diff --git a/MdePkg/Library/BaseLib/BaseLib.inf b/MdePkg/Library/BaseLib/BaseLib.inf
index 55b332a399..7f4ba3fb09 100644
--- a/MdePkg/Library/BaseLib/BaseLib.inf
+++ b/MdePkg/Library/BaseLib/BaseLib.inf
@@ -588,6 +588,7 @@
 
   X64/CpuBreakpoint.nasm| INTEL
   X64/CpuBreakpoint.asm | INTEL 
+  X64/WriteMsr64.nasm| INTEL
   X64/WriteMsr64.asm | INTEL 
   X64/ReadMsr64.asm | INTEL 
   X64/RdRand.nasm| INTEL
diff --git a/MdePkg/Library/BaseLib/X64/WriteMsr64.nasm b/MdePkg/Library/BaseLib/X64/WriteMsr64.nasm
new file mode 100644
index 0000000000..2dbb4012b8
--- /dev/null
+++ b/MdePkg/Library/BaseLib/X64/WriteMsr64.nasm
@@ -0,0 +1,41 @@
+;------------------------------------------------------------------------------
+;
+; 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:
+;
+;   WriteMsr64.Asm
+;
+; Abstract:
+;
+;   AsmWriteMsr64 function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+    DEFAULT REL
+    SECTION .text
+
+;------------------------------------------------------------------------------
+; UINT64
+; EFIAPI
+; AsmWriteMsr64 (
+;   IN UINT32  Index,
+;   IN UINT64  Value
+;   );
+;------------------------------------------------------------------------------
+global ASM_PFX(AsmWriteMsr64)
+ASM_PFX(AsmWriteMsr64):
+    mov     rax, rdx                    ; meanwhile, rax <- return value
+    shr     rdx, 0x20                    ; edx:eax contains the value to write
+    wrmsr
+    ret
+