deb510afeb
Provide an optional, coreboot-managed CBMEM scratch buffer for SMM code. CBMEM is reserved from the OS via the memory map and persists across S3, so it is suitable for firmware-owned DMA buffers used during resume. SMRAM is not device DMA-accessible, so this scratch buffer must live outside SMRAM. Pass the base/size to SMM via smm_runtime so SMM code can validate placement and avoid relying on untrusted pointers. The CBMEM region size is configurable via SMM_OPAL_S3_SCRATCH_SIZE, defaulting to 16 KiB as a safe value. TEST=tested with rest of patch train Change-Id: I79ae5327f27e574b151b7cf456761fa0d7038f2f Signed-off-by: Sean Rhodes <sean@starlabs.systems> Reviewed-on: https://review.coreboot.org/c/coreboot/+/91042 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Patrick Rudolph <patrick.rudolph@9elements.com> |
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| amd | ||
| intel | ||
| power | ||
| x86 | ||
| cpu.h | ||