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diff --git a/DuetPkg/Include/Guid/PciExpressBaseAddress.h b/DuetPkg/Include/Guid/PciExpressBaseAddress.h
new file mode 100644
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+++ b/DuetPkg/Include/Guid/PciExpressBaseAddress.h
@@ -0,0 +1,46 @@
+/*++
+
+Copyright (c) 2006, Intel Corporation                                                         
+All rights reserved. This program and the accompanying materials                          
+are licensed and made available under the terms and conditions of the BSD License         
+which accompanies this distribution.  The full text of the license may be found at        
+http://opensource.org/licenses/bsd-license.php                                            
+                                                                                          
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.             
+
+Module Name:
+  
+    PciExpressBaseAddress.h
+    
+Abstract:
+
+
+   GUIDs used for PciExpress Base Address
+
+--*/
+
+#ifndef _EFI_PCI_EXPRESS_BASE_ADDRESS_H_
+#define _EFI_PCI_EXPRESS_BASE_ADDRESS_H_
+
+#define EFI_PCI_EXPRESS_BASE_ADDRESS_GUID \
+  { \
+    0x3677d529, 0x326f, 0x4603, 0xa9, 0x26, 0xea, 0xac, 0xe0, 0x1d, 0xcb, 0xb0 \
+  }
+
+//
+// Following structure defines PCI Express Base Address information.
+// This information is platform specific, and built into hob in PEI phase.
+// It can be consumed by PEI PCI driver and DXE PCI driver.
+//
+#pragma pack(1)
+typedef struct _EFI_PCI_EXPRESS_BASE_ADDRESS_INFORMATION {
+  UINT32       HostBridgeNumber;
+  UINT32       RootBridgeNumber;
+  UINT64       PciExpressBaseAddress;
+} EFI_PCI_EXPRESS_BASE_ADDRESS_INFORMATION;
+#pragma pack()
+
+extern EFI_GUID gEfiPciExpressBaseAddressGuid;
+
+#endif