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diff --git a/OvmfPkg/PlatformPei/Cmos.h b/OvmfPkg/PlatformPei/Cmos.h
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+++ b/OvmfPkg/PlatformPei/Cmos.h
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+/** @file
+  PC/AT CMOS access routines
+
+  Copyright (c) 2006 - 2009, Intel Corporation<BR>
+  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.
+
+**/
+
+#ifndef __CMOS_H__
+#define __CMOS_H__
+
+/**
+  Reads 8-bits of CMOS data.
+
+  Reads the 8-bits of CMOS data at the location specified by Index.
+  The 8-bit read value is returned.
+
+  @param  Index  The CMOS location to read.
+
+  @return The value read.
+
+**/
+UINT8
+EFIAPI
+CmosRead8 (
+  IN      UINTN                     Index
+  );
+
+/**
+  Writes 8-bits of CMOS data.
+
+  Writes 8-bits of CMOS data to the location specified by Index
+  with the value specified by Value and returns Value.
+
+  @param  Index  The CMOS location to write.
+  @param  Value  The value to write to CMOS.
+
+  @return The value written to CMOS.
+
+**/
+UINT8
+EFIAPI
+CmosWrite8 (
+  IN      UINTN                     Index,
+  IN      UINT8                     Value
+  );
+
+
+#endif
+