6 files changed, 144 insertions, 0 deletions
diff --git a/MdePkg/Include/Library/PciSegmentInfoLib.h b/MdePkg/Include/Library/PciSegmentInfoLib.h
new file mode 100644
index 0000000000..588269a9ae
--- /dev/null
+++ b/MdePkg/Include/Library/PciSegmentInfoLib.h
@@ -0,0 +1,41 @@
+/** @file
+  Provides services to return segment information on a platform with multiple PCI segments.
+
+  This library is consumed by PciSegmentLib to support multiple segment PCI configuration access.
+
+  Copyright (c) 2017, 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 __PCI_SEGMENT_INFO_LIB__
+#define __PCI_SEGMENT_INFO_LIB__
+
+typedef struct {
+  UINT16               SegmentNumber;   ///< Segment number.
+  UINT64               BaseAddress;     ///< ECAM Base address.
+  UINT8                StartBusNumber;  ///< Start BUS number, for verifying the PCI Segment address.
+  UINT8                EndBusNumber;    ///< End BUS number, for verifying the PCI Segment address.
+} PCI_SEGMENT_INFO;
+
+/**
+  Return an array of PCI_SEGMENT_INFO holding the segment information.
+
+  Note: The returned array/buffer is owned by callee.
+
+  @param  Count  Return the count of segments.
+
+  @retval A callee owned array holding the segment information.
+**/
+PCI_SEGMENT_INFO *
+GetPciSegmentInfo (
+  UINTN  *Count
+  );
+
+#endif
diff --git a/MdePkg/Library/BasePciSegmentInfoLibNull/BasePciSegmentInfoLibNull.inf b/MdePkg/Library/BasePciSegmentInfoLibNull/BasePciSegmentInfoLibNull.inf
new file mode 100644
index 0000000000..5ae59fb2be
--- /dev/null
+++ b/MdePkg/Library/BasePciSegmentInfoLibNull/BasePciSegmentInfoLibNull.inf
@@ -0,0 +1,41 @@
+## @file
+# Instance of PCI SegmentInfo Library.
+#
+# Default PCI Segment Information Library that shouldn't be used by real platform.
+#
+# Copyright (c) 2017, 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.
+#
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x00010005
+  BASE_NAME                      = BasePciSegmentInfoLibNull
+  MODULE_UNI_FILE                = BasePciSegmentInfoLibNull.uni
+  FILE_GUID                      = 36B28584-C6AE-4B1B-A473-A51618EE525A
+  MODULE_TYPE                    = BASE
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = PciSegmentInfoLib
+
+#
+# The following information is for reference only and not required by the build tools.
+#
+#  VALID_ARCHITECTURES           = IA32 X64 IPF EBC
+#
+
+[Sources]
+  PciSegmentInfoLib.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+
+[LibraryClasses]
+  PcdLib
+  DebugLib
diff --git a/MdePkg/Library/BasePciSegmentInfoLibNull/BasePciSegmentInfoLibNull.uni b/MdePkg/Library/BasePciSegmentInfoLibNull/BasePciSegmentInfoLibNull.uni
new file mode 100644
index 0000000000..a956787637
--- /dev/null
+++ b/MdePkg/Library/BasePciSegmentInfoLibNull/BasePciSegmentInfoLibNull.uni
@@ -0,0 +1,20 @@
+// /** @file
+// Instance of PCI SegmentInfo Library.
+//
+// Default PCI Segment Information Library that shouldn't be used by real platform.
+//
+// Copyright (c) 2017, 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.
+//
+// **/
+
+
+#string STR_MODULE_ABSTRACT             #language en-US "Default instance of PCI SegmentInfo Library."
+
+#string STR_MODULE_DESCRIPTION          #language en-US "Default PCI Segment Information Library that shouldn't be used by real platform."
diff --git a/MdePkg/Library/BasePciSegmentInfoLibNull/PciSegmentInfoLib.c b/MdePkg/Library/BasePciSegmentInfoLibNull/PciSegmentInfoLib.c
new file mode 100644
index 0000000000..011a41450c
--- /dev/null
+++ b/MdePkg/Library/BasePciSegmentInfoLibNull/PciSegmentInfoLib.c
@@ -0,0 +1,38 @@
+/** @file
+  Default PCI Segment Information Library that returns one segment whose
+  segment base address equals to PcdPciExpressBaseAddress.
+
+  Copyright (c) 2017, 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.
+
+**/
+
+#include <Base.h>
+#include <Library/PciSegmentInfoLib.h>
+#include <Library/DebugLib.h>
+
+/**
+  Return an array of PCI_SEGMENT_INFO holding the segment information.
+
+  Note: The returned array/buffer is owned by callee.
+
+  @param  Count  Return the count of segments.
+
+  @retval A callee owned array holding the segment information.
+**/
+PCI_SEGMENT_INFO *
+GetPciSegmentInfo (
+  UINTN  *Count
+  )
+{
+  ASSERT (FALSE);
+  *Count = 0;
+  return NULL;
+}
diff --git a/MdePkg/MdePkg.dec b/MdePkg/MdePkg.dec
index 425004f9d8..ad13185ed6 100644
--- a/MdePkg/MdePkg.dec
+++ b/MdePkg/MdePkg.dec
@@ -131,6 +131,9 @@
   ##  @libraryclass  Provides a service to retrieve the PE/COFF entry point from a PE/COFF image.
   PeCoffGetEntryPointLib|Include/Library/PeCoffGetEntryPointLib.h
 
+  ##  @libraryclass  Provides services to return the PCI segment information.
+  PciSegmentInfoLib|Include/Library/PciSegmentInfoLib.h
+
   ##  @libraryclass  Provides services to access PCI Configuration Space on a platform with multiple PCI segments.
   PciSegmentLib|Include/Library/PciSegmentLib.h
 
diff --git a/MdePkg/MdePkg.dsc b/MdePkg/MdePkg.dsc
index 010ce533d7..e553a702a3 100644
--- a/MdePkg/MdePkg.dsc
+++ b/MdePkg/MdePkg.dsc
@@ -69,6 +69,7 @@
   MdePkg/Library/BasePciLibCf8/BasePciLibCf8.inf
   MdePkg/Library/BasePciLibPciExpress/BasePciLibPciExpress.inf
   MdePkg/Library/BasePciSegmentLibPci/BasePciSegmentLibPci.inf
+  MdePkg/Library/BasePciSegmentInfoLibNull/BasePciSegmentInfoLibNull.inf
   MdePkg/Library/BasePeCoffGetEntryPointLib/BasePeCoffGetEntryPointLib.inf
   MdePkg/Library/BasePeCoffLib/BasePeCoffLib.inf
   MdePkg/Library/BasePeCoffExtraActionLibNull/BasePeCoffExtraActionLibNull.inf