smm: Clear SMRAM when debugging
This makes it easier to spot unused RAM.
BUG=b:80539294
TEST=built and tested on grunt. Verified unused memory was set to 0xcdcdcdcd
Change-Id: I335eaf642bd8526f31819eaac95ce80c2df3c300
Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Reviewed-on: https://review.coreboot.org/27227
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>
diff --git a/src/cpu/x86/smm/smm_module_loader.c b/src/cpu/x86/smm/smm_module_loader.c
index 3d7952f..e92fa05 100644
--- a/src/cpu/x86/smm/smm_module_loader.c
+++ b/src/cpu/x86/smm/smm_module_loader.c
@@ -346,6 +346,10 @@
if (rmodule_parse(&_binary_smm_start, &smm_mod))
return -1;
+ /* Clear SMM region */
+ if (IS_ENABLED(CONFIG_DEBUG_SMI))
+ memset(smram, 0xcd, size);
+
total_stack_size = params->per_cpu_stack_size *
params->num_concurrent_stacks;