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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>
This commit is contained in:
Raul E Rangel 2018-06-25 14:22:27 -06:00 committed by Martin Roth
parent c57a273d4c
commit dd549e1175
1 changed files with 4 additions and 0 deletions
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4
src/cpu/x86/smm/smm_module_loader.c
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@ -346,6 +346,10 @@ int smm_load_module(void *smram, size_t size, struct smm_loader_params *params)
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;