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/*
* (C) Copyright 2010 - 2011
* NVIDIA Corporation <www.nvidia.com>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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
*/
#include <common.h>
#include <asm/io.h>
#include <asm/errno.h>
#include <asm/arch-tegra/ap20.h>
#include <asm/arch-tegra/fuse.h>
#include <asm/arch-tegra/bitfield.h>
#include <asm/arch-tegra/warmboot.h>
#include <asm/arch/gp_padctrl.h>
/*
* NOTE: If more than one of the following is enabled, only one of them will
* actually be used. RANDOM takes precedence over PATTERN and ZERO, and
* PATTERN takes precedence overy ZERO.
*
* RANDOM_AES_BLOCK_IS_PATTERN is to define a 32-bit PATTERN.
*/
#define RANDOM_AES_BLOCK_IS_RANDOM /* to randomize the header */
#undef RANDOM_AES_BLOCK_IS_PATTERN /* to patternize the header */
#undef RANDOM_AES_BLOCK_IS_ZERO /* to clear the header */
static u32 get_major_version(void)
{
u32 major_id;
struct apb_misc_gp_ctlr *gp =
(struct apb_misc_gp_ctlr *)NV_PA_APB_MISC_GP_BASE;
major_id = bf_readl(HIDREV_MAJORPREV, &gp->hidrev);
return major_id;
}
static int is_production_mode_fuse_set(struct fuse_regs *fuse)
{
return readl(&fuse->production_mode);
}
static int is_odm_production_mode_fuse_set(struct fuse_regs *fuse)
{
return readl(&fuse->security_mode);
}
static int is_failure_analysis_mode(struct fuse_regs *fuse)
{
return readl(&fuse->fa);
}
static int is_odm_production_mode(void)
{
struct fuse_regs *fuse = (struct fuse_regs *)NV_PA_FUSE_BASE;
if (!is_failure_analysis_mode(fuse) &&
is_odm_production_mode_fuse_set(fuse))
return 1;
else
return 0;
}
static int is_production_mode(void)
{
struct fuse_regs *fuse = (struct fuse_regs *)NV_PA_FUSE_BASE;
if (get_major_version() == 0)
return 1;
if (!is_failure_analysis_mode(fuse) &&
is_production_mode_fuse_set(fuse) &&
!is_odm_production_mode_fuse_set(fuse))
return 1;
else
return 0;
}
static enum fuse_operating_mode fuse_get_operation_mode(void)
{
u32 chip_id;
struct apb_misc_gp_ctlr *gp =
(struct apb_misc_gp_ctlr *)NV_PA_APB_MISC_GP_BASE;
chip_id = bf_readl(HIDREV_CHIPID, &gp->hidrev);
if (chip_id == CHIPID_TEGRA2) {
if (is_odm_production_mode()) {
printf("!! odm_production_mode is not supported !!\n");
return MODE_UNDEFINED;
} else
if (is_production_mode())
return MODE_PRODUCTION;
else
return MODE_UNDEFINED;
}
return MODE_UNDEFINED;
}
/* Currently, this routine returns a 32-bit all 0 seed. */
static u32 query_random_seed(void)
{
return 0;
}
static void determine_crypto_options(int *is_encrypted, int *is_signed,
int *use_zero_key)
{
switch (fuse_get_operation_mode()) {
case MODE_PRODUCTION:
*is_encrypted = 0;
*is_signed = 1;
*use_zero_key = 1;
break;
case MODE_UNDEFINED:
default:
*is_encrypted = 0;
*is_signed = 0;
*use_zero_key = 0;
break;
}
}
static int sign_wb_code(u32 start, u32 length, int use_zero_key)
{
int err;
u8 *source; /* Pointer to source */
u8 *hash;
/* Calculate AES block parameters. */
source = (u8 *)(start + offsetof(struct wb_header, random_aes_block));
length -= offsetof(struct wb_header, random_aes_block);
hash = (u8 *)(start + offsetof(struct wb_header, hash));
err = sign_data_block(source, length, hash);
return err;
}
int warmboot_prepare_code(u32 seg_address, u32 seg_length)
{
int err = 0;
u32 length; /* length of the signed/encrypt code */
struct wb_header *dst_header; /* Pointer to dest WB header */
int is_encrypted; /* Segment is encrypted */
int is_signed; /* Segment is signed */
int use_zero_key; /* Use key of all zeros */
/* Determine crypto options. */
determine_crypto_options(&is_encrypted, &is_signed, &use_zero_key);
/* Get the actual code limits. */
length = roundup(((u32)wb_end - (u32)wb_start), 16);
/*
* The region specified by seg_address must not be in IRAM and must be
* nonzero in length.
*/
if ((seg_length == 0) || (seg_address == 0)) {
err = -EFAULT;
goto fail;
}
/* Things must be 16-byte aligned. */
if ((seg_length & 0xF) || (seg_address & 0xF)) {
err = -EINVAL;
goto fail;
}
/* Will the code fit? (destination includes wb_header + wb code) */
if (seg_length < (length + sizeof(struct wb_header))) {
err = -EINVAL;
goto fail;
}
dst_header = (struct wb_header *)seg_address;
memset((char *)dst_header, 0, sizeof(struct wb_header));
/* Populate the random_aes_block as requested. */
{
u32 *aes_block = (u32 *)&(dst_header->random_aes_block);
u32 *end = (u32 *)(((u32)aes_block) +
sizeof(dst_header->random_aes_block));
do {
#if defined(RANDOM_AES_BLOCK_IS_RANDOM)
*aes_block++ = query_random_seed();
#elif defined(RANDOM_AES_BLOCK_IS_PATTERN)
*aes_block++ = RANDOM_AES_BLOCK_IS_PATTERN;
#elif defined(RANDOM_AES_BLOCK_IS_ZERO)
*aes_block++ = 0;
#else
printf("None of RANDOM_AES_BLOCK_IS_XXX is defined; ");
printf("Default to pattern 0.\n");
*aes_block++ = 0;
#endif
} while (aes_block < end);
}
/* Populate the header. */
dst_header->length_in_secure = length + sizeof(struct wb_header);
dst_header->length_secure = length + sizeof(struct wb_header);
dst_header->destination = AP20_WB_RUN_ADDRESS;
dst_header->entry_point = AP20_WB_RUN_ADDRESS;
dst_header->code_length = length;
if (is_encrypted) {
printf("!!!! Encryption is not supported !!!!\n");
dst_header->length_in_secure = 0;
err = -EACCES;
goto fail;
} else
/* copy the wb code directly following dst_header. */
memcpy((char *)(dst_header+1), (char *)wb_start, length);
if (is_signed)
err = sign_wb_code(seg_address, dst_header->length_in_secure,
use_zero_key);
fail:
if (err)
printf("WB code not copied to LP0 location! (error=%d)\n", err);
return err;
}
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