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diff --git a/SecurityPkg/Include/Ppi/LockPhysicalPresence.h b/SecurityPkg/Include/Ppi/LockPhysicalPresence.h
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+++ b/SecurityPkg/Include/Ppi/LockPhysicalPresence.h
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+/** @file
+  This file defines the lock physical Presence PPI. This PPI is 
+  produced by a platform specific PEIM and consumed by the TPM 
+  PEIM.
+
+Copyright (c) 2011, 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 __PEI_LOCK_PHYSICAL_PRESENCE_H__
+#define __PEI_LOCK_PHYSICAL_PRESENCE_H__
+
+///
+/// Global ID for the PEI_LOCK_PHYSICAL_PRESENCE_PPI_GUID.  
+///
+#define PEI_LOCK_PHYSICAL_PRESENCE_PPI_GUID  \
+  { \
+    0xef9aefe5, 0x2bd3, 0x4031, { 0xaf, 0x7d, 0x5e, 0xfe, 0x5a, 0xbb, 0x9a, 0xd } \
+  }
+
+///
+/// Forward declaration for the PEI_LOCK_PHYSICAL_PRESENCE_PPI
+///
+typedef struct _PEI_LOCK_PHYSICAL_PRESENCE_PPI PEI_LOCK_PHYSICAL_PRESENCE_PPI;
+
+/**
+  This interface returns whether TPM physical presence needs be locked.
+
+  @param[in]  PeiServices       The pointer to the PEI Services Table.
+
+  @retval     TRUE              The TPM physical presence should be locked.
+  @retval     FALSE             The TPM physical presence cannot be locked.
+
+**/
+typedef
+BOOLEAN
+(EFIAPI *PEI_LOCK_PHYSICAL_PRESENCE)(
+  IN CONST  EFI_PEI_SERVICES                    **PeiServices
+);
+
+///
+/// This service abstracts TPM physical presence lock interface. It is necessary for  
+/// safety to convey this information to the TPM driver so that TPM physical presence  
+/// can be locked as early as possible. This PPI is produced by a platform specific 
+/// PEIM and consumed by the TPM PEIM.
+///
+struct _PEI_LOCK_PHYSICAL_PRESENCE_PPI {
+  PEI_LOCK_PHYSICAL_PRESENCE  LockPhysicalPresence;
+};
+
+extern EFI_GUID  gPeiLockPhysicalPresencePpiGuid;
+
+#endif  //  __PEI_LOCK_PHYSICAL_PRESENCE_H__
+\ No newline at end of file