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diff --git a/MdePkg/Library/BaseMemoryLibOptPei/ScanMem64Wrapper.c b/MdePkg/Library/BaseMemoryLibOptPei/ScanMem64Wrapper.c
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+/** @file
+ ScanMem64() implementation.
+
+ 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.
+
+ The following BaseMemoryLib instances share the same version of this file:
+
+ BaseMemoryLib
+ BaseMemoryLibMmx
+ BaseMemoryLibSse2
+ BaseMemoryLibRepStr
+ PeiMemoryLib
+ DxeMemoryLib
+
+**/
+
+//
+// Include common header file for this module.
+//
+
+
+#include "MemLibInternals.h"
+
+/**
+ Scans a target buffer for a 64-bit value, and returns a pointer to the matching 64-bit value
+ in the target buffer.
+
+ This function searches target the buffer specified by Buffer and Length from the lowest
+ address to the highest address for a 64-bit value that matches Value. If a match is found,
+ then a pointer to the matching byte in the target buffer is returned. If no match is found,
+ then NULL is returned. If Length is 0, then NULL is returned.
+ If Length > 0 and Buffer is NULL, then ASSERT().
+ If Buffer is not aligned on a 64-bit boundary, then ASSERT().
+ If Length is not aligned on a 64-bit boundary, then ASSERT().
+ If Length is greater than (MAX_ADDRESS ? Buffer + 1), then ASSERT().
+
+ @param Buffer Pointer to the target buffer to scan.
+ @param Length Number of bytes in Buffer to scan.
+ @param Value Value to search for in the target buffer.
+
+ @return A pointer to the matching byte in the target buffer or NULL otherwise.
+
+**/
+VOID *
+EFIAPI
+ScanMem64 (
+ IN CONST VOID *Buffer,
+ IN UINTN Length,
+ IN UINT64 Value
+ )
+{
+ if (Length == 0) {
+ return NULL;
+ }
+
+ ASSERT (Buffer != NULL);
+ ASSERT (((UINTN)Buffer & (sizeof (Value) - 1)) == 0);
+ ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)Buffer));
+ ASSERT ((Length & (sizeof (Value) - 1)) == 0);
+
+ return (VOID*)InternalMemScanMem64 (Buffer, Length / sizeof (Value), Value);
+}