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SourceLevelDebugPkg/DebugTimer: Fix the issue if CurrentTimer = Timer 

If CPU runs fast and timer runs slow, two GetApicTimerCurrentCount() may return
the same timer count value. We need to consider timer roll-over not happened.
Otherwise, one false timeout flag will be set.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff.fan@intel.com>
Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18328 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Jeff Fan 2015-08-27 02:05:20 +00:00 committed by vanjeff
parent 57a3e4f9b5
commit 3b9468ef28
1 changed files with 3 additions and 1 deletions
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4
SourceLevelDebugPkg/Library/DebugAgent/DebugAgentCommon/DebugTimer.c
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@ -131,8 +131,10 @@ IsDebugTimerTimeout (
// //
// This timer counter counts down. Check for roll over condition. // This timer counter counts down. Check for roll over condition.
// If CurrentTimer is equal to Timer, it does not mean that roll over
// happened.
// //
if (CurrentTimer < Timer) { if (CurrentTimer <= Timer) {
Delta = Timer - CurrentTimer; Delta = Timer - CurrentTimer;
} else { } else {
// //