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+/*
+ * Copyright 2011 Tilera Corporation. 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, version 2.
+ *
+ * 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, GOOD TITLE or
+ * NON INFRINGEMENT. See the GNU General Public License for
+ * more details.
+ *
+ * This routine is a helper for migrating the home of a set of pages to
+ * a new cpu. See the documentation in homecache.c for more information.
+ */
+
+#include <linux/linkage.h>
+#include <linux/threads.h>
+#include <asm/page.h>
+#include <asm/thread_info.h>
+#include <asm/types.h>
+#include <asm/asm-offsets.h>
+#include <hv/hypervisor.h>
+
+ .text
+
+/*
+ * First, some definitions that apply to all the code in the file.
+ */
+
+/* Locals (caller-save) */
+#define r_tmp r10
+#define r_save_sp r11
+
+/* What we save where in the stack frame; must include all callee-saves. */
+#define FRAME_SP 8
+#define FRAME_R30 16
+#define FRAME_R31 24
+#define FRAME_R32 32
+#define FRAME_R33 40
+#define FRAME_SIZE 48
+
+
+
+
+/*
+ * On entry:
+ *
+ * r0 the new context PA to install (moved to r_context)
+ * r1 PTE to use for context access (moved to r_access)
+ * r2 ASID to use for new context (moved to r_asid)
+ * r3 pointer to cpumask with just this cpu set in it (r_my_cpumask)
+ */
+
+/* Arguments (caller-save) */
+#define r_context_in r0
+#define r_access_in r1
+#define r_asid_in r2
+#define r_my_cpumask r3
+
+/* Locals (callee-save); must not be more than FRAME_xxx above. */
+#define r_save_ics r30
+#define r_context r31
+#define r_access r32
+#define r_asid r33
+
+/*
+ * Caller-save locals and frame constants are the same as
+ * for homecache_migrate_stack_and_flush.
+ */
+
+STD_ENTRY(flush_and_install_context)
+ /*
+ * Create a stack frame; we can't touch it once we flush the
+ * cache until we install the new page table and flush the TLB.
+ */
+ {
+ move r_save_sp, sp
+ st sp, lr
+ addi sp, sp, -FRAME_SIZE
+ }
+ addi r_tmp, sp, FRAME_SP
+ {
+ st r_tmp, r_save_sp
+ addi r_tmp, sp, FRAME_R30
+ }
+ {
+ st r_tmp, r30
+ addi r_tmp, sp, FRAME_R31
+ }
+ {
+ st r_tmp, r31
+ addi r_tmp, sp, FRAME_R32
+ }
+ {
+ st r_tmp, r32
+ addi r_tmp, sp, FRAME_R33
+ }
+ st r_tmp, r33
+
+ /* Move some arguments to callee-save registers. */
+ {
+ move r_context, r_context_in
+ move r_access, r_access_in
+ }
+ move r_asid, r_asid_in
+
+ /* Disable interrupts, since we can't use our stack. */
+ {
+ mfspr r_save_ics, INTERRUPT_CRITICAL_SECTION
+ movei r_tmp, 1
+ }
+ mtspr INTERRUPT_CRITICAL_SECTION, r_tmp
+
+ /* First, flush our L2 cache. */
+ {
+ move r0, zero /* cache_pa */
+ moveli r1, hw2_last(HV_FLUSH_EVICT_L2) /* cache_control */
+ }
+ {
+ shl16insli r1, r1, hw1(HV_FLUSH_EVICT_L2)
+ move r2, r_my_cpumask /* cache_cpumask */
+ }
+ {
+ shl16insli r1, r1, hw0(HV_FLUSH_EVICT_L2)
+ move r3, zero /* tlb_va */
+ }
+ {
+ move r4, zero /* tlb_length */
+ move r5, zero /* tlb_pgsize */
+ }
+ {
+ move r6, zero /* tlb_cpumask */
+ move r7, zero /* asids */
+ }
+ {
+ move r8, zero /* asidcount */
+ jal hv_flush_remote
+ }
+ bnez r0, 1f
+
+ /* Now install the new page table. */
+ {
+ move r0, r_context
+ move r1, r_access
+ }
+ {
+ move r2, r_asid
+ movei r3, HV_CTX_DIRECTIO
+ }
+ jal hv_install_context
+ bnez r0, 1f
+
+ /* Finally, flush the TLB. */
+ {
+ movei r0, 0 /* preserve_global */
+ jal hv_flush_all
+ }
+
+1: /* Reset interrupts back how they were before. */
+ mtspr INTERRUPT_CRITICAL_SECTION, r_save_ics
+
+ /* Restore the callee-saved registers and return. */
+ addli lr, sp, FRAME_SIZE
+ {
+ ld lr, lr
+ addli r_tmp, sp, FRAME_R30
+ }
+ {
+ ld r30, r_tmp
+ addli r_tmp, sp, FRAME_R31
+ }
+ {
+ ld r31, r_tmp
+ addli r_tmp, sp, FRAME_R32
+ }
+ {
+ ld r32, r_tmp
+ addli r_tmp, sp, FRAME_R33
+ }
+ {
+ ld r33, r_tmp
+ addi sp, sp, FRAME_SIZE
+ }
+ jrp lr
+ STD_ENDPROC(flush_and_install_context)