diff options
Diffstat (limited to 'hw/misc/mos6522.c')
| -rw-r--r-- | hw/misc/mos6522.c | 67 |
1 files changed, 52 insertions, 15 deletions
diff --git a/hw/misc/mos6522.c b/hw/misc/mos6522.c index 57f13db266..aa3bfe1afd 100644 --- a/hw/misc/mos6522.c +++ b/hw/misc/mos6522.c @@ -38,8 +38,10 @@ /* XXX: implement all timer modes */ -static void mos6522_timer_update(MOS6522State *s, MOS6522Timer *ti, - int64_t current_time); +static void mos6522_timer1_update(MOS6522State *s, MOS6522Timer *ti, + int64_t current_time); +static void mos6522_timer2_update(MOS6522State *s, MOS6522Timer *ti, + int64_t current_time); static void mos6522_update_irq(MOS6522State *s) { @@ -98,7 +100,11 @@ static void set_counter(MOS6522State *s, MOS6522Timer *ti, unsigned int val) trace_mos6522_set_counter(1 + ti->index, val); ti->load_time = get_load_time(s, ti); ti->counter_value = val; - mos6522_timer_update(s, ti, ti->load_time); + if (ti->index == 0) { + mos6522_timer1_update(s, ti, ti->load_time); + } else { + mos6522_timer2_update(s, ti, ti->load_time); + } } static int64_t get_next_irq_time(MOS6522State *s, MOS6522Timer *ti, @@ -130,19 +136,34 @@ static int64_t get_next_irq_time(MOS6522State *s, MOS6522Timer *ti, trace_mos6522_get_next_irq_time(ti->latch, d, next_time - d); next_time = muldiv64(next_time, NANOSECONDS_PER_SECOND, ti->frequency) + ti->load_time; + if (next_time <= current_time) { next_time = current_time + 1; } return next_time; } -static void mos6522_timer_update(MOS6522State *s, MOS6522Timer *ti, +static void mos6522_timer1_update(MOS6522State *s, MOS6522Timer *ti, + int64_t current_time) +{ + if (!ti->timer) { + return; + } + if ((s->ier & T1_INT) == 0 || (s->acr & T1MODE) != T1MODE_CONT) { + timer_del(ti->timer); + } else { + ti->next_irq_time = get_next_irq_time(s, ti, current_time); + timer_mod(ti->timer, ti->next_irq_time); + } +} + +static void mos6522_timer2_update(MOS6522State *s, MOS6522Timer *ti, int64_t current_time) { if (!ti->timer) { return; } - if (ti->index == 0 && (s->acr & T1MODE) != T1MODE_CONT) { + if ((s->ier & T2_INT) == 0) { timer_del(ti->timer); } else { ti->next_irq_time = get_next_irq_time(s, ti, current_time); @@ -155,7 +176,7 @@ static void mos6522_timer1(void *opaque) MOS6522State *s = opaque; MOS6522Timer *ti = &s->timers[0]; - mos6522_timer_update(s, ti, ti->next_irq_time); + mos6522_timer1_update(s, ti, ti->next_irq_time); s->ifr |= T1_INT; mos6522_update_irq(s); } @@ -165,7 +186,7 @@ static void mos6522_timer2(void *opaque) MOS6522State *s = opaque; MOS6522Timer *ti = &s->timers[1]; - mos6522_timer_update(s, ti, ti->next_irq_time); + mos6522_timer2_update(s, ti, ti->next_irq_time); s->ifr |= T2_INT; mos6522_update_irq(s); } @@ -204,7 +225,16 @@ uint64_t mos6522_read(void *opaque, hwaddr addr, unsigned size) { MOS6522State *s = opaque; uint32_t val; + int64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); + if (now >= s->timers[0].next_irq_time) { + mos6522_timer1_update(s, &s->timers[0], now); + s->ifr |= T1_INT; + } + if (now >= s->timers[1].next_irq_time) { + mos6522_timer2_update(s, &s->timers[1], now); + s->ifr |= T2_INT; + } switch (addr) { case VIA_REG_B: val = s->b; @@ -299,8 +329,8 @@ void mos6522_write(void *opaque, hwaddr addr, uint64_t val, unsigned size) break; case VIA_REG_T1CL: s->timers[0].latch = (s->timers[0].latch & 0xff00) | val; - mos6522_timer_update(s, &s->timers[0], - qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL)); + mos6522_timer1_update(s, &s->timers[0], + qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL)); break; case VIA_REG_T1CH: s->timers[0].latch = (s->timers[0].latch & 0xff) | (val << 8); @@ -309,14 +339,14 @@ void mos6522_write(void *opaque, hwaddr addr, uint64_t val, unsigned size) break; case VIA_REG_T1LL: s->timers[0].latch = (s->timers[0].latch & 0xff00) | val; - mos6522_timer_update(s, &s->timers[0], - qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL)); + mos6522_timer1_update(s, &s->timers[0], + qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL)); break; case VIA_REG_T1LH: s->timers[0].latch = (s->timers[0].latch & 0xff) | (val << 8); s->ifr &= ~T1_INT; - mos6522_timer_update(s, &s->timers[0], - qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL)); + mos6522_timer1_update(s, &s->timers[0], + qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL)); break; case VIA_REG_T2CL: s->timers[1].latch = (s->timers[1].latch & 0xff00) | val; @@ -334,8 +364,8 @@ void mos6522_write(void *opaque, hwaddr addr, uint64_t val, unsigned size) break; case VIA_REG_ACR: s->acr = val; - mos6522_timer_update(s, &s->timers[0], - qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL)); + mos6522_timer1_update(s, &s->timers[0], + qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL)); break; case VIA_REG_PCR: s->pcr = val; @@ -354,6 +384,11 @@ void mos6522_write(void *opaque, hwaddr addr, uint64_t val, unsigned size) s->ier &= ~val; } mos6522_update_irq(s); + /* if IER is modified starts needed timers */ + mos6522_timer1_update(s, &s->timers[0], + qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL)); + mos6522_timer2_update(s, &s->timers[1], + qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL)); break; default: case VIA_REG_ANH: @@ -426,9 +461,11 @@ static void mos6522_reset(DeviceState *dev) s->timers[0].frequency = s->frequency; s->timers[0].latch = 0xffff; set_counter(s, &s->timers[0], 0xffff); + timer_del(s->timers[0].timer); s->timers[1].frequency = s->frequency; s->timers[1].latch = 0xffff; + timer_del(s->timers[1].timer); } static void mos6522_init(Object *obj) |