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/*
*
* Copyright (C) 2015 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.
*/
#include <libpayload-config.h>
#include <libpayload.h>
#include <commonlib/bsd/fmap_serialized.h>
#include <coreboot_tables.h>
#include <cbfs.h>
#include <boot_device.h>
#include <stdint.h>
#include <arch/virtual.h>
/* Private fmap cache. */
static struct fmap *_fmap_cache;
static enum cb_err fmap_find_area(struct fmap *fmap, const char *name, size_t *offset,
size_t *size)
{
for (size_t i = 0; i < le32toh(fmap->nareas); ++i) {
if (strncmp((const char *)fmap->areas[i].name, name, FMAP_STRLEN) != 0)
continue;
if (offset)
*offset = le32toh(fmap->areas[i].offset);
if (size)
*size = le32toh(fmap->areas[i].size);
return CB_SUCCESS;
}
return CB_ERR;
}
static bool fmap_is_signature_valid(struct fmap *fmap)
{
return memcmp(fmap->signature, FMAP_SIGNATURE, sizeof(fmap->signature)) == 0;
}
static bool fmap_setup_cache(void)
{
/* Use FMAP cache if available */
if (lib_sysinfo.fmap_cache
&& fmap_is_signature_valid((struct fmap *)phys_to_virt(lib_sysinfo.fmap_cache))) {
_fmap_cache = (struct fmap *)phys_to_virt(lib_sysinfo.fmap_cache);
return true;
}
return false;
}
enum cb_err fmap_locate_area(const char *name, size_t *offset, size_t *size)
{
if (!_fmap_cache && !fmap_setup_cache())
return CB_ERR;
return fmap_find_area(_fmap_cache, name, offset, size);
}
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