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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/firmware_storage.h>
#include <vboot/firmware_cache.h>
/* Import the header files from vboot_reference. */
#include <vboot_api.h>
#define PREFIX "load_firmware: "
/* Amount of bytes we read each time we call read() */
#define BLOCK_SIZE 512
VbError_t VbExHashFirmwareBody(VbCommonParams* cparams,
uint32_t firmware_index)
{
firmware_cache_t *cache = (firmware_cache_t *)cparams->caller_context;
firmware_storage_t *file = cache->file;
firmware_info_t *info;
int index;
uint8_t *buffer;
size_t leftover, n, got_n;
if (firmware_index != VB_SELECT_FIRMWARE_A &&
firmware_index != VB_SELECT_FIRMWARE_B) {
VbExDebug(PREFIX "Incorrect firmware index: %lu\n",
firmware_index);
return 1;
}
index = (firmware_index == VB_SELECT_FIRMWARE_A ? 0 : 1);
info = &cache->infos[index];
buffer = info->buffer;
if (file->seek(file->context, info->offset, SEEK_SET)
< 0) {
VbExDebug(PREFIX "seek to firmware data failed\n");
return 1;
}
/*
* This loop feeds firmware body into VbUpdateFirmwareBodyHash.
* Variable leftover keeps the remaining number of bytes.
*/
for (leftover = info->size; leftover > 0; leftover -= n, buffer += n) {
n = min(BLOCK_SIZE, leftover);
got_n = file->read(file->context, buffer, n);
if (got_n != n) {
VbExDebug(PREFIX "an error has occured "
"while reading firmware: %d\n", n);
return 1;
}
/*
* See vboot_reference/firmware/include/vboot_api.h for
* documentation of this function.
*/
VbUpdateFirmwareBodyHash(cparams, buffer, n);
}
return 0;
}
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