static void rtc_update_irq(RTCState *s)
{
ASSERT(spin_is_locked(&s->lock));
if ( rtc_mode_is(s, strict) && (s->hw.cmos_data[RTC_REG_C] & RTC_IRQF) )
return;
/* IRQ is raised if any source is both raised & enabled */
if ( !(s->hw.cmos_data[RTC_REG_B] &
s->hw.cmos_data[RTC_REG_C] &
(RTC_PF | RTC_AF | RTC_UF)) )
return;
s->hw.cmos_data[RTC_REG_C] |= RTC_IRQF;
if ( rtc_mode_is(s, no_ack) )
hvm_isa_irq_deassert(vrtc_domain(s), RTC_IRQ);
hvm_isa_irq_assert(vrtc_domain(s), RTC_IRQ);
}
static uint32_t rtc_ioport_read(RTCState *s, uint32_t addr)
{
int ret;
struct domain *d = vrtc_domain(s);
if ( (addr & 1) == 0 )
return 0xff;
spin_lock(&s->lock);
switch ( s->hw.cmos_index )
{
case RTC_SECONDS:
case RTC_MINUTES:
case RTC_HOURS:
case RTC_DAY_OF_WEEK:
case RTC_DAY_OF_MONTH:
case RTC_MONTH:
case RTC_YEAR:
/* if not in set mode, adjust cmos before reading*/
if (!(s->hw.cmos_data[RTC_REG_B] & RTC_SET))
{
s->current_tm = gmtime(get_localtime(d));
rtc_copy_date(s);
}
ret = s->hw.cmos_data[s->hw.cmos_index];
break;
case RTC_REG_A:
ret = s->hw.cmos_data[s->hw.cmos_index];
if ((s->use_timer == 0) && update_in_progress(s))
ret |= RTC_UIP;
break;
case RTC_REG_C:
ret = s->hw.cmos_data[s->hw.cmos_index];
s->hw.cmos_data[RTC_REG_C] = 0x00;
if ( (ret & RTC_IRQF) && !rtc_mode_is(s, no_ack) )
hvm_isa_irq_deassert(d, RTC_IRQ);
rtc_update_irq(s);
check_update_timer(s);
alarm_timer_update(s);
rtc_timer_update(s);
break;
default:
ret = s->hw.cmos_data[s->hw.cmos_index];
break;
}
spin_unlock(&s->lock);
return ret;
}
bool_t rtc_periodic_interrupt(void *opaque)
{
RTCState *s = opaque;
bool_t ret;
spin_lock(&s->lock);
ret = rtc_mode_is(s, no_ack) || !(s->hw.cmos_data[RTC_REG_C] & RTC_IRQF);
if ( rtc_mode_is(s, no_ack) || !(s->hw.cmos_data[RTC_REG_C] & RTC_PF) )
{
s->hw.cmos_data[RTC_REG_C] |= RTC_PF;
rtc_update_irq(s);
}
else if ( ++(s->pt_dead_ticks) >= 10 )
{
/* VM is ignoring its RTC; no point in running the timer */
destroy_periodic_time(&s->pt);
s->pt_code = 0;
}
if ( !(s->hw.cmos_data[RTC_REG_C] & RTC_IRQF) )
ret = 0;
spin_unlock(&s->lock);
return ret;
}
/* Called by the VPT code after it's injected a PF interrupt for us.
* Fix up the register state to reflect what happened. */
static void rtc_pf_callback(struct vcpu *v, void *opaque)
{
RTCState *s = opaque;
spin_lock(&s->lock);
if ( !rtc_mode_is(s, no_ack)
&& (s->hw.cmos_data[RTC_REG_C] & RTC_IRQF)
&& ++(s->pt_dead_ticks) >= 10 )
{
/* VM is ignoring its RTC; no point in running the timer */
TRACE_0D(TRC_HVM_EMUL_RTC_STOP_TIMER);
destroy_periodic_time(&s->pt);
s->period = 0;
}
s->hw.cmos_data[RTC_REG_C] |= RTC_PF|RTC_IRQF;
spin_unlock(&s->lock);
}
