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PcAtChipsetPkg AcpiTimerLib: Clear bits [31:24] after reading by IoRead32()
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>
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@ -162,14 +162,14 @@ InternalAcpiDelay (
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//
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//
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// The target timer count is calculated here
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// The target timer count is calculated here
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//
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//
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Ticks = IoRead32 (Port) + Delay;
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Ticks = IoBitFieldRead32 (Port, 0, 23) + Delay;
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Delay = BIT22;
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Delay = BIT22;
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//
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//
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// Wait until time out
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// Wait until time out
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// Delay >= 2^23 could not be handled by this function
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// Delay >= 2^23 could not be handled by this function
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// Timer wrap-arounds are handled correctly by this function
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// Timer wrap-arounds are handled correctly by this function
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//
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//
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while (((Ticks - IoRead32 (Port)) & BIT23) == 0) {
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while (((Ticks - IoBitFieldRead32 (Port, 0, 23)) & BIT23) == 0) {
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CpuPause ();
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CpuPause ();
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}
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}
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} while (Times-- > 0);
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} while (Times-- > 0);
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@ -371,7 +371,7 @@ InternalCalculateTscFrequency (
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// Use 363 * 9861 = 3579543 Hz which is within 2 Hz of ACPI_TIMER_FREQUENCY.
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// Use 363 * 9861 = 3579543 Hz which is within 2 Hz of ACPI_TIMER_FREQUENCY.
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// 363 counts is a calibration time of 101.4 uS.
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// 363 counts is a calibration time of 101.4 uS.
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//
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//
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Ticks = IoRead32 (TimerAddr) + 363;
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Ticks = IoBitFieldRead32 (TimerAddr, 0, 23) + 363;
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StartTSC = AsmReadTsc (); // Get base value for the TSC
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StartTSC = AsmReadTsc (); // Get base value for the TSC
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//
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//
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@ -380,7 +380,7 @@ InternalCalculateTscFrequency (
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// When the current ACPI timer value is greater than 'Ticks',
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// When the current ACPI timer value is greater than 'Ticks',
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// the while loop will exit.
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// the while loop will exit.
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//
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//
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while (((Ticks - IoRead32 (TimerAddr)) & BIT23) == 0) {
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while (((Ticks - IoBitFieldRead32 (TimerAddr, 0, 23)) & BIT23) == 0) {
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CpuPause();
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CpuPause();
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}
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}
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EndTSC = AsmReadTsc (); // TSC value 101.4 us later
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EndTSC = AsmReadTsc (); // TSC value 101.4 us later
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@ -4,7 +4,10 @@
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# Provides basic timer support using the ACPI timer hardware. The performance
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# Provides basic timer support using the ACPI timer hardware. The performance
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# counter features are provided by the processors time stamp counter.
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# counter features are provided by the processors time stamp counter.
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#
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#
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# Copyright (c) 2013 - 2015, Intel Corporation. All rights reserved.<BR>
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# Note: The implementation uses the lower 24-bits of the ACPI timer and
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# is compatible with both 24-bit and 32-bit ACPI timers.
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#
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# Copyright (c) 2013 - 2016, Intel Corporation. All rights reserved.<BR>
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# This program and the accompanying materials
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# This program and the accompanying materials
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# are licensed and made available under the terms and conditions of the BSD License
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# are licensed and made available under the terms and conditions of the BSD License
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# which accompanies this distribution. The full text of the license may be found at
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# which accompanies this distribution. The full text of the license may be found at
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@ -4,7 +4,10 @@
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# Provides basic timer support using the ACPI timer hardware. The performance
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# Provides basic timer support using the ACPI timer hardware. The performance
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# counter features are provided by the processors time stamp counter.
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# counter features are provided by the processors time stamp counter.
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#
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#
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# Copyright (c) 2013 - 2015, Intel Corporation. All rights reserved.<BR>
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# Note: The implementation uses the lower 24-bits of the ACPI timer and
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# is compatible with both 24-bit and 32-bit ACPI timers.
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#
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# Copyright (c) 2013 - 2016, Intel Corporation. All rights reserved.<BR>
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# This program and the accompanying materials
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# This program and the accompanying materials
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# are licensed and made available under the terms and conditions of the BSD License
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# are licensed and made available under the terms and conditions of the BSD License
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# which accompanies this distribution. The full text of the license may be found at
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# which accompanies this distribution. The full text of the license may be found at
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