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Create a MAX_TIMER_TICK_DURATION for the error handling in 8254 timer module.
Signed-off-by: Li Elvin <elvin.li@intel.com> Reviewed-by: Tian Hot <hot.tian@intel.com> Reviewed-by: Zeng Star <star.zeng@intel.com> git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13884 6f19259b-4bc3-4df7-8a09-765794883524
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@ -1,7 +1,7 @@
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/** @file
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/** @file
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Timer Architectural Protocol as defined in the DXE CIS
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Timer Architectural Protocol as defined in the DXE CIS
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Copyright (c) 2005 - 2010, Intel Corporation. All rights reserved.<BR>
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Copyright (c) 2005 - 2012, 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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@ -219,9 +219,7 @@ TimerDriverSetTimerPeriod (
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//
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//
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if (TimerCount >= 65536) {
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if (TimerCount >= 65536) {
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TimerCount = 0;
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TimerCount = 0;
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if (TimerPeriod >= DEFAULT_TIMER_TICK_DURATION) {
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TimerPeriod = MAX_TIMER_TICK_DURATION;
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TimerPeriod = DEFAULT_TIMER_TICK_DURATION;
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}
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}
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}
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//
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//
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// Program the 8254 timer with the new count value
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// Program the 8254 timer with the new count value
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@ -1,7 +1,7 @@
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/** @file
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/** @file
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Private data structures
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Private data structures
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Copyright (c) 2005 - 2010, Intel Corporation. All rights reserved.<BR>
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Copyright (c) 2005 - 2012, 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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@ -34,6 +34,12 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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// ---------------- * 1,000,000 uS/S = 54925.4 uS = 549254 * 100 ns
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// ---------------- * 1,000,000 uS/S = 54925.4 uS = 549254 * 100 ns
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// 1,193,182 Hz
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// 1,193,182 Hz
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//
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//
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//
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// The maximum tick duration for 8254 timer
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//
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#define MAX_TIMER_TICK_DURATION 549254
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//
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// The default timer tick duration is set to 10 ms = 100000 100 ns units
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// The default timer tick duration is set to 10 ms = 100000 100 ns units
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//
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//
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#define DEFAULT_TIMER_TICK_DURATION 100000
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#define DEFAULT_TIMER_TICK_DURATION 100000
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