c43d417039
The stage_cache_external_region() calculation is actually dependennt on the properties of the chipset. The reason is that certain regions within the SMRAM are used for chipset-specific features. Therefore, provide an API for abstracting the querying of subregions within the SMRAM. The 3 subregions introduced are: SMM_SUBREGION_HANDLER - SMM handler area SMM_SUBREGION_CACHE - SMM cache region SMM_SUBREGION_CHIPSET - Chipset specific area. The subregions can be queried using the newly added smm_subregion() function. Now stage_cache_external_region() uses smm_subregion() to query the external stage cache in SMRAM, and this patch also eliminates 2 separate implementations of stage_cache_external_region() between romstage and ramstage. BUG=chrome-os-partner:43636 BRANCH=None TEST=Built, booted, suspended, resumed on glados. Original-Change-Id: Id669326ba9647117193aa604038b38b364ff0f82 Original-Signed-off-by: Aaron Durbin <adurbin@chromium.org> Original-Reviewed-on: https://chromium-review.googlesource.com/290833 Original-Reviewed-by: Leroy P Leahy <leroy.p.leahy@intel.com> Original-Reviewed-by: Duncan Laurie <dlaurie@chromium.org> Change-Id: Idb1a75d93c9b87053a7dedb82e85afc7df6334e0 Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: http://review.coreboot.org/11197 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi <pgeorgi@google.com>
51 lines
1.5 KiB
C
51 lines
1.5 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2015 Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc.
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*/
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#ifndef _COMMON_MEMMAP_H_
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#define _COMMON_MEMMAP_H_
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#include <types.h>
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/*
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* mmap_region_granluarity must to return a size which is a positive non-zero
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* integer multiple of the SMM size when SMM is in use. When not using SMM,
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* this value should be set to 8 MiB.
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*/
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size_t mmap_region_granluarity(void);
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/* Fills in the arguments for the entire SMM region covered by chipset
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* protections. e.g. TSEG. */
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void smm_region(void **start, size_t *size);
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enum {
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/* SMM handler area. */
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SMM_SUBREGION_HANDLER,
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/* SMM cache region. */
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SMM_SUBREGION_CACHE,
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/* Chipset specific area. */
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SMM_SUBREGION_CHIPSET,
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/* Total sub regions supported. */
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SMM_SUBREGION_NUM,
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};
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/* Fills in the start and size for the requested SMM subregion. Returns
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* 0 on susccess, < 0 on failure. */
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int smm_subregion(int sub, void **start, size_t *size);
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#endif /* _COMMON_MEMMAP_H_ */
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