diff options
| author | Eugene Myers <cedarhouse@comcast.net> | 2022-02-07 16:45:22 -0500 |
|---|---|---|
| committer | Felix Held <felix-coreboot@felixheld.de> | 2022-02-24 00:27:37 +0000 |
| commit | b2c681fc4a1d852f5b436660e7d3a967cf5e7333 (patch) | |
| tree | e806f2c5386b63833fcd548b1549c2d84392dd50 /src/security/intel/stm | |
| parent | a514192ffee49266568ce1f2bb3cbbebf05c36b8 (diff) | |
security/intel/stm: Make STM setup MP safe
Some processor families allow for SMM setup to be done in parallel.
On processors that have this feature, the BIOS resource list becomes
unusable for some processors during STM startup.
This patch covers two cases: (1) The BIOS resource list becomes twice
as long because the smm_relocation function is called twice - this is
resolved by recreating the list on each invocation. (2) Not all
processors receive the correct resource list pointer - this is resolved
by having every processor execute the pointer calculation code, which is
a lot faster then forcing all processors to spin lock waiting for this
value to be calculated.
This patch has been tested on a Purism L1UM-1X8C and Purism 15v4.
Signed-off-by: Eugene Myers <cedarhouse@comcast.net>
Change-Id: I7619038edc78f306bd7eb95844bd1598766f8b37
Reviewed-on: https://review.coreboot.org/c/coreboot/+/61689
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eugene Myers <cedarhouse1@comcast.net>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
Diffstat (limited to 'src/security/intel/stm')
| -rw-r--r-- | src/security/intel/stm/StmPlatformResource.c | 5 | ||||
| -rw-r--r-- | src/security/intel/stm/StmPlatformSmm.c | 9 |
2 files changed, 11 insertions, 3 deletions
diff --git a/src/security/intel/stm/StmPlatformResource.c b/src/security/intel/stm/StmPlatformResource.c index 75d52a26cf..4e56e2e574 100644 --- a/src/security/intel/stm/StmPlatformResource.c +++ b/src/security/intel/stm/StmPlatformResource.c @@ -167,9 +167,14 @@ static void add_msr_resources(void) /* * Add resources to BIOS resource database. */ + +extern uint8_t *m_stm_resources_ptr; + void add_resources_cmd(void) { + m_stm_resources_ptr = NULL; + add_simple_resources(); add_msr_resources(); diff --git a/src/security/intel/stm/StmPlatformSmm.c b/src/security/intel/stm/StmPlatformSmm.c index ef02ae3971..bcf935cb11 100644 --- a/src/security/intel/stm/StmPlatformSmm.c +++ b/src/security/intel/stm/StmPlatformSmm.c @@ -155,12 +155,15 @@ void stm_setup(uintptr_t mseg, int cpu, uintptr_t smbase, return; } + // This code moved here because paralled SMM set can cause + // some processor to receive a bad value + // calculate the location in SMRAM + addr_calc = mseg - CONFIG_BIOS_RESOURCE_LIST_SIZE; + stm_resource_heap = (uint8_t *) addr_calc; + if (cpu == 0) { // need to create the BIOS resource list once - // first calculate the location in SMRAM - addr_calc = mseg - CONFIG_BIOS_RESOURCE_LIST_SIZE; - stm_resource_heap = (uint8_t *) addr_calc; printk(BIOS_DEBUG, "STM: stm_resource_heap located at %p\n", stm_resource_heap); //setup the list |