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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2012 The ChromiumOS 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.
*/
#include <stdint.h>
#include <stddef.h>
#include <string.h>
#include <console/console.h>
#include <cbfs.h>
#include "fmap.h"
static int is_fmap_signature_valid(const struct fmap *fmap)
{
const char reversed_sig[] = FMAP_REVERSED_SIGNATURE;
const char *p2 = reversed_sig + sizeof(FMAP_REVERSED_SIGNATURE) - 2;
const char *p1 = (char *)fmap;
while (p2 >= reversed_sig)
if (*p1++ != *p2--) {
printk(BIOS_ERR, "No FMAP found at %p.\n", fmap);
return 1;
}
printk(BIOS_DEBUG, "FMAP: Found \"%s\" version %d.%d at %p.\n",
fmap->name, fmap->ver_major, fmap->ver_minor, fmap);
printk(BIOS_DEBUG, "FMAP: base = %llx size = %x #areas = %d\n",
(unsigned long long)fmap->base, fmap->size, fmap->nareas);
return 0;
}
/* Find FMAP data structure in ROM.
* See http://code.google.com/p/flashmap/ for more information on FMAP.
*/
const struct fmap *fmap_find(void)
{
/* FIXME: Get rid of the hard codes. The "easy" way would be to
* do a binary search, but since ROM accesses are slow, we don't
* want to spend a lot of time looking for the FMAP. An elegant
* solution would be to store a pointer to the FMAP in the CBFS
* master header; that would require some more changes to cbfstool
* and possibly cros_bundle_firmware.
*/
const struct fmap *fmap;
struct cbfs_media media;
size_t size;
if (init_default_cbfs_media(&media)) {
printk(BIOS_ERR, "failed to init default cbfs media\n");
return NULL;
}
media.open(&media);
fmap = media.map(&media, CONFIG_FLASHMAP_OFFSET, sizeof(*fmap));
if (fmap == CBFS_MEDIA_INVALID_MAP_ADDRESS) {
printk(BIOS_ERR, "failed to map FMAP header\n");
media.close(&media);
return NULL;
}
if (is_fmap_signature_valid(fmap)) {
media.unmap(&media, fmap);
media.close(&media);
return NULL;
}
size = sizeof(*fmap) + sizeof(struct fmap_area) * fmap->nareas;
media.unmap(&media, fmap);
fmap = media.map(&media, CONFIG_FLASHMAP_OFFSET, size);
if (fmap == CBFS_MEDIA_INVALID_MAP_ADDRESS) {
printk(BIOS_ERR, "failed to map FMAP (size=%zu)\n", size);
media.unmap(&media, fmap);
media.close(&media);
return NULL;
}
media.close(&media);
return fmap;
}
const struct fmap_area *find_fmap_area(const struct fmap *fmap,
const char name[])
{
const struct fmap_area *area = NULL;
if (fmap) {
int i;
for (i = 0; i < fmap->nareas; i++) {
if (!strcmp((const char *)fmap->areas[i].name, name)) {
area = &fmap->areas[i];
break;
}
}
}
if (area) {
printk(BIOS_DEBUG, "FMAP: area %s found\n", name);
printk(BIOS_DEBUG, "FMAP: offset: %x\n", area->offset);
printk(BIOS_DEBUG, "FMAP: size: %d bytes\n", area->size);
} else {
printk(BIOS_DEBUG, "FMAP: area %s not found\n", name);
}
return area;
}
int find_fmap_entry(const char name[], void **pointer)
{
MAYBE_STATIC const struct fmap *fmap = NULL;
const struct fmap_area *area;
void *base = NULL;
if (!fmap)
fmap = fmap_find();
area = find_fmap_area(fmap, name);
if (!area)
return -1;
/* Right now cros_bundle_firmware does not write a valid
* base address into the FMAP. Hence, if base is 0, assume
* 4GB-8MB as base address.
*/
if (fmap->base) {
base = (void *)(unsigned long)fmap->base;
printk(BIOS_DEBUG, "FMAP: %s base at %p\n", name, base);
} else {
#if CONFIG_ARCH_X86
base = (void *)(0 - CONFIG_ROM_SIZE);
printk(BIOS_WARNING, "FMAP: No valid base address, using"
" 0x%p\n", base);
#endif
}
*pointer = (void*) ((uintptr_t)base + area->offset);
printk(BIOS_DEBUG, "FMAP: %s at %p (offset %x)\n",
name, *pointer, area->offset);
return area->size;
}
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