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Add generic HPET Timer DXE Driver and support libraries. 

Minor update to logic to prevent writing a the read-only MSI Capability bit with 0 when HPET supports MSIs

Signed-off-by: mdkinney
Reviewed-by: li-elvin

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12272 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
mdkinney 2011-09-02 15:30:54 +00:00
parent 5025be3fc1
commit 0cdda8d6f0
1 changed files with 3 additions and 4 deletions
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7
PcAtChipsetPkg/HpetTimerDxe/HpetTimer.c
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@ -440,7 +440,7 @@ TimerDriverSetTimerPeriod (
// If TimerPeriod is 0, then mask HPET Timer interrupts
//
if (mTimerConfiguration.Bits.MsiInterruptCapablity != 0) {
if (mTimerConfiguration.Bits.MsiInterruptCapablity != 0 && FeaturePcdGet (PcdHpetMsiEnable)) {
//
// Disable HPET MSI interrupt generation
//
@ -498,7 +498,7 @@ TimerDriverSetTimerPeriod (
//
// Enable HPET Timer interrupt generation
//
if (mTimerConfiguration.Bits.MsiInterruptCapablity != 0) {
if (mTimerConfiguration.Bits.MsiInterruptCapablity != 0 && FeaturePcdGet (PcdHpetMsiEnable)) {
//
// Enable HPET MSI Interrupt
//
@ -789,7 +789,6 @@ TimerDriverInitialize (
// Set InterruptRoute field based in mTimerIrq
//
mTimerConfiguration.Uint64 = HpetRead (HPET_TIMER_CONFIGURATION_OFFSET + mTimerIndex * HPET_TIMER_STRIDE);
mTimerConfiguration.Bits.MsiInterruptCapablity = 0;
mTimerConfiguration.Bits.LevelTriggeredInterrupt = 1;
mTimerConfiguration.Bits.InterruptRoute = mTimerIrq;
}
@ -829,7 +828,7 @@ TimerDriverInitialize (
// Show state of enabled HPET timer
//
DEBUG_CODE (
if (mTimerConfiguration.Bits.MsiInterruptCapablity != 0) {
if (mTimerConfiguration.Bits.MsiInterruptCapablity != 0 && FeaturePcdGet (PcdHpetMsiEnable)) {
DEBUG ((DEBUG_INFO, "HPET Interrupt Mode MSI\n"));
} else {
DEBUG ((DEBUG_INFO, "HPET Interrupt Mode I/O APIC\n"));