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diff --git a/Silicon/Intel/PurleyRcPkg/Include/Library/CsrToPcieAddress.h b/Silicon/Intel/PurleyRcPkg/Include/Library/CsrToPcieAddress.h
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+++ b/Silicon/Intel/PurleyRcPkg/Include/Library/CsrToPcieAddress.h
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+/** @file
+
+Copyright (c) 2018, 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 that 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 __CSR_TO_PCIE_ADDRESS_H__
+#define __CSR_TO_PCIE_ADDRESS_H__
+
+
+#include <UsraAccessType.h>
+
+//////////////////////////////////////////////////////////////////////////
+//
+// CSR to Pcie Address Library
+// This Lib provide the way use platform Library instance
+//
+//////////////////////////////////////////////////////////////////////////
+
+/**
+  This Lib Convert the logical address (CSR type, e.g. CPU ID, Boxtype, Box instance etc.) into physical address
+  
+  @param[in] Global               Global pointer
+  @param[in] Virtual              Virtual address
+  @param[in] Address              A pointer of the address of the USRA Address Structure
+  @param[out] AlignedAddress      A pointer of aligned address converted from USRA address
+
+  @retval NULL                    The function completed successfully.
+  @retval <>NULL                  Return Error
+**/
+UINTN
+EFIAPI
+CsrGetPcieAlignAddress (
+  IN VOID                     *Global,
+  IN BOOLEAN                  Virtual,
+  IN USRA_ADDRESS             *Address,
+  OUT UINTN                   *AlignedAddress
+  );
+
+
+#endif