diff --git a/MdePkg/Library/BaseLib/BaseLib.inf b/MdePkg/Library/BaseLib/BaseLib.inf
index 4cd1516aed..47dfd45429 100644
--- a/MdePkg/Library/BaseLib/BaseLib.inf
+++ b/MdePkg/Library/BaseLib/BaseLib.inf
@@ -245,6 +245,7 @@
   Ia32/ReadEs.asm | INTEL 
   Ia32/ReadDs.nasm| INTEL
   Ia32/ReadDs.asm | INTEL 
+  Ia32/ReadCs.nasm| INTEL
   Ia32/ReadCs.asm | INTEL 
   Ia32/ReadMsr64.asm | INTEL 
   Ia32/ReadMm7.asm | INTEL 
diff --git a/MdePkg/Library/BaseLib/Ia32/ReadCs.nasm b/MdePkg/Library/BaseLib/Ia32/ReadCs.nasm
new file mode 100644
index 0000000000..8c2b58ddcb
--- /dev/null
+++ b/MdePkg/Library/BaseLib/Ia32/ReadCs.nasm
@@ -0,0 +1,37 @@
+;------------------------------------------------------------------------------
+;
+; 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:
+;
+;   ReadCs.Asm
+;
+; Abstract:
+;
+;   AsmReadCs function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+    SECTION .text
+
+;------------------------------------------------------------------------------
+; UINT16
+; EFIAPI
+; AsmReadCs (
+;   VOID
+;   );
+;------------------------------------------------------------------------------
+global ASM_PFX(AsmReadCs)
+ASM_PFX(AsmReadCs):
+    mov     eax, cs
+    ret
+