using namespace std;
-Intel8254Timer::Intel8254Timer(const string &name)
- : _name(name), counter0(name + ".counter0"), counter1(name + ".counter1"),
- counter2(name + ".counter2")
+Intel8254Timer::Intel8254Timer(EventManager *em, const string &name,
+ Counter *counter0, Counter *counter1, Counter *counter2) :
+ EventManager(em), _name(name)
{
- counter[0] = &counter0;
- counter[1] = &counter0;
- counter[2] = &counter0;
+ counter[0] = counter0;
+ counter[1] = counter1;
+ counter[2] = counter2;
+}
+
+Intel8254Timer::Intel8254Timer(EventManager *em, const string &name) :
+ EventManager(em), _name(name)
+{
+ counter[0] = new Counter(this, name + ".counter0", 0);
+ counter[1] = new Counter(this, name + ".counter1", 1);
+ counter[2] = new Counter(this, name + ".counter2", 2);
}
void
Intel8254Timer::serialize(const string &base, ostream &os)
{
// serialize the counters
- counter0.serialize(base + ".counter0", os);
- counter1.serialize(base + ".counter1", os);
- counter2.serialize(base + ".counter2", os);
+ counter[0]->serialize(base + ".counter0", os);
+ counter[1]->serialize(base + ".counter1", os);
+ counter[2]->serialize(base + ".counter2", os);
}
void
const string §ion)
{
// unserialze the counters
- counter0.unserialize(base + ".counter0", cp, section);
- counter1.unserialize(base + ".counter1", cp, section);
- counter2.unserialize(base + ".counter2", cp, section);
+ counter[0]->unserialize(base + ".counter0", cp, section);
+ counter[1]->unserialize(base + ".counter1", cp, section);
+ counter[2]->unserialize(base + ".counter2", cp, section);
}
-Intel8254Timer::Counter::Counter(const string &name)
- : _name(name), event(this), count(0), latched_count(0), period(0),
- mode(0), output_high(false), latch_on(false), read_byte(LSB),
- write_byte(LSB)
+Intel8254Timer::Counter::Counter(Intel8254Timer *p,
+ const string &name, unsigned int _num)
+ : _name(name), num(_num), event(this), count(0),
+ latched_count(0), period(0), mode(0), output_high(false),
+ latch_on(false), read_byte(LSB), write_byte(LSB), parent(p)
{
}
count = (count & 0xFF00) | data;
if (event.scheduled())
- event.deschedule();
+ parent->deschedule(event);
output_high = false;
write_byte = MSB;
break;
case MSB:
count = (count & 0x00FF) | (data << 8);
- period = count;
+ // In the RateGen or SquareWave modes, the timer wraps around and
+ // triggers on a value of 1, not 0.
+ if (mode == RateGen || mode == SquareWave)
+ period = count - 1;
+ else
+ period = count;
+
+ if (period > 0)
+ event.setTo(period);
- if (period > 0) {
- DPRINTF(Intel8254Timer, "Timer set to curTick + %d\n",
- count * event.interval);
- event.schedule(curTick + count * event.interval);
- }
write_byte = LSB;
break;
}
Tick event_tick;
paramIn(cp, section, base + ".event_tick", event_tick);
if (event_tick)
- event.schedule(event_tick);
+ parent->schedule(event, event_tick);
}
Intel8254Timer::Counter::CounterEvent::CounterEvent(Counter* c_ptr)
- : Event(&mainEventQueue)
{
interval = (Tick)(Clock::Float::s / 1193180.0);
counter = c_ptr;
void
Intel8254Timer::Counter::CounterEvent::process()
{
- DPRINTF(Intel8254Timer, "Timer Interrupt\n");
switch (counter->mode) {
case InitTc:
counter->output_high = true;
+ break;
case RateGen:
case SquareWave:
+ setTo(counter->period);
break;
default:
panic("Unimplemented PITimer mode.\n");
}
+ counter->parent->counterInterrupt(counter->num);
+}
+
+void
+Intel8254Timer::Counter::CounterEvent::setTo(int clocks)
+{
+ if (clocks == 0)
+ panic("Timer can't be set to go off instantly.\n");
+ DPRINTF(Intel8254Timer, "Timer set to curTick + %d\n",
+ clocks * interval);
+ counter->parent->schedule(this, curTick + clocks * interval);
}
const char *
Intel8254Timer::Counter::CounterEvent::description() const
{
- return "tsunami 8254 Interval timer";
+ return "Intel 8254 Interval timer";
}