#define SMM_FEATURES_LIB_IA32_CORE_SMRR_PHYSMASK 0x0A1\r
#define EFI_MSR_SMRR_MASK 0xFFFFF000\r
#define EFI_MSR_SMRR_PHYS_MASK_VALID BIT11\r
+#define SMM_FEATURES_LIB_SMM_FEATURE_CONTROL 0x4E0\r
+\r
+//\r
+// MSRs required for configuration of SMM Code Access Check\r
+//\r
+#define SMM_FEATURES_LIB_IA32_MCA_CAP 0x17D\r
+#define SMM_CODE_ACCESS_CHK_BIT BIT58\r
\r
//\r
// Set default value to assume SMRR is not supported\r
//\r
BOOLEAN mSmrrSupported = FALSE;\r
\r
+//\r
+// Set default value to assume MSR_SMM_FEATURE_CONTROL is not supported\r
+//\r
+BOOLEAN mSmmFeatureControlSupported = FALSE;\r
+\r
//\r
// Set default value to assume IA-32 Architectural MSRs are used\r
//\r
{\r
SMRAM_SAVE_STATE_MAP *CpuState;\r
UINT64 FeatureControl;\r
+ UINT32 RegEax;\r
+ UINT32 RegEdx;\r
+ UINTN FamilyId;\r
+ UINTN ModelId;\r
\r
//\r
// Configure SMBASE.\r
AsmWriteMsr64 (mSmrrPhysMaskMsr, (~(CpuHotPlugData->SmrrSize - 1) & EFI_MSR_SMRR_MASK));\r
mSmrrEnabled[CpuIndex] = FALSE;\r
}\r
+\r
+ //\r
+ // Retrieve CPU Family and Model\r
+ //\r
+ AsmCpuid (CPUID_VERSION_INFO, &RegEax, NULL, NULL, &RegEdx);\r
+ FamilyId = (RegEax >> 8) & 0xf;\r
+ ModelId = (RegEax >> 4) & 0xf;\r
+ if (FamilyId == 0x06 || FamilyId == 0x0f) {\r
+ ModelId = ModelId | ((RegEax >> 12) & 0xf0);\r
+ }\r
+\r
+ //\r
+ // Intel(R) 64 and IA-32 Architectures Software Developer's Manual\r
+ // Volume 3C, Section 35.10.1 MSRs in 4th Generation Intel(R) Core(TM)\r
+ // Processor Family.\r
+ //\r
+ // If CPU Family/Model is 06_3C, 06_45, or 06_46 then use 4th Generation\r
+ // Intel(R) Core(TM) Processor Family MSRs.\r
+ //\r
+ if (FamilyId == 0x06) {\r
+ if (ModelId == 0x3C || ModelId == 0x45 || ModelId == 0x46) {\r
+ //\r
+ // Check to see if the CPU supports the SMM Code Access Check feature\r
+ // Do not access this MSR unless the CPU supports the SmmRegFeatureControl\r
+ //\r
+ if ((AsmReadMsr64 (SMM_FEATURES_LIB_IA32_MCA_CAP) & SMM_CODE_ACCESS_CHK_BIT) != 0) {\r
+ mSmmFeatureControlSupported = TRUE;\r
+ }\r
+ }\r
+ }\r
}\r
\r
/**\r
IN SMM_REG_NAME RegName\r
)\r
{\r
+ if (mSmmFeatureControlSupported && RegName == SmmRegFeatureControl) {\r
+ return TRUE;\r
+ }\r
return FALSE;\r
}\r
\r
IN SMM_REG_NAME RegName\r
)\r
{\r
+ if (mSmmFeatureControlSupported && RegName == SmmRegFeatureControl) {\r
+ return AsmReadMsr64 (SMM_FEATURES_LIB_SMM_FEATURE_CONTROL);\r
+ }\r
return 0;\r
}\r
\r
IN UINT64 Value\r
)\r
{\r
+ if (mSmmFeatureControlSupported && RegName == SmmRegFeatureControl) {\r
+ AsmWriteMsr64 (SMM_FEATURES_LIB_SMM_FEATURE_CONTROL, Value);\r
+ }\r
}\r
\r
/**\r