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PcAtChipsetPkg AcpiTimerLib: Clear bits [31:24] after reading by IoRead32()

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Clear bits [31:24] after reading ACPI timer count by IoRead32(), and also add
comments "Note: The implementation uses the lower 24-bits of the ACPI timer
and is compatible with both 24-bit and 32-bit ACPI timers." in INF.

Cc: Michael Kinney <michael.d.kinney@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Michael Kinney <michael.d.kinney@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
This commit is contained in:
Star Zeng
2016-09-28 18:17:55 +08:00
parent 3643e8e70d
commit b3b58d4da7
3 changed files with 15 additions and 9 deletions
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7
PcAtChipsetPkg/Library/AcpiTimerLib/BaseAcpiTimerLib.inf
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@@ -2,9 +2,12 @@
# Base ACPI Timer Library
#
# Provides basic timer support using the ACPI timer hardware. The performance
# counter features are provided by the processors time stamp counter.
# counter features are provided by the processors time stamp counter.
#
# Copyright (c) 2013 - 2015, Intel Corporation. All rights reserved.<BR>
# Note: The implementation uses the lower 24-bits of the ACPI timer and
# is compatible with both 24-bit and 32-bit ACPI timers.
#
# Copyright (c) 2013 - 2016, 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