1 files changed, 42 insertions, 0 deletions
diff --git a/UefiCpuPkg/Include/Guid/MmUnblockRegion.h b/UefiCpuPkg/Include/Guid/MmUnblockRegion.h
new file mode 100644
index 0000000..f6a33c3
--- /dev/null
+++ b/UefiCpuPkg/Include/Guid/MmUnblockRegion.h
@@ -0,0 +1,42 @@
+/** @file
+  Defines the GUIDed HOB that describes the memory region to be unblocked in MM environment.
+
+  Copyright (c) 2024, Intel Corporation. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+
+#ifndef MM_UNBLOCK_REGION_H_
+#define MM_UNBLOCK_REGION_H_
+
+///
+/// The GUID of the UnblockRegion GUIDed HOB.
+///
+#define MM_UNBLOCK_REGION_HOB_GUID \
+  { \
+    0x7c316fb3, 0x849e, 0x4ee7, {0x87, 0xfc, 0x16, 0x2d, 0x0b, 0x03, 0x42, 0xbf } \
+  }
+
+///
+/// The structure defines the data layout of the UnblockRegion GUIDed HOB.
+///
+typedef struct {
+  ///
+  /// Physical address of the first byte in the memory region. PhysicalStart must be
+  /// aligned on a 4 KiB boundary.
+  ///
+  EFI_PHYSICAL_ADDRESS    PhysicalStart;
+
+  ///
+  /// Number of 4 KiB pages in the memory region.
+  ///
+  UINT64                  NumberOfPages;
+
+  ///
+  /// GUID to identify the memory region.
+  ///
+  EFI_GUID                IdentifierGuid;
+} MM_UNBLOCK_REGION;
+
+extern EFI_GUID  gMmUnblockRegionHobGuid;
+
+#endif