1 files changed, 43 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/x64/ReadPmc.asm b/MdePkg/Library/BaseLib/x64/ReadPmc.asm
new file mode 100644
index 0000000000..b5004d6f34
--- /dev/null
+++ b/MdePkg/Library/BaseLib/x64/ReadPmc.asm
@@ -0,0 +1,43 @@
+;------------------------------------------------------------------------------
+;
+; 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:
+;
+;   ReadPmc.Asm
+;
+; Abstract:
+;
+;   AsmReadPmc function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+    .code
+
+;------------------------------------------------------------------------------
+; UINT64
+; EFIAPI
+; AsmReadPmc (
+;   IN UINT32   PmcIndex
+;   );
+;------------------------------------------------------------------------------
+AsmReadPmc  PROC
+    rdpmc
+    shl     ecx, 1
+    jnc     @F
+    shl     rax, 20h
+    shrd    rax, rdx, 20h
+@@:
+    ret
+AsmReadPmc  ENDP
+
+    END