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diff --git a/UnixPkg/Library/UnixBaseLib/X64/WriteDr2.asm b/UnixPkg/Library/UnixBaseLib/X64/WriteDr2.asm
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+++ b/UnixPkg/Library/UnixBaseLib/X64/WriteDr2.asm
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+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006, 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.
+;
+; Module Name:
+;
+; WriteDr2.Asm
+;
+; Abstract:
+;
+; AsmWriteDr2 function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+ .code
+
+;------------------------------------------------------------------------------
+; UINTN
+; EFIAPI
+; AsmWriteDr2 (
+; IN UINTN Value
+; );
+;------------------------------------------------------------------------------
+AsmWriteDr2 PROC
+ mov dr2, rcx
+ mov rax, rcx
+ ret
+AsmWriteDr2 ENDP
+
+ END