+[PcdsFixedAtBuild.X64, PcdsPatchableInModule.X64, PcdsDynamic.X64, PcdsDynamicEx.X64]\r
+ ## Indicate access to non-SMRAM memory is restricted to reserved, runtime and ACPI NVS type after SmmReadyToLock.\r
+ # MMIO access is always allowed regardless of the value of this PCD.\r
+ # Loose of such restriction is only required by RAS components in X64 platforms.\r
+ # The PCD value is considered as constantly TRUE in IA32 platforms.\r
+ # When the PCD value is TRUE, page table is initialized to cover all memory spaces\r
+ # and the memory occupied by page table is protected by page table itself as read-only.\r
+ # In X64 build, it cannot be enabled at the same time with SMM profile feature (PcdCpuSmmProfileEnable).\r
+ # In X64 build, it could not be enabled also at the same time with heap guard feature for SMM\r
+ # (PcdHeapGuardPropertyMask in MdeModulePkg).\r
+ # In IA32 build, page table memory is not marked as read-only when either SMM profile feature (PcdCpuSmmProfileEnable)\r
+ # or heap guard feature for SMM (PcdHeapGuardPropertyMask in MdeModulePkg) is enabled.\r
+ # TRUE - Access to non-SMRAM memory is restricted to reserved, runtime and ACPI NVS type after SmmReadyToLock.<BR>\r
+ # FALSE - Access to any type of non-SMRAM memory after SmmReadyToLock is allowed.<BR>\r
+ # @Prompt Access to non-SMRAM memory is restricted to reserved, runtime and ACPI NVS type after SmmReadyToLock.\r
+ gUefiCpuPkgTokenSpaceGuid.PcdCpuSmmRestrictedMemoryAccess|TRUE|BOOLEAN|0x3213210F\r
+\r