diff options
| -rw-r--r-- | UefiCpuPkg/UefiCpuPkg.dec | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/UefiCpuPkg/UefiCpuPkg.dec b/UefiCpuPkg/UefiCpuPkg.dec index 86ad61f64b..83acd33612 100644 --- a/UefiCpuPkg/UefiCpuPkg.dec +++ b/UefiCpuPkg/UefiCpuPkg.dec @@ -278,6 +278,18 @@ # @Prompt Current boot is a power-on reset.
gUefiCpuPkgTokenSpaceGuid.PcdIsPowerOnReset|FALSE|BOOLEAN|0x0000001B
+[PcdsFixedAtBuild.X64, PcdsPatchableInModule.X64, PcdsDynamic.X64, PcdsDynamicEx.X64]
+ ## Indicate access to non-SMRAM memory is restricted to reserved, runtime and ACPI NVS type after SmmReadyToLock.
+ # MMIO access is always allowed regardless of the value of this PCD.
+ # Loose of such restriction is only required by RAS components in X64 platforms.
+ # The PCD value is considered as constantly TRUE in IA32 platforms.
+ # When the PCD value is TRUE, page table is initialized to cover all memory spaces
+ # and the memory occupied by page table is protected by page table itself as read-only.
+ # TRUE - Access to non-SMRAM memory is restricted to reserved, runtime and ACPI NVS type after SmmReadyToLock.<BR>
+ # FALSE - Access to any type of non-SMRAM memory after SmmReadyToLock is allowed.<BR>
+ # @Prompt Access to non-SMRAM memory is restricted to reserved, runtime and ACPI NVS type after SmmReadyToLock.
+ gUefiCpuPkgTokenSpaceGuid.PcdCpuSmmRestrictedMemoryAccess|TRUE|BOOLEAN|0x3213210F
+
[PcdsDynamic, PcdsDynamicEx]
## Contains the pointer to a CPU S3 data buffer of structure ACPI_CPU_DATA.
# @Prompt The pointer to a CPU S3 data buffer.
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