3 files changed, 39 insertions, 1 deletions
diff --git a/MdeModulePkg/Include/Pi/PrePiDxeCis.h b/MdeModulePkg/Include/Pi/PrePiDxeCis.h
new file mode 100644
index 0000000..113ac37
--- /dev/null
+++ b/MdeModulePkg/Include/Pi/PrePiDxeCis.h
@@ -0,0 +1,25 @@
+/** @file
+  Include file matches things in PI.
+
+Copyright (c) 2022, Intel Corporation. All rights reserved.<BR>
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef MDE_MODULEPKG_PRE_PI_DXE_CIS_H_
+#define MDE_MODULEPKG_PRE_PI_DXE_CIS_H_
+
+///
+/// A memory region that describes system memory that has not been accepted
+/// by a corresponding call to the underlying isolation architecture.
+///
+/// This memory region has not been defined in PI spec, so it is defined in
+/// PrePiDxeCis.h. And it is defined in the format of captial letters
+/// because only capital letters are allowed to be used for #define declarations.
+///
+/// After this memory region is defined in PI spec, it should be a value in
+/// EFI_GCD_MEMORY_TYPE in PiDxeCis.h.
+///
+#define  EFI_GCD_MEMORY_TYPE_UNACCEPTED  7
+
+#endif
diff --git a/MdePkg/Include/Pi/PiDxeCis.h b/MdePkg/Include/Pi/PiDxeCis.h
index d0f2ed0..27b219a 100644
--- a/MdePkg/Include/Pi/PiDxeCis.h
+++ b/MdePkg/Include/Pi/PiDxeCis.h
@@ -56,7 +56,15 @@ typedef enum {
   /// system. If all memory has the same reliability, then this bit is not used.
   ///
   EfiGcdMemoryTypeMoreReliable,
-  EfiGcdMemoryTypeMaximum
+  // ///
+  // /// A memory region that describes system memory that has not been accepted
+  // /// by a corresponding call to the underlying isolation architecture.
+  // ///
+  // /// Please be noted:
+  // /// EfiGcdMemoryTypeUnaccepted is defined in PrePiDxeCis.h because it has not been
+  // /// defined in PI spec.
+  // EfiGcdMemoryTypeUnaccepted,
+  EfiGcdMemoryTypeMaximum = 8
 } EFI_GCD_MEMORY_TYPE;
 
 ///
diff --git a/MdePkg/Include/Uefi/UefiMultiPhase.h b/MdePkg/Include/Uefi/UefiMultiPhase.h
index 22bae43..7884913 100644
--- a/MdePkg/Include/Uefi/UefiMultiPhase.h
+++ b/MdePkg/Include/Uefi/UefiMultiPhase.h
@@ -103,6 +103,11 @@ typedef enum {
   /// however it happens to also support byte-addressable non-volatility.
   ///
   EfiPersistentMemory,
+  ///
+  /// A memory region that describes system memory that has not been accepted
+  /// by a corresponding call to the underlying isolation architecture.
+  ///
+  EfiUnacceptedMemoryType,
   EfiMaxMemoryType
 } EFI_MEMORY_TYPE;