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/*
* 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
* 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 <cbfs.h>
#include <string.h>
#ifdef LIBPAYLOAD
# define printk(x...)
# define init_default_cbfs_media libpayload_init_default_cbfs_media
extern int libpayload_init_default_cbfs_media(struct cbfs_media *media);
#else
# include <console/console.h>
#endif
// Implementation of memory-mapped ROM media source on X86.
static int rom_media_open(struct cbfs_media *media) {
return 0;
}
static void *rom_media_map(struct cbfs_media *media, size_t offset, size_t count) {
void *ptr;
printk(BIOS_INFO, "%s: media %p, offset %lx, size %ld.\n", __func__, media, offset, count);
ptr = (void*)offset;
return ptr;
}
static void *rom_media_unmap(struct cbfs_media *media, const void *address) {
return NULL;
}
static size_t rom_media_read(struct cbfs_media *media, void *dest, size_t offset,
size_t count) {
void *ptr = rom_media_map(media, offset, count);
memcpy(dest, ptr, count);
rom_media_unmap(media, ptr);
return count;
}
static int rom_media_close(struct cbfs_media *media) {
return 0;
}
static int init_rom_media_cbfs(struct cbfs_media *media) {
/* this assumes that the CBFS resides at 0x0,
* which is true for the default configuration
*/
int32_t *cbfs_header_ptr = (int32_t*)(uintptr_t)(CONFIG_CBFS_SIZE - 4);
uint64_t cbfs_header_offset = CONFIG_CBFS_SIZE + *cbfs_header_ptr;
struct cbfs_header *header = (struct cbfs_header*) cbfs_header_offset;
if (CBFS_HEADER_MAGIC != ntohl(header->magic)) {
printk(BIOS_ERR, "Invalid CBFS master header at %p\n", header);
printk(BIOS_ERR, "Expected %08lx and got %08lx\n", (unsigned long) CBFS_HEADER_MAGIC, (unsigned long) ntohl(header->magic));
return -1;
} else {
uint32_t romsize = ntohl(header->romsize);
media->context = (void*)(uintptr_t)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);
#endif
}
media->open = rom_media_open;
media->close = rom_media_close;
media->map = rom_media_map;
media->unmap = rom_media_unmap;
media->read = rom_media_read;
return 0;
}
int init_default_cbfs_media(struct cbfs_media *media) {
return init_rom_media_cbfs(media);
}
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