/**
Enable/Disable the interrupt of debug timer and return the interrupt state
prior to the operation.
If EnableStatus is TRUE, enable the interrupt of debug timer.
If EnableStatus is FALSE, disable the interrupt of debug timer.
@param[in] EnableStatus Enable/Disable.
@retval TRUE Debug timer interrupt were enabled on entry to this call.
@retval FALSE Debug timer interrupt were disabled on entry to this call.
**/
BOOLEAN
EFIAPI
SaveAndSetDebugTimerInterrupt (
IN BOOLEAN EnableStatus
)
{
BOOLEAN OldDebugTimerInterruptState;
OldDebugTimerInterruptState = GetApicTimerInterruptState ();
if (OldDebugTimerInterruptState != EnableStatus) {
if (EnableStatus) {
EnableApicTimerInterrupt ();
} else {
DisableApicTimerInterrupt ();
}
//
// Validate the Debug Timer interrupt state
// This will make additional delay after Local Apic Timer interrupt state is changed.
// Thus, CPU could handle the potential pending interrupt of Local Apic timer.
//
while (GetApicTimerInterruptState () != EnableStatus) {
CpuPause ();
}
}
return OldDebugTimerInterruptState;
}
/**
Enable/Disable the interrupt of debug timer and return the interrupt state
prior to the operation.
If EnableStatus is TRUE, enable the interrupt of debug timer.
If EnableStatus is FALSE, disable the interrupt of debug timer.
@param[in] EnableStatus Enable/Disable.
@retval TRUE Debug timer interrupt were enabled on entry to this call.
@retval FALSE Debug timer interrupt were disabled on entry to this call.
**/
BOOLEAN
EFIAPI
SaveAndSetDebugTimerInterrupt (
IN BOOLEAN EnableStatus
)
{
BOOLEAN OldInterruptState;
BOOLEAN OldDebugTimerInterruptState;
OldInterruptState = SaveAndDisableInterrupts ();
OldDebugTimerInterruptState = GetApicTimerInterruptState ();
if (EnableStatus) {
EnableApicTimerInterrupt ();
} else {
DisableApicTimerInterrupt ();
}
SetInterruptState (OldInterruptState);
return OldDebugTimerInterruptState;
}