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diff --git a/roms/edk2/MdePkg/Library/BaseLib/RShiftU64.c b/roms/edk2/MdePkg/Library/BaseLib/RShiftU64.c
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+++ b/roms/edk2/MdePkg/Library/BaseLib/RShiftU64.c
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+/** @file
+ Math worker functions.
+
+ Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include "BaseLibInternals.h"
+
+/**
+ Shifts a 64-bit integer right between 0 and 63 bits. This high bits are
+ filled with zeros. 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 zero. 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
+RShiftU64 (
+ IN UINT64 Operand,
+ IN UINTN Count
+ )
+{
+ ASSERT (Count < 64);
+ return InternalMathRShiftU64 (Operand, Count);
+}