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/*
* This file is part of the libpayload project.
*
* Copyright (C) 2013 Google, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#define LIBPAYLOAD
#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 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;
else
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*)
*(uint32_t*)(0xfffffffc);
if (CBFS_HEADER_MAGIC != ntohl(header->magic)) {
#if IS_ENABLED(CONFIG_LP_ROM_SIZE)
printk(BIOS_ERR, "Invalid CBFS master header at %p\n", header);
media->context = (void*)CONFIG_LP_ROM_SIZE;
#else
return -1;
#endif
} else {
uint32_t romsize = ntohl(header->romsize);
media->context = (void*)romsize;
#if IS_ENABLED(CONFIG_LP_ROM_SIZE)
if (CONFIG_LP_ROM_SIZE != romsize)
printk(BIOS_INFO, "Warning: rom size unmatch (%d/%d)\n",
CONFIG_LP_ROM_SIZE, romsize);
#endif
}
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);
}
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