--- /dev/null
+/** @file\r
+ This is a special GUID extension Hob to describe SMRAM memory regions.\r
+\r
+ This file defines:\r
+ * the GUID used to identify the GUID HOB for reserving SMRAM regions.\r
+ * the data structure of SMRAM descriptor to describe SMRAM candidate regions\r
+ * values of state of SMRAM candidate regions\r
+ * the GUID specific data structure of HOB for reserving SMRAM regions.\r
+\r
+ Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>\r
+ SPDX-License-Identifier: BSD-2-Clause-Patent\r
+\r
+ @par Revision Reference:\r
+ GUIDs defined in PI SPEC version 1.5.\r
+\r
+**/\r
+\r
+#ifndef _SMRAM_MEMORY_RESERVE_H_\r
+#define _SMRAM_MEMORY_RESERVE_H_\r
+\r
+#define EFI_SMM_SMRAM_MEMORY_GUID \\r
+ { \\r
+ 0x6dadf1d1, 0xd4cc, 0x4910, {0xbb, 0x6e, 0x82, 0xb1, 0xfd, 0x80, 0xff, 0x3d } \\r
+ }\r
+\r
+/**\r
+* The GUID extension hob is to describe SMRAM memory regions supported by the platform.\r
+**/\r
+typedef struct {\r
+ ///\r
+ /// Designates the number of possible regions in the system\r
+ /// that can be usable for SMRAM.\r
+ ///\r
+ UINT32 NumberOfSmmReservedRegions;\r
+ ///\r
+ /// Used throughout this protocol to describe the candidate\r
+ /// regions for SMRAM that are supported by this platform.\r
+ ///\r
+ EFI_SMRAM_DESCRIPTOR Descriptor[1];\r
+} EFI_SMRAM_HOB_DESCRIPTOR_BLOCK;\r
+\r
+extern EFI_GUID gEfiSmmSmramMemoryGuid;\r
+\r
+#endif\r
+\r