void Tima::setTac(unsigned const data, unsigned long const cc, TimaInterruptRequester timaIrq) {
if (tac_ ^ data) {
unsigned long nextIrqEventTime = timaIrq.nextIrqEventTime();
if (tac_ & 0x04) {
updateIrq(cc, timaIrq);
updateTima(cc);
// FIXME: this looks naive.
// TODO: more TIMA tests.
lastUpdate_ -= (1u << (timaClock[tac_ & 3] - 1)) + 3;
tmatime_ -= (1u << (timaClock[tac_ & 3] - 1)) + 3;
nextIrqEventTime -= (1u << (timaClock[tac_ & 3] - 1)) + 3;
if (cc >= nextIrqEventTime)
timaIrq.flagIrq();
updateTima(cc);
tmatime_ = disabled_time;
nextIrqEventTime = disabled_time;
}
if (data & 4) {
lastUpdate_ = (cc >> timaClock[data & 3]) << timaClock[data & 3];
nextIrqEventTime = lastUpdate_ + ((256u - tima_) << timaClock[data & 3]) + 3;
}
void Tima::setTac(const unsigned data, const unsigned long cycleCounter, const TimaInterruptRequester timaIrq) {
if (tac_ ^ data) {
unsigned long nextIrqEventTime = timaIrq.nextIrqEventTime();
if (tac_ & 0x04) {
updateIrq(cycleCounter, timaIrq);
updateTima(cycleCounter);
lastUpdate_ -= (1u << (timaClock[tac_ & 3] - 1)) + 3;
tmatime_ -= (1u << (timaClock[tac_ & 3] - 1)) + 3;
nextIrqEventTime -= (1u << (timaClock[tac_ & 3] - 1)) + 3;
if (cycleCounter >= nextIrqEventTime)
timaIrq.flagIrq();
updateTima(cycleCounter);
tmatime_ = DISABLED_TIME;
nextIrqEventTime = DISABLED_TIME;
}
if (data & 4) {
lastUpdate_ = (cycleCounter >> timaClock[data & 3]) << timaClock[data & 3];
nextIrqEventTime = lastUpdate_ + ((256u - tima_) << timaClock[data & 3]) + 3;
}
void Tima::resetCc(unsigned long const oldCc, unsigned long const newCc, TimaInterruptRequester timaIrq) {
if (tac_ & 0x04) {
updateIrq(oldCc, timaIrq);
updateTima(oldCc);
unsigned long const dec = oldCc - newCc;
lastUpdate_ -= dec;
timaIrq.setNextIrqEventTime(timaIrq.nextIrqEventTime() - dec);
if (tmatime_ != disabled_time)
tmatime_ -= dec;
}
}
void Tima::resetCc(const unsigned long oldCc, const unsigned long newCc, const TimaInterruptRequester timaIrq) {
const unsigned long dec = oldCc - newCc;
if (tac_ & 0x04) {
updateIrq(oldCc, timaIrq);
updateTima(oldCc);
lastUpdate_ -= dec;
timaIrq.setNextIrqEventTime(timaIrq.nextIrqEventTime() - dec);
if (tmatime_ != DISABLED_TIME)
tmatime_ -= dec;
}
}