diff options
Diffstat (limited to 'src/soc/amd/common/block/cpu/smm')
| -rw-r--r-- | src/soc/amd/common/block/cpu/smm/Makefile.inc | 3 | ||||
| -rw-r--r-- | src/soc/amd/common/block/cpu/smm/smm_helper.c | 28 |
2 files changed, 31 insertions, 0 deletions
diff --git a/src/soc/amd/common/block/cpu/smm/Makefile.inc b/src/soc/amd/common/block/cpu/smm/Makefile.inc index df54d93389..3008868760 100644 --- a/src/soc/amd/common/block/cpu/smm/Makefile.inc +++ b/src/soc/amd/common/block/cpu/smm/Makefile.inc @@ -2,7 +2,10 @@ ifeq ($(CONFIG_SOC_AMD_COMMON_BLOCK_SMM),y) subdirs-y += ../../../../../../cpu/x86/smm +romstage-y += smm_helper.c +postcar-y += smm_helper.c ramstage-y += smm_relocate.c +ramstage-y += smm_helper.c smm-y += smi_handler.c endif # CONFIG_SOC_AMD_COMMON_BLOCK_SMM diff --git a/src/soc/amd/common/block/cpu/smm/smm_helper.c b/src/soc/amd/common/block/cpu/smm/smm_helper.c new file mode 100644 index 0000000000..bf01b8b965 --- /dev/null +++ b/src/soc/amd/common/block/cpu/smm/smm_helper.c @@ -0,0 +1,28 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#include <amdblocks/smm.h> +#include <console/console.h> +#include <cpu/x86/msr.h> +#include <cpu/amd/msr.h> + +/* + * For data stored in TSEG, ensure TValid is clear so R/W access can reach + * the DRAM when not in SMM. + */ +void clear_tvalid(void) +{ + msr_t hwcr = rdmsr(HWCR_MSR); + msr_t mask = rdmsr(SMM_MASK_MSR); + int tvalid = !!(mask.lo & SMM_TSEG_VALID); + + if (hwcr.lo & SMM_LOCK) { + if (!tvalid) /* not valid but locked means still accessible */ + return; + + printk(BIOS_ERR, "Error: can't clear TValid, already locked\n"); + return; + } + + mask.lo &= ~SMM_TSEG_VALID; + wrmsr(SMM_MASK_MSR, mask); +} |