2 files changed, 48 insertions, 0 deletions
diff --git a/MdePkg/Include/Guid/SmramMemoryReserve.h b/MdePkg/Include/Guid/SmramMemoryReserve.h
new file mode 100644
index 0000000000..47320f3621
--- /dev/null
+++ b/MdePkg/Include/Guid/SmramMemoryReserve.h
@@ -0,0 +1,45 @@
+/** @file
+  This is a special GUID extension Hob to describe SMRAM memory regions.
+
+  This file defines:
+  * the GUID used to identify the GUID HOB for reserving SMRAM regions.
+  * the data structure of SMRAM descriptor to describe SMRAM candidate regions
+  * values of state of SMRAM candidate regions
+  * the GUID specific data structure of HOB for reserving SMRAM regions.
+
+  Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+  @par Revision Reference:
+  GUIDs defined in PI SPEC version 1.5.
+
+**/
+
+#ifndef _SMRAM_MEMORY_RESERVE_H_
+#define _SMRAM_MEMORY_RESERVE_H_
+
+#define EFI_SMM_SMRAM_MEMORY_GUID \
+  { \
+    0x6dadf1d1, 0xd4cc, 0x4910, {0xbb, 0x6e, 0x82, 0xb1, 0xfd, 0x80, 0xff, 0x3d } \
+  }
+
+/**
+* The GUID extension hob is to describe SMRAM memory regions supported by the platform.
+**/
+typedef struct {
+  ///
+  /// Designates the number of possible regions in the system
+  /// that can be usable for SMRAM.
+  ///
+  UINT32                NumberOfSmmReservedRegions;
+  ///
+  /// Used throughout this protocol to describe the candidate
+  /// regions for SMRAM that are supported by this platform.
+  ///
+  EFI_SMRAM_DESCRIPTOR  Descriptor[1];
+} EFI_SMRAM_HOB_DESCRIPTOR_BLOCK;
+
+extern EFI_GUID gEfiSmmSmramMemoryGuid;
+
+#endif
+
diff --git a/MdePkg/MdePkg.dec b/MdePkg/MdePkg.dec
index b382efd578..15a221d71f 100644
--- a/MdePkg/MdePkg.dec
+++ b/MdePkg/MdePkg.dec
@@ -749,6 +749,9 @@
   ## Include/Guid/GraphicsInfoHob.h
   gEfiGraphicsDeviceInfoHobGuid     = { 0xe5cb2ac9, 0xd35d, 0x4430, { 0x93, 0x6e, 0x1d, 0xe3, 0x32, 0x47, 0x8d, 0xe7 }}
 
+  ## Include/Guid/SmramMemoryReserve.h
+  gEfiSmmSmramMemoryGuid            = { 0x6dadf1d1, 0xd4cc, 0x4910, { 0xbb, 0x6e, 0x82, 0xb1, 0xfd, 0x80, 0xff, 0x3d }}
+
   #
   # GUID defined in PI1.6
   #