blob: ed2122cb4efd1fe9fa8e97e5c0bc541dc43ec546 [file] [log] [blame]
* This file is part of the coreboot project.
* Copyright (C) 2013 The Chromium OS Authors. All rights reserved.
* 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
* 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., 51 Franklin St, Fifth Floor, Boston,
* MA 02110-1301 USA
#include <cbfs.h>
#include <string.h>
# define printk(x...)
# define init_default_cbfs_media libpayload_init_default_cbfs_media
extern int libpayload_init_default_cbfs_media(struct cbfs_media *media);
# include <console/console.h>
// Implementation of memory-mapped ROM media source on X86.
static int x86_rom_open(struct cbfs_media *media) {
return 0;
static void *x86_rom_map(struct cbfs_media *media, size_t offset, size_t count) {
void *ptr;
// Some address (ex, pointer to master header) may be given in memory
// mapped location. To workaround that, we handle >0xf0000000 as real
// memory pointer.
if ((uint32_t)offset > (uint32_t)0xf0000000)
ptr = (void*)offset;
ptr = (void*)(0 - (uint32_t)media->context + offset);
return ptr;
static void *x86_rom_unmap(struct cbfs_media *media, const void *address) {
return NULL;
static size_t x86_rom_read(struct cbfs_media *media, void *dest, size_t offset,
size_t count) {
void *ptr = x86_rom_map(media, offset, count);
memcpy(dest, ptr, count);
x86_rom_unmap(media, ptr);
return count;
static int x86_rom_close(struct cbfs_media *media) {
return 0;
int init_x86rom_cbfs_media(struct cbfs_media *media);
int init_x86rom_cbfs_media(struct cbfs_media *media) {
// On X86, we always keep a reference of pointer to CBFS header in
// 0xfffffffc, and the pointer is still a memory-mapped address.
// Since the CBFS core always use ROM offset, we need to figure out
// header->romsize even before media is initialized.
struct cbfs_header *header = (struct cbfs_header*)
if (CBFS_HEADER_MAGIC != ntohl(header->magic)) {
#if defined(CONFIG_ROM_SIZE)
printk(BIOS_ERR, "Invalid CBFS master header at %p\n", header);
media->context = (void*)CONFIG_ROM_SIZE;
return -1;
} else {
uint32_t romsize = ntohl(header->romsize);
media->context = (void*)romsize;
#if defined(CONFIG_ROM_SIZE)
if (CONFIG_ROM_SIZE != romsize)
printk(BIOS_INFO, "Warning: rom size unmatch (%d/%d)\n",
CONFIG_ROM_SIZE, romsize);
media->open = x86_rom_open;
media->close = x86_rom_close;
media->map = x86_rom_map;
media->unmap = x86_rom_unmap;
media->read = x86_rom_read;
return 0;
int init_default_cbfs_media(struct cbfs_media *media) {
return init_x86rom_cbfs_media(media);