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BACKPORT: x86: provide infrastructure to backup default SMM region

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Certain CPUs require the default SMM region to be backed up
on resume after a suspend. The reason is that in order to
relocate the SMM region the default SMM region has to be used.
As coreboot is unaware of how that memory is used it needs to
be backed up. Therefore provide a common method for doing this.

BUG=chrome-os-partner:26563
BRANCH=baytrail
TEST=Confirmed SMM backup region in cbmem. Suspend and Resumed.

Change-Id: I65fe1317dc0b2203cb29118564fdba995770ffea
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/188716
Reviewed-by: Marc Jones <marc.jones@se-eng.com>
This commit is contained in:
Aaron Durbin 2014-02-13 10:26:18 -06:00 • committed by chrome-internal-fetch
commit e236bf0750
6 changed files with 82 additions and 0 deletions
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1
src/include/cbmem.h
View file

@ -74,6 +74,7 @@
#define CBMEM_ID_REFCODE_CACHE 0x4efc0de5
#define CBMEM_ID_POWER_STATE 0x50535454
#define CBMEM_ID_RAM_OOPS 0x05430095
#define CBMEM_ID_SMM_SAVE_SPACE 0x07e9acee
#define CBMEM_ID_NONE 0x00000000
#ifndef __ASSEMBLER__

4
src/include/cpu/x86/smm.h
View file

@ -571,4 +571,8 @@ int smm_load_module(void *smram, int size, struct smm_loader_params *params);
#endif /* __SMM__ */
#endif /* CONFIG_SMM_MODULES */
/* Backup and restore default SMM region. */
void *backup_default_smm_area(void);
void restore_default_smm_area(void *smm_save_area);
#endif