm->w3b_cpt_alloc_context));
+
+	internal_vfree((void *)comm->w3b);
+	comm->w3b = 0;
+	comm->w3b_shmem_size = 0;
+	clear_bit(TF_COMM_FLAG_W3B_ALLOCATED, &(comm->flags));
+}
+
+
+/*
+ * Allocates the W3B buffer for the specified comm.
+ * Returns zero upon successful completion, or an appropriate error code upon
+ * failure.
+ */
+static inline int tf_allocate_w3b(struct tf_comm *comm)
+{
+	int error;
+	u32 flags;
+	u32 config_flag_s;
+	u32 *w3b_descriptors;
+	u32 w3b_descriptor_count;
+	u32 w3b_current_size;
+
+	config_flag_s = tf_read_reg32(&comm->l1_buffer->config_flag_s);
+
+retry:
+	if ((test_bit(TF_COMM_FLAG_W3B_ALLOCATED, &(comm->flags))) == 0) {
+		/*
+		 * Initialize the shared memory for the W3B
+		 */
+		tf_init_coarse_page_table_allocator(
+			&comm->w3b_cpt_alloc_context);
+	} else {
+		/*
+		 * The W3B is allocated but do we have to reallocate a bigger
+		 * one?
+		 */
+		/* Check H bit */
+		if ((config_flag_s & (1<<4)) != 0) {
+			/* The size of the W3B may change after SMC_INIT */
+			/* Read the current value */
+			w3b_current_size = tf_read_reg32(
+				&comm->l1_buffer->w3b_size_current_s);
+			if (comm->w3b_shmem_size > w3b_current_size)
+				return 0;
+
+			tf_free_w3b(comm);
+			goto retry;
+		} else {
+			return 0;
+		}
+	}
+
+	/* check H bit */
+	if ((config_flag_s & (1<<4)) != 0)
+		/* The size of the W3B may change after SMC_INIT */
+		/* Read the current value */
+		comm->w3b_shmem_size = tf_read_reg32(
+			&comm->l1_buffer->w3b_size_current_s);
+	else
+		comm->w3b_shmem_size = tf_read_reg32(
+			&comm->l1_buffer->w3b_size_max_s);
+
+	comm->w3b = (u32) internal_vmalloc(comm->w3b_shmem_size);
+	if (comm->w3b == 0) {
+		printk(KERN_ERR "tf_allocate_w3b():"
+			" Out of memory for W3B buffer (%u bytes)!\n",
+			(unsigned int)(comm->w3b_shmem_size));
+		error = -ENOMEM;
+		goto error;
+	}
+
+	/* initialize the w3b_shmem_desc structure */
+	comm->w3b_shmem_desc.type = TF_SHMEM_TYPE_PM_HIBERNATE;
+	INIT_LIST_HEAD(&(comm->w3b_shmem_desc.list));
+
+	flags = (TF_SHMEM_TYPE_READ | TF_SHMEM_TYPE_WRITE);
+
+	/* directly point to the L1 shared buffer W3B descriptors */
+	w3b_descriptors = comm->l1_buffer->w3b_descriptors;
+
+	/*
+	 * tf_fill_descriptor_table uses the following parameter as an
+	 * IN/OUT
+	 */
+
+	error = tf_fill_descriptor_table(
+		&(comm->w3b_cpt_alloc_context),
+		&(comm->w3b_shmem_desc),
+		comm->w3b,
+		NULL,
+		w3b_descriptors,
+		comm->w3b_shmem_size,
+		&(comm->w3b_shmem_offset),
+		false,
+		flags,
+		&w3b_descriptor_count);
+	if (error != 0) {
+		printk(KERN_ERR "tf_allocate_w3b():"
+			" tf_fill_descriptor_table failed with "
+			"error code 0x%08x!\n",
+			error);
+		goto error;
+	}
+
+	set_bit(TF_COMM_FLAG_W3B_ALLOCATED, &(comm->flags));
+
+	/* successful completion */
+	return 0;
+
+error:
+	tf_free_w3b(comm);
+
+	return error;
+}
+
+/*
+ * Perform a Secure World shutdown operation.
+ * The routine does not return if the operation succeeds.
+ * the routine returns an appropriate error code if
+ * the operation fails.
+ */
+int tf_pm_shutdown(struct tf_comm *comm)
+{
+#ifdef CONFIG_TFN
+	/* this function is useless for the TEGRA product */
+	return 0;
+#else
+	int error;
+	union tf_command command;
+	union tf_answer answer;
+
+	dprintk(KERN_INFO "tf_pm_shutdown()\n");
+
+	memset(&command, 0, sizeof(command));
+
+	command.header.message_type = TF_MESSAGE_TYPE_MANAGEMENT;
+	command.header.message_size =
+			(sizeof(struct tf_command_management) -
+				sizeof(struct tf_command_header))/sizeof(u32);
+
+	command.management.command = TF_MANAGEMENT_SHUTDOWN;
+
+	error = tf_send_receive(
+		comm,
+		&command,
+		&answer,
+		NULL,
+		false);
+
+	if (error != 0) {
+		dprintk(KERN_ERR "tf_pm_shutdown(): "
+			"tf_send_receive failed (error %d)!\n",
+			error);
+		return error;
+	}
+
+#ifdef CONFIG_TF_DRIVER_DEBUG_SUPPORT
+	if (answer.header.error_code != 0)
+		dprintk(KERN_ERR "tf_driver: shutdown failed.\n");
+	else
+		dprintk(KERN_INFO "tf_driver: shutdown succeeded.\n");
+#endif
+
+	return answer.header.error_code;
+#endif
+}
+
+
+/*
+ * Perform a Secure World hibernate operation.
+ * The routine does not return if the operation succeeds.
+ * the routine returns an appropriate error code if
+ * the operation fails.
+ */
+int tf_pm_hibernate(struct tf_comm *comm)
+{
+#ifdef CONFIG_TFN
+	/* this function is useless for the TEGRA product */
+	return 0;
+#else
+	int error;
+	union tf_command command;
+	union tf_answer answer;
+	u32 first_command;
+	u32 first_free_command;
+
+	dprintk(KERN_INFO "tf_pm_hibernate()\n");
+
+	error = tf_allocate_w3b(comm);
+	if (error != 0) {
+		dprintk(KERN_ERR "tf_pm_hibernate(): "
+			"tf_allocate_w3b failed (error %d)!\n",
+			error);
+		return error;
+	}
+
+	/*
+	 * As the polling thread is already hibernating, we
+	 * should send the message and receive the answer ourself
+	 */
+
+	/* build the "prepare to hibernate" message */
+	command.header.message_type = TF_MESSAGE_TYPE_MANAGEMENT;
+	command.management.command = TF_MANAGEMENT_HIBERNATE;
+	/* Long Form Command */
+	command.management.shared_mem_descriptors[0] = 0;
+	command.management.shared_mem_descriptors[1] = 0;
+	command.management.w3b_size =
+		comm->w3b_shmem_size | 0x80000000;
+	command.management.w3b_start_offset =
+		comm->w3b_shmem_offset;
+	command.header.operation_id = (u32) &answer;
+
+	tf_dump_command(&command);
+
+	/* find a slot to send the message in */
+
+	/* AFY: why not use the function tf_send_receive?? We are
+	 * duplicating a lot of subtle code here. And it's not going to be
+	 * tested because power management is currently not supported by the
+	 * secure world. */
+	for (;;) {
+		int queue_words_count, command_size;
+
+		spin_lock(&(comm->lock));
+
+		first_command = tf_read_reg32(
+			&comm->l1_buffer->first_command);
+		first_free_command = tf_read_reg32(
+			&comm->l1_buffer->first_free_command);
+
+		queue_words_count = first_free_command - first_command;
+		command_size     = command.header.message_size
+			+ sizeof(struct tf_command_header);
+		if ((queue_words_count + command_size) <
+				TF_N_MESSAGE_QUEUE_CAPACITY) {
+			/* Command queue is not full */
+			memcpy(&comm->l1_buffer->command_queue[
+				first_free_command %
+					TF_N_MESSAGE_QUEUE_CAPACITY],
+				&command,
+				command_size * sizeof(u32));
+
+			tf_write_reg32(&comm->l1_buffer->first_free_command,
+				first_free_command + command_size);
+
+			spin_unlock(&(comm->lock));
+			break;
+		}
+
+		spin_unlock(&(comm->lock));
+		(void)tf_schedule_secure_world(comm);
+	}
+
+	/* now wait for the answer, dispatching other answers */
+	while (1) {
+		u32 first_answer;
+		u32 first_free_answer;
+
+		/* check all the answers */
+		first_free_answer = tf_read_reg32(
+			&comm->l1_buffer->first_free_answer);
+		first_answer = tf_read_reg32(
+			&comm->l1_buffer->first_answer);
+
+		if (first_answer != first_free_answer) {
+			int bFoundAnswer = 0;
+
+			do {
+				/* answer queue not empty */
+				union tf_answer tmp_answer;
+				struct tf_answer_header header;
+				/* size of the command in words of 32bit */
+				int command_size;
+
+				/* get the message_size */
+				memcpy(&header,
+					&comm->l1_buffer->answer_queue[
+						first_answer %
+						TF_S_ANSWER_QUEUE_CAPACITY],
+					sizeof(struct tf_answer_header));
+				command_size = header.message_size +
+					sizeof(struct tf_answer_header);
+
+				/*
+				 * NOTE: message_size is the number of words
+				 * following the first word
+				 */
+				memcpy(&tmp_answer,
+					&comm->l1_buffer->answer_queue[
+						first_answer %
+						TF_S_ANSWER_QUEUE_CAPACITY],
+					command_size * sizeof(u32));
+
+				tf_dump_answer(&tmp_answer);
+
+				if (tmp_answer.header.operation_id ==
+						(u32) &answer) {
+					/*
+					 * this is the answer to the "prepare to
+					 * hibernate" message
+					 */
+					memcpy(&answer,
+						&tmp_answer,
+						command_size * sizeof(u32));
+
+					bFoundAnswer = 1;
+					tf_write_reg32(
+						&comm->l1_buffer->first_answer,
+						first_answer + command_size);
+					break;
+				} else {
+					/*
+					 * this is a standard message answer,
+					 * dispatch it
+					 */
+					struct tf_answer_struct
+						*answerStructure;
+
+					answerStructure =
+						(struct tf_answer_struct *)
+						tmp_answer.header.operation_id;
+
+					memcpy(answerStructure->answer,
+						&tmp_answer,
+						command_size * sizeof(u32));
+
+					answerStructure->answer_copied = true;
+				}
+
+				tf_write_reg32(
+					&comm->l1_buffer->first_answer,
+					first_answer + command_size);
+			} while (first_answer != first_free_answer);
+
+			if (bFoundAnswer)
+				break;
+		}
+
+		/*
+		 * since the Secure World is at least running the "prepare to
+		 * hibernate" message, its timeout must be immediate So there is
+		 * no need to check its timeout and schedule() the current
+		 * thread
+		 */
+		(void)tf_schedule_secure_world(comm);
+	} /* while (1) */
+
+	printk(KERN_INFO "tf_driver: hibernate.\n");
+	return 0;
+#endif
+}
+
+
+/*
+ * Perform a Secure World resume operation.
+ * The routine returns once the Secure World is active again
+ * or if an error occurs during the "resume" process
+ */
+int tf_pm_resume(struct tf_comm *comm)
+{
+#ifdef CONFIG_TFN
+	/* this function is useless for the TEGRA product */
+	return 0;
+#else
+	int error;
+	u32 status;
+
+	dprintk(KERN_INFO "tf_pm_resume()\n");
+
+	error = tf_smc_wake_up(
+		tf_get_l2init_descriptor((u32)comm->l1_buffer),
+		comm->w3b_shmem_offset,
+		comm->w3b_shmem_size);
+
+	if (error != 0) {
+		dprintk(KERN_ERR "tf_pm_resume(): "
+			"tf_smc_wake_up failed (error %d)!\n",
+			error);
+		return error;
+	}
+
+	status = ((tf_read_reg32(&(comm->l1_buffer->status_s))
+		& TF_STATUS_POWER_STATE_MASK)
+		>> TF_STATUS_POWER_STATE_SHIFT);
+
+	while ((status != TF_POWER_MODE_ACTIVE)
+			&& (status != TF_POWER_MODE_PANIC)) {
+		tf_smc_nyield();
+
+		status = ((tf_read_reg32(&(comm->l1_buffer->status_s))
+			& TF_STATUS_POWER_STATE_MASK)
+			>> TF_STATUS_POWER_STATE_SHIFT);
+
+		/*
+		 * As this may last quite a while, call the kernel scheduler to
+		 * hand over CPU for other operations
+		 */
+		schedule();
+	}
+
+	switch (status) {
+	case TF_POWER_MODE_ACTIVE:
+		break;
+
+	case TF_POWER_MODE_PANIC:
+		dprintk(KERN_ERR "tf_pm_resume(): "
+			"Secure World POWER_MODE_PANIC!\n");
+		return -EINVAL;
+
+	default:
+		dprintk(KERN_ERR "tf_pm_resume(): "
+			"unexpected Secure World POWER_MODE (%d)!\n", status);
+		return -EINVAL;
+	}
+
+	dprintk(KERN_INFO "tf_pm_resume() succeeded\n");
+	return 0;
+#endif
+}
+
+/*----------------------------------------------------------------------------
+ * Communication initialization and termination
+ *----------------------------------------------------------------------------*/
+
+/*
+ * Handles the software interrupts issued by the Secure World.
+ */
+static irqreturn_t tf_soft_int_handler(int irq, void *dev_id)
+{
+	struct tf_comm *comm = (struct tf_comm *) dev_id;
+
+	if (comm->l1_buffer == NULL)
+		return IRQ_NONE;
+
+	if ((tf_read_reg32(&comm->l1_buffer->status_s) &
+			TF_STATUS_P_MASK) == 0)
+		/* interrupt not issued by the Trusted Foundations Software */
+		return IRQ_NONE;
+
+	tf_smc_reset_irq();
+
+	/* signal N_SM_EVENT */
+	wake_up(&comm->wait_queue);
+
+	return IRQ_HANDLED;
+}
+
+/*
+ * Initializes the communication with the Secure World.
+ * The L1 shared buffer is allocated and the Secure World
+ * is yielded for the first time.
+ * returns successfuly once the communication with
+ * the Secure World is up and running
+ *
+ * Returns 0 upon success or appropriate error code
+ * upon failure
+ */
+int tf_init(struct tf_comm *comm)
+{
+	int error;
+	struct page *buffer_page;
+	u32 protocol_version;
+
+	dprintk(KERN_INFO "tf_init()\n");
+
+	spin_lock_init(&(comm->lock));
+	comm->flags = 0;
+	comm->l1_buffer = NULL;
+	init_waitqueue_head(&(comm->wait_queue));
+
+	/*
+	 * Check the Secure World protocol version is the expected one.
+	 */
+	tf_smc_get_protocol_version(&protocol_version);
+
+	if ((GET_PROTOCOL_MAJOR_VERSION(protocol_version))
+			!= TF_S_PROTOCOL_MAJOR_VERSION) {
+		printk(KERN_ERR "tf_init():"
+			" Unsupported Secure World Major Version "
+			"(0x%02X, expected 0x%02X)!\n",
+			GET_PROTOCOL_MAJOR_VERSION(protocol_version),
+			TF_S_PROTOCOL_MAJOR_VERSION);
+		error = -EIO;
+		goto error;
+	}
+
+	/*
+	 * Register the software interrupt handler if required to.
+	 */
+	if (comm->soft_int_irq != -1) {
+		dprintk(KERN_INFO "tf_init(): "
+			"Registering software interrupt handler (IRQ %d)\n",
+			comm->soft_int_irq);
+
+		error = request_irq(comm->soft_int_irq,
+			tf_soft_int_handler,
+			IRQF_SHARED,
+			TF_DEVICE_BASE_NAME,
+			comm);
+		if (error != 0) {
+			dprintk(KERN_ERR "tf_init(): "
+				"request_irq failed for irq %d (error %d)\n",
+			comm->soft_int_irq, error);
+			goto error;
+		}
+		set_bit(TF_COMM_FLAG_IRQ_REQUESTED, &(comm->flags));
+	}
+
+	/*
+	 * Allocate and initialize the L1 shared buffer.
+	 */
+	comm->l1_buffer = (void *) internal_get_zeroed_page(GFP_KERNEL);
+	if (comm->l1_buffer == NULL) {
+		printk(KERN_ERR "tf_init():"
+			" get_zeroed_page failed for L1 shared buffer!\n");
+		error = -ENOMEM;
+		goto error;
+	}
+
+	/*
+	 * Ensure the page storing the L1 shared buffer is mapped.
+	 */
+	buffer_page = virt_to_page(comm->l1_buffer);
+	trylock_page(buffer_page);
+
+	dprintk(KERN_INFO "tf_init(): "
+		"L1 shared buffer allocated at virtual:%p, "
+		"physical:%p (page:%p)\n",
+		comm->l1_buffer,
+		(void *)virt_to_phys(comm->l1_buffer),
+		buffer_page);
+
+	set_bit(TF_COMM_FLAG_L1_SHARED_ALLOCATED, &(comm->flags));
+
+	/*
+	 * Init SMC
+	 */
+	error = tf_smc_init(
+		tf_get_l2init_descriptor((u32)comm->l1_buffer));
+	if (error != S_SUCCESS) {
+		dprintk(KERN_ERR "tf_init(): "
+			"tf_smc_init failed (error 0x%08X)!\n",
+			error);
+		goto error;
+	}
+
+	/*
+	 * check whether the interrupts are actually enabled
+	 * If not, remove irq handler
+	 */
+	if ((tf_read_reg32(&comm->l1_buffer->config_flag_s) &
+			TF_CONFIG_FLAG_S) == 0) {
+		if (test_and_clear_bit(TF_COMM_FLAG_IRQ_REQUESTED,
+				&(comm->flags)) != 0) {
+			dprintk(KERN_INFO "tf_init(): "
+				"Interrupts not used, unregistering "
+				"softint (IRQ %d)\n",
+				comm->soft_int_irq);
+
+			free_irq(comm->soft_int_irq, comm);
+		}
+	} else {
+		if (test_bit(TF_COMM_FLAG_IRQ_REQUESTED,
+				&(comm->flags)) == 0) {
+			/*
+			 * Interrupts are enabled in the Secure World, but not
+			 * handled by driver
+			 */
+			dprintk(KERN_ERR "tf_init(): "
+				"soft_interrupt argument not provided\n");
+			error = -EINVAL;
+			goto error;
+		}
+	}
+
+	/*
+	 * Successful completion.
+	 */
+
+	/* yield for the first time */
+	(void)tf_schedule_secure_world(comm);
+
+	dprintk(KERN_INFO "tf_init(): Success\n");
+	return S_SUCCESS;
+
+error:
+	/*
+	 * Error handling.
+	 */
+	dprintk(KERN_INFO "tf_init(): Failure (error %d)\n",
+		error);
+	tf_terminate(comm);
+	return error;
+}
+
+
+/*
+ * Attempt to terminate the communication with the Secure World.
+ * The L1 shared buffer is freed.
+ * Calling this routine terminates definitaly the communication
+ * with the Secure World : there is no way to inform the Secure World of a new
+ * L1 shared buffer to be used once it has been initialized.
+ */
+void tf_terminate(struct tf_comm *comm)
+{
+	dprintk(KERN_INFO "tf_terminate()\n");
+
+	set_bit(TF_COMM_FLAG_TERMINATING, &(comm->flags));
+
+	if ((test_bit(TF_COMM_FLAG_W3B_ALLOCATED,
+			&(comm->flags))) != 0) {
+		dprintk(KERN_INFO "tf_terminate(): "
+			"Freeing the W3B buffer...\n");
+		tf_free_w3b(comm);
+	}
+
+	if ((test_bit(TF_COMM_FLAG_L1_SHARED_ALLOCATED,
+			&(comm->flags))) != 0) {
+		__clear_page_locked(virt_to_page(comm->l1_buffer));
+		internal_free_page((unsigned long) comm->l1_buffer);
+	}
+
+	if ((test_bit(TF_COMM_FLAG_IRQ_REQUESTED,
+			&(comm->flags))) != 0) {
+		dprintk(KERN_INFO "tf_terminate(): "
+			"Unregistering softint (IRQ %d)\n",
+			comm->soft_int_irq);
+		free_irq(comm->soft_int_irq, comm);
+	}
+}
diff --git a/security/tf_driver/tf_conn.c b/security/tf_driver/tf_conn.c
new file mode 100644
index 000000000000..3148fec46358
--- /dev/null
+++ b/security/tf_driver/tf_conn.c
@@ -0,0 +1,1574 @@
+/**
+ * Copyright (c) 2011 Trusted Logic S.A.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <linux/atomic.h>
+#include <linux/uaccess.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/list.h>
+#include <linux/mm.h>
+#include <linux/pagemap.h>
+#include <linux/stddef.h>
+#include <linux/types.h>
+
+#include "s_version.h"
+
+#include "tf_protocol.h"
+#include "tf_defs.h"
+#include "tf_util.h"
+#include "tf_comm.h"
+#include "tf_conn.h"
+
+#ifdef CONFIG_TF_ZEBRA
+#include "tf_crypto.h"
+#endif
+
+#ifdef CONFIG_ANDROID
+#define TF_PRIVILEGED_UID_GID 1000 /* Android system AID */
+#else
+#define TF_PRIVILEGED_UID_GID 0
+#endif
+
+/*----------------------------------------------------------------------------
+ * Management of the shared memory blocks.
+ *
+ * Shared memory blocks are the blocks registered through
+ * the commands REGISTER_SHARED_MEMORY and POWER_MANAGEMENT
+ *----------------------------------------------------------------------------*/
+
+/**
+ * Unmaps a shared memory
+ **/
+void tf_unmap_shmem(
+		struct tf_connection *connection,
+		struct tf_shmem_desc *shmem_desc,
+		u32 full_cleanup)
+{
+	/* check shmem_desc contains a descriptor */
+	if (shmem_desc == NULL)
+		return;
+
+	dprintk(KERN_DEBUG "tf_unmap_shmem(%p)\n", shmem_desc);
+
+retry:
+	mutex_lock(&(connection->shmem_mutex));
+	if (atomic_read(&shmem_desc->ref_count) > 1) {
+		/*
+		 * Shared mem still in use, wait for other operations completion
+		 * before actually unmapping it.
+		 */
+		dprintk(KERN_INFO "Descriptor in use\n");
+		mutex_unlock(&(connection->shmem_mutex));
+		schedule();
+		goto retry;
+	}
+
+	tf_cleanup_shared_memory(
+			&(connection->cpt_alloc_context),
+			shmem_desc,
+			full_cleanup);
+
+	list_del(&(shmem_desc->list));
+
+	if ((shmem_desc->type == TF_SHMEM_TYPE_REGISTERED_SHMEM) ||
+			(full_cleanup != 0)) {
+		internal_kfree(shmem_desc);
+
+		atomic_dec(&(connection->shmem_count));
+	} else {
+		/*
+		 * This is a preallocated shared memory, add to free list
+		 * Since the device context is unmapped last, it is
+		 * always the first element of the free list if no
+		 * device context has been created
+		 */
+		shmem_desc->block_identifier = 0;
+		list_add(&(shmem_desc->list), &(connection->free_shmem_list));
+	}
+
+	mutex_unlock(&(connection->shmem_mutex));
+}
+
+
+/**
+ * Find the first available slot for a new block of shared memory
+ * and map the user buffer.
+ * Update the descriptors to L1 descriptors
+ * Update the buffer_start_offset and buffer_size fields
+ * shmem_desc is updated to the mapped shared memory descriptor
+ **/
+int tf_map_shmem(
+		struct tf_connection *connection,
+		u32 buffer,
+		/* flags for read-write access rights on the memory */
+		u32 flags,
+		bool in_user_space,
+		u32 descriptors[TF_MAX_COARSE_PAGES],
+		u32 *buffer_start_offset,
+		u32 buffer_size,
+		struct tf_shmem_desc **shmem_desc,
+		u32 *descriptor_count)
+{
+	struct tf_shmem_desc *desc = NULL;
+	int error;
+
+	dprintk(KERN_INFO "tf_map_shmem(%p, %p, flags = 0x%08x)\n",
+					connection,
+					(void *) buffer,
+					flags);
+
+	mutex_lock(&(connection->shmem_mutex));
+
+	/*
+	 * Check the list of free shared memory
+	 * is not empty
+	 */
+	if (list_empty(&(connection->free_shmem_list))) {
+		if (atomic_read(&(connection->shmem_count)) ==
+				TF_SHMEM_MAX_COUNT) {
+			printk(KERN_ERR "tf_map_shmem(%p):"
+				" maximum shared memories already registered\n",
+				connection);
+			error = -ENOMEM;
+			goto error;
+		}
+
+		/* no descriptor available, allocate a new one */
+
+		desc = (struct tf_shmem_desc *) internal_kmalloc(
+			sizeof(*desc), GFP_KERNEL);
+		if (desc == NULL) {
+			printk(KERN_ERR "tf_map_shmem(%p):"
+				" failed to allocate descriptor\n",
+				connection);
+			error = -ENOMEM;
+			goto error;
+		}
+
+		/* Initialize the structure */
+		desc->type = TF_SHMEM_TYPE_REGISTERED_SHMEM;
+		atomic_set(&desc->ref_count, 1);
+		INIT_LIST_HEAD(&(desc->list));
+
+		atomic_inc(&(connection->shmem_count));
+	} else {
+		/* take the first free shared memory descriptor */
+		desc = list_first_entry(&(connection->free_shmem_list),
+			struct tf_shmem_desc, list);
+		list_del(&(desc->list));
+	}
+
+	/* Add the descriptor to the used list */
+	list_add(&(desc->list), &(connection->used_shmem_list));
+
+	error = tf_fill_descriptor_table(
+			&(connection->cpt_alloc_context),
+			desc,
+			buffer,
+			connection->vmas,
+			descriptors,
+			buffer_size,
+			buffer_start_offset,
+			in_user_space,
+			flags,
+			descriptor_count);
+
+	if (error != 0) {
+		dprintk(KERN_ERR "tf_map_shmem(%p):"
+			" tf_fill_descriptor_table failed with error "
+			"code %d!\n",
+			connection,
+			error);
+		goto error;
+	}
+	desc->client_buffer = (u8 *) buffer;
+
+	/*
+	 * Successful completion.
+	 */
+	*shmem_desc = desc;
+	mutex_unlock(&(connection->shmem_mutex));
+	dprintk(KERN_DEBUG "tf_map_shmem: success\n");
+	return 0;
+
+
+	/*
+	 * Error handling.
+	 */
+error:
+	mutex_unlock(&(connection->shmem_mutex));
+	dprintk(KERN_ERR "tf_map_shmem: failure with error code %d\n",
+		error);
+
+	tf_unmap_shmem(
+			connection,
+			desc,
+			0);
+
+	return error;
+}
+
+
+
+/* This function is a copy of the find_vma() function
+in linux kernel 2.6.15 version with some fixes :
+	- memory block may end on vm_end
+	- check the full memory block is in the memory area
+	- guarantee NULL is returned if no memory area is found */
+struct vm_area_struct *tf_find_vma(struct mm_struct *mm,
+	unsigned long addr, unsigned long size)
+{
+	struct vm_area_struct *vma = NULL;
+
+	dprintk(KERN_INFO
+		"tf_find_vma addr=0x%lX size=0x%lX\n", addr, size);
+
+	if (mm) {
+		/* Check the cache first. */
+		/* (Cache hit rate is typically around 35%.) */
+		vma = mm->mmap_cache;
+		if (!(vma && vma->vm_end >= (addr+size) &&
+				vma->vm_start <= addr))	{
+			struct rb_node *rb_node;
+
+			rb_node = mm->mm_rb.rb_node;
+			vma = NULL;
+
+			while (rb_node) {
+				struct vm_area_struct *vma_tmp;
+
+				vma_tmp = rb_entry(rb_node,
+					struct vm_area_struct, vm_rb);
+
+				dprintk(KERN_INFO
+					"vma_tmp->vm_start=0x%lX"
+					"vma_tmp->vm_end=0x%lX\n",
+					vma_tmp->vm_start,
+					vma_tmp->vm_end);
+
+				if (vma_tmp->vm_end >= (addr+size)) {
+					vma = vma_tmp;
+					if (vma_tmp->vm_start <= addr)
+						break;
+
+					rb_node = rb_node->rb_left;
+				} else {
+					rb_node = rb_node->rb_right;
+				}
+			}
+
+			if (vma)
+				mm->mmap_cache = vma;
+			if (rb_node == NULL)
+				vma = NULL;
+		}
+	}
+	return vma;
+}
+
+int tf_validate_shmem_and_flags(
+	u32 shmem,
+	u32 shmem_size,
+	u32 flags)
+{
+	struct vm_area_struct *vma;
+	u32 chunk;
+
+	if (shmem_size == 0)
+		/* This is always valid */
+		return 0;
+
+	if ((shmem + shmem_size) < shmem)
+		/* Overflow */
+		return -EINVAL;
+
+	down_read(&current->mm->mmap_sem);
+
+	/*
+	 *  When looking for a memory address, split buffer into chunks of
+	 *  size=PAGE_SIZE.
+	 */
+	chunk = PAGE_SIZE - (shmem & (PAGE_SIZE-1));
+	if (chunk > shmem_size)
+		chunk = shmem_size;
+
+	do {
+		vma = tf_find_vma(current->mm, shmem, chunk);
+
+		if (vma == NULL) {
+			dprintk(KERN_ERR "%s: area not found\n", __func__);
+			goto error;
+		}
+
+		if (flags & TF_SHMEM_TYPE_READ)
+			if (!(vma->vm_flags & VM_READ)) {
+				dprintk(KERN_ERR "%s: no read permission\n",
+					__func__);
+				goto error;
+			}
+		if (flags & TF_SHMEM_TYPE_WRITE)
+			if (!(vma->vm_flags & VM_WRITE)) {
+				dprintk(KERN_ERR "%s: no write permission\n",
+					__func__);
+				goto error;
+			}
+
+		shmem_size -= chunk;
+		shmem += chunk;
+		chunk = (shmem_size <= PAGE_SIZE ?
+				shmem_size : PAGE_SIZE);
+	} while (shmem_size != 0);
+
+	up_read(&current->mm->mmap_sem);
+	return 0;
+
+error:
+	up_read(&current->mm->mmap_sem);
+	return -EFAULT;
+}
+
+
+static int tf_map_temp_shmem(struct tf_connection *connection,
+	 struct tf_command_param_temp_memref *temp_memref,
+	 u32 param_type,
+	 struct tf_shmem_desc **shmem_desc)
+{
+	u32 flags;
+	u32 error = S_SUCCESS;
+	bool in_user_space = connection->owner != TF_CONNECTION_OWNER_KERNEL;
+
+	dprintk(KERN_INFO "tf_map_temp_shmem(%p, "
+		"0x%08x[size=0x%08x], offset=0x%08x)\n",
+		connection,
+		temp_memref->descriptor,
+		temp_memref->size,
+		temp_memref->offset);
+
+	switch (param_type) {
+	case TF_PARAM_TYPE_MEMREF_TEMP_INPUT:
+		flags = TF_SHMEM_TYPE_READ;
+		break;
+	case TF_PARAM_TYPE_MEMREF_TEMP_OUTPUT:
+		flags = TF_SHMEM_TYPE_WRITE;
+		break;
+	case TF_PARAM_TYPE_MEMREF_TEMP_INOUT:
+		flags = TF_SHMEM_TYPE_WRITE | TF_SHMEM_TYPE_READ;
+		break;
+	default:
+		error = -EINVAL;
+		goto error;
+	}
+
+	if (temp_memref->descriptor == 0) {
+		/* NULL tmpref */
+		temp_memref->offset = 0;
+		*shmem_desc = NULL;
+	} else if ((temp_memref->descriptor != 0) &&
+			(temp_memref->size == 0)) {
+		/* Empty tmpref */
+		temp_memref->offset = temp_memref->descriptor;
+		temp_memref->descriptor = 0;
+		temp_memref->size = 0;
+		*shmem_desc = NULL;
+	} else {
+		/* Map the temp shmem block */
+
+		u32 shared_mem_descriptors[TF_MAX_COARSE_PAGES];
+		u32 descriptor_count;
+
+		if (in_user_space) {
+			error = tf_validate_shmem_and_flags(
+				temp_memref->descriptor,
+				temp_memref->size,
+				flags);
+			if (error != 0)
+				goto error;
+		}
+
+		error = tf_map_shmem(
+				connection,
+				temp_memref->descriptor,
+				flags,
+				in_user_space,
+				shared_mem_descriptors,
+				&(temp_memref->offset),
+				temp_memref->size,
+				shmem_desc,
+				&descriptor_count);
+		temp_memref->descriptor = shared_mem_descriptors[0];
+	 }
+
+error:
+	 return error;
+}
+
+/*
+ * Clean up a list of shared memory descriptors.
+ */
+static void tf_shared_memory_cleanup_list(
+		struct tf_connection *connection,
+		struct list_head *shmem_desc_list)
+{
+	while (!list_empty(shmem_desc_list)) {
+		struct tf_shmem_desc *shmem_desc;
+
+		shmem_desc = list_first_entry(shmem_desc_list,
+			struct tf_shmem_desc, list);
+
+		tf_unmap_shmem(connection, shmem_desc, 1);
+	}
+}
+
+
+/*
+ * Clean up the shared memory information in the connection.
+ * Releases all allocated pages.
+ */
+static void tf_cleanup_shared_memories(struct tf_connection *connection)
+{
+	/* clean up the list of used and free descriptors.
+	 * done outside the mutex, because tf_unmap_shmem already
+	 * mutex()ed
+	 */
+	tf_shared_memory_cleanup_list(connection,
+		&connection->used_shmem_list);
+	tf_shared_memory_cleanup_list(connection,
+		&connection->free_shmem_list);
+
+	mutex_lock(&(connection->shmem_mutex));
+
+	/* Free the Vmas page */
+	if (connection->vmas) {
+		internal_free_page((unsigned long) connection->vmas);
+		connection->vmas = NULL;
+	}
+
+	tf_release_coarse_page_table_allocator(
+		&(connection->cpt_alloc_context));
+
+	mutex_unlock(&(connection->shmem_mutex));
+}
+
+
+/*
+ * Initialize the shared memory in a connection.
+ * Allocates the minimum memory to be provided
+ * for shared memory management
+ */
+int tf_init_shared_memory(struct tf_connection *connection)
+{
+	int error;
+	int i;
+	int coarse_page_index;
+
+	/*
+	 * We only need to initialize special elements and attempt to allocate
+	 * the minimum shared memory descriptors we want to support
+	 */
+
+	mutex_init(&(connection->shmem_mutex));
+	INIT_LIST_HEAD(&(connection->free_shmem_list));
+	INIT_LIST_HEAD(&(connection->used_shmem_list));
+	atomic_set(&(connection->shmem_count), 0);
+
+	tf_init_coarse_page_table_allocator(
+		&(connection->cpt_alloc_context));
+
+
+	/*
+	 * Preallocate 3 pages to increase the chances that a connection
+	 * succeeds in allocating shared mem
+	 */
+	for (i = 0;
+	     i < 3;
+	     i++) {
+		struct tf_shmem_desc *shmem_desc =
+			(struct tf_shmem_desc *) internal_kmalloc(
+				sizeof(*shmem_desc), GFP_KERNEL);
+
+		if (shmem_desc == NULL) {
+			printk(KERN_ERR "tf_init_shared_memory(%p):"
+				" failed to pre allocate descriptor %d\n",
+				connection,
+				i);
+			error = -ENOMEM;
+			goto error;
+		}
+
+		for (coarse_page_index = 0;
+		     coarse_page_index < TF_MAX_COARSE_PAGES;
+		     coarse_page_index++) {
+			struct tf_coarse_page_table *coarse_pg_table;
+
+			coarse_pg_table = tf_alloc_coarse_page_table(
+				&(connection->cpt_alloc_context),
+				TF_PAGE_DESCRIPTOR_TYPE_PREALLOCATED);
+
+			if (coarse_pg_table == NULL) {
+				printk(KERN_ERR "tf_init_shared_memory(%p)"
+					": descriptor %d coarse page %d - "
+					"tf_alloc_coarse_page_table() "
+					"failed\n",
+					connection,
+					i,
+					coarse_page_index);
+				error = -ENOMEM;
+				goto error;
+			}
+
+			shmem_desc->coarse_pg_table[coarse_page_index] =
+				coarse_pg_table;
+		}
+		shmem_desc->coarse_pg_table_count = 0;
+
+		shmem_desc->type = TF_SHMEM_TYPE_PREALLOC_REGISTERED_SHMEM;
+		atomic_set(&shmem_desc->ref_count, 1);
+
+		/*
+		 * add this preallocated descriptor to the list of free
+		 * descriptors Keep the device context specific one at the
+		 * beginning of the list
+		 */
+		INIT_LIST_HEAD(&(shmem_desc->list));
+		list_add_tail(&(shmem_desc->list),
+			&(connection->free_shmem_list));
+	}
+
+	/* allocate memory for the vmas structure */
+	connection->vmas =
+		(struct vm_area_struct **) internal_get_zeroed_page(GFP_KERNEL);
+	if (connection->vmas == NULL) {
+		printk(KERN_ERR "tf_init_shared_memory(%p):"
+			" vmas - failed to get_zeroed_page\n",
+			connection);
+		error = -ENOMEM;
+		goto error;
+	}
+
+	return 0;
+
+error:
+	tf_cleanup_shared_memories(connection);
+	return error;
+}
+
+/*----------------------------------------------------------------------------
+ * Connection operations to the Secure World
+ *----------------------------------------------------------------------------*/
+
+int tf_create_device_context(
+	struct tf_connection *connection)
+{
+	union tf_command command;
+	union tf_answer  answer;
+	int error = 0;
+
+	dprintk(KERN_INFO "tf_create_device_context(%p)\n",
+			connection);
+
+	command.create_device_context.message_type =
+		TF_MESSAGE_TYPE_CREATE_DEVICE_CONTEXT;
+	command.create_device_context.message_size =
+		(sizeof(struct tf_command_create_device_context)
+			- sizeof(struct tf_command_header))/sizeof(u32);
+	command.create_device_context.operation_id = (u32) &answer;
+	command.create_device_context.device_context_id = (u32) connection;
+
+	error = tf_send_receive(
+		&connection->dev->sm,
+		&command,
+		&answer,
+		connection,
+		true);
+
+	if ((error != 0) ||
+		(answer.create_device_context.error_code != S_SUCCESS))
+		goto error;
+
+	/*
+	 * CREATE_DEVICE_CONTEXT succeeded,
+	 * store device context handler and update connection status
+	 */
+	connection->device_context =
+		answer.create_device_context.device_context;
+	spin_lock(&(connection->state_lock));
+	connection->state = TF_CONN_STATE_VALID_DEVICE_CONTEXT;
+	spin_unlock(&(connection->state_lock));
+
+	/* successful completion */
+	dprintk(KERN_INFO "tf_create_device_context(%p):"
+		" device_context=0x%08x\n",
+		connection,
+		answer.create_device_context.device_context);
+	return 0;
+
+error:
+	if (error != 0) {
+		dprintk(KERN_ERR "tf_create_device_context failed with "
+			"error %d\n", error);
+	} else {
+		/*
+		 * We sent a DeviceCreateContext. The state is now
+		 * TF_CONN_STATE_CREATE_DEVICE_CONTEXT_SENT It has to be
+		 * reset if we ever want to send a DeviceCreateContext again
+		 */
+		spin_lock(&(connection->state_lock));
+		connection->state = TF_CONN_STATE_NO_DEVICE_CONTEXT;
+		spin_unlock(&(connection->state_lock));
+		dprintk(KERN_ERR "tf_create_device_context failed with "
+			"error_code 0x%08X\n",
+			answer.create_device_context.error_code);
+		if (answer.create_device_context.error_code ==
+			S_ERROR_OUT_OF_MEMORY)
+			error = -ENOMEM;
+		else
+			error = -EFAULT;
+	}
+
+	return error;
+}
+
+/* Check that the current application belongs to the
+ * requested GID */
+static bool tf_check_gid(gid_t requested_gid)
+{
+	if (requested_gid == current_egid()) {
+		return true;
+	} else {
+		u32    size;
+		u32    i;
+		/* Look in the supplementary GIDs */
+		get_group_info(GROUP_INFO);
+		size = GROUP_INFO->ngroups;
+		for (i = 0; i < size; i++)
+			if (requested_gid == GROUP_AT(GROUP_INFO , i))
+				return true;
+	}
+	return false;
+}
+
+/*
+ * Opens a client session to the Secure World
+ */
+int tf_open_client_session(
+	struct tf_connection *connection,
+	union tf_command *command,
+	union tf_answer *answer)
+{
+	int error = 0;
+	struct tf_shmem_desc *shmem_desc[4] = {NULL};
+	u32 i;
+
+	dprintk(KERN_INFO "tf_open_client_session(%p)\n", connection);
+
+	/*
+	 * Initialize the message size with no login data. This will be later
+	 * adjusted the the cases below
+	 */
+	command->open_client_session.message_size =
+		(sizeof(struct tf_command_open_client_session) - 20
+			- sizeof(struct tf_command_header))/4;
+
+	switch (command->open_client_session.login_type) {
+	case TF_LOGIN_PUBLIC:
+		 /* Nothing to do */
+		 break;
+
+	case TF_LOGIN_USER:
+		/*
+		 * Send the EUID of the calling application in the login data.
+		 * Update message size.
+		 */
+		*(u32 *) &command->open_client_session.login_data =
+			current_euid();
+#ifndef CONFIG_ANDROID
+		command->open_client_session.login_type =
+			(u32) TF_LOGIN_USER_LINUX_EUID;
+#else
+		command->open_client_session.login_type =
+			(u32) TF_LOGIN_USER_ANDROID_EUID;
+#endif
+
+		/* Added one word */
+		command->open_client_session.message_size += 1;
+		break;
+
+	case TF_LOGIN_GROUP: {
+		/* Check requested GID */
+		gid_t  requested_gid =
+			*(u32 *) command->open_client_session.login_data;
+
+		if (!tf_check_gid(requested_gid)) {
+			dprintk(KERN_ERR "tf_open_client_session(%p) "
+				"TF_LOGIN_GROUP: requested GID (0x%x) does "
+				"not match real eGID (0x%x)"
+				"or any of the supplementary GIDs\n",
+				connection, requested_gid, current_egid());
+			error = -EACCES;
+			goto error;
+		}
+#ifndef CONFIG_ANDROID
+		command->open_client_session.login_type =
+			TF_LOGIN_GROUP_LINUX_GID;
+#else
+		command->open_client_session.login_type =
+			TF_LOGIN_GROUP_ANDROID_GID;
+#endif
+
+		command->open_client_session.message_size += 1; /* GID */
+		break;
+	}
+
+#ifndef CONFIG_ANDROID
+	case TF_LOGIN_APPLICATION: {
+		/*
+		 * Compute SHA-1 hash of the application fully-qualified path
+		 * name.  Truncate the hash to 16 bytes and send it as login
+		 * data.  Update message size.
+		 */
+		u8 pSHA1Hash[SHA1_DIGEST_SIZE];
+
+		error = tf_hash_application_path_and_data(pSHA1Hash,
+			NULL, 0);
+		if (error != 0) {
+			dprintk(KERN_ERR "tf_open_client_session: "
+				"error in tf_hash_application_path_and_data\n");
+			goto error;
+		}
+		memcpy(&command->open_client_session.login_data,
+			pSHA1Hash, 16);
+		command->open_client_session.login_type =
+			TF_LOGIN_APPLICATION_LINUX_PATH_SHA1_HASH;
+		/* 16 bytes */
+		command->open_client_session.message_size += 4;
+		break;
+	}
+#else
+	case TF_LOGIN_APPLICATION:
+		/*
+		 * Send the real UID of the calling application in the login
+		 * data. Update message size.
+		 */
+		*(u32 *) &command->open_client_session.login_data =
+			current_uid();
+
+		command->open_client_session.login_type =
+			(u32) TF_LOGIN_APPLICATION_ANDROID_UID;
+
+		/* Added one word */
+		command->open_client_session.message_size += 1;
+		break;
+#endif
+
+#ifndef CONFIG_ANDROID
+	case TF_LOGIN_APPLICATION_USER: {
+		/*
+		 * Compute SHA-1 hash of the concatenation of the application
+		 * fully-qualified path name and the EUID of the calling
+		 * application.  Truncate the hash to 16 bytes and send it as
+		 * login data.  Update message size.
+		 */
+		u8 pSHA1Hash[SHA1_DIGEST_SIZE];
+
+		error = tf_hash_application_path_and_data(pSHA1Hash,
+			(u8 *) &(current_euid()), sizeof(current_euid()));
+		if (error != 0) {
+			dprintk(KERN_ERR "tf_open_client_session: "
+				"error in tf_hash_application_path_and_data\n");
+			goto error;
+		}
+		memcpy(&command->open_client_session.login_data,
+			pSHA1Hash, 16);
+		command->open_client_session.login_type =
+			TF_LOGIN_APPLICATION_USER_LINUX_PATH_EUID_SHA1_HASH;
+
+		/* 16 bytes */
+		command->open_client_session.message_size += 4;
+
+		break;
+	}
+#else
+	case TF_LOGIN_APPLICATION_USER:
+		/*
+		 * Send the real UID and the EUID of the calling application in
+		 * the login data. Update message size.
+		 */
+		*(u32 *) &command->open_client_session.login_data =
+			current_uid();
+		*(u32 *) &command->open_client_session.login_data[4] =
+			current_euid();
+
+		command->open_client_session.login_type =
+			TF_LOGIN_APPLICATION_USER_ANDROID_UID_EUID;
+
+		/* Added two words */
+		command->open_client_session.message_size += 2;
+		break;
+#endif
+
+#ifndef CONFIG_ANDROID
+	case TF_LOGIN_APPLICATION_GROUP: {
+		/*
+		 * Check requested GID.  Compute SHA-1 hash of the concatenation
+		 * of the application fully-qualified path name and the
+		 * requested GID.  Update message size
+		 */
+		gid_t  requested_gid;
+		u8     pSHA1Hash[SHA1_DIGEST_SIZE];
+
+		requested_gid =	*(u32 *) &command->open_client_session.
+			login_data;
+
+		if (!tf_check_gid(requested_gid)) {
+			dprintk(KERN_ERR "tf_open_client_session(%p) "
+			"TF_LOGIN_APPLICATION_GROUP: requested GID (0x%x) "
+			"does not match real eGID (0x%x)"
+			"or any of the supplementary GIDs\n",
+			connection, requested_gid, current_egid());
+			error = -EACCES;
+			goto error;
+		}
+
+		error = tf_hash_application_path_and_data(pSHA1Hash,
+			&requested_gid, sizeof(u32));
+		if (error != 0) {
+			dprintk(KERN_ERR "tf_open_client_session: "
+				"error in tf_hash_application_path_and_data\n");
+			goto error;
+		}
+
+		memcpy(&command->open_client_session.login_data,
+			pSHA1Hash, 16);
+		command->open_client_session.login_type =
+			TF_LOGIN_APPLICATION_GROUP_LINUX_PATH_GID_SHA1_HASH;
+
+		/* 16 bytes */
+		command->open_client_session.message_size += 4;
+		break;
+	}
+#else
+	case TF_LOGIN_APPLICATION_GROUP: {
+		/*
+		 * Check requested GID. Send the real UID and the requested GID
+		 * in the login data. Update message size.
+		 */
+		gid_t requested_gid;
+
+		requested_gid =	*(u32 *) &command->open_client_session.
+			login_data;
+
+		if (!tf_check_gid(requested_gid)) {
+			dprintk(KERN_ERR "tf_open_client_session(%p) "
+			"TF_LOGIN_APPLICATION_GROUP: requested GID (0x%x) "
+			"does not match real eGID (0x%x)"
+			"or any of the supplementary GIDs\n",
+			connection, requested_gid, current_egid());
+			error = -EACCES;
+			goto error;
+		}
+
+		*(u32 *) &command->open_client_session.login_data =
+			current_uid();
+		*(u32 *) &command->open_client_session.login_data[4] =
+			requested_gid;
+
+		command->open_client_session.login_type =
+			TF_LOGIN_APPLICATION_GROUP_ANDROID_UID_GID;
+
+		/* Added two words */
+		command->open_client_session.message_size += 2;
+
+		break;
+	}
+#endif
+
+	case TF_LOGIN_PRIVILEGED:
+		/* A privileged login may be performed only on behalf of the
+		   kernel itself or on behalf of a process with euid=0 or
+		   egid=0 or euid=system or egid=system. */
+		if (connection->owner == TF_CONNECTION_OWNER_KERNEL) {
+			dprintk(KERN_DEBUG "tf_open_client_session: "
+				"TF_LOGIN_PRIVILEGED for kernel API\n");
+		} else if ((current_euid() != TF_PRIVILEGED_UID_GID) &&
+			   (current_egid() != TF_PRIVILEGED_UID_GID) &&
+			   (current_euid() != 0) && (current_egid() != 0)) {
+			dprintk(KERN_ERR "tf_open_client_session: "
+				" user %d, group %d not allowed to open "
+				"session with TF_LOGIN_PRIVILEGED\n",
+				current_euid(), current_egid());
+			error = -EACCES;
+			goto error;
+		} else {
+			dprintk(KERN_DEBUG "tf_open_client_session: "
+				"TF_LOGIN_PRIVILEGED for %u:%u\n",
+				current_euid(), current_egid());
+		}
+		command->open_client_session.login_type =
+			TF_LOGIN_PRIVILEGED;
+		break;
+
+	case TF_LOGIN_AUTHENTICATION: {
+		/*
+		 * Compute SHA-1 hash of the application binary
+		 * Send this hash as the login data (20 bytes)
+		 */
+
+		u8 *hash;
+		hash = &(command->open_client_session.login_data[0]);
+
+		error = tf_get_current_process_hash(hash);
+		if (error != 0) {
+			dprintk(KERN_ERR "tf_open_client_session: "
+				"error in tf_get_current_process_hash\n");
+			goto error;
+		}
+		command->open_client_session.login_type =
+			TF_LOGIN_AUTHENTICATION_BINARY_SHA1_HASH;
+
+		/* 20 bytes */
+		command->open_client_session.message_size += 5;
+		break;
+	}
+
+	case TF_LOGIN_PRIVILEGED_KERNEL:
+		/* A kernel login may be performed only on behalf of the
+		   kernel itself. */
+		if (connection->owner == TF_CONNECTION_OWNER_KERNEL) {
+			dprintk(KERN_DEBUG "tf_open_client_session: "
+				"TF_LOGIN_PRIVILEGED_KERNEL for kernel API\n");
+			command->open_client_session.login_type =
+				TF_LOGIN_PRIVILEGED_KERNEL;
+		} else {
+			dprintk(KERN_ERR "tf_open_client_session: "
+				" user %d, group %d not allowed to open "
+				"session with TF_LOGIN_PRIVILEGED_KERNEL\n",
+				current_euid(), current_egid());
+			error = -EACCES;
+			goto error;
+		}
+		command->open_client_session.login_type =
+			TF_LOGIN_PRIVILEGED_KERNEL;
+		break;
+
+	default:
+		 dprintk(KERN_ERR "tf_open_client_session: "
+			"unknown login_type(%08X)\n",
+			command->open_client_session.login_type);
+		 error = -EOPNOTSUPP;
+		 goto error;
+	}
+
+	/* Map the temporary memory references */
+	for (i = 0; i < 4; i++) {
+		int param_type;
+		param_type = TF_GET_PARAM_TYPE(
+			command->open_client_session.param_types, i);
+		if ((param_type & (TF_PARAM_TYPE_MEMREF_FLAG |
+				   TF_PARAM_TYPE_REGISTERED_MEMREF_FLAG))
+				== TF_PARAM_TYPE_MEMREF_FLAG) {
+			/* Map temp mem ref */
+			error = tf_map_temp_shmem(connection,
+				&command->open_client_session.
+					params[i].temp_memref,
+				param_type,
+				&shmem_desc[i]);
+			if (error != 0) {
+				dprintk(KERN_ERR "tf_open_client_session: "
+					"unable to map temporary memory block "
+					"(%08X)\n", error);
+				goto error;
+			}
+		}
+	}
+
+	/* Fill the handle of the Device Context */
+	command->open_client_session.device_context =
+		connection->device_context;
+
+	error = tf_send_receive(
+		&connection->dev->sm,
+		command,
+		answer,
+		connection,
+		true);
+
+error:
+	/* Unmap the temporary memory references */
+	for (i = 0; i < 4; i++)
+		if (shmem_desc[i] != NULL)
+			tf_unmap_shmem(connection, shmem_desc[i], 0);
+
+	if (error != 0)
+		dprintk(KERN_ERR "tf_open_client_session returns %d\n",
+			error);
+	else
+		dprintk(KERN_ERR "tf_open_client_session returns "
+			"error_code 0x%08X\n",
+			answer->open_client_session.error_code);
+
+	return error;
+}
+
+
+/*
+ * Closes a client session from the Secure World
+ */
+int tf_close_client_session(
+	struct tf_connection *connection,
+	union tf_command *command,
+	union tf_answer *answer)
+{
+	int error = 0;
+
+	dprintk(KERN_DEBUG "tf_close_client_session(%p)\n", connection);
+
+	command->close_client_session.message_size =
+		(sizeof(struct tf_command_close_client_session) -
+			sizeof(struct tf_command_header)) / 4;
+	command->close_client_session.device_context =
+		connection->device_context;
+
+	error = tf_send_receive(
+		&connection->dev->sm,
+		command,
+		answer,
+		connection,
+		true);
+
+	if (error != 0)
+		dprintk(KERN_ERR "tf_close_client_session returns %d\n",
+			error);
+	else
+		dprintk(KERN_ERR "tf_close_client_session returns "
+			"error 0x%08X\n",
+			answer->close_client_session.error_code);
+
+	return error;
+}
+
+
+/*
+ * Registers a shared memory to the Secure World
+ */
+int tf_register_shared_memory(
+	struct tf_connection *connection,
+	union tf_command *command,
+	union tf_answer *answer)
+{
+	int error = 0;
+	struct tf_shmem_desc *shmem_desc = NULL;
+	bool in_user_space = connection->owner != TF_CONNECTION_OWNER_KERNEL;
+	struct tf_command_register_shared_memory *msg =
+		&command->register_shared_memory;
+
+	dprintk(KERN_INFO "tf_register_shared_memory(%p) "
+		"%p[0x%08X][0x%08x]\n",
+		connection,
+		(void *)msg->shared_mem_descriptors[0],
+		msg->shared_mem_size,
+		(u32)msg->memory_flags);
+
+	if (in_user_space) {
+		error = tf_validate_shmem_and_flags(
+			msg->shared_mem_descriptors[0],
+			msg->shared_mem_size,
+			(u32)msg->memory_flags);
+		if (error != 0)
+			goto error;
+	}
+
+	/* Initialize message_size with no descriptors */
+	msg->message_size
+		= (offsetof(struct tf_command_register_shared_memory,
+						shared_mem_descriptors) -
+			sizeof(struct tf_command_header)) / 4;
+
+	/* Map the shmem block and update the message */
+	if (msg->shared_mem_size == 0) {
+		/* Empty shared mem */
+		msg->shared_mem_start_offset = msg->shared_mem_descriptors[0];
+	} else {
+		u32 descriptor_count;
+		error = tf_map_shmem(
+			connection,
+			msg->shared_mem_descriptors[0],
+			msg->memory_flags,
+			in_user_space,
+			msg->shared_mem_descriptors,
+			&(msg->shared_mem_start_offset),
+			msg->shared_mem_size,
+			&shmem_desc,
+			&descriptor_count);
+		if (error != 0) {
+			dprintk(KERN_ERR "tf_register_shared_memory: "
+				"unable to map shared memory block\n");
+			goto error;
+		}
+		msg->message_size += descriptor_count;
+	}
+
+	/*
+	 * write the correct device context handle and the address of the shared
+	 * memory descriptor in the message
+	 */
+	msg->device_context = connection->device_context;
+	msg->block_id = (u32)shmem_desc;
+
+	/* Send the updated message */
+	error = tf_send_receive(
+		&connection->dev->sm,
+		command,
+		answer,
+		connection,
+		true);
+
+	if ((error != 0) ||
+		(answer->register_shared_memory.error_code
+			!= S_SUCCESS)) {
+		dprintk(KERN_ERR "tf_register_shared_memory: "
+			"operation failed. Unmap block\n");
+		goto error;
+	}
+
+	/* Saves the block handle returned by the secure world */
+	if (shmem_desc != NULL)
+		shmem_desc->block_identifier =
+			answer->register_shared_memory.block;
+
+	/* successful completion */
+	dprintk(KERN_INFO "tf_register_shared_memory(%p):"
+		" block_id=0x%08x block=0x%08x\n",
+		connection, msg->block_id,
+		answer->register_shared_memory.block);
+	return 0;
+
+	/* error completion */
+error:
+	tf_unmap_shmem(
+		connection,
+		shmem_desc,
+		0);
+
+	if (error != 0)
+		dprintk(KERN_ERR "tf_register_shared_memory returns %d\n",
+			error);
+	else
+		dprintk(KERN_ERR "tf_register_shared_memory returns "
+			"error_code 0x%08X\n",
+			answer->register_shared_memory.error_code);
+
+	return error;
+}
+
+
+/*
+ * Releases a shared memory from the Secure World
+ */
+int tf_release_shared_memory(
+	struct tf_connection *connection,
+	union tf_command *command,
+	union tf_answer *answer)
+{
+	int error = 0;
+
+	dprintk(KERN_DEBUG "tf_release_shared_memory(%p)\n", connection);
+
+	command->release_shared_memory.message_size =
+		(sizeof(struct tf_command_release_shared_memory) -
+			sizeof(struct tf_command_header)) / 4;
+	command->release_shared_memory.device_context =
+		connection->device_context;
+
+	error = tf_send_receive(
+		&connection->dev->sm,
+		command,
+		answer,
+		connection,
+		true);
+
+	if ((error != 0) ||
+		(answer->release_shared_memory.error_code != S_SUCCESS))
+		goto error;
+
+	/* Use block_id to get back the pointer to shmem_desc */
+	tf_unmap_shmem(
+		connection,
+		(struct tf_shmem_desc *)
+			answer->release_shared_memory.block_id,
+		0);
+
+	/* successful completion */
+	dprintk(KERN_INFO "tf_release_shared_memory(%p):"
+		" block_id=0x%08x block=0x%08x\n",
+		connection, answer->release_shared_memory.block_id,
+		command->release_shared_memory.block);
+	return 0;
+
+
+error:
+	if (error != 0)
+		dprintk(KERN_ERR "tf_release_shared_memory returns %d\n",
+			error);
+	else
+		dprintk(KERN_ERR "tf_release_shared_memory returns "
+			"nChannelStatus 0x%08X\n",
+			answer->release_shared_memory.error_code);
+
+	return error;
+
+}
+
+
+/*
+ * Invokes a client command to the Secure World
+ */
+int tf_invoke_client_command(
+	struct tf_connection *connection,
+	union tf_command *command,
+	union tf_answer *answer)
+{
+	int error = 0;
+	struct tf_shmem_desc *shmem_desc[4] = {NULL};
+	int i;
+
+	dprintk(KERN_INFO "tf_invoke_client_command(%p)\n", connection);
+
+	command->release_shared_memory.message_size =
+		(sizeof(struct tf_command_invoke_client_command) -
+			sizeof(struct tf_command_header)) / 4;
+
+#ifdef CONFIG_TF_ZEBRA
+	error = tf_crypto_try_shortcuted_update(connection,
+		(struct tf_command_invoke_client_command *) command,
+		(struct tf_answer_invoke_client_command *) answer);
+	if (error == 0)
+		return error;
+#endif
+
+	/* Map the tmprefs */
+	for (i = 0; i < 4; i++) {
+		int param_type = TF_GET_PARAM_TYPE(
+			command->invoke_client_command.param_types, i);
+		if ((param_type & (TF_PARAM_TYPE_MEMREF_FLAG |
+				   TF_PARAM_TYPE_REGISTERED_MEMREF_FLAG))
+				== TF_PARAM_TYPE_MEMREF_FLAG) {
+			/* A temporary memref: map it */
+			error = tf_map_temp_shmem(connection,
+					&command->invoke_client_command.
+						params[i].temp_memref,
+					param_type, &shmem_desc[i]);
+			if (error != 0) {
+				dprintk(KERN_ERR
+					"tf_invoke_client_command: "
+					"unable to map temporary memory "
+					"block\n (%08X)", error);
+				goto error;
+			}
+		}
+	}
+
+	command->invoke_client_command.device_context =
+		connection->device_context;
+
+	error = tf_send_receive(&connection->dev->sm, command,
+		answer, connection, true);
+
+error:
+	/* Unmap de temp mem refs */
+	for (i = 0; i < 4; i++) {
+		if (shmem_desc[i] != NULL) {
+			dprintk(KERN_INFO "tf_invoke_client_command: "
+				"UnMatemp_memref %d\n ", i);
+			tf_unmap_shmem(connection, shmem_desc[i], 0);
+		}
+	}
+
+	if (error != 0)
+		dprintk(KERN_ERR "tf_invoke_client_command returns %d\n",
+			error);
+	else
+		dprintk(KERN_ERR "tf_invoke_client_command returns "
+			"error_code 0x%08X\n",
+			answer->invoke_client_command.error_code);
+
+	return error;
+}
+
+
+/*
+ * Cancels a client command from the Secure World
+ */
+int tf_cancel_client_command(
+	struct tf_connection *connection,
+	union tf_command *command,
+	union tf_answer *answer)
+{
+	int error = 0;
+
+	dprintk(KERN_DEBUG "tf_cancel_client_command(%p)\n", connection);
+
+	command->cancel_client_operation.device_context =
+		connection->device_context;
+	command->cancel_client_operation.message_size =
+		(sizeof(struct tf_command_cancel_client_operation) -
+			sizeof(struct tf_command_header)) / 4;
+
+	error = tf_send_receive(
+		&connection->dev->sm,
+		command,
+		answer,
+		connection,
+		true);
+
+	if ((error != 0) ||
+		(answer->cancel_client_operation.error_code != S_SUCCESS))
+		goto error;
+
+
+	/* successful completion */
+	return 0;
+
+error:
+	if (error != 0)
+		dprintk(KERN_ERR "tf_cancel_client_command returns %d\n",
+			error);
+	else
+		dprintk(KERN_ERR "tf_cancel_client_command returns "
+			"nChannelStatus 0x%08X\n",
+			answer->cancel_client_operation.error_code);
+
+	return error;
+}
+
+
+
+/*
+ * Destroys a device context from the Secure World
+ */
+int tf_destroy_device_context(
+	struct tf_connection *connection)
+{
+	int error;
+	/*
+	 * AFY: better use the specialized tf_command_destroy_device_context
+	 * structure: this will save stack
+	 */
+	union tf_command command;
+	union tf_answer answer;
+
+	dprintk(KERN_INFO "tf_destroy_device_context(%p)\n", connection);
+
+	BUG_ON(connection == NULL);
+
+	command.header.message_type = TF_MESSAGE_TYPE_DESTROY_DEVICE_CONTEXT;
+	command.header.message_size =
+		(sizeof(struct tf_command_destroy_device_context) -
+			sizeof(struct tf_command_header))/sizeof(u32);
+
+	/*
+	 * fill in the device context handler
+	 * it is guarantied that the first shared memory descriptor describes
+	 * the device context
+	 */
+	command.destroy_device_context.device_context =
+		connection->device_context;
+
+	error = tf_send_receive(
+		&connection->dev->sm,
+		&command,
+		&answer,
+		connection,
+		false);
+
+	if ((error != 0) ||
+		(answer.destroy_device_context.error_code != S_SUCCESS))
+		goto error;
+
+	spin_lock(&(connection->state_lock));
+	connection->state = TF_CONN_STATE_NO_DEVICE_CONTEXT;
+	spin_unlock(&(connection->state_lock));
+
+	/* successful completion */
+	dprintk(KERN_INFO "tf_destroy_device_context(%p)\n",
+		connection);
+	return 0;
+
+error:
+	if (error != 0) {
+		dprintk(KERN_ERR "tf_destroy_device_context failed with "
+			"error %d\n", error);
+	} else {
+		dprintk(KERN_ERR "tf_destroy_device_context failed with "
+			"error_code 0x%08X\n",
+			answer.destroy_device_context.error_code);
+		if (answer.destroy_device_context.error_code ==
+			S_ERROR_OUT_OF_MEMORY)
+			error = -ENOMEM;
+		else
+			error = -EFAULT;
+	}
+
+	return error;
+}
+
+
+/*----------------------------------------------------------------------------
+ * Connection initialization and cleanup operations
+ *----------------------------------------------------------------------------*/
+
+/*
+ * Opens a connection to the specified device.
+ *
+ * The placeholder referenced by connection is set to the address of the
+ * new connection; it is set to NULL upon failure.
+ *
+ * Returns zero upon successful completion, or an appropriate error code upon
+ * failure.
+ */
+int tf_open(struct tf_device *dev,
+	struct file *file,
+	struct tf_connection **connection)
+{
+	int error;
+	struct tf_connection *conn = NULL;
+
+	dprintk(KERN_INFO "tf_open(%p, %p)\n", file, connection);
+
+	/*
+	 * Allocate and initialize the conn.
+	 * kmalloc only allocates sizeof(*conn) virtual memory
+	 */
+	conn = (struct tf_connection *) internal_kmalloc(sizeof(*conn),
+		GFP_KERNEL);
+	if (conn == NULL) {
+		printk(KERN_ERR "tf_open(): "
+			"Out of memory for conn!\n");
+		error = -ENOMEM;
+		goto error;
+	}
+
+	memset(conn, 0, sizeof(*conn));
+
+	conn->state = TF_CONN_STATE_NO_DEVICE_CONTEXT;
+	conn->dev = dev;
+	spin_lock_init(&(conn->state_lock));
+	atomic_set(&(conn->pending_op_count), 0);
+	INIT_LIST_HEAD(&(conn->list));
+
+	/*
+	 * Initialize the shared memory
+	 */
+	error = tf_init_shared_memory(conn);
+	if (error != 0)
+		goto error;
+
+#ifdef CONFIG_TF_ZEBRA
+	/*
+	 * Initialize CUS specifics
+	 */
+	tf_crypto_init_cus(conn);
+#endif
+
+	/*
+	 * Attach the conn to the device.
+	 */
+	spin_lock(&(dev->connection_list_lock));
+	list_add(&(conn->list), &(dev->connection_list));
+	spin_unlock(&(dev->connection_list_lock));
+
+	/*
+	 * Successful completion.
+	 */
+
+	*connection = conn;
+
+	dprintk(KERN_INFO "tf_open(): Success (conn=%p)\n", conn);
+	return 0;
+
+	/*
+	 * Error handling.
+	 */
+
+error:
+	dprintk(KERN_ERR "tf_open(): Failure (error %d)\n", error);
+	/* Deallocate the descriptor pages if necessary */
+	internal_kfree(conn);
+	*connection = NULL;
+	return error;
+}
+
+
+/*
+ * Closes the specified connection.
+ *
+ * Upon return, the connection has been destroyed and cannot be used anymore.
+ *
+ * This function does nothing if connection is set to NULL.
+ */
+void tf_close(struct tf_connection *connection)
+{
+	int error;
+	enum TF_CONN_STATE state;
+
+	dprintk(KERN_DEBUG "tf_close(%p)\n", connection);
+
+	if (connection == NULL)
+		return;
+
+	/*
+	 * Assumption: Linux guarantees that no other operation is in progress
+	 * and that no other operation will be started when close is called
+	 */
+	BUG_ON(atomic_read(&(connection->pending_op_count)) != 0);
+
+	/*
+	 * Exchange a Destroy Device Context message if needed.
+	 */
+	spin_lock(&(connection->state_lock));
+	state = connection->state;
+	spin_unlock(&(connection->state_lock));
+	if (state == TF_CONN_STATE_VALID_DEVICE_CONTEXT) {
+		/*
+		 * A DestroyDeviceContext operation was not performed. Do it
+		 * now.
+		 */
+		error = tf_destroy_device_context(connection);
+		if (error != 0)
+			/* avoid cleanup if destroy device context fails */
+			goto error;
+	}
+
+	/*
+	 * Clean up the shared memory
+	 */
+	tf_cleanup_shared_memories(connection);
+
+	spin_lock(&(connection->dev->connection_list_lock));
+	list_del(&(connection->list));
+	spin_unlock(&(connection->dev->connection_list_lock));
+
+	internal_kfree(connection);
+
+	return;
+
+error:
+	dprintk(KERN_DEBUG "tf_close(%p) failed with error code %d\n",
+		connection, error);
+}
+
diff --git a/security/tf_driver/tf_conn.h b/security/tf_driver/tf_conn.h
new file mode 100644
index 000000000000..8bed16f19d5f
--- /dev/null
+++ b/security/tf_driver/tf_conn.h
@@ -0,0 +1,106 @@
+/**
+ * Copyright (c) 2011 Trusted Logic S.A.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef __TF_CONN_H__
+#define __TF_CONN_H__
+
+#include "tf_defs.h"
+
+/*
+ * Returns a pointer to the connection referenced by the
+ * specified file.
+ */
+static inline struct tf_connection *tf_conn_from_file(
+	struct file *file)
+{
+	return file->private_data;
+}
+
+int tf_validate_shmem_and_flags(u32 shmem, u32 shmem_size, u32 flags);
+
+int tf_map_shmem(
+		struct tf_connection *connection,
+		u32 buffer,
+		/* flags for read-write access rights on the memory */
+		u32 flags,
+		bool in_user_space,
+		u32 descriptors[TF_MAX_COARSE_PAGES],
+		u32 *buffer_start_offset,
+		u32 buffer_size,
+		struct tf_shmem_desc **shmem_desc,
+		u32 *descriptor_count);
+
+void tf_unmap_shmem(
+		struct tf_connection *connection,
+		struct tf_shmem_desc *shmem_desc,
+		u32 full_cleanup);
+
+/*----------------------------------------------------------------------------
+ * Connection operations to the Secure World
+ *----------------------------------------------------------------------------*/
+
+int tf_create_device_context(
+	 struct tf_connection *connection);
+
+int tf_destroy_device_context(
+	struct tf_connection *connection);
+
+int tf_open_client_session(
+	struct tf_connection *connection,
+	union tf_command *command,
+	union tf_answer *answer);
+
+int tf_close_client_session(
+	struct tf_connection *connection,
+	union tf_command *command,
+	union tf_answer *answer);
+
+int tf_register_shared_memory(
+	struct tf_connection *connection,
+	union tf_command *command,
+	union tf_answer *answer);
+
+int tf_release_shared_memory(
+	struct tf_connection *connection,
+	union tf_command *command,
+	union tf_answer *answer);
+
+int tf_invoke_client_command(
+	struct tf_connection *connection,
+	union tf_command *command,
+	union tf_answer *answer);
+
+int tf_cancel_client_command(
+	struct tf_connection *connection,
+	union tf_command *command,
+	union tf_answer *answer);
+
+/*----------------------------------------------------------------------------
+ * Connection initialization and cleanup operations
+ *----------------------------------------------------------------------------*/
+
+int tf_open(struct tf_device *dev,
+	struct file *file,
+	struct tf_connection **connection);
+
+void tf_close(
+	struct tf_connection *connection);
+
+
+#endif  /* !defined(__TF_CONN_H__) */
diff --git a/security/tf_driver/tf_defs.h b/security/tf_driver/tf_defs.h
new file mode 100644
index 000000000000..ac209370c55d
--- /dev/null
+++ b/security/tf_driver/tf_defs.h
@@ -0,0 +1,538 @@
+/**
+ * Copyright (c) 2011 Trusted Logic S.A.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef __TF_DEFS_H__
+#define __TF_DEFS_H__
+
+#include <linux/atomic.h>
+#include <linux/version.h>
+#include <linux/fs.h>
+#include <linux/cdev.h>
+#include <linux/completion.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/sysfs.h>
+#include <linux/sched.h>
+#include <linux/semaphore.h>
+#ifdef CONFIG_HAS_WAKELOCK
+#include <linux/wakelock.h>
+#endif
+
+#include "tf_protocol.h"
+
+/*----------------------------------------------------------------------------*/
+
+#define SIZE_1KB 0x400
+
+/*
+ * Maximum number of shared memory blocks that can be reigsters in a connection
+ */
+#define TF_SHMEM_MAX_COUNT   (64)
+
+/*
+ * Describes the possible types of shared memories
+ *
+ * TF_SHMEM_TYPE_PREALLOC_REGISTERED_SHMEM :
+ *    The descriptor describes a registered shared memory.
+ *    Its coarse pages are preallocated when initializing the
+ *    connection
+ * TF_SHMEM_TYPE_REGISTERED_SHMEM :
+ *    The descriptor describes a registered shared memory.
+ *    Its coarse pages are not preallocated
+ * TF_SHMEM_TYPE_PM_HIBERNATE :
+ *    The descriptor describes a power management shared memory.
+ */
+enum TF_SHMEM_TYPE {
+	TF_SHMEM_TYPE_PREALLOC_REGISTERED_SHMEM = 0,
+	TF_SHMEM_TYPE_REGISTERED_SHMEM,
+	TF_SHMEM_TYPE_PM_HIBERNATE,
+};
+
+
+/*
+ * This structure contains a pointer on a coarse page table
+ */
+struct tf_coarse_page_table {
+	/*
+	 * Identifies the coarse page table descriptor in
+	 * free_coarse_page_tables list
+	 */
+	struct list_head list;
+
+	/*
+	 * The address of the coarse page table
+	 */
+	u32 *descriptors;
+
+	/*
+	 * The address of the array containing this coarse page table
+	 */
+	struct tf_coarse_page_table_array *parent;
+};
+
+
+#define TF_PAGE_DESCRIPTOR_TYPE_NORMAL       0
+#define TF_PAGE_DESCRIPTOR_TYPE_PREALLOCATED 1
+
+/*
+ * This structure describes an array of up to 4 coarse page tables
+ * allocated within a single 4KB page.
+ */
+struct tf_coarse_page_table_array {
+	/*
+	 * identifies the element in the coarse_page_table_arrays list
+	 */
+	struct list_head list;
+
+	/*
+	 * Type of page descriptor
+	 * can take any of TF_PAGE_DESCRIPTOR_TYPE_XXX value
+	 */
+	u32 type;
+
+	struct tf_coarse_page_table coarse_page_tables[4];
+
+	/*
+	 * A counter of the number of coarse pages currently used
+	 * the max value should be 4 (one coarse page table is 1KB while one
+	 * page is 4KB)
+	 */
+	u8 ref_count;
+};
+
+
+/*
+ * This structure describes a list of coarse page table arrays
+ * with some of the coarse page tables free. It is used
+ * when the driver needs to allocate a new coarse page
+ * table.
+ */
+struct tf_coarse_page_table_allocation_context {
+	/*
+	 * The spin lock protecting concurrent access to the structure.
+	 */
+	spinlock_t lock;
+
+	/*
+	 * The list of allocated coarse page table arrays
+	 */
+	struct list_head coarse_page_table_arrays;
+
+	/*
+	 * The list of free coarse page tables
+	 */
+	struct list_head free_coarse_page_tables;
+};
+
+
+/*
+ * Fully describes a shared memory block
+ */
+struct tf_shmem_desc {
+	/*
+	 * Identifies the shared memory descriptor in the list of free shared
+	 * memory descriptors
+	 */
+	struct list_head list;
+
+	/*
+	 * Identifies the type of shared memory descriptor
+	 */
+	enum TF_SHMEM_TYPE type;
+
+	/*
+	 * The identifier of the block of shared memory, as returned by the
+	 * Secure World.
+	 * This identifier is block field of a REGISTER_SHARED_MEMORY answer
+	 */
+	u32 block_identifier;
+
+	/* Client buffer */
+	u8 *client_buffer;
+
+	/* Up to eight coarse page table context */
+	struct tf_coarse_page_table *coarse_pg_table[TF_MAX_COARSE_PAGES];
+
+	u32 coarse_pg_table_count;
+
+	/* Reference counter */
+	atomic_t ref_count;
+};
+
+
+/*----------------------------------------------------------------------------*/
+
+/*
+ * This structure describes the communication with the Secure World
+ *
+ * Note that this driver supports only one instance of the Secure World
+ */
+struct tf_comm {
+	/*
+	 * The spin lock protecting concurrent access to the structure.
+	 */
+	spinlock_t lock;
+
+	/*
+	 * Bit vector with the following possible flags:
+	 *    - TF_COMM_FLAG_IRQ_REQUESTED: If set, indicates that
+	 *      the IRQ has been successfuly requested.
+	 *    - TF_COMM_FLAG_TERMINATING: If set, indicates that the
+	 *      communication with the Secure World is being terminated.
+	 *      Transmissions to the Secure World are not permitted
+	 *    - TF_COMM_FLAG_W3B_ALLOCATED: If set, indicates that the
+	 *      W3B buffer has been allocated.
+	 *
+	 * This bit vector must be accessed with the kernel's atomic bitwise
+	 * operations.
+	 */
+	unsigned long flags;
+
+	/*
+	 * The virtual address of the L1 shared buffer.
+	 */
+	struct tf_l1_shared_buffer *l1_buffer;
+
+	/*
+	 * The wait queue the client threads are waiting on.
+	 */
+	wait_queue_head_t wait_queue;
+
+#ifdef CONFIG_TF_TRUSTZONE
+	/*
+	 * The interrupt line used by the Secure World.
+	 */
+	int soft_int_irq;
+
+	/* ----- W3B ----- */
+	/* shared memory descriptor to identify the W3B */
+	struct tf_shmem_desc w3b_shmem_desc;
+
+	/* Virtual address of the kernel allocated shared memory */
+	u32 w3b;
+
+	/* offset of data in shared memory coarse pages */
+	u32 w3b_shmem_offset;
+
+	u32 w3b_shmem_size;
+
+	struct tf_coarse_page_table_allocation_context
+		w3b_cpt_alloc_context;
+#endif
+#ifdef CONFIG_TF_ZEBRA
+	/*
+	 * The SE SDP can only be initialized once...
+	 */
+	int se_initialized;
+
+	/*
+	 * Lock to be held by a client when executing an RPC
+	 */
+	struct mutex rpc_mutex;
+
+	/*
+	 * Lock to protect concurrent accesses to DMA channels
+	 */
+	struct mutex dma_mutex;
+#endif
+};
+
+
+#define TF_COMM_FLAG_IRQ_REQUESTED		(0)
+#define TF_COMM_FLAG_PA_AVAILABLE		(1)
+#define TF_COMM_FLAG_TERMINATING		(2)
+#define TF_COMM_FLAG_W3B_ALLOCATED		(3)
+#define TF_COMM_FLAG_L1_SHARED_ALLOCATED	(4)
+
+/*----------------------------------------------------------------------------*/
+
+struct tf_device_stats {
+	atomic_t stat_pages_allocated;
+	atomic_t stat_memories_allocated;
+	atomic_t stat_pages_locked;
+};
+
+/*
+ * This structure describes the information about one device handled by the
+ * driver. Note that the driver supports only a single device. see the global
+ * variable g_tf_dev
+
+ */
+struct tf_device {
+	/*
+	 * The kernel object for the device
+	 */
+	struct kobject kobj;
+
+	/*
+	 * The device number for the device.
+	 */
+	dev_t dev_number;
+
+	/*
+	 * Interfaces the char device with the kernel.
+	 */
+	struct cdev cdev;
+
+#ifdef CONFIG_TF_TEEC
+	struct cdev cdev_teec;
+#endif
+
+#ifdef CONFIG_TF_ZEBRA
+	struct cdev cdev_ctrl;
+
+	/*
+	 * Globals for CUS
+	 */
+	/* Current key handles loaded in HWAs */
+	u32 aes1_key_context;
+	u32 des_key_context;
+	bool sham1_is_public;
+
+	/* Object used to serialize HWA accesses */
+	struct semaphore aes1_sema;
+	struct semaphore des_sema;
+	struct semaphore sha_sema;
+
+	/*
+	 * An aligned and correctly shaped pre-allocated buffer used for DMA
+	 * transfers
+	 */
+	u32 dma_buffer_length;
+	u8 *dma_buffer;
+	dma_addr_t dma_buffer_phys;
+
+	/* Workspace allocated at boot time and reserved to the Secure World */
+	u32 workspace_addr;
+	u32 workspace_size;
+
+	/*
+	* A Mutex to provide exclusive locking of the ioctl()
+	*/
+	struct mutex dev_mutex;
+#endif
+
+	/*
+	 * Communications with the SM.
+	 */
+	struct tf_comm sm;
+
+	/*
+	 * Lists the connections attached to this device.  A connection is
+	 * created each time a user space application "opens" a file descriptor
+	 * on the driver
+	 */
+	struct list_head connection_list;
+
+	/*
+	 * The spin lock used to protect concurrent access to the connection
+	 * list.
+	 */
+	spinlock_t connection_list_lock;
+
+	struct tf_device_stats stats;
+};
+
+/*----------------------------------------------------------------------------*/
+/*
+ * This type describes a connection state.
+ * This is used to determine whether a message is valid or not.
+ *
+ * Messages are only valid in a certain device state.
+ * Messages may be invalidated between the start of the ioctl call and the
+ * moment the message is sent to the Secure World.
+ *
+ * TF_CONN_STATE_NO_DEVICE_CONTEXT :
+ *    The connection has no DEVICE_CONTEXT created and no
+ *    CREATE_DEVICE_CONTEXT being processed by the Secure World
+ * TF_CONN_STATE_CREATE_DEVICE_CONTEXT_SENT :
+ *    The connection has a CREATE_DEVICE_CONTEXT being processed by the Secure
+ *    World
+ * TF_CONN_STATE_VALID_DEVICE_CONTEXT :
+ *    The connection has a DEVICE_CONTEXT created and no
+ *    DESTROY_DEVICE_CONTEXT is being processed by the Secure World
+ * TF_CONN_STATE_DESTROY_DEVICE_CONTEXT_SENT :
+ *    The connection has a DESTROY_DEVICE_CONTEXT being processed by the Secure
+ *    World
+ */
+enum TF_CONN_STATE {
+	TF_CONN_STATE_NO_DEVICE_CONTEXT = 0,
+	TF_CONN_STATE_CREATE_DEVICE_CONTEXT_SENT,
+	TF_CONN_STATE_VALID_DEVICE_CONTEXT,
+	TF_CONN_STATE_DESTROY_DEVICE_CONTEXT_SENT
+};
+
+
+/*
+ *  This type describes the  status of the command.
+ *
+ *  PENDING:
+ *     The initial state; the command has not been sent yet.
+ *	SENT:
+ *     The command has been sent, we are waiting for an answer.
+ *	ABORTED:
+ *     The command cannot be sent because the device context is invalid.
+ *     Note that this only covers the case where some other thread
+ *     sent a DESTROY_DEVICE_CONTEXT command.
+ */
+enum TF_COMMAND_STATE {
+	TF_COMMAND_STATE_PENDING = 0,
+	TF_COMMAND_STATE_SENT,
+	TF_COMMAND_STATE_ABORTED
+};
+
+/*
+ * The origin of connection parameters such as login data and
+ * memory reference pointers.
+ *
+ * PROCESS: the calling process. All arguments must be validated.
+ * KERNEL: kernel code. All arguments can be trusted by this driver.
+ */
+enum TF_CONNECTION_OWNER {
+	TF_CONNECTION_OWNER_PROCESS = 0,
+	TF_CONNECTION_OWNER_KERNEL,
+};
+
+
+/*
+ * This structure describes a connection to the driver
+ * A connection is created each time an application opens a file descriptor on
+ * the driver
+ */
+struct tf_connection {
+	/*
+	 * Identifies the connection in the list of the connections attached to
+	 * the same device.
+	 */
+	struct list_head list;
+
+	/*
+	 * State of the connection.
+	 */
+	enum TF_CONN_STATE state;
+
+	/*
+	 * A pointer to the corresponding device structure
+	 */
+	struct tf_device *dev;
+
+	/*
+	 * A spinlock to use to access state
+	 */
+	spinlock_t state_lock;
+
+	/*
+	 * Counts the number of operations currently pending on the connection.
+	 * (for debug only)
+	 */
+	atomic_t pending_op_count;
+
+	/*
+	 * A handle for the device context
+	 */
+	 u32 device_context;
+
+	/*
+	 * Lists the used shared memory descriptors
+	 */
+	struct list_head used_shmem_list;
+
+	/*
+	 * Lists the free shared memory descriptors
+	 */
+	struct list_head free_shmem_list;
+
+	/*
+	 * A mutex to use to access this structure
+	 */
+	struct mutex shmem_mutex;
+
+	/*
+	 * Counts the number of shared memories registered.
+	 */
+	atomic_t shmem_count;
+
+	/*
+	 * Page to retrieve memory properties when
+	 * registering shared memory through REGISTER_SHARED_MEMORY
+	 * messages
+	 */
+	struct vm_area_struct **vmas;
+
+	/*
+	 * coarse page table allocation context
+	 */
+	struct tf_coarse_page_table_allocation_context cpt_alloc_context;
+
+	/* The origin of connection parameters such as login data and
+	   memory reference pointers. */
+	enum TF_CONNECTION_OWNER owner;
+
+#ifdef CONFIG_TF_ZEBRA
+	/* Lists all the Cryptoki Update Shortcuts */
+	struct list_head shortcut_list;
+
+	/* Lock to protect concurrent accesses to shortcut_list */
+	spinlock_t shortcut_list_lock;
+#endif
+};
+
+/*----------------------------------------------------------------------------*/
+
+/*
+ * The operation_id field of a message points to this structure.
+ * It is used to identify the thread that triggered the message transmission
+ * Whoever reads an answer can wake up that thread using the completion event
+ */
+struct tf_answer_struct {
+	bool answer_copied;
+	union tf_answer *answer;
+};
+
+/*----------------------------------------------------------------------------*/
+
+/**
+ * The ASCII-C string representation of the base name of the devices managed by
+ * this driver.
+ */
+#define TF_DEVICE_BASE_NAME	"tf_driver"
+
+
+/**
+ * The major and minor numbers of the registered character device driver.
+ * Only 1 instance of the driver is supported.
+ */
+#define TF_DEVICE_MINOR_NUMBER	(0)
+
+struct tf_device *tf_get_device(void);
+
+#define CLEAN_CACHE_CFG_MASK	(~0xC) /* 1111 0011 */
+
+/*----------------------------------------------------------------------------*/
+/*
+ * Kernel Differences
+ */
+
+#ifdef CONFIG_ANDROID
+#define GROUP_INFO		get_current_groups()
+#else
+#define GROUP_INFO		(current->group_info)
+#endif
+
+#endif  /* !defined(__TF_DEFS_H__) */
diff --git a/security/tf_driver/tf_device.c b/security/tf_driver/tf_device.c
new file mode 100644
index 000000000000..47ff39e6561d
--- /dev/null
+++ b/security/tf_driver/tf_device.c
@@ -0,0 +1,827 @@
+/**
+ * Copyright (c) 2011 Trusted Logic S.A.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <linux/atomic.h>
+#include <linux/uaccess.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/mm.h>
+#include <linux/page-flags.h>
+#include <linux/pm.h>
+#include <linux/sysdev.h>
+#include <linux/vmalloc.h>
+#include <linux/signal.h>
+#ifdef CONFIG_ANDROID
+#include <linux/device.h>
+#endif
+
+#include "tf_protocol.h"
+#include "tf_defs.h"
+#include "tf_util.h"
+#include "tf_conn.h"
+#include "tf_comm.h"
+#ifdef CONFIG_TF_ZEBRA
+#include <plat/cpu.h>
+#include "tf_zebra.h"
+#endif
+#ifdef CONFIG_TF_DRIVER_CRYPTO_FIPS
+#include "tf_crypto.h"
+#endif
+
+#include "s_version.h"
+
+/*----------------------------------------------------------------------------
+ * Forward Declarations
+ *----------------------------------------------------------------------------*/
+
+/*
+ * Creates and registers the device to be managed by the specified driver.
+ *
+ * Returns zero upon successful completion, or an appropriate error code upon
+ * failure.
+ */
+static int tf_device_register(void);
+
+
+/*
+ * Implements the device Open callback.
+ */
+static int tf_device_open(
+		struct inode *inode,
+		struct file *file);
+
+
+/*
+ * Implements the device Release callback.
+ */
+static int tf_device_release(
+		struct inode *inode,
+		struct file *file);
+
+
+/*
+ * Implements the device ioctl callback.
+ */
+static long tf_device_ioctl(
+		struct file *file,
+		unsigned int ioctl_num,
+		unsigned long ioctl_param);
+
+
+/*
+ * Implements the device shutdown callback.
+ */
+static int tf_device_shutdown(
+		struct sys_device *sysdev);
+
+
+/*
+ * Implements the device suspend callback.
+ */
+static int tf_device_suspend(
+		struct sys_device *sysdev,
+		pm_message_t state);
+
+
+/*
+ * Implements the device resume callback.
+ */
+static int tf_device_resume(
+		struct sys_device *sysdev);
+
+
+/*---------------------------------------------------------------------------
+ * Module Parameters
+ *---------------------------------------------------------------------------*/
+
+/*
+ * The device major number used to register a unique character device driver.
+ * Let the default value be 122
+ */
+static int device_major_number = 122;
+
+module_param(device_major_number, int, 0000);
+MODULE_PARM_DESC(device_major_number,
+	"The device major number used to register a unique character "
+	"device driver");
+
+#ifdef CONFIG_TF_TRUSTZONE
+/**
+ * The softint interrupt line used by the Secure World.
+ */
+static int soft_interrupt = -1;
+
+module_param(soft_interrupt, int, 0000);
+MODULE_PARM_DESC(soft_interrupt,
+	"The softint interrupt line used by the Secure world");
+#endif
+
+#ifdef CONFIG_TF_DRIVER_DEBUG_SUPPORT
+unsigned tf_debug_level = UINT_MAX;
+module_param_named(debug, tf_debug_level, uint, 0644);
+#endif
+
+#ifdef CONFIG_TF_DRIVER_CRYPTO_FIPS
+char *tf_integrity_hmac_sha256_expected_value;
+module_param_named(hmac_sha256, tf_integrity_hmac_sha256_expected_value,
+		   charp, 0444);
+
+#ifdef CONFIG_TF_DRIVER_FAULT_INJECTION
+unsigned tf_fault_injection_mask;
+module_param_named(fault, tf_fault_injection_mask, uint, 0644);
+#endif
+
+int tf_self_test_blkcipher_align;
+module_param_named(post_align, tf_self_test_blkcipher_align, int, 0644);
+int tf_self_test_blkcipher_use_vmalloc;
+module_param_named(post_vmalloc, tf_self_test_blkcipher_use_vmalloc, int, 0644);
+#endif
+
+#ifdef CONFIG_ANDROID
+static struct class *tf_class;
+#endif
+
+/*
+ * Interfaces the system device with the kernel.
+ */
+struct sys_device g_tf_sysdev;
+
+/*----------------------------------------------------------------------------
+ * Global Variables
+ *----------------------------------------------------------------------------*/
+
+/*
+ * tf_driver character device definitions.
+ * read and write methods are not defined
+ * and will return an error if used by user space
+ */
+static const struct file_operations g_tf_device_file_ops = {
+	.owner = THIS_MODULE,
+	.open = tf_device_open,
+	.release = tf_device_release,
+	.unlocked_ioctl = tf_device_ioctl,
+	.llseek = no_llseek,
+};
+
+
+static struct sysdev_class g_tf_device_sys_class = {
+	.name = TF_DEVICE_BASE_NAME,
+	.shutdown = tf_device_shutdown,
+	.suspend = tf_device_suspend,
+	.resume = tf_device_resume,
+};
+
+/* The single device supported by this driver */
+static struct tf_device g_tf_dev;
+
+/*----------------------------------------------------------------------------
+ * Implementations
+ *----------------------------------------------------------------------------*/
+
+struct tf_device *tf_get_device(void)
+{
+	return &g_tf_dev;
+}
+
+/*
+ * sysfs entries
+ */
+struct tf_sysfs_entry {
+	struct attribute attr;
+	ssize_t (*show)(struct tf_device *, char *);
+	ssize_t (*store)(struct tf_device *, const char *, size_t);
+};
+
+/*
+ * sysfs entry showing allocation stats
+ */
+static ssize_t info_show(struct tf_device *dev, char *buf)
+{
+	struct tf_device_stats *dev_stats = &dev->stats;
+
+	return snprintf(buf, PAGE_SIZE,
+		"stat.memories.allocated: %d\n"
+		"stat.pages.allocated:    %d\n"
+		"stat.pages.locked:       %d\n",
+		atomic_read(&dev_stats->stat_memories_allocated),
+		atomic_read(&dev_stats->stat_pages_allocated),
+		atomic_read(&dev_stats->stat_pages_locked));
+}
+static struct tf_sysfs_entry tf_info_entry = __ATTR_RO(info);
+
+#ifdef CONFIG_TF_ZEBRA
+/*
+ * sysfs entry showing whether secure world is up and running
+ */
+static ssize_t tf_started_show(struct tf_device *dev, char *buf)
+{
+	int tf_started = test_bit(TF_COMM_FLAG_PA_AVAILABLE,
+		&dev->sm.flags);
+
+	return snprintf(buf, PAGE_SIZE, "%s\n", tf_started ? "yes" : "no");
+}
+static struct tf_sysfs_entry tf_started_entry =
+	__ATTR_RO(tf_started);
+
+static ssize_t workspace_addr_show(struct tf_device *dev, char *buf)
+{
+	return snprintf(buf, PAGE_SIZE, "0x%08x\n", dev->workspace_addr);
+}
+static struct tf_sysfs_entry tf_workspace_addr_entry =
+	__ATTR_RO(workspace_addr);
+
+static ssize_t workspace_size_show(struct tf_device *dev, char *buf)
+{
+	return snprintf(buf, PAGE_SIZE, "0x%08x\n", dev->workspace_size);
+}
+static struct tf_sysfs_entry tf_workspace_size_entry =
+	__ATTR_RO(workspace_size);
+#endif
+
+static ssize_t tf_attr_show(struct kobject *kobj, struct attribute *attr,
+	char *page)
+{
+	struct tf_sysfs_entry *entry = container_of(attr, struct tf_sysfs_entry,
+		attr);
+	struct tf_device *dev = container_of(kobj, struct tf_device, kobj);
+
+	if (!entry->show)
+		return -EIO;
+
+	return entry->show(dev, page);
+}
+
+static ssize_t tf_attr_store(struct kobject *kobj, struct attribute *attr,
+	const char *page, size_t length)
+{
+	struct tf_sysfs_entry *entry = container_of(attr, struct tf_sysfs_entry,
+		attr);
+	struct tf_device *dev = container_of(kobj, struct tf_device, kobj);
+
+	if (!entry->store)
+		return -EIO;
+
+	return entry->store(dev, page, length);
+}
+
+static void tf_kobj_release(struct kobject *kobj) {}
+
+static struct attribute *tf_default_attrs[] = {
+	&tf_info_entry.attr,
+#ifdef CONFIG_TF_ZEBRA
+	&tf_started_entry.attr,
+	&tf_workspace_addr_entry.attr,
+	&tf_workspace_size_entry.attr,
+#endif
+	NULL,
+};
+static const struct sysfs_ops tf_sysfs_ops = {
+	.show	= tf_attr_show,
+	.store	= tf_attr_store,
+};
+static struct kobj_type tf_ktype = {
+	.release	= tf_kobj_release,
+	.sysfs_ops	= &tf_sysfs_ops,
+	.default_attrs	= tf_default_attrs
+};
+
+/*----------------------------------------------------------------------------*/
+
+#if defined(MODULE) && defined(CONFIG_TF_ZEBRA)
+static char *smc_mem;
+module_param(smc_mem, charp, S_IRUGO);
+#endif
+
+/*
+ * First routine called when the kernel module is loaded
+ */
+static int __init tf_device_register(void)
+{
+	int error;
+	struct tf_device *dev = &g_tf_dev;
+
+	dprintk(KERN_INFO "tf_device_register()\n");
+
+	/*
+	 * Initialize the device
+	 */
+	dev->dev_number = MKDEV(device_major_number,
+		TF_DEVICE_MINOR_NUMBER);
+	cdev_init(&dev->cdev, &g_tf_device_file_ops);
+	dev->cdev.owner = THIS_MODULE;
+
+	g_tf_sysdev.id = 0;
+	g_tf_sysdev.cls = &g_tf_device_sys_class;
+
+	INIT_LIST_HEAD(&dev->connection_list);
+	spin_lock_init(&dev->connection_list_lock);
+
+#if defined(MODULE) && defined(CONFIG_TF_ZEBRA)
+	error = (*tf_comm_early_init)();
+	if (error)
+		goto module_early_init_failed;
+
+	error = tf_device_mshield_init(smc_mem);
+	if (error)
+		goto mshield_init_failed;
+
+#ifdef CONFIG_TF_DRIVER_CRYPTO_FIPS
+	error = tf_crypto_hmac_module_init();
+	if (error)
+		goto hmac_init_failed;
+
+	error = tf_self_test_register_device();
+	if (error)
+		goto self_test_register_device_failed;
+#endif
+#endif
+
+	/* register the sysfs object driver stats */
+	error = kobject_init_and_add(&dev->kobj,  &tf_ktype, NULL, "%s",
+		 TF_DEVICE_BASE_NAME);
+	if (error) {
+		printk(KERN_ERR "tf_device_register(): "
+			"kobject_init_and_add failed (error %d)!\n", error);
+		kobject_put(&dev->kobj);
+		goto kobject_init_and_add_failed;
+	}
+
+	/*
+	 * Register the system device.
+	 */
+
+	error = sysdev_class_register(&g_tf_device_sys_class);
+	if (error != 0) {
+		printk(KERN_ERR "tf_device_register():"
+			" sysdev_class_register failed (error %d)!\n",
+			error);
+		goto sysdev_class_register_failed;
+	}
+
+	error = sysdev_register(&g_tf_sysdev);
+	if (error != 0) {
+		dprintk(KERN_ERR "tf_device_register(): "
+			"sysdev_register failed (error %d)!\n",
+			error);
+		goto sysdev_register_failed;
+	}
+
+	/*
+	 * Register the char device.
+	 */
+	printk(KERN_INFO "Registering char device %s (%u:%u)\n",
+		TF_DEVICE_BASE_NAME,
+		MAJOR(dev->dev_number),
+		MINOR(dev->dev_number));
+	error = register_chrdev_region(dev->dev_number, 1,
+		TF_DEVICE_BASE_NAME);
+	if (error != 0) {
+		printk(KERN_ERR "tf_device_register():"
+			" register_chrdev_region failed (error %d)!\n",
+			error);
+		goto register_chrdev_region_failed;
+	}
+
+	error = cdev_add(&dev->cdev, dev->dev_number, 1);
+	if (error != 0) {
+		printk(KERN_ERR "tf_device_register(): "
+			"cdev_add failed (error %d)!\n",
+			error);
+		goto cdev_add_failed;
+	}
+
+	/*
+	 * Initialize the communication with the Secure World.
+	 */
+#ifdef CONFIG_TF_TRUSTZONE
+	dev->sm.soft_int_irq = soft_interrupt;
+#endif
+	error = tf_init(&g_tf_dev.sm);
+	if (error != S_SUCCESS) {
+		dprintk(KERN_ERR "tf_device_register(): "
+			"tf_init failed (error %d)!\n",
+			error);
+		goto init_failed;
+	}
+
+#ifdef CONFIG_TF_DRIVER_CRYPTO_FIPS
+	error = tf_self_test_post_init(&(dev_stats->kobj));
+	/* N.B. error > 0 indicates a POST failure, which will not
+	   prevent the module from loading. */
+	if (error < 0) {
+		dprintk(KERN_ERR "tf_device_register(): "
+			"tf_self_test_post_vectors failed (error %d)!\n",
+			error);
+		goto post_failed;
+	}
+#endif
+
+#ifdef CONFIG_ANDROID
+	tf_class = class_create(THIS_MODULE, TF_DEVICE_BASE_NAME);
+	device_create(tf_class, NULL,
+		dev->dev_number,
+		NULL, TF_DEVICE_BASE_NAME);
+#endif
+
+#ifdef CONFIG_TF_ZEBRA
+	/*
+	 * Initializes the /dev/tf_ctrl device node.
+	 */
+	error = tf_ctrl_device_register();
+	if (error)
+		goto ctrl_failed;
+#endif
+
+#ifdef CONFIG_TF_DRIVER_DEBUG_SUPPORT
+	address_cache_property((unsigned long) &tf_device_register);
+#endif
+	/*
+	 * Successful completion.
+	 */
+
+	dprintk(KERN_INFO "tf_device_register(): Success\n");
+	return 0;
+
+	/*
+	 * Error: undo all operations in the reverse order
+	 */
+#ifdef CONFIG_TF_ZEBRA
+ctrl_failed:
+#endif
+#ifdef CONFIG_TF_DRIVER_CRYPTO_FIPS
+	tf_self_test_post_exit();
+post_failed:
+#endif
+init_failed:
+	cdev_del(&dev->cdev);
+cdev_add_failed:
+	unregister_chrdev_region(dev->dev_number, 1);
+register_chrdev_region_failed:
+	sysdev_unregister(&g_tf_sysdev);
+sysdev_register_failed:
+	sysdev_class_unregister(&g_tf_device_sys_class);
+sysdev_class_register_failed:
+kobject_init_and_add_failed:
+	kobject_del(&g_tf_dev.kobj);
+
+#if defined(MODULE) && defined(CONFIG_TF_ZEBRA)
+#ifdef CONFIG_TF_DRIVER_CRYPTO_FIPS
+	tf_self_test_unregister_device();
+self_test_register_device_failed:
+	tf_crypto_hmac_module_exit();
+hmac_init_failed:
+#endif
+	tf_device_mshield_exit();
+mshield_init_failed:
+module_early_init_failed:
+#endif
+	dprintk(KERN_INFO "tf_device_register(): Failure (error %d)\n",
+		error);
+	return error;
+}
+
+/*----------------------------------------------------------------------------*/
+
+static int tf_device_open(struct inode *inode, struct file *file)
+{
+	int error;
+	struct tf_device *dev = &g_tf_dev;
+	struct tf_connection *connection = NULL;
+
+	dprintk(KERN_INFO "tf_device_open(%u:%u, %p)\n",
+		imajor(inode), iminor(inode), file);
+
+	/* Dummy lseek for non-seekable driver */
+	error = nonseekable_open(inode, file);
+	if (error != 0) {
+		dprintk(KERN_ERR "tf_device_open(%p): "
+			"nonseekable_open failed (error %d)!\n",
+			file, error);
+		goto error;
+	}
+
+#ifndef CONFIG_ANDROID
+	/*
+	 * Check file flags. We only autthorize the O_RDWR access
+	 */
+	if (file->f_flags != O_RDWR) {
+		dprintk(KERN_ERR "tf_device_open(%p): "
+			"Invalid access mode %u\n",
+			file, file->f_flags);
+		error = -EACCES;
+		goto error;
+	}
+#endif
+
+	/*
+	 * Open a new connection.
+	 */
+
+	error = tf_open(dev, file, &connection);
+	if (error != 0) {
+		dprintk(KERN_ERR "tf_device_open(%p): "
+			"tf_open failed (error %d)!\n",
+			file, error);
+		goto error;
+	}
+
+	file->private_data = connection;
+
+	/*
+	 * Send the CreateDeviceContext command to the secure
+	 */
+	error = tf_create_device_context(connection);
+	if (error != 0) {
+		dprintk(KERN_ERR "tf_device_open(%p): "
+			"tf_create_device_context failed (error %d)!\n",
+			file, error);
+		goto error1;
+	}
+
+	/*
+	 * Successful completion.
+	 */
+
+	dprintk(KERN_INFO "tf_device_open(%p): Success (connection=%p)\n",
+		file, connection);
+	return 0;
+
+	/*
+	 * Error handling.
+	 */
+
+error1:
+	tf_close(connection);
+error:
+	dprintk(KERN_INFO "tf_device_open(%p): Failure (error %d)\n",
+		file, error);
+	return error;
+}
+
+/*----------------------------------------------------------------------------*/
+
+static int tf_device_release(struct inode *inode, struct file *file)
+{
+	struct tf_connection *connection;
+
+	dprintk(KERN_INFO "tf_device_release(%u:%u, %p)\n",
+		imajor(inode), iminor(inode), file);
+
+	connection = tf_conn_from_file(file);
+	tf_close(connection);
+
+	dprintk(KERN_INFO "tf_device_release(%p): Success\n", file);
+	return 0;
+}
+
+/*----------------------------------------------------------------------------*/
+
+static long tf_device_ioctl(struct file *file, unsigned int ioctl_num,
+	unsigned long ioctl_param)
+{
+	int result = S_SUCCESS;
+	struct tf_connection *connection;
+	union tf_command command;
+	struct tf_command_header header;
+	union tf_answer answer;
+	u32 command_size;
+	u32 answer_size;
+	void *user_answer;
+
+	dprintk(KERN_INFO "tf_device_ioctl(%p, %u, %p)\n",
+		file, ioctl_num, (void *) ioctl_param);
+
+	switch (ioctl_num) {
+	case IOCTL_TF_GET_VERSION:
+		/* ioctl is asking for the driver interface version */
+		result = TF_DRIVER_INTERFACE_VERSION;
+		goto exit;
+
+	case IOCTL_TF_EXCHANGE:
+		/*
+		 * ioctl is asking to perform a message exchange with the Secure
+		 * Module
+		 */
+
+		/*
+		 * Make a local copy of the data from the user application
+		 * This routine checks the data is readable
+		 *
+		 * Get the header first.
+		 */
+		if (copy_from_user(&header,
+				(struct tf_command_header *)ioctl_param,
+				sizeof(struct tf_command_header))) {
+			dprintk(KERN_ERR "tf_device_ioctl(%p): "
+				"Cannot access ioctl parameter %p\n",
+				file, (void *) ioctl_param);
+			result = -EFAULT;
+			goto exit;
+		}
+
+		/* size in words of u32 */
+		command_size = header.message_size +
+			sizeof(struct tf_command_header)/sizeof(u32);
+		if (command_size > sizeof(command)/sizeof(u32)) {
+			dprintk(KERN_ERR "tf_device_ioctl(%p): "
+				"Buffer overflow: too many bytes to copy %d\n",
+				file, command_size);
+			result = -EFAULT;
+			goto exit;
+		}
+
+		if (copy_from_user(&command,
+				(union tf_command *)ioctl_param,
+				command_size * sizeof(u32))) {
+			dprintk(KERN_ERR "tf_device_ioctl(%p): "
+				"Cannot access ioctl parameter %p\n",
+				file, (void *) ioctl_param);
+			result = -EFAULT;
+			goto exit;
+		}
+
+		connection = tf_conn_from_file(file);
+		BUG_ON(connection == NULL);
+
+		/*
+		 * The answer memory space address is in the operation_id field
+		 */
+		user_answer = (void *) command.header.operation_id;
+
+		atomic_inc(&(connection->pending_op_count));
+
+		dprintk(KERN_WARNING "tf_device_ioctl(%p): "
+			"Sending message type  0x%08x\n",
+			file, command.header.message_type);
+
+		switch (command.header.message_type) {
+		case TF_MESSAGE_TYPE_OPEN_CLIENT_SESSION:
+			result = tf_open_client_session(connection,
+				&command, &answer);
+			break;
+
+		case TF_MESSAGE_TYPE_CLOSE_CLIENT_SESSION:
+			result = tf_close_client_session(connection,
+				&command, &answer);
+			break;
+
+		case TF_MESSAGE_TYPE_REGISTER_SHARED_MEMORY:
+			result = tf_register_shared_memory(connection,
+				&command, &answer);
+			break;
+
+		case TF_MESSAGE_TYPE_RELEASE_SHARED_MEMORY:
+			result = tf_release_shared_memory(connection,
+				&command, &answer);
+			break;
+
+		case TF_MESSAGE_TYPE_INVOKE_CLIENT_COMMAND:
+			result = tf_invoke_client_command(connection,
+				&command, &answer);
+			break;
+
+		case TF_MESSAGE_TYPE_CANCEL_CLIENT_COMMAND:
+			result = tf_cancel_client_command(connection,
+				&command, &answer);
+			break;
+
+		default:
+			dprintk(KERN_ERR "tf_device_ioctl(%p): "
+				"Incorrect message type (0x%08x)!\n",
+				connection, command.header.message_type);
+			result = -EOPNOTSUPP;
+			break;
+		}
+
+		atomic_dec(&(connection->pending_op_count));
+
+		if (result != 0) {
+			dprintk(KERN_WARNING "tf_device_ioctl(%p): "
+				"Operation returning error code 0x%08x)!\n",
+				file, result);
+			goto exit;
+		}
+
+		/*
+		 * Copy the answer back to the user space application.
+		 * The driver does not check this field, only copy back to user
+		 * space the data handed over by Secure World
+		 */
+		answer_size = answer.header.message_size +
+			sizeof(struct tf_answer_header)/sizeof(u32);
+		if (copy_to_user(user_answer,
+				&answer, answer_size * sizeof(u32))) {
+			dprintk(KERN_WARNING "tf_device_ioctl(%p): "
+				"Failed to copy back the full command "
+				"answer to %p\n", file, user_answer);
+			result = -EFAULT;
+			goto exit;
+		}
+
+		/* successful completion */
+		dprintk(KERN_INFO "tf_device_ioctl(%p): Success\n", file);
+		break;
+
+	case  IOCTL_TF_GET_DESCRIPTION: {
+		/* ioctl asking for the version information buffer */
+		struct tf_version_information_buffer *pInfoBuffer;
+
+		dprintk(KERN_INFO "IOCTL_TF_GET_DESCRIPTION:(%p, %u, %p)\n",
+			file, ioctl_num, (void *) ioctl_param);
+
+		pInfoBuffer =
+			((struct tf_version_information_buffer *) ioctl_param);
+
+		dprintk(KERN_INFO "IOCTL_TF_GET_DESCRIPTION1: "
+			"driver_description=\"%64s\"\n", S_VERSION_STRING);
+
+		if (copy_to_user(pInfoBuffer->driver_description,
+				S_VERSION_STRING,
+				strlen(S_VERSION_STRING) + 1)) {
+			dprintk(KERN_ERR "tf_device_ioctl(%p): "
+				"Fail to copy back the driver description "
+				"to  %p\n",
+				file, pInfoBuffer->driver_description);
+			result = -EFAULT;
+			goto exit;
+		}
+
+		dprintk(KERN_INFO "IOCTL_TF_GET_DESCRIPTION2: "
+			"secure_world_description=\"%64s\"\n",
+			tf_get_description(&g_tf_dev.sm));
+
+		if (copy_to_user(pInfoBuffer->secure_world_description,
+				tf_get_description(&g_tf_dev.sm),
+				TF_DESCRIPTION_BUFFER_LENGTH)) {
+			dprintk(KERN_WARNING "tf_device_ioctl(%p): "
+				"Failed to copy back the secure world "
+				"description to %p\n",
+				file, pInfoBuffer->secure_world_description);
+			result = -EFAULT;
+			goto exit;
+		}
+		break;
+	}
+
+	default:
+		dprintk(KERN_ERR "tf_device_ioctl(%p): "
+			"Unknown IOCTL code 0x%08x!\n",
+			file, ioctl_num);
+		result = -EOPNOTSUPP;
+		goto exit;
+	}
+
+exit:
+	return result;
+}
+
+/*----------------------------------------------------------------------------*/
+
+static int tf_device_shutdown(struct sys_device *sysdev)
+{
+
+	return tf_power_management(&g_tf_dev.sm,
+		TF_POWER_OPERATION_SHUTDOWN);
+}
+
+/*----------------------------------------------------------------------------*/
+
+static int tf_device_suspend(struct sys_device *sysdev, pm_message_t state)
+{
+	dprintk(KERN_INFO "tf_device_suspend: Enter\n");
+	return tf_power_management(&g_tf_dev.sm,
+		TF_POWER_OPERATION_HIBERNATE);
+}
+
+
+/*----------------------------------------------------------------------------*/
+
+static int tf_device_resume(struct sys_device *sysdev)
+{
+	return tf_power_management(&g_tf_dev.sm,
+		TF_POWER_OPERATION_RESUME);
+}
+
+
+/*----------------------------------------------------------------------------*/
+
+module_init(tf_device_register);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Trusted Logic S.A.");
diff --git a/security/tf_driver/tf_protocol.h b/security/tf_driver/tf_protocol.h
new file mode 100644
index 000000000000..403df8ec8ef5
--- /dev/null
+++ b/security/tf_driver/tf_protocol.h
@@ -0,0 +1,690 @@
+/**
+ * Copyright (c) 2011 Trusted Logic S.A.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef __TF_PROTOCOL_H__
+#define __TF_PROTOCOL_H__
+
+/*----------------------------------------------------------------------------
+ *
+ * This header file defines the structure used in the SChannel Protocol.
+ * See your Product Reference Manual for a specification of the SChannel
+ * protocol.
+ *---------------------------------------------------------------------------*/
+
+/*
+ * The driver interface version returned by the version ioctl
+ */
+#define TF_DRIVER_INTERFACE_VERSION     0x04000000
+
+/*
+ * Protocol version handling
+ */
+#define TF_S_PROTOCOL_MAJOR_VERSION  (0x06)
+#define GET_PROTOCOL_MAJOR_VERSION(a) (a >> 24)
+#define GET_PROTOCOL_MINOR_VERSION(a) ((a >> 16) & 0xFF)
+
+/*
+ * The S flag of the config_flag_s register.
+ */
+#define TF_CONFIG_FLAG_S   (1 << 3)
+
+/*
+ * The TimeSlot field of the sync_serial_n register.
+ */
+#define TF_SYNC_SERIAL_TIMESLOT_N   (1)
+
+/*
+ * status_s related defines.
+ */
+#define TF_STATUS_P_MASK            (0X00000001)
+#define TF_STATUS_POWER_STATE_SHIFT (3)
+#define TF_STATUS_POWER_STATE_MASK  (0x1F << TF_STATUS_POWER_STATE_SHIFT)
+
+/*
+ * Possible power states of the POWER_STATE field of the status_s register
+ */
+#define TF_POWER_MODE_COLD_BOOT          (0)
+#define TF_POWER_MODE_WARM_BOOT          (1)
+#define TF_POWER_MODE_ACTIVE             (3)
+#define TF_POWER_MODE_READY_TO_SHUTDOWN  (5)
+#define TF_POWER_MODE_READY_TO_HIBERNATE (7)
+#define TF_POWER_MODE_WAKEUP             (8)
+#define TF_POWER_MODE_PANIC              (15)
+
+/*
+ * Possible command values for MANAGEMENT commands
+ */
+#define TF_MANAGEMENT_HIBERNATE            (1)
+#define TF_MANAGEMENT_SHUTDOWN             (2)
+#define TF_MANAGEMENT_PREPARE_FOR_CORE_OFF (3)
+#define TF_MANAGEMENT_RESUME_FROM_CORE_OFF (4)
+
+/*
+ * The capacity of the Normal Word message queue, in number of slots.
+ */
+#define TF_N_MESSAGE_QUEUE_CAPACITY  (512)
+
+/*
+ * The capacity of the Secure World message answer queue, in number of slots.
+ */
+#define TF_S_ANSWER_QUEUE_CAPACITY  (256)
+
+/*
+ * The value of the S-timeout register indicating an infinite timeout.
+ */
+#define TF_S_TIMEOUT_0_INFINITE  (0xFFFFFFFF)
+#define TF_S_TIMEOUT_1_INFINITE  (0xFFFFFFFF)
+
+/*
+ * The value of the S-timeout register indicating an immediate timeout.
+ */
+#define TF_S_TIMEOUT_0_IMMEDIATE  (0x0)
+#define TF_S_TIMEOUT_1_IMMEDIATE  (0x0)
+
+/*
+ * Identifies the get protocol version SMC.
+ */
+#define TF_SMC_GET_PROTOCOL_VERSION (0XFFFFFFFB)
+
+/*
+ * Identifies the init SMC.
+ */
+#define TF_SMC_INIT                 (0XFFFFFFFF)
+
+/*
+ * Identifies the reset irq SMC.
+ */
+#define TF_SMC_RESET_IRQ            (0xFFFFFFFE)
+
+/*
+ * Identifies the SET_W3B SMC.
+ */
+#define TF_SMC_WAKE_UP              (0xFFFFFFFD)
+
+/*
+ * Identifies the STOP SMC.
+ */
+#define TF_SMC_STOP                 (0xFFFFFFFC)
+
+/*
+ * Identifies the n-yield SMC.
+ */
+#define TF_SMC_N_YIELD              (0X00000003)
+
+
+/* Possible stop commands for SMC_STOP */
+#define SCSTOP_HIBERNATE           (0xFFFFFFE1)
+#define SCSTOP_SHUTDOWN            (0xFFFFFFE2)
+
+/*
+ * representation of an UUID.
+ */
+struct tf_uuid {
+	u32 time_low;
+	u16 time_mid;
+	u16 time_hi_and_version;
+	u8 clock_seq_and_node[8];
+};
+
+
+/**
+ * Command parameters.
+ */
+struct tf_command_param_value {
+	u32    a;
+	u32    b;
+};
+
+struct tf_command_param_temp_memref {
+	u32    descriptor; /* data pointer for exchange message.*/
+	u32    size;
+	u32    offset;
+};
+
+struct tf_command_param_memref {
+	u32      block;
+	u32      size;
+	u32      offset;
+};
+
+union tf_command_param {
+	struct tf_command_param_value        value;
+	struct tf_command_param_temp_memref  temp_memref;
+	struct tf_command_param_memref       memref;
+};
+
+/**
+ * Answer parameters.
+ */
+struct tf_answer_param_value {
+	u32   a;
+	u32   b;
+};
+
+struct tf_answer_param_size {
+	u32   _ignored;
+	u32   size;
+};
+
+union tf_answer_param {
+	struct tf_answer_param_size    size;
+	struct tf_answer_param_value   value;
+};
+
+/*
+ * Descriptor tables capacity
+ */
+#define TF_MAX_W3B_COARSE_PAGES                 (2)
+/* TF_MAX_COARSE_PAGES is the number of level 1 descriptors (describing
+ * 1MB each) that can be shared with the secure world in a single registered
+ * shared memory block. It must be kept in synch with
+ * SCHANNEL6_MAX_DESCRIPTORS_PER_REGISTERED_SHARED_MEM in the SChannel
+ * protocol spec. */
+#define TF_MAX_COARSE_PAGES                     128
+#define TF_DESCRIPTOR_TABLE_CAPACITY_BIT_SHIFT  (8)
+#define TF_DESCRIPTOR_TABLE_CAPACITY \
+	(1 << TF_DESCRIPTOR_TABLE_CAPACITY_BIT_SHIFT)
+#define TF_DESCRIPTOR_TABLE_CAPACITY_MASK \
+	(TF_DESCRIPTOR_TABLE_CAPACITY - 1)
+/* Shared memories coarse pages can map up to 1MB */
+#define TF_MAX_COARSE_PAGE_MAPPED_SIZE \
+	(PAGE_SIZE * TF_DESCRIPTOR_TABLE_CAPACITY)
+/* Shared memories cannot exceed 8MB */
+#define TF_MAX_SHMEM_SIZE \
+	(TF_MAX_COARSE_PAGE_MAPPED_SIZE << 3)
+
+/*
+ * Buffer size for version description fields
+ */
+#define TF_DESCRIPTION_BUFFER_LENGTH 64
+
+/*
+ * Shared memory type flags.
+ */
+#define TF_SHMEM_TYPE_READ         (0x00000001)
+#define TF_SHMEM_TYPE_WRITE        (0x00000002)
+
+/*
+ * Shared mem flags
+ */
+#define TF_SHARED_MEM_FLAG_INPUT   1
+#define TF_SHARED_MEM_FLAG_OUTPUT  2
+#define TF_SHARED_MEM_FLAG_INOUT   3
+
+
+/*
+ * Parameter types
+ */
+#define TF_PARAM_TYPE_NONE               0x0
+#define TF_PARAM_TYPE_VALUE_INPUT        0x1
+#define TF_PARAM_TYPE_VALUE_OUTPUT       0x2
+#define TF_PARAM_TYPE_VALUE_INOUT        0x3
+#define TF_PARAM_TYPE_MEMREF_TEMP_INPUT  0x5
+#define TF_PARAM_TYPE_MEMREF_TEMP_OUTPUT 0x6
+#define TF_PARAM_TYPE_MEMREF_TEMP_INOUT  0x7
+#define TF_PARAM_TYPE_MEMREF_INPUT       0xD
+#define TF_PARAM_TYPE_MEMREF_OUTPUT      0xE
+#define TF_PARAM_TYPE_MEMREF_INOUT       0xF
+
+#define TF_PARAM_TYPE_MEMREF_FLAG               0x4
+#define TF_PARAM_TYPE_REGISTERED_MEMREF_FLAG    0x8
+
+
+#define TF_MAKE_PARAM_TYPES(t0, t1, t2, t3) \
+	((t0) | ((t1) << 4) | ((t2) << 8) | ((t3) << 12))
+#define TF_GET_PARAM_TYPE(t, i) (((t) >> (4 * i)) & 0xF)
+
+/*
+ * Login types.
+ */
+#define TF_LOGIN_PUBLIC              0x00000000
+#define TF_LOGIN_USER                0x00000001
+#define TF_LOGIN_GROUP               0x00000002
+#define TF_LOGIN_APPLICATION         0x00000004
+#define TF_LOGIN_APPLICATION_USER    0x00000005
+#define TF_LOGIN_APPLICATION_GROUP   0x00000006
+#define TF_LOGIN_AUTHENTICATION      0x80000000
+#define TF_LOGIN_PRIVILEGED          0x80000002
+
+/* Login variants */
+
+#define TF_LOGIN_VARIANT(main_type, os, variant) \
+	((main_type) | (1 << 27) | ((os) << 16) | ((variant) << 8))
+
+#define TF_LOGIN_GET_MAIN_TYPE(type) \
+	((type) & ~TF_LOGIN_VARIANT(0, 0xFF, 0xFF))
+
+#define TF_LOGIN_OS_ANY       0x00
+#define TF_LOGIN_OS_LINUX     0x01
+#define TF_LOGIN_OS_ANDROID   0x04
+
+/* OS-independent variants */
+#define TF_LOGIN_USER_NONE \
+	TF_LOGIN_VARIANT(TF_LOGIN_USER, TF_LOGIN_OS_ANY, 0xFF)
+#define TF_LOGIN_GROUP_NONE \
+	TF_LOGIN_VARIANT(TF_LOGIN_GROUP, TF_LOGIN_OS_ANY, 0xFF)
+#define TF_LOGIN_APPLICATION_USER_NONE \
+	TF_LOGIN_VARIANT(TF_LOGIN_APPLICATION_USER, TF_LOGIN_OS_ANY, 0xFF)
+#define TF_LOGIN_AUTHENTICATION_BINARY_SHA1_HASH \
+	TF_LOGIN_VARIANT(TF_LOGIN_AUTHENTICATION, TF_LOGIN_OS_ANY, 0x01)
+#define TF_LOGIN_PRIVILEGED_KERNEL \
+	TF_LOGIN_VARIANT(TF_LOGIN_PRIVILEGED, TF_LOGIN_OS_ANY, 0x01)
+
+/* Linux variants */
+#define TF_LOGIN_USER_LINUX_EUID \
+	TF_LOGIN_VARIANT(TF_LOGIN_USER, TF_LOGIN_OS_LINUX, 0x01)
+#define TF_LOGIN_GROUP_LINUX_GID \
+	TF_LOGIN_VARIANT(TF_LOGIN_GROUP, TF_LOGIN_OS_LINUX, 0x01)
+#define TF_LOGIN_APPLICATION_LINUX_PATH_SHA1_HASH \
+	TF_LOGIN_VARIANT(TF_LOGIN_APPLICATION, TF_LOGIN_OS_LINUX, 0x01)
+#define TF_LOGIN_APPLICATION_USER_LINUX_PATH_EUID_SHA1_HASH \
+	TF_LOGIN_VARIANT(TF_LOGIN_APPLICATION_USER, TF_LOGIN_OS_LINUX, 0x01)
+#define TF_LOGIN_APPLICATION_GROUP_LINUX_PATH_GID_SHA1_HASH \
+	TF_LOGIN_VARIANT(TF_LOGIN_APPLICATION_GROUP, TF_LOGIN_OS_LINUX, 0x01)
+
+/* Android variants */
+#define TF_LOGIN_USER_ANDROID_EUID \
+	TF_LOGIN_VARIANT(TF_LOGIN_USER, TF_LOGIN_OS_ANDROID, 0x01)
+#define TF_LOGIN_GROUP_ANDROID_GID \
+	TF_LOGIN_VARIANT(TF_LOGIN_GROUP, TF_LOGIN_OS_ANDROID, 0x01)
+#define TF_LOGIN_APPLICATION_ANDROID_UID \
+	TF_LOGIN_VARIANT(TF_LOGIN_APPLICATION, TF_LOGIN_OS_ANDROID, 0x01)
+#define TF_LOGIN_APPLICATION_USER_ANDROID_UID_EUID \
+	TF_LOGIN_VARIANT(TF_LOGIN_APPLICATION_USER, TF_LOGIN_OS_ANDROID, \
+		0x01)
+#define TF_LOGIN_APPLICATION_GROUP_ANDROID_UID_GID \
+	TF_LOGIN_VARIANT(TF_LOGIN_APPLICATION_GROUP, TF_LOGIN_OS_ANDROID, \
+		0x01)
+
+/*
+ *  return origins
+ */
+#define TF_ORIGIN_COMMS       2
+#define TF_ORIGIN_TEE         3
+#define TF_ORIGIN_TRUSTED_APP 4
+/*
+ * The message types.
+ */
+#define TF_MESSAGE_TYPE_CREATE_DEVICE_CONTEXT   0x02
+#define TF_MESSAGE_TYPE_DESTROY_DEVICE_CONTEXT  0xFD
+#define TF_MESSAGE_TYPE_REGISTER_SHARED_MEMORY  0xF7
+#define TF_MESSAGE_TYPE_RELEASE_SHARED_MEMORY   0xF9
+#define TF_MESSAGE_TYPE_OPEN_CLIENT_SESSION     0xF0
+#define TF_MESSAGE_TYPE_CLOSE_CLIENT_SESSION    0xF2
+#define TF_MESSAGE_TYPE_INVOKE_CLIENT_COMMAND   0xF5
+#define TF_MESSAGE_TYPE_CANCEL_CLIENT_COMMAND   0xF4
+#define TF_MESSAGE_TYPE_MANAGEMENT              0xFE
+
+
+/*
+ * The SChannel error codes.
+ */
+#define S_SUCCESS 0x00000000
+#define S_ERROR_OUT_OF_MEMORY 0xFFFF000C
+
+
+struct tf_command_header {
+	u8                       message_size;
+	u8                       message_type;
+	u16                      message_info;
+	u32                      operation_id;
+};
+
+struct tf_answer_header {
+	u8                   message_size;
+	u8                   message_type;
+	u16                  message_info;
+	u32                  operation_id;
+	u32                  error_code;
+};
+
+/*
+ * CREATE_DEVICE_CONTEXT command message.
+ */
+struct tf_command_create_device_context {
+	u8                       message_size;
+	u8                       message_type;
+	u16                      message_info_rfu;
+	u32                      operation_id;
+	u32                      device_context_id;
+};
+
+/*
+ * CREATE_DEVICE_CONTEXT answer message.
+ */
+struct tf_answer_create_device_context {
+	u8                       message_size;
+	u8                       message_type;
+	u16                      message_info_rfu;
+	/* an opaque Normal World identifier for the operation */
+	u32                      operation_id;
+	u32                      error_code;
+	/* an opaque Normal World identifier for the device context */
+	u32                      device_context;
+};
+
+/*
+ * DESTROY_DEVICE_CONTEXT command message.
+ */
+struct tf_command_destroy_device_context {
+	u8                       message_size;
+	u8                       message_type;
+	u16                      message_info_rfu;
+	u32                      operation_id;
+	u32                      device_context;
+};
+
+/*
+ * DESTROY_DEVICE_CONTEXT answer message.
+ */
+struct tf_answer_destroy_device_context {
+	u8                       message_size;
+	u8                       message_type;
+	u16                      message_info_rfu;
+	/* an opaque Normal World identifier for the operation */
+	u32                      operation_id;
+	u32                      error_code;
+	u32                      device_context_id;
+};
+
+/*
+ * OPEN_CLIENT_SESSION command message.
+ */
+struct tf_command_open_client_session {
+	u8                            message_size;
+	u8                            message_type;
+	u16                           param_types;
+	/* an opaque Normal World identifier for the operation */
+	u32                           operation_id;
+	u32                           device_context;
+	u32                           cancellation_id;
+	u64                           timeout;
+	struct tf_uuid                destination_uuid;
+	union tf_command_param        params[4];
+	u32                           login_type;
+	/*
+	 * Size = 0 for public, [16] for group identification, [20] for
+	 * authentication
+	 */
+	u8                            login_data[20];
+};
+
+/*
+ * OPEN_CLIENT_SESSION answer message.
+ */
+struct tf_answer_open_client_session {
+	u8                       message_size;
+	u8                       message_type;
+	u8                       error_origin;
+	u8                       __reserved;
+	/* an opaque Normal World identifier for the operation */
+	u32                      operation_id;
+	u32                      error_code;
+	u32                      client_session;
+	union tf_answer_param    answers[4];
+};
+
+/*
+ * CLOSE_CLIENT_SESSION command message.
+ */
+struct tf_command_close_client_session {
+	u8                       message_size;
+	u8                       message_type;
+	u16                      message_info_rfu;
+	/* an opaque Normal World identifier for the operation */
+	u32                      operation_id;
+	u32                      device_context;
+	u32                      client_session;
+};
+
+/*
+ * CLOSE_CLIENT_SESSION answer message.
+ */
+struct tf_answer_close_client_session {
+	u8                       message_size;
+	u8                       message_type;
+	u16                      message_info_rfu;
+	/* an opaque Normal World identifier for the operation */
+	u32                      operation_id;
+	u32                      error_code;
+};
+
+
+/*
+ * REGISTER_SHARED_MEMORY command message
+ */
+struct tf_command_register_shared_memory {
+	u8  message_size;
+	u8  message_type;
+	u16 memory_flags;
+	u32 operation_id;
+	u32 device_context;
+	u32 block_id;
+	u32 shared_mem_size;
+	u32 shared_mem_start_offset;
+	u32 shared_mem_descriptors[TF_MAX_COARSE_PAGES];
+};
+
+/*
+ * REGISTER_SHARED_MEMORY answer message.
+ */
+struct tf_answer_register_shared_memory {
+	u8                       message_size;
+	u8                       message_type;
+	u16                      message_info_rfu;
+	/* an opaque Normal World identifier for the operation */
+	u32                      operation_id;
+	u32                      error_code;
+	u32                      block;
+};
+
+/*
+ * RELEASE_SHARED_MEMORY command message.
+ */
+struct tf_command_release_shared_memory {
+	u8                       message_size;
+	u8                       message_type;
+	u16                      message_info_rfu;
+	/* an opaque Normal World identifier for the operation */
+	u32                      operation_id;
+	u32                      device_context;
+	u32                      block;
+};
+
+/*
+ * RELEASE_SHARED_MEMORY answer message.
+ */
+struct tf_answer_release_shared_memory {
+	u8                       message_size;
+	u8                       message_type;
+	u16                      message_info_rfu;
+	u32                      operation_id;
+	u32                      error_code;
+	u32                      block_id;
+};
+
+/*
+ * INVOKE_CLIENT_COMMAND command message.
+ */
+struct tf_command_invoke_client_command {
+	u8                       message_size;
+	u8                       message_type;
+	u16                      param_types;
+	u32                      operation_id;
+	u32                      device_context;
+	u32                      client_session;
+	u64                      timeout;
+	u32                      cancellation_id;
+	u32                      client_command_identifier;
+	union tf_command_param   params[4];
+};
+
+/*
+ * INVOKE_CLIENT_COMMAND command answer.
+ */
+struct tf_answer_invoke_client_command {
+	u8                     message_size;
+	u8                     message_type;
+	u8                     error_origin;
+	u8                     __reserved;
+	u32                    operation_id;
+	u32                    error_code;
+	union tf_answer_param  answers[4];
+};
+
+/*
+ * CANCEL_CLIENT_OPERATION command message.
+ */
+struct tf_command_cancel_client_operation {
+	u8                   message_size;
+	u8                   message_type;
+	u16                  message_info_rfu;
+	/* an opaque Normal World identifier for the operation */
+	u32                  operation_id;
+	u32                  device_context;
+	u32                  client_session;
+	u32                  cancellation_id;
+};
+
+struct tf_answer_cancel_client_operation {
+	u8                   message_size;
+	u8                   message_type;
+	u16                  message_info_rfu;
+	u32                  operation_id;
+	u32                  error_code;
+};
+
+/*
+ * MANAGEMENT command message.
+ */
+struct tf_command_management {
+	u8                   message_size;
+	u8                   message_type;
+	u16                  command;
+	u32                  operation_id;
+	u32                  w3b_size;
+	u32                  w3b_start_offset;
+	u32                  shared_mem_descriptors[1];
+};
+
+/*
+ * POWER_MANAGEMENT answer message.
+ * The message does not provide message specific parameters.
+ * Therefore no need to define a specific answer structure
+ */
+
+/*
+ * Structure for L2 messages
+ */
+union tf_command {
+	struct tf_command_header                  header;
+	struct tf_command_create_device_context   create_device_context;
+	struct tf_command_destroy_device_context  destroy_device_context;
+	struct tf_command_open_client_session     open_client_session;
+	struct tf_command_close_client_session    close_client_session;
+	struct tf_command_register_shared_memory  register_shared_memory;
+	struct tf_command_release_shared_memory   release_shared_memory;
+	struct tf_command_invoke_client_command   invoke_client_command;
+	struct tf_command_cancel_client_operation cancel_client_operation;
+	struct tf_command_management              management;
+};
+
+/*
+ * Structure for any L2 answer
+ */
+
+union tf_answer {
+	struct tf_answer_header                  header;
+	struct tf_answer_create_device_context   create_device_context;
+	struct tf_answer_open_client_session     open_client_session;
+	struct tf_answer_close_client_session    close_client_session;
+	struct tf_answer_register_shared_memory  register_shared_memory;
+	struct tf_answer_release_shared_memory   release_shared_memory;
+	struct tf_answer_invoke_client_command   invoke_client_command;
+	struct tf_answer_destroy_device_context  destroy_device_context;
+	struct tf_answer_cancel_client_operation cancel_client_operation;
+};
+
+/* Structure of the Communication Buffer */
+struct tf_l1_shared_buffer {
+	#ifdef CONFIG_TF_ZEBRA
+	u32 exit_code;
+	u32 l1_shared_buffer_descr;
+	u32 backing_store_addr;
+	u32 backext_storage_addr;
+	u32 workspace_addr;
+	u32 workspace_size;
+	u32 conf_descriptor;
+	u32 conf_size;
+	u32 conf_offset;
+	u32 protocol_version;
+	u32 rpc_command;
+	u32 rpc_status;
+	u8  reserved1[16];
+	#else
+	u32 config_flag_s;
+	u32 w3b_size_max_s;
+	u32 reserved0;
+	u32 w3b_size_current_s;
+	u8  reserved1[48];
+	#endif
+	u8  version_description[TF_DESCRIPTION_BUFFER_LENGTH];
+	u32 status_s;
+	u32 reserved2;
+	u32 sync_serial_n;
+	u32 sync_serial_s;
+	u64 time_n[2];
+	u64 timeout_s[2];
+	u32 first_command;
+	u32 first_free_command;
+	u32 first_answer;
+	u32 first_free_answer;
+	u32 w3b_descriptors[128];
+	#ifdef CONFIG_TF_ZEBRA
+	u8  rpc_trace_buffer[140];
+	u8  rpc_cus_buffer[180];
+	#else
+	u8  reserved3[320];
+	#endif
+	u32 command_queue[TF_N_MESSAGE_QUEUE_CAPACITY];
+	u32 answer_queue[TF_S_ANSWER_QUEUE_CAPACITY];
+};
+
+
+/*
+ * tf_version_information_buffer structure description
+ * Description of the sVersionBuffer handed over from user space to kernel space
+ * This field is filled by the driver during a CREATE_DEVICE_CONTEXT ioctl
+ * and handed back to user space
+ */
+struct tf_version_information_buffer {
+	u8 driver_description[65];
+	u8 secure_world_description[65];
+};
+
+
+/* The IOCTLs the driver supports */
+#include <linux/ioctl.h>
+
+#define IOCTL_TF_GET_VERSION     _IO('z', 0)
+#define IOCTL_TF_EXCHANGE        _IOWR('z', 1, union tf_command)
+#define IOCTL_TF_GET_DESCRIPTION _IOR('z', 2, \
+	struct tf_version_information_buffer)
+
+#endif  /* !defined(__TF_PROTOCOL_H__) */
diff --git a/security/tf_driver/tf_util.c b/security/tf_driver/tf_util.c
new file mode 100644
index 000000000000..78f90bf677e0
--- /dev/null
+++ b/security/tf_driver/tf_util.c
@@ -0,0 +1,1143 @@
+/**
+ * Copyright (c) 2011 Trusted Logic S.A.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <linux/mman.h>
+#include "tf_util.h"
+
+/*----------------------------------------------------------------------------
+ * Debug printing routines
+ *----------------------------------------------------------------------------*/
+#ifdef CONFIG_TF_DRIVER_DEBUG_SUPPORT
+
+void tf_trace_array(const char *fun, const char *msg,
+		    const void *ptr, size_t len)
+{
+	char hex[511];
+	bool ell = (len > sizeof(hex)/2);
+	unsigned lim = (len > sizeof(hex)/2 ? sizeof(hex)/2 : len);
+	unsigned i;
+	for (i = 0; i < lim; i++)
+		sprintf(hex + 2 * i, "%02x", ((unsigned char *)ptr)[i]);
+	pr_info("%s: %s[%u] = %s%s\n",
+		fun, msg, len, hex, ell ? "..." : "");
+}
+
+void address_cache_property(unsigned long va)
+{
+	unsigned long pa;
+	unsigned long inner;
+	unsigned long outer;
+
+	asm volatile ("mcr p15, 0, %0, c7, c8, 0" : : "r" (va));
+	asm volatile ("mrc p15, 0, %0, c7, c4, 0" : "=r" (pa));
+
+	dprintk(KERN_INFO "VA:%x, PA:%x\n",
+		(unsigned int) va,
+		(unsigned int) pa);
+
+	if (pa & 1) {
+		dprintk(KERN_INFO "Prop Error\n");
+		return;
+	}
+
+	outer = (pa >> 2) & 3;
+	dprintk(KERN_INFO "\touter : %x", (unsigned int) outer);
+
+	switch (outer) {
+	case 3:
+		dprintk(KERN_INFO "Write-Back, no Write-Allocate\n");
+		break;
+	case 2:
+		dprintk(KERN_INFO "Write-Through, no Write-Allocate.\n");
+		break;
+	case 1:
+		dprintk(KERN_INFO "Write-Back, Write-Allocate.\n");
+		break;
+	case 0:
+		dprintk(KERN_INFO "Non-cacheable.\n");
+		break;
+	}
+
+	inner = (pa >> 4) & 7;
+	dprintk(KERN_INFO "\tinner : %x", (unsigned int)inner);
+
+	switch (inner) {
+	case 7:
+		dprintk(KERN_INFO "Write-Back, no Write-Allocate\n");
+		break;
+	case 6:
+		dprintk(KERN_INFO "Write-Through.\n");
+		break;
+	case 5:
+		dprintk(KERN_INFO "Write-Back, Write-Allocate.\n");
+		break;
+	case 3:
+		dprintk(KERN_INFO "Device.\n");
+		break;
+	case 1:
+		dprintk(KERN_INFO "Strongly-ordered.\n");
+		break;
+	case 0:
+		dprintk(KERN_INFO "Non-cacheable.\n");
+		break;
+	}
+
+	if (pa & 0x00000002)
+		dprintk(KERN_INFO "SuperSection.\n");
+	if (pa & 0x00000080)
+		dprintk(KERN_INFO "Memory is shareable.\n");
+	else
+		dprintk(KERN_INFO "Memory is non-shareable.\n");
+
+	if (pa & 0x00000200)
+		dprintk(KERN_INFO "Non-secure.\n");
+}
+
+/*
+ * Dump the L1 shared buffer.
+ */
+void tf_dump_l1_shared_buffer(struct tf_l1_shared_buffer *buffer)
+{
+	dprintk(KERN_INFO
+		"buffer@%p:\n"
+		#ifndef CONFIG_TF_ZEBRA
+		"  config_flag_s=%08X\n"
+		#endif
+		"  version_description=%64s\n"
+		"  status_s=%08X\n"
+		"  sync_serial_n=%08X\n"
+		"  sync_serial_s=%08X\n"
+		"  time_n[0]=%016llX\n"
+		"  time_n[1]=%016llX\n"
+		"  timeout_s[0]=%016llX\n"
+		"  timeout_s[1]=%016llX\n"
+		"  first_command=%08X\n"
+		"  first_free_command=%08X\n"
+		"  first_answer=%08X\n"
+		"  first_free_answer=%08X\n\n",
+		buffer,
+		#ifndef CONFIG_TF_ZEBRA
+		buffer->config_flag_s,
+		#endif
+		buffer->version_description,
+		buffer->status_s,
+		buffer->sync_serial_n,
+		buffer->sync_serial_s,
+		buffer->time_n[0],
+		buffer->time_n[1],
+		buffer->timeout_s[0],
+		buffer->timeout_s[1],
+		buffer->first_command,
+		buffer->first_free_command,
+		buffer->first_answer,
+		buffer->first_free_answer);
+}
+
+
+/*
+ * Dump the specified SChannel message using dprintk.
+ */
+void tf_dump_command(union tf_command *command)
+{
+	u32 i;
+
+	dprintk(KERN_INFO "message@%p:\n", command);
+
+	switch (command->header.message_type) {
+	case TF_MESSAGE_TYPE_CREATE_DEVICE_CONTEXT:
+		dprintk(KERN_INFO
+			"   message_size             = 0x%02X\n"
+			"   message_type             = 0x%02X "
+				"TF_MESSAGE_TYPE_CREATE_DEVICE_CONTEXT\n"
+			"   operation_id             = 0x%08X\n"
+			"   device_context_id         = 0x%08X\n",
+			command->header.message_size,
+			command->header.message_type,
+			command->header.operation_id,
+			command->create_device_context.device_context_id
+		);
+		break;
+
+	case TF_MESSAGE_TYPE_DESTROY_DEVICE_CONTEXT:
+		dprintk(KERN_INFO
+			"   message_size    = 0x%02X\n"
+			"   message_type    = 0x%02X "
+				"TF_MESSAGE_TYPE_DESTROY_DEVICE_CONTEXT\n"
+			"   operation_id    = 0x%08X\n"
+			"   device_context  = 0x%08X\n",
+			command->header.message_size,
+			command->header.message_type,
+			command->header.operation_id,
+			command->destroy_device_context.device_context);
+		break;
+
+	case TF_MESSAGE_TYPE_OPEN_CLIENT_SESSION:
+		dprintk(KERN_INFO
+			"   message_size                = 0x%02X\n"
+			"   message_type                = 0x%02X "
+				"TF_MESSAGE_TYPE_OPEN_CLIENT_SESSION\n"
+			"   param_types                 = 0x%04X\n"
+			"   operation_id                = 0x%08X\n"
+			"   device_context              = 0x%08X\n"
+			"   cancellation_id             = 0x%08X\n"
+			"   timeout                    = 0x%016llX\n"
+			"   destination_uuid            = "
+				"%08X-%04X-%04X-%02X%02X-"
+				"%02X%02X%02X%02X%02X%02X\n",
+			command->header.message_size,
+			command->header.message_type,
+			command->open_client_session.param_types,
+			command->header.operation_id,
+			command->open_client_session.device_context,
+			command->open_client_session.cancellation_id,
+			command->open_client_session.timeout,
+			command->open_client_session.destination_uuid.
+				time_low,
+			command->open_client_session.destination_uuid.
+				time_mid,
+			command->open_client_session.destination_uuid.
+				time_hi_and_version,
+			command->open_client_session.destination_uuid.
+				clock_seq_and_node[0],
+			command->open_client_session.destination_uuid.
+				clock_seq_and_node[1],
+			command->open_client_session.destination_uuid.
+				clock_seq_and_node[2],
+			command->open_client_session.destination_uuid.
+				clock_seq_and_node[3],
+			command->open_client_session.destination_uuid.
+				clock_seq_and_node[4],
+			command->open_client_session.destination_uuid.
+				clock_seq_and_node[5],
+			command->open_client_session.destination_uuid.
+				clock_seq_and_node[6],
+			command->open_client_session.destination_uuid.
+				clock_seq_and_node[7]
+		);
+
+		for (i = 0; i < 4; i++) {
+			uint32_t *param = (uint32_t *) &command->
+				open_client_session.params[i];
+			dprintk(KERN_INFO "   params[%d] = "
+				"0x%08X:0x%08X:0x%08X\n",
+				i, param[0], param[1], param[2]);
+		}
+
+		switch (TF_LOGIN_GET_MAIN_TYPE(
+			command->open_client_session.login_type)) {
+		case TF_LOGIN_PUBLIC:
+			dprintk(
+				KERN_INFO "   login_type               = "
+					"TF_LOGIN_PUBLIC\n");
+			break;
+		case TF_LOGIN_USER:
+			dprintk(
+				KERN_INFO "   login_type               = "
+					"TF_LOGIN_USER\n");
+			break;
+		 case TF_LOGIN_GROUP:
+			dprintk(
+				KERN_INFO "   login_type               = "
+					"TF_LOGIN_GROUP\n");
+			break;
+		case TF_LOGIN_APPLICATION:
+			dprintk(
+				KERN_INFO "   login_type               = "
+					"TF_LOGIN_APPLICATION\n");
+			break;
+		case TF_LOGIN_APPLICATION_USER:
+			dprintk(
+				KERN_INFO "   login_type               = "
+					"TF_LOGIN_APPLICATION_USER\n");
+			break;
+		case TF_LOGIN_APPLICATION_GROUP:
+			dprintk(
+				KERN_INFO "   login_type               = "
+					"TF_LOGIN_APPLICATION_GROUP\n");
+			break;
+		case TF_LOGIN_AUTHENTICATION:
+			dprintk(
+				KERN_INFO "   login_type               = "
+					"TF_LOGIN_AUTHENTICATION\n");
+			break;
+		case TF_LOGIN_PRIVILEGED:
+			dprintk(
+				KERN_INFO "   login_type               = "
+					"TF_LOGIN_PRIVILEGED\n");
+			break;
+		case TF_LOGIN_PRIVILEGED_KERNEL:
+			dprintk(
+				KERN_INFO "   login_type               = "
+					"TF_LOGIN_PRIVILEGED_KERNEL\n");
+			break;
+		default:
+			dprintk(
+				KERN_ERR "   login_type               = "
+					"0x%08X (Unknown login type)\n",
+				command->open_client_session.login_type);
+			break;
+		}
+
+		dprintk(
+			KERN_INFO "   login_data               = ");
+		for (i = 0; i < 20; i++)
+			dprintk(
+				KERN_INFO "%d",
+				command->open_client_session.
+					login_data[i]);
+		dprintk("\n");
+		break;
+
+	case TF_MESSAGE_TYPE_CLOSE_CLIENT_SESSION:
+		dprintk(KERN_INFO
+			"   message_size                = 0x%02X\n"
+			"   message_type                = 0x%02X "
+				"TF_MESSAGE_TYPE_CLOSE_CLIENT_SESSION\n"
+			"   operation_id                = 0x%08X\n"
+			"   device_context              = 0x%08X\n"
+			"   client_session              = 0x%08X\n",
+			command->header.message_size,
+			command->header.message_type,
+			command->header.operation_id,
+			command->close_client_session.device_context,
+			command->close_client_session.client_session
+		);
+		break;
+
+	case TF_MESSAGE_TYPE_REGISTER_SHARED_MEMORY:
+		dprintk(KERN_INFO
+			"   message_size             = 0x%02X\n"
+			"   message_type             = 0x%02X "
+				"TF_MESSAGE_TYPE_REGISTER_SHARED_MEMORY\n"
+			"   memory_flags             = 0x%04X\n"
+			"   operation_id             = 0x%08X\n"
+			"   device_context           = 0x%08X\n"
+			"   block_id                 = 0x%08X\n"
+			"   shared_mem_size           = 0x%08X\n"
+			"   shared_mem_start_offset    = 0x%08X\n"
+			"   shared_mem_descriptors[0] = 0x%08X\n"
+			"   shared_mem_descriptors[1] = 0x%08X\n"
+			"   shared_mem_descriptors[2] = 0x%08X\n"
+			"   shared_mem_descriptors[3] = 0x%08X\n"
+			"   shared_mem_descriptors[4] = 0x%08X\n"
+			"   shared_mem_descriptors[5] = 0x%08X\n"
+			"   shared_mem_descriptors[6] = 0x%08X\n"
+			"   shared_mem_descriptors[7] = 0x%08X\n",
+			command->header.message_size,
+			command->header.message_type,
+			command->register_shared_memory.memory_flags,
+			command->header.operation_id,
+			command->register_shared_memory.device_context,
+			command->register_shared_memory.block_id,
+			command->register_shared_memory.shared_mem_size,
+			command->register_shared_memory.
+				shared_mem_start_offset,
+			command->register_shared_memory.
+				shared_mem_descriptors[0],
+			command->register_shared_memory.
+				shared_mem_descriptors[1],
+			command->register_shared_memory.
+				shared_mem_descriptors[2],
+			command->register_shared_memory.
+				shared_mem_descriptors[3],
+			command->register_shared_memory.
+				shared_mem_descriptors[4],
+			command->register_shared_memory.
+				shared_mem_descriptors[5],
+			command->register_shared_memory.
+				shared_mem_descriptors[6],
+			command->register_shared_memory.
+				shared_mem_descriptors[7]);
+		break;
+
+	case TF_MESSAGE_TYPE_RELEASE_SHARED_MEMORY:
+		dprintk(KERN_INFO
+			"   message_size    = 0x%02X\n"
+			"   message_type    = 0x%02X "
+				"TF_MESSAGE_TYPE_RELEASE_SHARED_MEMORY\n"
+			"   operation_id    = 0x%08X\n"
+			"   device_context  = 0x%08X\n"
+			"   block          = 0x%08X\n",
+			command->header.message_size,
+			command->header.message_type,
+			command->header.operation_id,
+			command->release_shared_memory.device_context,
+			command->release_shared_memory.block);
+		break;
+
+	case TF_MESSAGE_TYPE_INVOKE_CLIENT_COMMAND:
+		dprintk(KERN_INFO
+			 "   message_size                = 0x%02X\n"
+			"   message_type                = 0x%02X "
+				"TF_MESSAGE_TYPE_INVOKE_CLIENT_COMMAND\n"
+			"   param_types                 = 0x%04X\n"
+			"   operation_id                = 0x%08X\n"
+			"   device_context              = 0x%08X\n"
+			"   client_session              = 0x%08X\n"
+			"   timeout                    = 0x%016llX\n"
+			"   cancellation_id             = 0x%08X\n"
+			"   client_command_identifier    = 0x%08X\n",
+			command->header.message_size,
+			command->header.message_type,
+			command->invoke_client_command.param_types,
+			command->header.operation_id,
+			command->invoke_client_command.device_context,
+			command->invoke_client_command.client_session,
+			command->invoke_client_command.timeout,
+			command->invoke_client_command.cancellation_id,
+			command->invoke_client_command.
+				client_command_identifier
+		);
+
+		for (i = 0; i < 4; i++) {
+			uint32_t *param = (uint32_t *) &command->
+				open_client_session.params[i];
+			dprintk(KERN_INFO "   params[%d] = "
+				"0x%08X:0x%08X:0x%08X\n", i,
+				param[0], param[1], param[2]);
+		}
+		break;
+
+	case TF_MESSAGE_TYPE_CANCEL_CLIENT_COMMAND:
+		dprintk(KERN_INFO
+			"   message_size       = 0x%02X\n"
+			"   message_type       = 0x%02X "
+				"TF_MESSAGE_TYPE_CANCEL_CLIENT_COMMAND\n"
+			"   operation_id       = 0x%08X\n"
+			"   device_context     = 0x%08X\n"
+			"   client_session     = 0x%08X\n",
+			command->header.message_size,
+			command->header.message_type,
+			command->header.operation_id,
+			command->cancel_client_operation.device_context,
+			command->cancel_client_operation.client_session);
+		break;
+
+	case TF_MESSAGE_TYPE_MANAGEMENT:
+		dprintk(KERN_INFO
+			"   message_size             = 0x%02X\n"
+			"   message_type             = 0x%02X "
+				"TF_MESSAGE_TYPE_MANAGEMENT\n"
+			"   operation_id             = 0x%08X\n"
+			"   command                 = 0x%08X\n"
+			"   w3b_size                 = 0x%08X\n"
+			"   w3b_start_offset          = 0x%08X\n",
+			command->header.message_size,
+			command->header.message_type,
+			command->header.operation_id,
+			command->management.command,
+			command->management.w3b_size,
+			command->management.w3b_start_offset);
+		break;
+
+	default:
+		dprintk(
+			KERN_ERR "   message_type = 0x%08X "
+				"(Unknown message type)\n",
+			command->header.message_type);
+		break;
+	}
+}
+
+
+/*
+ * Dump the specified SChannel answer using dprintk.
+ */
+void tf_dump_answer(union tf_answer *answer)
+{
+	u32 i;
+	dprintk(
+		KERN_INFO "answer@%p:\n",
+		answer);
+
+	switch (answer->header.message_type) {
+	case TF_MESSAGE_TYPE_CREATE_DEVICE_CONTEXT:
+		dprintk(KERN_INFO
+			"   message_size    = 0x%02X\n"
+			"   message_type    = 0x%02X "
+				"tf_answer_create_device_context\n"
+			"   operation_id    = 0x%08X\n"
+			"   error_code      = 0x%08X\n"
+			"   device_context  = 0x%08X\n",
+			answer->header.message_size,
+			answer->header.message_type,
+			answer->header.operation_id,
+			answer->create_device_context.error_code,
+			answer->create_device_context.device_context);
+		break;
+
+	case TF_MESSAGE_TYPE_DESTROY_DEVICE_CONTEXT:
+		dprintk(KERN_INFO
+			"   message_size     = 0x%02X\n"
+			"   message_type     = 0x%02X "
+				"ANSWER_DESTROY_DEVICE_CONTEXT\n"
+			"   operation_id     = 0x%08X\n"
+			"   error_code       = 0x%08X\n"
+			"   device_context_id = 0x%08X\n",
+			answer->header.message_size,
+			answer->header.message_type,
+			answer->header.operation_id,
+			answer->destroy_device_context.error_code,
+			answer->destroy_device_context.device_context_id);
+		break;
+
+
+	case TF_MESSAGE_TYPE_OPEN_CLIENT_SESSION:
+		dprintk(KERN_INFO
+			"   message_size      = 0x%02X\n"
+			"   message_type      = 0x%02X "
+				"tf_answer_open_client_session\n"
+			"   error_origin     = 0x%02X\n"
+			"   operation_id      = 0x%08X\n"
+			"   error_code        = 0x%08X\n"
+			"   client_session    = 0x%08X\n",
+			answer->header.message_size,
+			answer->header.message_type,
+			answer->open_client_session.error_origin,
+			answer->header.operation_id,
+			answer->open_client_session.error_code,
+			answer->open_client_session.client_session);
+		for (i = 0; i < 4; i++) {
+			dprintk(KERN_INFO "   answers[%d]=0x%08X:0x%08X\n",
+				i,
+				answer->open_client_session.answers[i].
+					value.a,
+				answer->open_client_session.answers[i].
+					value.b);
+		}
+		break;
+
+	case TF_MESSAGE_TYPE_CLOSE_CLIENT_SESSION:
+		dprintk(KERN_INFO
+			"   message_size      = 0x%02X\n"
+			"   message_type      = 0x%02X "
+				"ANSWER_CLOSE_CLIENT_SESSION\n"
+			"   operation_id      = 0x%08X\n"
+			"   error_code        = 0x%08X\n",
+			answer->header.message_size,
+			answer->header.message_type,
+			answer->header.operation_id,
+			answer->close_client_session.error_code);
+		break;
+
+	case TF_MESSAGE_TYPE_REGISTER_SHARED_MEMORY:
+		dprintk(KERN_INFO
+			"   message_size    = 0x%02X\n"
+			"   message_type    = 0x%02X "
+				"tf_answer_register_shared_memory\n"
+			"   operation_id    = 0x%08X\n"
+			"   error_code      = 0x%08X\n"
+			"   block          = 0x%08X\n",
+			answer->header.message_size,
+			answer->header.message_type,
+			answer->header.operation_id,
+			answer->register_shared_memory.error_code,
+			answer->register_shared_memory.block);
+		break;
+
+	case TF_MESSAGE_TYPE_RELEASE_SHARED_MEMORY:
+		dprintk(KERN_INFO
+			"   message_size    = 0x%02X\n"
+			"   message_type    = 0x%02X "
+				"ANSWER_RELEASE_SHARED_MEMORY\n"
+			"   operation_id    = 0x%08X\n"
+			"   error_code      = 0x%08X\n"
+			"   block_id        = 0x%08X\n",
+			answer->header.message_size,
+			answer->header.message_type,
+			answer->header.operation_id,
+			answer->release_shared_memory.error_code,
+			answer->release_shared_memory.block_id);
+		break;
+
+	case TF_MESSAGE_TYPE_INVOKE_CLIENT_COMMAND:
+		dprintk(KERN_INFO
+			"   message_size      = 0x%02X\n"
+			"   message_type      = 0x%02X "
+				"tf_answer_invoke_client_command\n"
+			"   error_origin     = 0x%02X\n"
+			"   operation_id      = 0x%08X\n"
+			"   error_code        = 0x%08X\n",
+			answer->header.message_size,
+			answer->header.message_type,
+			answer->invoke_client_command.error_origin,
+			answer->header.operation_id,
+			answer->invoke_client_command.error_code
+			);
+		for (i = 0; i < 4; i++) {
+			dprintk(KERN_INFO "   answers[%d]=0x%08X:0x%08X\n",
+				i,
+				answer->invoke_client_command.answers[i].
+					value.a,
+				answer->invoke_client_command.answers[i].
+					value.b);
+		}
+		break;
+
+	case TF_MESSAGE_TYPE_CANCEL_CLIENT_COMMAND:
+		dprintk(KERN_INFO
+			"   message_size      = 0x%02X\n"
+			"   message_type      = 0x%02X "
+				"TF_ANSWER_CANCEL_CLIENT_COMMAND\n"
+			"   operation_id      = 0x%08X\n"
+			"   error_code        = 0x%08X\n",
+			answer->header.message_size,
+			answer->header.message_type,
+			answer->header.operation_id,
+			answer->cancel_client_operation.error_code);
+		break;
+
+	case TF_MESSAGE_TYPE_MANAGEMENT:
+		dprintk(KERN_INFO
+			"   message_size      = 0x%02X\n"
+			"   message_type      = 0x%02X "
+				"TF_MESSAGE_TYPE_MANAGEMENT\n"
+			"   operation_id      = 0x%08X\n"
+			"   error_code        = 0x%08X\n",
+			answer->header.message_size,
+			answer->header.message_type,
+			answer->header.operation_id,
+			answer->header.error_code);
+		break;
+
+	default:
+		dprintk(
+			KERN_ERR "   message_type = 0x%02X "
+				"(Unknown message type)\n",
+			answer->header.message_type);
+		break;
+
+	}
+}
+
+#endif  /* defined(TF_DRIVER_DEBUG_SUPPORT) */
+
+/*----------------------------------------------------------------------------
+ * SHA-1 implementation
+ * This is taken from the Linux kernel source crypto/sha1.c
+ *----------------------------------------------------------------------------*/
+
+struct sha1_ctx {
+	u64 count;
+	u32 state[5];
+	u8 buffer[64];
+};
+
+static inline u32 rol(u32 value, u32 bits)
+{
+	return ((value) << (bits)) | ((value) >> (32 - (bits)));
+}
+
+/* blk0() and blk() perform the initial expand. */
+/* I got the idea of expanding during the round function from SSLeay */
+#define blk0(i) block32[i]
+
+#define blk(i) (block32[i & 15] = rol( \
+	block32[(i + 13) & 15] ^ block32[(i + 8) & 15] ^ \
+	block32[(i + 2) & 15] ^ block32[i & 15], 1))
+
+/* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */
+#define R0(v, w, x, y, z, i) do { \
+	z += ((w & (x ^ y)) ^ y) + blk0(i) + 0x5A827999 + rol(v, 5); \
+	w = rol(w, 30); } while (0)
+
+#define R1(v, w, x, y, z, i) do { \
+	z += ((w & (x ^ y)) ^ y) + blk(i) + 0x5A827999 + rol(v, 5); \
+	w = rol(w, 30); } while (0)
+
+#define R2(v, w, x, y, z, i) do { \
+	z += (w ^ x ^ y) + blk(i) + 0x6ED9EBA1 + rol(v, 5); \
+	w = rol(w, 30); } while (0)
+
+#define R3(v, w, x, y, z, i) do { \
+	z += (((w | x) & y) | (w & x)) + blk(i) + 0x8F1BBCDC + rol(v, 5); \
+	w = rol(w, 30); } while (0)
+
+#define R4(v, w, x, y, z, i) do { \
+	z += (w ^ x ^ y) + blk(i) + 0xCA62C1D6 + rol(v, 5); \
+	w = rol(w, 30); } while (0)
+
+
+/* Hash a single 512-bit block. This is the core of the algorithm. */
+static void sha1_transform(u32 *state, const u8 *in)
+{
+	u32 a, b, c, d, e;
+	u32 block32[16];
+
+	/* convert/copy data to workspace */
+	for (a = 0; a < sizeof(block32)/sizeof(u32); a++)
+		block32[a] = ((u32) in[4 * a]) << 24 |
+			     ((u32) in[4 * a + 1]) << 16 |
+			     ((u32) in[4 * a + 2]) <<  8 |
+			     ((u32) in[4 * a + 3]);
+
+	/* Copy context->state[] to working vars */
+	a = state[0];
+	b = state[1];
+	c = state[2];
+	d = state[3];
+	e = state[4];
+
+	/* 4 rounds of 20 operations each. Loop unrolled. */
+	R0(a, b, c, d, e, 0); R0(e, a, b, c, d, 1);
+	R0(d, e, a, b, c, 2); R0(c, d, e, a, b, 3);
+	R0(b, c, d, e, a, 4); R0(a, b, c, d, e, 5);
+	R0(e, a, b, c, d, 6); R0(d, e, a, b, c, 7);
+	R0(c, d, e, a, b, 8); R0(b, c, d, e, a, 9);
+	R0(a, b, c, d, e, 10); R0(e, a, b, c, d, 11);
+	R0(d, e, a, b, c, 12); R0(c, d, e, a, b, 13);
+	R0(b, c, d, e, a, 14); R0(a, b, c, d, e, 15);
+
+	R1(e, a, b, c, d, 16); R1(d, e, a, b, c, 17);
+	R1(c, d, e, a, b, 18); R1(b, c, d, e, a, 19);
+
+	R2(a, b, c, d, e, 20); R2(e, a, b, c, d, 21);
+	R2(d, e, a, b, c, 22); R2(c, d, e, a, b, 23);
+	R2(b, c, d, e, a, 24); R2(a, b, c, d, e, 25);
+	R2(e, a, b, c, d, 26); R2(d, e, a, b, c, 27);
+	R2(c, d, e, a, b, 28); R2(b, c, d, e, a, 29);
+	R2(a, b, c, d, e, 30); R2(e, a, b, c, d, 31);
+	R2(d, e, a, b, c, 32); R2(c, d, e, a, b, 33);
+	R2(b, c, d, e, a, 34); R2(a, b, c, d, e, 35);
+	R2(e, a, b, c, d, 36); R2(d, e, a, b, c, 37);
+	R2(c, d, e, a, b, 38); R2(b, c, d, e, a, 39);
+
+	R3(a, b, c, d, e, 40); R3(e, a, b, c, d, 41);
+	R3(d, e, a, b, c, 42); R3(c, d, e, a, b, 43);
+	R3(b, c, d, e, a, 44); R3(a, b, c, d, e, 45);
+	R3(e, a, b, c, d, 46); R3(d, e, a, b, c, 47);
+	R3(c, d, e, a, b, 48); R3(b, c, d, e, a, 49);
+	R3(a, b, c, d, e, 50); R3(e, a, b, c, d, 51);
+	R3(d, e, a, b, c, 52); R3(c, d, e, a, b, 53);
+	R3(b, c, d, e, a, 54); R3(a, b, c, d, e, 55);
+	R3(e, a, b, c, d, 56); R3(d, e, a, b, c, 57);
+	R3(c, d, e, a, b, 58); R3(b, c, d, e, a, 59);
+
+	R4(a, b, c, d, e, 60); R4(e, a, b, c, d, 61);
+	R4(d, e, a, b, c, 62); R4(c, d, e, a, b, 63);
+	R4(b, c, d, e, a, 64); R4(a, b, c, d, e, 65);
+	R4(e, a, b, c, d, 66); R4(d, e, a, b, c, 67);
+	R4(c, d, e, a, b, 68); R4(b, c, d, e, a, 69);
+	R4(a, b, c, d, e, 70); R4(e, a, b, c, d, 71);
+	R4(d, e, a, b, c, 72); R4(c, d, e, a, b, 73);
+	R4(b, c, d, e, a, 74); R4(a, b, c, d, e, 75);
+	R4(e, a, b, c, d, 76); R4(d, e, a, b, c, 77);
+	R4(c, d, e, a, b, 78); R4(b, c, d, e, a, 79);
+
+	/* Add the working vars back into context.state[] */
+	state[0] += a;
+	state[1] += b;
+	state[2] += c;
+	state[3] += d;
+	state[4] += e;
+	/* Wipe variables */
+	a = b = c = d = e = 0;
+	memset(block32, 0x00, sizeof(block32));
+}
+
+
+static void sha1_init(void *ctx)
+{
+	struct sha1_ctx *sctx = ctx;
+	static const struct sha1_ctx initstate = {
+		0,
+		{ 0x67452301, 0xEFCDAB89, 0x98BADCFE, 0x10325476, 0xC3D2E1F0 },
+		{ 0, }
+	};
+
+	*sctx = initstate;
+}
+
+
+static void sha1_update(void *ctx, const u8 *data, unsigned int len)
+{
+	struct sha1_ctx *sctx = ctx;
+	unsigned int i, j;
+
+	j = (sctx->count >> 3) & 0x3f;
+	sctx->count += len << 3;
+
+	if ((j + len) > 63) {
+		memcpy(&sctx->buffer[j], data, (i = 64 - j));
+		sha1_transform(sctx->state, sctx->buffer);
+		for ( ; i + 63 < len; i += 64)
+			sha1_transform(sctx->state, &data[i]);
+		j = 0;
+	} else
+		i = 0;
+	memcpy(&sctx->buffer[j], &data[i], len - i);
+}
+
+
+/* Add padding and return the message digest. */
+static void sha1_final(void *ctx, u8 *out)
+{
+	struct sha1_ctx *sctx = ctx;
+	u32 i, j, index, padlen;
+	u64 t;
+	u8 bits[8] = { 0, };
+	static const u8 padding[64] = { 0x80, };
+
+	t = sctx->count;
+	bits[7] = 0xff & t; t >>= 8;
+	bits[6] = 0xff & t; t >>= 8;
+	bits[5] = 0xff & t; t >>= 8;
+	bits[4] = 0xff & t; t >>= 8;
+	bits[3] = 0xff & t; t >>= 8;
+	bits[2] = 0xff & t; t >>= 8;
+	bits[1] = 0xff & t; t >>= 8;
+	bits[0] = 0xff & t;
+
+	/* Pad out to 56 mod 64 */
+	index = (sctx->count >> 3) & 0x3f;
+	padlen = (index < 56) ? (56 - index) : ((64+56) - index);
+	sha1_update(sctx, padding, padlen);
+
+	/* Append length */
+	sha1_update(sctx, bits, sizeof(bits));
+
+	/* Store state in digest */
+	for (i = j = 0; i < 5; i++, j += 4) {
+		u32 t2 = sctx->state[i];
+		out[j+3] = t2 & 0xff; t2 >>= 8;
+		out[j+2] = t2 & 0xff; t2 >>= 8;
+		out[j+1] = t2 & 0xff; t2 >>= 8;
+		out[j] = t2 & 0xff;
+	}
+
+	/* Wipe context */
+	memset(sctx, 0, sizeof(*sctx));
+}
+
+
+
+
+/*----------------------------------------------------------------------------
+ * Process identification
+ *----------------------------------------------------------------------------*/
+
+/* This function generates a processes hash table for authentication */
+int tf_get_current_process_hash(void *hash)
+{
+	int result = 0;
+	void *buffer;
+	struct mm_struct *mm;
+	struct vm_area_struct *vma;
+
+	buffer = internal_kmalloc(PAGE_SIZE, GFP_KERNEL);
+	if (buffer == NULL) {
+		dprintk(
+			KERN_ERR "tf_get_current_process_hash:"
+			" Out of memory for buffer!\n");
+		return -ENOMEM;
+	}
+
+	mm = current->mm;
+
+	down_read(&(mm->mmap_sem));
+	for (vma = mm->mmap; vma != NULL; vma = vma->vm_next) {
+		if ((vma->vm_flags & VM_EXECUTABLE) != 0 && vma->vm_file
+				!= NULL) {
+			struct dentry *dentry;
+			unsigned long start;
+			unsigned long cur;
+			unsigned long end;
+			struct sha1_ctx sha1;
+
+			dentry = dget(vma->vm_file->f_dentry);
+
+			dprintk(
+				KERN_DEBUG "tf_get_current_process_hash: "
+					"Found executable VMA for inode %lu "
+					"(%lu bytes).\n",
+					dentry->d_inode->i_ino,
+					(unsigned long) (dentry->d_inode->
+						i_size));
+
+			start = do_mmap(vma->vm_file, 0,
+				dentry->d_inode->i_size,
+				PROT_READ | PROT_WRITE | PROT_EXEC,
+				MAP_PRIVATE, 0);
+			if (start < 0) {
+				dprintk(
+					KERN_ERR "tf_get_current_process_hash"
+					"Hash: do_mmap failed (error %d)!\n",
+					(int) start);
+				dput(dentry);
+				result = -EFAULT;
+				goto vma_out;
+			}
+
+			end = start + dentry->d_inode->i_size;
+
+			sha1_init(&sha1);
+			cur = start;
+			while (cur < end) {
+				unsigned long chunk;
+
+				chunk = end - cur;
+				if (chunk > PAGE_SIZE)
+					chunk = PAGE_SIZE;
+				if (copy_from_user(buffer, (const void *) cur,
+						chunk) != 0) {
+					dprintk(
+						KERN_ERR "tf_get_current_"
+						"process_hash: copy_from_user "
+						"failed!\n");
+					result = -EINVAL;
+					(void) do_munmap(mm, start,
+						dentry->d_inode->i_size);
+					dput(dentry);
+					goto vma_out;
+				}
+				sha1_update(&sha1, buffer, chunk);
+				cur += chunk;
+			}
+			sha1_final(&sha1, hash);
+			result = 0;
+
+			(void) do_munmap(mm, start, dentry->d_inode->i_size);
+			dput(dentry);
+			break;
+		}
+	}
+vma_out:
+	up_read(&(mm->mmap_sem));
+
+	internal_kfree(buffer);
+
+	if (result == -ENOENT)
+		dprintk(
+			KERN_ERR "tf_get_current_process_hash: "
+				"No executable VMA found for process!\n");
+	return result;
+}
+
+#ifndef CONFIG_ANDROID
+/* This function hashes the path of the current application.
+ * If data = NULL ,nothing else is added to the hash
+		else add data to the hash
+  */
+int tf_hash_application_path_and_data(char *buffer, void *data,
+	u32 data_len)
+{
+	int result = -ENOENT;
+	char *tmp = NULL;
+	struct mm_struct *mm;
+	struct vm_area_struct *vma;
+
+	tmp = internal_kmalloc(PAGE_SIZE, GFP_KERNEL);
+	if (tmp == NULL) {
+		result = -ENOMEM;
+		goto end;
+	}
+
+	mm = current->mm;
+
+	down_read(&(mm->mmap_sem));
+	for (vma = mm->mmap; vma != NULL; vma = vma->vm_next) {
+		if ((vma->vm_flags & VM_EXECUTABLE) != 0
+				&& vma->vm_file != NULL) {
+			struct path *path;
+			char *endpath;
+			size_t pathlen;
+			struct sha1_ctx sha1;
+			u8 hash[SHA1_DIGEST_SIZE];
+
+			path = &vma->vm_file->f_path;
+
+			endpath = d_path(path, tmp, PAGE_SIZE);
+			if (IS_ERR(path)) {
+				result = PTR_ERR(endpath);
+				up_read(&(mm->mmap_sem));
+				goto end;
+			}
+			pathlen = (tmp + PAGE_SIZE) - endpath;
+
+#ifdef CONFIG_TF_DRIVER_DEBUG_SUPPORT
+			{
+				char *c;
+				dprintk(KERN_DEBUG "current process path = ");
+				for (c = endpath;
+				     c < tmp + PAGE_SIZE;
+				     c++)
+					dprintk("%c", *c);
+
+				dprintk(", uid=%d, euid=%d\n", current_uid(),
+					current_euid());
+			}
+#endif /* defined(CONFIG_TF_DRIVER_DEBUG_SUPPORT) */
+
+			sha1_init(&sha1);
+			sha1_update(&sha1, endpath, pathlen);
+			if (data != NULL) {
+				dprintk(KERN_INFO "current process path: "
+					"Hashing additional data\n");
+				sha1_update(&sha1, data, data_len);
+			}
+			sha1_final(&sha1, hash);
+			memcpy(buffer, hash, sizeof(hash));
+
+			result = 0;
+
+			break;
+		}
+	}
+	up_read(&(mm->mmap_sem));
+
+end:
+	if (tmp != NULL)
+		internal_kfree(tmp);
+
+	return result;
+}
+#endif /* !CONFIG_ANDROID */
+
+void *internal_kmalloc(size_t size, int priority)
+{
+	void *ptr;
+	struct tf_device *dev = tf_get_device();
+
+	ptr = kmalloc(size, priority);
+
+	if (ptr != NULL)
+		atomic_inc(
+			&dev->stats.stat_memories_allocated);
+
+	return ptr;
+}
+
+void internal_kfree(void *ptr)
+{
+	struct tf_device *dev = tf_get_device();
+
+	if (ptr != NULL)
+		atomic_dec(
+			&dev->stats.stat_memories_allocated);
+	return kfree(ptr);
+}
+
+void internal_vunmap(void *ptr)
+{
+	struct tf_device *dev = tf_get_device();
+
+	if (ptr != NULL)
+		atomic_dec(
+			&dev->stats.stat_memories_allocated);
+
+	vunmap((void *) (((unsigned int)ptr) & 0xFFFFF000));
+}
+
+void *internal_vmalloc(size_t size)
+{
+	void *ptr;
+	struct tf_device *dev = tf_get_device();
+
+	ptr = vmalloc(size);
+
+	if (ptr != NULL)
+		atomic_inc(
+			&dev->stats.stat_memories_allocated);
+
+	return ptr;
+}
+
+void internal_vfree(void *ptr)
+{
+	struct tf_device *dev = tf_get_device();
+
+	if (ptr != NULL)
+		atomic_dec(
+			&dev->stats.stat_memories_allocated);
+	return vfree(ptr);
+}
+
+unsigned long internal_get_zeroed_page(int priority)
+{
+	unsigned long result;
+	struct tf_device *dev = tf_get_device();
+
+	result = get_zeroed_page(priority);
+
+	if (result != 0)
+		atomic_inc(&dev->stats.
+				stat_pages_allocated);
+
+	return result;
+}
+
+void internal_free_page(unsigned long addr)
+{
+	struct tf_device *dev = tf_get_device();
+
+	if (addr != 0)
+		atomic_dec(
+			&dev->stats.stat_pages_allocated);
+	return free_page(addr);
+}
+
+int internal_get_user_pages(
+		struct task_struct *tsk,
+		struct mm_struct *mm,
+		unsigned long start,
+		int len,
+		int write,
+		int force,
+		struct page **pages,
+		struct vm_area_struct **vmas)
+{
+	int result;
+	struct tf_device *dev = tf_get_device();
+
+	result = get_user_pages(
+		tsk,
+		mm,
+		start,
+		len,
+		write,
+		force,
+		pages,
+		vmas);
+
+	if (result > 0)
+		atomic_add(result,
+			&dev->stats.stat_pages_locked);
+
+	return result;
+}
+
+void internal_get_page(struct page *page)
+{
+	struct tf_device *dev = tf_get_device();
+
+	atomic_inc(&dev->stats.stat_pages_locked);
+
+	get_page(page);
+}
+
+void internal_page_cache_release(struct page *page)
+{
+	struct tf_device *dev = tf_get_device();
+
+	atomic_dec(&dev->stats.stat_pages_locked);
+
+	page_cache_release(page);
+}
+
+
diff --git a/security/tf_driver/tf_util.h b/security/tf_driver/tf_util.h
new file mode 100644
index 000000000000..14bc78952d86
--- /dev/null
+++ b/security/tf_driver/tf_util.h
@@ -0,0 +1,122 @@
+/**
+ * Copyright (c) 2011 Trusted Logic S.A.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef __TF_UTIL_H__
+#define __TF_UTIL_H__
+
+#include <linux/spinlock.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/crypto.h>
+#include <linux/mount.h>
+#include <linux/pagemap.h>
+#include <linux/vmalloc.h>
+#include <asm/byteorder.h>
+
+#include "tf_protocol.h"
+#include "tf_defs.h"
+
+/*----------------------------------------------------------------------------
+ * Debug printing routines
+ *----------------------------------------------------------------------------*/
+
+#ifdef CONFIG_TF_DRIVER_DEBUG_SUPPORT
+extern unsigned tf_debug_level;
+
+void address_cache_property(unsigned long va);
+
+#define dprintk(args...) ((void)(tf_debug_level >= 6 ? printk(args) : 0))
+#define dpr_info(args...) ((void)(tf_debug_level >= 3 ? pr_info(args) : 0))
+#define dpr_err(args...) ((void)(tf_debug_level >= 1 ? pr_err(args) : 0))
+#define INFO(fmt, args...) \
+	(void)dprintk(KERN_INFO "%s: " fmt "\n", __func__, ## args)
+#define WARNING(fmt, args...)  \
+	(tf_debug_level >= 3 ?						\
+	 printk(KERN_WARNING "%s: " fmt "\n", __func__, ## args) :	\
+	 (void)0)
+#define ERROR(fmt, args...) \
+	(tf_debug_level >= 1 ?						\
+	 printk(KERN_ERR "%s: " fmt "\n", __func__, ## args) :	\
+	 (void)0)
+void tf_trace_array(const char *fun, const char *msg,
+		    const void *ptr, size_t len);
+#define TF_TRACE_ARRAY(ptr, len) \
+	(tf_debug_level >= 7 ? \
+	 tf_trace_array(__func__, #ptr "/" #len, ptr, len) : \
+	 0)
+
+void tf_dump_l1_shared_buffer(struct tf_l1_shared_buffer *buffer);
+
+void tf_dump_command(union tf_command *command);
+
+void tf_dump_answer(union tf_answer *answer);
+
+#else /* defined(CONFIG_TF_DRIVER_DEBUG_SUPPORT) */
+
+#define dprintk(args...)  do { ; } while (0)
+#define dpr_info(args...)  do { ; } while (0)
+#define dpr_err(args...)  do { ; } while (0)
+#define INFO(fmt, args...) ((void)0)
+#define WARNING(fmt, args...) ((void)0)
+#define ERROR(fmt, args...) ((void)0)
+#define TF_TRACE_ARRAY(ptr, len) ((void)(ptr), (void)(len))
+#define tf_dump_l1_shared_buffer(buffer)  ((void) 0)
+#define tf_dump_command(command)  ((void) 0)
+#define tf_dump_answer(answer)  ((void) 0)
+
+#endif /* defined(CONFIG_TF_DRIVER_DEBUG_SUPPORT) */
+
+#define SHA1_DIGEST_SIZE	20
+
+/*----------------------------------------------------------------------------
+ * Process identification
+ *----------------------------------------------------------------------------*/
+
+int tf_get_current_process_hash(void *hash);
+
+#ifndef CONFIG_ANDROID
+int tf_hash_application_path_and_data(char *buffer, void *data, u32 data_len);
+#endif /* !CONFIG_ANDROID */
+
+/*----------------------------------------------------------------------------
+ * Statistic computation
+ *----------------------------------------------------------------------------*/
+
+void *internal_kmalloc(size_t size, int priority);
+void internal_kfree(void *ptr);
+void internal_vunmap(void *ptr);
+void *internal_vmalloc(size_t size);
+void internal_vfree(void *ptr);
+unsigned long internal_get_zeroed_page(int priority);
+void internal_free_page(unsigned long addr);
+int internal_get_user_pages(
+		struct task_struct *tsk,
+		struct mm_struct *mm,
+		unsigned long start,
+		int len,
+		int write,
+		int force,
+		struct page **pages,
+		struct vm_area_struct **vmas);
+void internal_get_page(struct page *page);
+void internal_page_cache_release(struct page *page);
+#endif  /* __TF_UTIL_H__ */
+