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smmstore: Add option to clear store on CMOS reset

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Change-Id: I78e63c0a4c6b5c9c18a1e0016409c61201b2b941
This commit is contained in:
Tim Crawford
2020-12-10 17:47:49 -07:00
committed by Jeremy Soller
parent f5a012e482
commit 81c36a2ca3
1 changed files with 27 additions and 0 deletions
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27
src/drivers/smmstore/store.c
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@ -8,6 +8,8 @@
#include <console/console.h> #include <console/console.h>
#include <smmstore.h> #include <smmstore.h>
#include <types.h> #include <types.h>
#include <bootstate.h>
#include <option.h>
/* /*
* The region format is still not finalized, but so far it looks like this: * The region format is still not finalized, but so far it looks like this:
@ -262,3 +264,28 @@ int smmstore_clear_region(void)
return 0; return 0;
} }
static void clear_store_on_reset(void *unused)
{
int preserve = 1;
int ret;
ret = get_option(&preserve, "preserve_smmstore");
if (ret != CB_SUCCESS) {
/*
* If the RTC cleared the CMOS earlier we will get an invalid
* checksum error.
*/
preserve = ret != CB_CMOS_CHECKSUM_INVALID;
}
if (!preserve) {
printk(BIOS_DEBUG, "SMMSTORE: CMOS reset, clearing store\n");
if (smmstore_clear_region() == 0) {
preserve = 1;
set_option("preserve_smmstore", &preserve);
}
}
}
BOOT_STATE_INIT_ENTRY(BS_PAYLOAD_LOAD, BS_ON_EXIT, clear_store_on_reset, NULL);