diff options
Diffstat (limited to 'src/cpu/intel/common')
| -rw-r--r-- | src/cpu/intel/common/Makefile.inc | 1 | ||||
| -rw-r--r-- | src/cpu/intel/common/common.h | 8 | ||||
| -rw-r--r-- | src/cpu/intel/common/common_init.c | 11 |
3 files changed, 20 insertions, 0 deletions
diff --git a/src/cpu/intel/common/Makefile.inc b/src/cpu/intel/common/Makefile.inc index de56a3a1e6..c4ac57ebcf 100644 --- a/src/cpu/intel/common/Makefile.inc +++ b/src/cpu/intel/common/Makefile.inc @@ -1,5 +1,6 @@ ## SPDX-License-Identifier: GPL-2.0-only +romstage-$(CONFIG_CPU_INTEL_COMMON) += common_init.c ramstage-$(CONFIG_CPU_INTEL_COMMON) += common_init.c ramstage-$(CONFIG_CPU_INTEL_COMMON) += hyperthreading.c ramstage-$(CONFIG_CPU_INTEL_COMMON_VOLTAGE) += voltage.c diff --git a/src/cpu/intel/common/common.h b/src/cpu/intel/common/common.h index a29fd2e6b6..d28d95c5c8 100644 --- a/src/cpu/intel/common/common.h +++ b/src/cpu/intel/common/common.h @@ -66,4 +66,12 @@ void set_energy_perf_pref(u8 pref); */ void enable_energy_perf_pref(void); +/* + * Check if Total Memory Encryption (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 diff --git a/src/cpu/intel/common/common_init.c b/src/cpu/intel/common/common_init.c index b24f742476..f8608ae029 100644 --- a/src/cpu/intel/common/common_init.c +++ b/src/cpu/intel/common/common_init.c @@ -14,6 +14,9 @@ #define CPUID_6_ENGERY_PERF_PREF (1 << 10) #define CPUID_6_HWP (1 << 7) +/* Structured Extended Feature Flags */ +#define CPUID_EXT_FEATURE_TME_SUPPORTED (1 << 13) + void set_vmx_and_lock(void) { set_feature_ctrl_vmx(); @@ -227,3 +230,11 @@ void set_energy_perf_pref(u8 pref) msr_unset_and_set(IA32_HWP_REQUEST, IA32_HWP_REQUEST_EPP_MASK, (uint64_t)pref << IA32_HWP_REQUEST_EPP_SHIFT); } + +bool is_tme_supported(void) +{ + struct cpuid_result cpuid_regs; + + cpuid_regs = cpuid_ext(CPUID_STRUCT_EXTENDED_FEATURE_FLAGS, 0x0); + return (cpuid_regs.ecx & CPUID_EXT_FEATURE_TME_SUPPORTED); +} |