diff options
| author | Subrata Banik <subratabanik@google.com> | 2022-08-15 15:16:43 +0530 |
|---|---|---|
| committer | Martin L Roth <gaumless@gmail.com> | 2022-08-21 14:58:21 +0000 |
| commit | 29a92e87ca4ed27d2c3397f6f81af50820f0c43f (patch) | |
| tree | 544ed6c1b4a62b7b480f0331bfbadb63a4cb7926 | |
| parent | 086a91c05c5426fd21c15c94ad008df9c7c01a20 (diff) | |
soc/intel/common/block/cpu: API to check if TME is supported
As per the Alder Lake FAS coreboot shall detect the existence of TME
feature by running the CPUID instruction:
CPUID leaf 7/sub-leaf 0
Return Value in ECX [bit 13]=1
If TME is supported then only access to TME MSRs are allowed otherwise
accessing those MSRs would result in GP#.
TEST=Able to detect the existence of TME feature across different
Alder Lake and Meteor Lake CPU SKUs.
Signed-off-by: Subrata Banik <subratabanik@google.com>
Change-Id: Ibd4fcf15a66d27748ac7fbb52b18d7264b901cd8
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66749
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tarun Tuli <taruntuli@google.com>
| -rw-r--r-- | src/soc/intel/common/block/cpu/cpulib.c | 9 | ||||
| -rw-r--r-- | src/soc/intel/common/block/include/intelblocks/cpulib.h | 8 | ||||
| -rw-r--r-- | src/soc/intel/common/block/include/intelblocks/msr.h | 1 |
3 files changed, 18 insertions, 0 deletions
diff --git a/src/soc/intel/common/block/cpu/cpulib.c b/src/soc/intel/common/block/cpu/cpulib.c index 0b91860dfd..9e4f7a27b0 100644 --- a/src/soc/intel/common/block/cpu/cpulib.c +++ b/src/soc/intel/common/block/cpu/cpulib.c @@ -501,3 +501,12 @@ void init_core_prmrr(void) if (msr.lo & MTRR_CAP_PRMRR) sync_core_prmrr(); } + +bool is_tme_supported(void) +{ + struct cpuid_result cpuid_regs; + + cpuid_regs = cpuid_ext(0x7, 0x0); /* ECX[13] is feature capability */ + + return (cpuid_regs.ecx & TME_SUPPORTED); +} diff --git a/src/soc/intel/common/block/include/intelblocks/cpulib.h b/src/soc/intel/common/block/include/intelblocks/cpulib.h index 0d489f4190..f0ebd09f82 100644 --- a/src/soc/intel/common/block/include/intelblocks/cpulib.h +++ b/src/soc/intel/common/block/include/intelblocks/cpulib.h @@ -194,4 +194,12 @@ void get_cpu_topology_from_apicid(uint32_t apicid, uint8_t *package, */ void init_core_prmrr(void); +/* + * Check if TME is supported by the CPU + * + * coreboot shall detect the existence of TME feature by running CPUID instruction: + * CPUID leaf 7/sub-leaf 0: Return Value in ECX [bit 13] = 1 + */ +bool is_tme_supported(void); + #endif /* SOC_INTEL_COMMON_BLOCK_CPULIB_H */ diff --git a/src/soc/intel/common/block/include/intelblocks/msr.h b/src/soc/intel/common/block/include/intelblocks/msr.h index 8e56aa325b..a7ad699733 100644 --- a/src/soc/intel/common/block/include/intelblocks/msr.h +++ b/src/soc/intel/common/block/include/intelblocks/msr.h @@ -106,5 +106,6 @@ #define SMRR_LOCK_SUPPORTED (1<<14) #define SGX_SUPPORTED (1<<2) +#define TME_SUPPORTED (1<<13) #endif /* SOC_INTEL_COMMON_MSR_H */ |