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diff --git a/MdePkg/Library/UefiPciSegmentLibPciRootBridgeIo/PciSegmentLib.h b/MdePkg/Library/UefiPciSegmentLibPciRootBridgeIo/PciSegmentLib.h
new file mode 100644
index 0000000000..00129edea6
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+++ b/MdePkg/Library/UefiPciSegmentLibPciRootBridgeIo/PciSegmentLib.h
@@ -0,0 +1,59 @@
+/** @file
+  Include file of PciSegmentPciRootBridgeIo Library.
+
+  Copyright (c) 2007 - 2008, 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.
+
+**/
+
+#ifndef __DXE_PCI_SEGMENT_LIB__
+#define __DXE_PCI_SEGMENT_LIB__
+
+#include <PiDxe.h>
+
+#include <Protocol/PciRootBridgeIo.h>
+
+#include <Library/PciSegmentLib.h>
+#include <Library/BaseLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/DebugLib.h>
+
+#include <IndustryStandard/Acpi.h>
+
+typedef struct {
+  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL    *PciRootBridgeIo;
+  UINT32                             SegmentNumber;
+  UINT64                             MinBusNumber;
+  UINT64                             MaxBusNumber;
+} PCI_ROOT_BRIDGE_DATA;
+
+/**
+  Assert the validity of a PCI Segment address.
+  A valid PCI address should not contain 1's in bits 31:28
+
+  @param  A The address to validate.
+  @param  M Additional bits to assert to be zero.
+
+**/
+#define ASSERT_INVALID_PCI_SEGMENT_ADDRESS(A,M) \
+  ASSERT (((A) & (0xf0000000 | (M))) == 0)
+
+/**
+  Translate PCI Lib address into format of PCI Root Bridge I/O Protocol
+
+  @param  A  Address that encodes the PCI Bus, Device, Function and
+             Register.
+
+**/
+#define PCI_TO_PCI_ROOT_BRIDGE_IO_ADDRESS(A) \
+  ((((A) << 4) & 0xff000000) | (((A) >> 4) & 0x00000700) | (((A) << 1) & 0x001f0000) | (LShiftU64((A) & 0xfff, 32)))
+
+#endif