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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.
*/
#include <boot_device.h>
#include <cbfs.h>
#include <endian.h>
#include <stdlib.h>
/* The ROM is memory mapped just below 4GiB. Form a pointer for the base. */
#define rom_base ((void *)(uintptr_t)(0x100000000ULL-CONFIG_ROM_SIZE))
static const struct mem_region_device boot_dev =
MEM_REGION_DEV_RO_INIT(rom_base, CONFIG_ROM_SIZE);
const struct region_device *boot_device_ro(void)
{
return &boot_dev.rdev;
}
static int cbfs_master_header_props(struct cbfs_props *props)
{
struct cbfs_header header;
int32_t offset;
const struct region_device *bdev;
bdev = boot_device_ro();
rdev_readat(bdev, &offset, CONFIG_ROM_SIZE - sizeof(offset),
sizeof(offset));
/* The offset is relative to the end of the media. */
offset += CONFIG_ROM_SIZE;
rdev_readat(bdev, &header , offset, sizeof(header));
header.magic = ntohl(header.magic);
header.romsize = ntohl(header.romsize);
header.bootblocksize = ntohl(header.bootblocksize);
header.offset = ntohl(header.offset);
if (header.magic != CBFS_HEADER_MAGIC)
return -1;
props->offset = header.offset;
if (CONFIG_ROM_SIZE != header.romsize)
props->size = CONFIG_ROM_SIZE;
else
props->size = header.romsize;
props->size -= props->offset;
props->size -= header.bootblocksize;
props->size = ALIGN_DOWN(props->size, 64);
return 0;
}
const struct cbfs_locator cbfs_master_header_locator = {
.name = "Master Header Locator",
.locate = cbfs_master_header_props,
};
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