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coreboot: config to cache ramstage outside CBMEM

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Haswell was the original chipset to store the cache
in another area besides CBMEM. However, it was specific
to the implementation. Instead, provide a generic way
to obtain the location of the ramstage cache. This option
is selected using the CACHE_RELOCATED_RAMSTAGE_OUTSIDE_CBMEM
Kconfig option.

BUG=chrome-os-partner:23249
BRANCH=None
TEST=Built and booted with baytrail support. Also built for
     falco successfully.

Change-Id: I70d0940f7a8f73640c92a75fd22588c2c234241b
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/172602
Reviewed-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/4876
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
This commit is contained in:
Aaron Durbin
2013-10-10 20:37:04 -05:00
committed by Aaron Durbin
parent 6ac3405fdf
commit 75e297428f
7 changed files with 213 additions and 119 deletions
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49
src/include/ramstage_cache.h Normal file
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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_
#if !defined(__PRE_RAM__)
#error "ramstage_cache only used in romstage for loading ramstage."
#endif
/* 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);
#endif /* _RAMSTAGE_CACHE_ */