void __KernelReturnFromInterrupt()
{
DEBUG_LOG(CPU, "Left interrupt handler at %08x", currentMIPS->pc);
// This is what we just ran.
PendingInterrupt pend = pendingInterrupts.front();
pendingInterrupts.pop_front();
intrHandlers[pend.intr]->handleResult(pend);
inInterrupt = false;
// Restore context after running the interrupt.
intState.restore();
// All should now be back to normal, including PC.
// Alright, let's see if there's any more interrupts queued...
if (!__RunOnePendingInterrupt())
{
// Otherwise, we reschedule when dispatch was enabled, or switch back otherwise.
if (__KernelIsDispatchEnabled())
__KernelReSchedule("return from interrupt");
else
__KernelSwitchToThread(threadBeforeInterrupt, "return from interrupt");
}
}
// Returns true if anything was executed.
bool __RunOnePendingInterrupt()
{
bool needsThreadReturn = false;
if (inInterrupt || !interruptsEnabled) {
// Already in an interrupt! We'll keep going when it's done.
return false;
}
// Can easily prioritize between different kinds of interrupts if necessary.
retry:
if (!pendingInterrupts.empty()) {
PendingInterrupt pend = pendingInterrupts.front();
IntrHandler* handler = intrHandlers[pend.intr];
if (handler == NULL) {
WARN_LOG(SCEINTC, "Ignoring interrupt");
pendingInterrupts.pop_front();
goto retry;
}
// If we came from CoreTiming::Advance(), we might've come from a waiting thread's callback.
// To avoid "injecting" return values into our saved state, we context switch here.
SceUID savedThread = __KernelGetCurThread();
if (__KernelSwitchOffThread("interrupt")) {
threadBeforeInterrupt = savedThread;
needsThreadReturn = true;
}
intState.save();
inInterrupt = true;
if (!handler->run(pend)) {
pendingInterrupts.pop_front();
inInterrupt = false;
goto retry;
}
currentMIPS->r[MIPS_REG_RA] = __KernelInterruptReturnAddress();
return true;
} else {
if (needsThreadReturn)
__KernelSwitchToThread(threadBeforeInterrupt, "left interrupt");
// DEBUG_LOG(SCEINTC, "No more interrupts!");
return false;
}
}
