2 # Pei Timer Library which uses the Time Stamp Counter in the processor.
4 # Note: This library is a sample implementation that depends on chipset ACPI timer.
5 # It may not work on new generation chipset. PcAtChipsetPkg AcpiTimerLib is
6 # the generic timer library that can replace this one.
8 # A version of the Timer Library using the processor's TSC.
9 # The time stamp counter in newer processors may support an enhancement, referred to as invariant TSC.
10 # The invariant TSC runs at a constant rate in all ACPI P-, C-. and T-states.
11 # This is the architectural behavior moving forward.
12 # TSC reads are much more efficient and do not incur the overhead associated with a ring transition or
13 # access to a platform resource.
15 # Copyright (c) 2009 - 2015, Intel Corporation. All rights reserved.<BR>
16 # This program and the accompanying materials
17 # are licensed and made available under the terms and conditions of the BSD License
18 # which accompanies this distribution. The full text of the license may be found at
19 # http://opensource.org/licenses/bsd-license.php
20 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
21 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
26 INF_VERSION = 0x00010005
27 BASE_NAME = PeiTscTimerLib
28 FILE_GUID = 342C36C0-15DF-43b4-9EC9-FBF748BFB3D1
31 LIBRARY_CLASS = TimerLib|PEIM PEI_CORE
35 # VALID_ARCHITECTURES = IA32 X64
46 PerformancePkg/PerformancePkg.dec
57 gEfiTscFrequencyGuid ## PRODUCES ## HOB
60 gPerformancePkgTokenSpaceGuid.PcdPerfPkgAcpiIoPortBaseAddress ## SOMETIMES_CONSUMES