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diff --git a/UnixPkg/Library/UnixBaseLib/ARShiftU64.c b/UnixPkg/Library/UnixBaseLib/ARShiftU64.c
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+++ b/UnixPkg/Library/UnixBaseLib/ARShiftU64.c
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+/** @file
+  Math worker functions.
+
+  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.
+
+**/
+
+#include "BaseLibInternals.h"
+
+/**
+  Shifts a 64-bit integer right between 0 and 63 bits. The high bits are filled
+  with the original integer's bit 63. The shifted value is returned.
+
+  This function shifts the 64-bit value Operand to the right by Count bits. The
+  high Count bits are set to bit 63 of Operand.  The shifted value is returned.
+
+  If Count is greater than 63, then ASSERT().
+
+  @param  Operand The 64-bit operand to shift right.
+  @param  Count   The number of bits to shift right.
+
+  @return Operand >> Count
+
+**/
+UINT64
+EFIAPI
+ARShiftU64 (
+  IN      UINT64                    Operand,
+  IN      UINTN                     Count
+  )
+{
+  ASSERT (Count < 64);
+  return InternalMathARShiftU64 (Operand, Count);
+}