PerformancePkg: Update comments on TscTimerLib

TscTimerLib is a sample implementation that depends on chipset ACPI timer. 

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16457 6f19259b-4bc3-4df7-8a09-765794883524

PerformancePkg/Library/TscTimerLib/BaseTscTimerLib.inf

@@ -4,6 +4,10 @@
 #  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.
@@ -11,7 +15,7 @@
 #  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>
+#  Copyright (c) 2009 - 2014, 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

PerformancePkg/Library/TscTimerLib/DxeTscTimerLib.inf

@@ -1,6 +1,10 @@
 ## @file
 #  Dxe Timer Library which uses the Time Stamp Counter in the processor.
 #
+#  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.
@@ -8,7 +12,7 @@
 #  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>
+#  Copyright (c) 2009 - 2014, 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

PerformancePkg/Library/TscTimerLib/PeiTscTimerLib.inf

@@ -1,6 +1,10 @@
 ## @file
 #  Pei Timer Library which uses the Time Stamp Counter in the processor.
 #
+#  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.
@@ -8,7 +12,7 @@
 #  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>
+#  Copyright (c) 2009 - 2014, 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