diff --git a/MdePkg/Library/BaseLib/BaseLib.inf b/MdePkg/Library/BaseLib/BaseLib.inf
index 389fd4b..03ee328 100644
--- a/MdePkg/Library/BaseLib/BaseLib.inf
+++ b/MdePkg/Library/BaseLib/BaseLib.inf
@@ -491,6 +491,7 @@
   X64/WriteMm0.asm | MSFT
   X64/ReadMm7.nasm| MSFT
   X64/ReadMm7.asm | MSFT
+  X64/ReadMm6.nasm| MSFT
   X64/ReadMm6.asm | MSFT
   X64/ReadMm5.asm | MSFT
   X64/ReadMm4.asm | MSFT
@@ -586,6 +587,7 @@
   X64/WriteMm0.asm | INTEL
   X64/ReadMm7.nasm| INTEL
   X64/ReadMm7.asm | INTEL
+  X64/ReadMm6.nasm| INTEL
   X64/ReadMm6.asm | INTEL
   X64/ReadMm5.asm | INTEL
   X64/ReadMm4.asm | INTEL
diff --git a/MdePkg/Library/BaseLib/X64/ReadMm6.nasm b/MdePkg/Library/BaseLib/X64/ReadMm6.nasm
new file mode 100644
index 0000000..423ad3b
--- /dev/null
+++ b/MdePkg/Library/BaseLib/X64/ReadMm6.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:
+;
+;   ReadMm6.Asm
+;
+; Abstract:
+;
+;   AsmReadMm6 function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+    DEFAULT REL
+    SECTION .text
+
+;------------------------------------------------------------------------------
+; UINT64
+; EFIAPI
+; AsmReadMm6 (
+;   VOID
+;   );
+;------------------------------------------------------------------------------
+global ASM_PFX(AsmReadMm6)
+ASM_PFX(AsmReadMm6):
+    ;
+    ; 64-bit MASM doesn't support MMX instructions, so use opcode here
+    ;
+    DB      0x48, 0xf, 0x7e, 0xf0
+    ret
+