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diff --git a/MdeModulePkg/Core/PiSmmCore/PiSmmCorePrivateData.h b/MdeModulePkg/Core/PiSmmCore/PiSmmCorePrivateData.h
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+++ b/MdeModulePkg/Core/PiSmmCore/PiSmmCorePrivateData.h
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+/** @file
+  The internal header file that declared a data structure that is shared
+  between the SMM IPL and the SMM Core.
+
+  Copyright (c) 2009 - 2010, Intel Corporation.  All rights reserved.<BR>
+  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.             
+
+**/
+
+#ifndef _PI_SMM_CORE_PRIVATE_DATA_H_
+#define _PI_SMM_CORE_PRIVATE_DATA_H_
+
+///
+/// Signature for the private structure shared between the SMM IPL and the SMM Core
+///
+#define SMM_CORE_PRIVATE_DATA_SIGNATURE  SIGNATURE_32 ('s', 'm', 'm', 'c')
+
+///
+/// Private structure that is used to share information between the SMM IPL and 
+/// the SMM Core.  This structure is allocated from memory of type EfiRuntimeServicesData.
+/// Since runtime memory types are converted to available memory when a legacy boot 
+/// is performed, the SMM Core must access any fields of this structure if a legacy 
+/// boot is performed.  As a result, the SMM IPL must create an event notification 
+/// for the Legacy Boot event and notify the SMM Core that a legacy boot is being 
+/// performed.  The SMM Core can then use this information to filter accesses to 
+/// thos structure.
+///
+typedef struct {
+  UINTN                           Signature;
+
+  ///
+  /// The ImageHandle passed into the entry point of the SMM IPL.  This ImageHandle
+  /// is used by the SMM Core to fill in the ParentImageHandle field of the Loaded
+  /// Image Protocol for each SMM Driver that is dispatched by the SMM Core.
+  ///
+  EFI_HANDLE                      SmmIplImageHandle;
+
+  ///
+  /// The number of SMRAM ranges passed from the SMM IPL to the SMM Core.  The SMM
+  /// Core uses these ranges of SMRAM to initialize the SMM Core memory manager.
+  ///
+  UINTN                           SmramRangeCount;
+
+  ///
+  /// A table of SMRAM ranges passed from the SMM IPL to the SMM Core.  The SMM
+  /// Core uses these ranges of SMRAM to initialize the SMM Core memory manager.
+  ///
+  EFI_SMRAM_DESCRIPTOR            *SmramRanges;
+
+  ///
+  /// The SMM Foundation Entry Point.  The SMM Core fills in this field when the 
+  /// SMM Core is initialized.  The SMM IPL is responsbile for registering this entry 
+  /// point with the SMM Configuration Protocol.  The SMM Configuration Protocol may 
+  /// not be available at the time the SMM IPL and SMM Core are started, so the SMM IPL
+  /// sets up a protocol notification on the SMM Configuration Protocol and registers 
+  /// the SMM Foundation Entry Point as soon as the SMM Configuration Protocol is 
+  /// available.
+  ///
+  EFI_SMM_ENTRY_POINT             SmmEntryPoint;
+  
+  ///
+  /// Boolean flag set to TRUE while an SMI is being processed by the SMM Core.
+  /// 
+  BOOLEAN                         SmmEntryPointRegistered;
+
+  ///
+  /// Boolean flag set to TRUE while an SMI is being processed by the SMM Core.
+  /// 
+  BOOLEAN                         InSmm;
+
+  ///
+  /// This field is set by the SMM Core then the SMM Core is initialized.  This field is
+  /// used by the SMM Base 2 Protocol and SMM Communication Protocol implementations in
+  /// the SMM IPL.  
+  ///
+  EFI_SMM_SYSTEM_TABLE2           *Smst;
+
+  ///
+  /// This field is used by the SMM Communicatioon Protocol to pass a buffer into 
+  /// a software SMI handler and for the software SMI handler to pass a buffer back to
+  /// the caller of the SMM Communication Protocol.  
+  ///
+  VOID                            *CommunicationBuffer;
+
+  ///
+  /// This field is used by the SMM Communicatioon Protocol to pass the size of a buffer,
+  /// in bytes, into a software SMI handler and for the software SMI handler to pass the 
+  /// size, in bytes, of a buffer back to the caller of the SMM Communication Protocol.
+  ///
+  UINTN                           *BufferSize;
+
+  ///
+  /// This field is used by the SMM Communication Protocol to pass the return status from
+  /// a software SMI handler back to the caller of the SMM Communication Protocol.
+  ///
+  EFI_STATUS                      ReturnStatus;
+} SMM_CORE_PRIVATE_DATA;
+
+#endif