1 files changed, 40 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/X64/ReadMsr64.asm b/MdePkg/Library/BaseLib/X64/ReadMsr64.asm
new file mode 100644
index 0000000000..4444c18676
--- /dev/null
+++ b/MdePkg/Library/BaseLib/X64/ReadMsr64.asm
@@ -0,0 +1,40 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006, Intel Corporation
+; All rights reserved. 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:
+;
+;   ReadMsr64.Asm
+;
+; Abstract:
+;
+;   AsmReadMsr64 function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+    .code
+
+;------------------------------------------------------------------------------
+; UINT64
+; EFIAPI
+; AsmReadMsr64 (
+;   IN UINT32  Index
+;   );
+;------------------------------------------------------------------------------
+AsmReadMsr64    PROC
+    rdmsr
+    shl     rax, 20h
+    shrd    rax, rdx, 20h
+    ret
+AsmReadMsr64    ENDP
+
+    END