## @file | |
# Base Timer Library which uses the Time Stamp Counter in the processor. | |
# | |
# Note: There will be 1ms penalty to get TSC frequency every time | |
# by waiting for 3579 clocks of the ACPI timer, or 1ms. | |
# | |
# Note: This library is a sample implementation that depends on chipset ACPI timer. | |
# It may not work on new generation chipset. PcAtChipsetPkg AcpiTimerLib is | |
# the generic timer library that can replace this one. | |
# | |
# 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 - 2015, 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 = BaseTscTimerLib | |
FILE_GUID = D29338B9-50FE-4e4f-B7D4-A150A2C1F4FB | |
MODULE_TYPE = BASE | |
VERSION_STRING = 1.0 | |
LIBRARY_CLASS = TimerLib | |
# | |
# VALID_ARCHITECTURES = IA32 X64 | |
# | |
[Sources.common] | |
TscTimerLibShare.c | |
BaseTscTimerLib.c | |
TscTimerLibInternal.h | |
[Packages] | |
MdePkg/MdePkg.dec | |
PerformancePkg/PerformancePkg.dec | |
[LibraryClasses] | |
PcdLib | |
PciLib | |
IoLib | |
BaseLib | |
[Pcd.common] | |
gPerformancePkgTokenSpaceGuid.PcdPerfPkgAcpiIoPortBaseAddress ## SOMETIMES_CONSUMES |