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diff --git a/ChvRefCodePkg/CherryViewSoc/SouthCluster/Include/IosfSbDefinitions.h b/ChvRefCodePkg/CherryViewSoc/SouthCluster/Include/IosfSbDefinitions.h
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+++ b/ChvRefCodePkg/CherryViewSoc/SouthCluster/Include/IosfSbDefinitions.h
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+/** @file
+  General IOSF-SB structure and register definitions.
+
+  Copyright (c) 2012 - 2015, 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.
+
+**/
+
+#ifndef _IOSF_SB_DEFINITIONS_H_
+#define _IOSF_SB_DEFINITIONS_H_
+
+///
+/// Message Bus Registers
+///
+#define MC_MCR            0x000000D0 // Cunit Message Control Register
+#define MC_MDR            0x000000D4 // Cunit Message Data Register
+#define MC_MCRX           0x000000D8 // Cunit Message Control Register Extension
+#define MC_MCRXX          0x000000DC // Cunit Message Control Register Extension 2
+
+///
+/// Message Bus API
+///
+#define MSG_BUS_ENABLED   0x000000F0
+#define MSGBUS_MASKHI     0xFFFFFF00
+#define MSGBUS_MASKLO     0x000000FF
+#define MESSAGE_DWORD_EN  BIT4 | BIT5 | BIT6 | BIT7
+
+typedef struct _PCH_MSG_BUS_TABLE_STRUCT {
+  UINT8       PortId;
+  UINT32      Address;
+  UINT32      AndMask;
+  UINT32      OrMask;
+  UINT8       ReadOpCode;
+  UINT8       WriteOpCode;
+} PCH_MSG_BUS_TABLE_STRUCT;
+
+#endif