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thermosphere: refactor exception handlers & add stolen time/emulated ptimer logic

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This commit is contained in:
TuxSH 2020-01-08 22:18:56 +00:00
parent b9d07fccd6
commit 501472324f
9 changed files with 151 additions and 118 deletions
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21
thermosphere/src/irq.c
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@ -131,6 +131,22 @@ void initIrq(void)
recursiveSpinlockUnlockRestoreIrq(&g_irqManager.lock, flags);
}
static inline bool checkRescheduleEmulatedPtimer(ExceptionStackFrame *frame)
{
// Evaluate if the timer really has expired in the PoV of the guest kernel. If not, reschedule (add missed time delta) it & exit early
u64 cval = GET_SYSREG(cntp_cval_el0);
if (cval > frame->cntvct_el0) {
// It has not: reschedule the timer
u64 offsetNow = GET_SYSREG(cntvoff_el2);
SET_SYSREG(cntp_cval_el0, cval + (offsetNow - currentCoreCtx->emulPtimerOffsetThen));
currentCoreCtx->emulPtimerOffsetThen = offsetNow;
return false;
}
return true;
}
void handleIrqException(ExceptionStackFrame *frame, bool isLowerEl, bool isA32)
{
(void)isLowerEl;
@ -147,6 +163,11 @@ void handleIrqException(ExceptionStackFrame *frame, bool isLowerEl, bool isA32)
if (irqId == GIC_IRQID_SPURIOUS) {
// Spurious interrupt received
return;
} else if (irqId == GIC_IRQID_NS_PHYS_TIMER && !checkRescheduleEmulatedPtimer(frame)) {
// Deactivate the ptimer interrupt, return early
gicc->eoir = iar;
gicc->dir = iar;
return;
}
bool isGuestInterrupt = false;