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/*
* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*/
#include <common.h>
#include <malloc.h>
#include <chromeos/get_firmware_body.h>
#include <chromeos/load_firmware_helper.h>
#include <gbb_header.h>
#include <load_firmware_fw.h>
#include <vboot_nvstorage.h>
#include <vboot_struct.h>
#define PREFIX "load_gbb: "
#define EMSG_INIT_FIRMWARE_STORAGE \
PREFIX "error: initialize_firmware_storage() fail\n"
#define EMSG_MALLOC \
PREFIX "error: malloc(%d) fail\n"
#define EMSG_READ_GBB \
PREFIX "error: read gbb fail\n"
#define EMSG_RELEASE_FIRMWARE_STORAGE \
PREFIX "error: release_firmware_storage() fail\n"
int load_gbb(firmware_storage_t *file, void **gbb_data_ptr,
uint64_t *gbb_size_ptr)
{
int retcode = -1;
void *gbb_data;
uint64_t gbb_size;
gbb_data = malloc(CONFIG_LENGTH_GBB);
gbb_size = CONFIG_LENGTH_GBB;
if (!gbb_data) {
debug(EMSG_MALLOC, CONFIG_LENGTH_GBB);
goto EXIT;
}
if (firmware_storage_read(file, CONFIG_OFFSET_GBB, gbb_size, gbb_data))
debug(EMSG_READ_GBB);
else
retcode = 0;
EXIT:
if (!retcode) {
*gbb_data_ptr = gbb_data;
*gbb_size_ptr = gbb_size;
} else
free(gbb_data);
return retcode;
}
#undef PREFIX
#define PREFIX "read_verification_block: "
/*
* Read verification block on <vblock_offset> from <file>.
*
* The pointer to verification block is stored in <vblock_ptr>, and the size of
* the block is stored in <vblock_size_ptr>.
*
* On success, the space for storing verification block is malloc()'ed, and has
* to be free()'ed by the caller.
*
* Return 0 if success, non-zero if fail.
*/
static int read_verification_block(firmware_storage_t *file,
const off_t vblock_offset,
void **vblock_ptr, uint64_t *vblock_size_ptr)
{
VbKeyBlockHeader kbh;
VbFirmwarePreambleHeader fph;
uint64_t key_block_size, vblock_size;
void *vblock;
/* read key block header */
if (firmware_storage_read(file, vblock_offset, sizeof(kbh), &kbh)) {
debug(PREFIX "read key block fail\n");
return -1;
}
key_block_size = kbh.key_block_size;
/* read firmware preamble header */
if (firmware_storage_read(file, vblock_offset + key_block_size,
sizeof(fph), &fph)) {
debug(PREFIX "read preamble fail\n");
return -1;
}
vblock_size = key_block_size + fph.preamble_size;
vblock = malloc(vblock_size);
if (!vblock) {
debug(PREFIX "malloc verification block fail\n");
return -1;
}
if (firmware_storage_read(file, vblock_offset, vblock_size, vblock)) {
debug(PREFIX "read verification block %d fail\n");
free(vblock);
return -1;
}
*vblock_ptr = vblock;
*vblock_size_ptr = vblock_size;
return 0;
}
#undef PREFIX
#define PREFIX "load_firmware_wrapper: "
int load_firmware_wrapper(firmware_storage_t *file,
const int primary_firmware,
const uint64_t boot_flags,
VbNvContext *nvcxt,
void *shared_data_blob,
uint8_t **firmware_data_ptr)
{
/*
* Offsets of verification blocks are
* vblock_offset[primary_firmware][verification_block_index].
*
* Offsets of firmware data are
* data_offset[primary_firmware][firmware_data_index].
*/
const off_t vblock_offset[2][2] = {
{ CONFIG_OFFSET_VBLOCK_A, CONFIG_OFFSET_VBLOCK_B },
{ CONFIG_OFFSET_VBLOCK_B, CONFIG_OFFSET_VBLOCK_A },
};
const off_t data_offset[2][2] = {
{ CONFIG_OFFSET_FW_MAIN_A, CONFIG_OFFSET_FW_MAIN_B },
{ CONFIG_OFFSET_FW_MAIN_B, CONFIG_OFFSET_FW_MAIN_A },
};
int status = LOAD_FIRMWARE_RECOVERY;
LoadFirmwareParams params;
get_firmware_body_internal_t gfbi;
memset(¶ms, '\0', sizeof(params));
get_firmware_body_internal_setup(&gfbi, file,
data_offset[primary_firmware][0],
data_offset[primary_firmware][1]);
if (load_gbb(file, ¶ms.gbb_data, ¶ms.gbb_size)) {
debug(PREFIX "error: read gbb fail\n");
goto EXIT;
}
if (read_verification_block(file, vblock_offset[primary_firmware][0],
¶ms.verification_block_0,
¶ms.verification_size_0)) {
debug(PREFIX "error: read verification block 0 fail\n");
goto EXIT;
}
if (read_verification_block(file, vblock_offset[primary_firmware][1],
¶ms.verification_block_1,
¶ms.verification_size_1)) {
debug(PREFIX "read verification block 1 fail\n");
goto EXIT;
}
params.nv_context = nvcxt;
params.boot_flags = boot_flags;
params.shared_data_blob = shared_data_blob ? shared_data_blob :
(uint8_t*) CONFIG_VB_SHARED_DATA_BLOB;
params.shared_data_size = VB_SHARED_DATA_REC_SIZE;
params.caller_internal = &gfbi;
status = LoadFirmware(¶ms);
if (status == LOAD_FIRMWARE_SUCCESS) {
debug(PREFIX "will jump to rewritable firmware %lld\n",
params.firmware_index);
*firmware_data_ptr = gfbi.firmware_body[params.firmware_index];
/* set to null so that *firmware_data_ptr is not disposed */
gfbi.firmware_body[params.firmware_index] = NULL;
}
EXIT:
get_firmware_body_internal_dispose(&gfbi);
free(params.gbb_data);
free(params.verification_block_0);
free(params.verification_block_1);
return status;
}
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