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soc/intel/apollolake: Implement stage cache to improve resume time

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This patch enables stage cache to save ~40ms during S3 resume.
It saves ramstage in the stage cache and restores it on resume
so that ramstage does not have to reinitialize during the
resume flow. Stage cache functionality is added to postcar stage
since ramstage is called from postcar.

BUG=chrome-os-partner:56941
BRANCH=none
TEST=built for Reef and tested ramstage being cached

Change-Id: I1551fd0faca536bd8c8656f0a8ec7f900aae1f72
Signed-off-by: Brandon Breitenstein <brandon.breitenstein@intel.com>
Reviewed-on: https://review.coreboot.org/16833
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
This commit is contained in:
Brandon Breitenstein
2016-09-30 13:57:12 -07:00
committed by Martin Roth
parent 9344bde4fe
commit 135eae91d5
8 changed files with 63 additions and 6 deletions
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8
src/soc/intel/apollolake/cpu.c
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@ -102,19 +102,23 @@ static void get_smm_info(uintptr_t *perm_smbase, size_t *perm_smsize,
{
void *smm_base;
size_t smm_size;
void *handler_base;
size_t handler_size;
/* All range registers are aligned to 4KiB */
const uint32_t rmask = ~((1 << 12) - 1);
/* Initialize global tracking state. */
smm_region(&smm_base, &smm_size);
smm_subregion(SMM_SUBREGION_HANDLER, &handler_base, &handler_size);
relo_attrs.smbase = (uint32_t)smm_base;
relo_attrs.smrr_base = relo_attrs.smbase | MTRR_TYPE_WRBACK;
relo_attrs.smrr_mask = ~(smm_size - 1) & rmask;
relo_attrs.smrr_mask |= MTRR_PHYS_MASK_VALID;
*perm_smbase = relo_attrs.smbase;
*perm_smsize = smm_size - CONFIG_SMM_RESERVED_SIZE;
*perm_smbase = (uintptr_t)handler_base;
*perm_smsize = handler_size;
*smm_save_state_size = sizeof(em64t100_smm_state_save_area_t);
}