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/*
* This file is part of the coreboot project.
*
* Copyright 2015 Google Inc.
*
* 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 of the License.
*
* 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.
*/
#include <boot_device.h>
#include <cbfs.h>
#include <console/console.h>
#include <endian.h>
#include <commonlib/region.h>
/* This function is marked as weak to allow a particular platform to
* override the logic. This implementation should work for most devices. */
int __attribute__((weak)) cbfs_boot_region_properties(struct cbfs_props *props)
{
struct cbfs_header header;
const struct region_device *bdev;
int32_t rel_offset;
size_t offset;
bdev = boot_device_ro();
if (bdev == NULL)
return -1;
/* Find location of header using signed 32-bit offset from
* end of CBFS region. */
offset = CONFIG_CBFS_SIZE - sizeof(int32_t);
if (rdev_readat(bdev, &rel_offset, offset, sizeof(int32_t)) < 0)
return -1;
offset = CONFIG_CBFS_SIZE + rel_offset;
if (rdev_readat(bdev, &header, offset, sizeof(header)) < 0)
return -1;
header.magic = ntohl(header.magic);
header.romsize = ntohl(header.romsize);
header.offset = ntohl(header.offset);
if (header.magic != CBFS_HEADER_MAGIC)
return -1;
props->offset = header.offset;
props->size = header.romsize;
props->size -= props->offset;
printk(BIOS_SPEW, "CBFS @ %zx size %zx\n", props->offset, props->size);
return 0;
}
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