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diff --git a/MdePkg/Library/PeiSmbusLib/InternalSmbusLib.h b/MdePkg/Library/PeiSmbusLib/InternalSmbusLib.h
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+++ b/MdePkg/Library/PeiSmbusLib/InternalSmbusLib.h
@@ -0,0 +1,112 @@
+/** @file
+Internal header file for Smbus library.
+
+Copyright (c) 2006, Intel Corporation<BR>
+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: SmbusLib.c
+
+**/
+
+#ifndef __INTERNAL_SMBUS_LIB_H
+#define __INTERNAL_SMBUS_LIB_H
+
+#define SMBUS_LIB_PEC(SmBusAddress)           ((BOOLEAN) ((SmBusAddress) & 0x01))
+#define SMBUS_LIB_SLAVE_ADDRESS(SmBusAddress) (((SmBusAddress) >> 1)     & 0x7f)
+#define SMBUS_LIB_COMMAND(SmBusAddress)       (((SmBusAddress) >> 8)     & 0xff)
+#define SMBUS_LIB_LENGTH(SmBusAddress)        (((SmBusAddress) >> 16)    & 0x1f)
+#define SMBUS_LIB_RESEARVED(SmBusAddress)     (((SmBusAddress) >> 21))
+
+//
+// Declaration for internal functions
+//
+/**
+  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    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     VOID                       *Buffer,
+     OUT RETURN_STATUS              *Status        OPTIONAL
+  );
+
+/**
+  Assigns an SMBUS slave addresses.
+
+  Assigns the SMBUS device specified by Uuid the slave address specified by SmBusAddress.
+  The status of the executed command is returned.
+  If Command in SmBusAddress is not zero, then ASSERT().
+  If Length in SmBusAddress is not zero, then ASSERT().
+  If PEC in SmBusAddress is set, then ASSERT().
+  If any reserved bits of SmBusAddress are set, then ASSERT().
+
+  @param  SmBusAddress        Address that encodes the SMBUS Slave Address,
+                              SMBUS Command, SMBUS Data Length, and PEC.
+  @param  Uuid                Pointer to the UUID of the device to assign a slave address.
+                              It will assign to all SMBUS slave devices if it is NULL.
+
+  @retval RETURN_SUCCESS      The SMBUS command was executed.
+  @retval RETURN_TIMEOUT      A timeout occurred while executing the SMBUS command.
+  @retval RETURN_DEVICE_ERROR The request was not completed because a failure reflected
+                              in the Host Status Register bit.
+                              Device errors are a result of a transaction collision, illegal command field,
+                              unclaimed cycle (host initiated), or bus errors (collisions).
+
+**/
+RETURN_STATUS
+InternalSmBusArpDevice (
+  IN UINTN          SmBusAddress,
+  IN CONST GUID     *Uuid       OPTIONAL 
+  );
+
+/**
+  Retrieves the mapping of all the SMBus devices.
+
+  The GetArpMap() function returns the mapping of all the SMBus devices 
+  that are enumerated by the SMBus host driver. 
+ 
+  @param  Length              Size of the buffer that contains the SMBus device map.
+  @param  SmbusDeviceMap      The pointer to the device map as enumerated by the SMBus controller driver.
+
+  @retval RETURN_SUCCESS      The SMBUS command was executed.
+  @retval RETURN_TIMEOUT      A timeout occurred while executing the SMBUS command.
+  @retval RETURN_DEVICE_ERROR The request was not completed because a failure reflected
+                              in the Host Status Register bit.
+                              Device errors are a result of a transaction collision, illegal command field,
+                              unclaimed cycle (host initiated), or bus errors (collisions).
+
+**/
+RETURN_STATUS
+InternalGetArpMap (
+  OUT UINTN                         *Length,
+  OUT EFI_SMBUS_DEVICE_MAP          **SmbusDeviceMap
+  );
+
+#endif