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diff --git a/MdePkg/Library/PciSegmentLibSegmentInfo/PciSegmentLibCommon.h b/MdePkg/Library/PciSegmentLibSegmentInfo/PciSegmentLibCommon.h
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+/** @file
+ Provide common routines used by BasePciSegmentLibSegmentInfo and
+ DxeRuntimePciSegmentLibSegmentInfo libraries.
+
+ Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef _PCI_SEGMENT_LIB_COMMON_H_
+#define _PCI_SEGMENT_LIB_COMMON_H_
+
+#include <Base.h>
+#include <IndustryStandard/PciExpress21.h>
+#include <Library/BaseLib.h>
+#include <Library/DebugLib.h>
+#include <Library/IoLib.h>
+#include <Library/PciSegmentLib.h>
+#include <Library/PciSegmentInfoLib.h>
+
+/**
+ Return the linear address for the physical address.
+
+ @param Address The physical address.
+
+ @retval The linear address.
+**/
+UINTN
+PciSegmentLibVirtualAddress (
+ IN UINTN Address
+ );
+
+/**
+ Internal function that converts PciSegmentLib format address that encodes the PCI Bus, Device,
+ Function and Register to ECAM (Enhanced Configuration Access Mechanism) address.
+
+ @param Address The address that encodes the PCI Bus, Device, Function and
+ Register.
+ @param SegmentInfo An array of PCI_SEGMENT_INFO holding the segment information.
+ @param Count Number of segments.
+
+ @retval ECAM address.
+**/
+UINTN
+PciSegmentLibGetEcamAddress (
+ IN UINT64 Address,
+ IN CONST PCI_SEGMENT_INFO *SegmentInfo,
+ IN UINTN Count
+ );
+
+#endif