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diff --git a/PerformancePkg/Library/TscTimerLib/PeiTscTimerLib.inf b/PerformancePkg/Library/TscTimerLib/PeiTscTimerLib.inf
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+## @file
+#  Pei Timer Library which uses the Time Stamp Counter in the processor.
+#
+#  A version of the Timer Library using the processor's TSC.
+#  The time stamp counter in newer processors may support an enhancement, referred to as invariant TSC.
+#  The invariant TSC runs at a constant rate in all ACPI P-, C-. and T-states.
+#  This is the architectural behavior moving forward.
+#  TSC reads are much more efficient and do not incur the overhead associated with a ring transition or
+#  access to a platform resource.
+#
+#  Copyright (c) 2009 - 2011, 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                      = PeiTscTimerLib
+  FILE_GUID                      = 342C36C0-15DF-43b4-9EC9-FBF748BFB3D1
+  MODULE_TYPE                    = PEIM
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = TimerLib|PEIM PEI_CORE
+
+
+#
+#  VALID_ARCHITECTURES           = IA32 X64
+#
+
+[Sources.common]
+  TscTimerLibShare.c
+  PeiTscTimerLib.c
+
+
+[Packages]
+  MdePkg/MdePkg.dec
+  PerformancePkg/PerformancePkg.dec
+
+
+[LibraryClasses]
+  PcdLib
+  PciLib
+  IoLib
+  BaseLib
+  HobLib
+
+[Guids]
+  gEfiTscFrequencyGuid                          ## PRODUCES ## Hob
+
+[Pcd.common]
+  gPerformancePkgTokenSpaceGuid.PcdPerfPkgAcpiIoPortBaseAddress