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drivers/smmstore: Expose region device 

Allow other drivers to use the SMMSTORE region device.

Change-Id: I6316b703829590bd6f41c3d4013b4a4660b9cbab
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62014
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>
This commit is contained in:
Patrick Rudolph 2022-02-16 07:51:36 +01:00 committed by Lean Sheng Tan
parent 21975e4a49
commit 4e00f15592
3 changed files with 27 additions and 1 deletions
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2
src/drivers/smmstore/Makefile.inc
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@ -1,4 +1,4 @@
ramstage-$(CONFIG_SMMSTORE) += store.c
all-$(CONFIG_SMMSTORE) += store.c
ifeq ($(CONFIG_SMMSTORE),y)
$(call src-to-obj,ramstage,$(dir)/store.c) : $(obj)/fmap_config.h

24
src/drivers/smmstore/store.c
View File

@ -88,6 +88,30 @@ static int lookup_store(struct region_device *rstore)
return rdev_chain(rstore, rdev, 0, region_device_sz(rdev));
}
/* this function is non reentrant */
int smmstore_lookup_region(struct region_device *rstore)
{
static int done;
static int ret;
static struct region_device rdev;
if (!done) {
done = 1;
if (fmap_locate_area_as_rdev_rw(SMMSTORE_REGION, &rdev)) {
printk(BIOS_WARNING,
"smm store: Unable to find SMM store FMAP region '%s'\n",
SMMSTORE_REGION);
ret = -1;
} else {
ret = 0;
}
}
*rstore = rdev;
return ret;
}
/*
* Read entire store into user provided buffer
*

2
src/include/smmstore.h
View File

@ -115,6 +115,8 @@ int smmstore_rawclear_region(uint32_t block_id);
#if ENV_RAMSTAGE
int smmstore_get_info(struct smmstore_params_info *info);
#endif
struct region_device;
int smmstore_lookup_region(struct region_device *rstore);
/* Advertise SMMSTORE v2 support */
struct lb_header;