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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2013 Google Inc.
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _RAMSTAGE_CACHE_
#define _RAMSTAGE_CACHE_
#include <stddef.h>
#include <stdint.h>
/* This structure is saved along with the relocated ramstage program when
* CONFIG_RELOCATED_RAMSTAGE is employed. For x86, it can used to protect
* the integrity of the ramstage program on S3 resume by saving a copy of
* the relocated ramstage in SMM space with the assumption that the SMM region
* cannot be altered from the OS. The magic value just serves as a quick sanity
* check. */
#define RAMSTAGE_CACHE_MAGIC 0xf3c3a02a
struct ramstage_cache {
uint32_t magic;
uint32_t entry_point;
uint32_t load_address;
uint32_t size;
char program[0];
} __attribute__((packed));
/* Chipset/Board function for obtaining cache location and size. */
struct ramstage_cache *ramstage_cache_location(long *size);
/* Chipset/Board function called when cache is invalid on resume. */
void ramstage_cache_invalid(struct ramstage_cache *cache);
static inline int ramstage_cache_is_valid(const struct ramstage_cache *c)
{
return (c != NULL && c->magic == RAMSTAGE_CACHE_MAGIC);
}
#endif /* _RAMSTAGE_CACHE_ */
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