diff --git a/MdePkg/Library/BaseLib/BaseLib.inf b/MdePkg/Library/BaseLib/BaseLib.inf
index 3de83e9..54db21c 100644
--- a/MdePkg/Library/BaseLib/BaseLib.inf
+++ b/MdePkg/Library/BaseLib/BaseLib.inf
@@ -517,6 +517,7 @@
   X64/WriteIdtr.asm | MSFT
   X64/ReadIdtr.nasm| MSFT
   X64/ReadIdtr.asm | MSFT
+  X64/WriteGdtr.nasm| MSFT
   X64/WriteGdtr.asm | MSFT
   X64/ReadGdtr.asm | MSFT
   X64/ReadTr.asm | MSFT
@@ -625,6 +626,7 @@
   X64/WriteIdtr.asm | INTEL
   X64/ReadIdtr.nasm| INTEL
   X64/ReadIdtr.asm | INTEL
+  X64/WriteGdtr.nasm| INTEL
   X64/WriteGdtr.asm | INTEL
   X64/ReadGdtr.asm | INTEL
   X64/ReadTr.asm | INTEL
diff --git a/MdePkg/Library/BaseLib/X64/WriteGdtr.nasm b/MdePkg/Library/BaseLib/X64/WriteGdtr.nasm
new file mode 100644
index 0000000..36760b5
--- /dev/null
+++ b/MdePkg/Library/BaseLib/X64/WriteGdtr.nasm
@@ -0,0 +1,38 @@
+;------------------------------------------------------------------------------
+;
+; 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:
+;
+;   WriteGdtr.Asm
+;
+; Abstract:
+;
+;   AsmWriteGdtr function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+    DEFAULT REL
+    SECTION .text
+
+;------------------------------------------------------------------------------
+; VOID
+; EFIAPI
+; InternalX86WriteGdtr (
+;   IN      CONST IA32_DESCRIPTOR     *Idtr
+;   );
+;------------------------------------------------------------------------------
+global ASM_PFX(InternalX86WriteGdtr)
+ASM_PFX(InternalX86WriteGdtr):
+    lgdt    [rcx]
+    ret
+