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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 <chromeos/common.h>
#include <chromeos/hasher_state.h>
#include <vboot_api.h>
#include <vboot_struct.h>
#define PREFIX "load_firmware: "
/* This can only be called after key block has been verified */
static uintptr_t firmware_body_size(const uintptr_t vblock_address)
{
const VbKeyBlockHeader const *keyblock;
const VbFirmwarePreambleHeader const *preamble;
keyblock = (VbKeyBlockHeader *)vblock_address;
preamble = (VbFirmwarePreambleHeader *)
(vblock_address + (uintptr_t)keyblock->key_block_size);
return preamble->body_signature.data_size;
}
VbError_t VbExHashFirmwareBody(VbCommonParams* cparams, uint32_t firmware_index)
{
hasher_state_t *s = cparams->caller_context;
const int i = (firmware_index == VB_SELECT_FIRMWARE_A ? 0 : 1);
firmware_storage_t *file = s->file;
if (firmware_index != VB_SELECT_FIRMWARE_A &&
firmware_index != VB_SELECT_FIRMWARE_B) {
VBDEBUG(PREFIX "incorrect firmware index: %d\n",
firmware_index);
return 1;
}
/*
* The key block has been verified. It is safe now to infer the actual
* firmware body size from the key block.
*/
s->fw[i].size = firmware_body_size((uintptr_t)s->fw[i].vblock);
if (file->read(file, s->fw[i].offset, s->fw[i].size, s->fw[i].cache)) {
VBDEBUG(PREFIX "fail to read firmware: %d\n", firmware_index);
return 1;
}
VbUpdateFirmwareBodyHash(cparams, s->fw[i].cache, s->fw[i].size);
return 0;
}
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