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diff --git a/Core/MdePkg/Library/PeiSmbusLibSmbus2Ppi/InternalSmbusLib.h b/Core/MdePkg/Library/PeiSmbusLibSmbus2Ppi/InternalSmbusLib.h
new file mode 100644
index 0000000000..00f8078f76
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+++ b/Core/MdePkg/Library/PeiSmbusLibSmbus2Ppi/InternalSmbusLib.h
@@ -0,0 +1,80 @@
+/** @file
+Internal header file for Smbus library.
+
+Copyright (c) 2006 - 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 __INTERNAL_SMBUS_LIB_H_
+#define __INTERNAL_SMBUS_LIB_H_
+
+
+#include <PiPei.h>
+
+#include <Ppi/Smbus2.h>
+
+#include <Library/SmbusLib.h>
+#include <Library/DebugLib.h>
+#include <Library/PeiServicesLib.h>
+#include <Library/BaseMemoryLib.h>
+
+//
+// Declaration for internal functions
+//
+
+/**
+  Gets Smbus PPIs.
+
+  This internal function retrieves Smbus PPI from PPI database.
+
+  @param  VOID
+
+  @return The pointer to Smbus PPI.
+
+**/
+EFI_PEI_SMBUS2_PPI *
+InternalGetSmbusPpi (
+  VOID
+  );
+
+/**
+  Executes an SMBus operation to an SMBus controller.
+
+  This function provides a standard way to execute Smbus script
+  as defined in the SmBus Specification. The data can either be of
+  the Length byte, word, or a block of data.
+
+  @param  SmbusOperation  Signifies which particular SMBus hardware protocol 
+                          instance that it will use to execute the SMBus transactions.
+  @param  SmBusAddress    The address that encodes the SMBUS Slave Address,
+                          SMBUS Command, SMBUS Data Length, and PEC.
+  @param  Length          Signifies the number of bytes that this operation will 
+                          do. The maximum number of bytes can be revision specific 
+                          and operation specific.
+  @param  Buffer          Contains the value of data to execute to the SMBus slave 
+                          device. Not all operations require this argument. The 
+                          length of this buffer is identified by Length.
+  @param  Status          Return status for the executed command.
+                          This is an optional parameter and may be NULL.
+
+  @return The actual number of bytes that are executed for this operation.
+
+**/
+UINTN
+InternalSmBusExec (
+  IN     EFI_SMBUS_OPERATION        SmbusOperation,
+  IN     UINTN                      SmBusAddress,
+  IN     UINTN                      Length,
+  IN OUT VOID                       *Buffer,
+     OUT RETURN_STATUS              *Status        OPTIONAL
+  );
+
+#endif