static void rtc_set_time(RTCState *s)
{
struct tm *tm = &s->current_tm;
struct domain *d = vrtc_domain(s);
unsigned long before, after; /* XXX s_time_t */
ASSERT(spin_is_locked(&s->lock));
before = mktime(get_year(tm->tm_year), tm->tm_mon + 1, tm->tm_mday,
tm->tm_hour, tm->tm_min, tm->tm_sec);
tm->tm_sec = from_bcd(s, s->hw.cmos_data[RTC_SECONDS]);
tm->tm_min = from_bcd(s, s->hw.cmos_data[RTC_MINUTES]);
tm->tm_hour = convert_hour(s, s->hw.cmos_data[RTC_HOURS]);
tm->tm_wday = from_bcd(s, s->hw.cmos_data[RTC_DAY_OF_WEEK]);
tm->tm_mday = from_bcd(s, s->hw.cmos_data[RTC_DAY_OF_MONTH]);
tm->tm_mon = from_bcd(s, s->hw.cmos_data[RTC_MONTH]) - 1;
tm->tm_year = from_bcd(s, s->hw.cmos_data[RTC_YEAR]) + 100;
after = mktime(get_year(tm->tm_year), tm->tm_mon + 1, tm->tm_mday,
tm->tm_hour, tm->tm_min, tm->tm_sec);
/* We use the guest's setting of the RTC to define the local-time
* offset for this domain. */
d->time_offset_seconds += (after - before);
update_domain_wallclock_time(d);
/* Also tell qemu-dm about it so it will be remembered for next boot. */
send_timeoffset_req(after - before);
}
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];
hvm_isa_irq_deassert(vrtc_domain(s), RTC_IRQ);
s->hw.cmos_data[RTC_REG_C] = 0x00;
check_update_timer(s);
break;
default:
ret = s->hw.cmos_data[s->hw.cmos_index];
break;
}
spin_unlock(&s->lock);
return ret;
}
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 int update_in_progress(RTCState *s)
{
uint64_t guest_usec;
struct domain *d = vrtc_domain(s);
if (s->hw.cmos_data[RTC_REG_B] & RTC_SET)
return 0;
guest_usec = get_localtime_us(d);
/* UIP bit will be set at last 244us of every second. */
if ((guest_usec % USEC_PER_SEC) >= (USEC_PER_SEC - 244))
return 1;
return 0;
}
/* handle update-ended timer */
static void check_update_timer(RTCState *s)
{
uint64_t next_update_time, expire_time;
uint64_t guest_usec;
struct domain *d = vrtc_domain(s);
stop_timer(&s->update_timer);
stop_timer(&s->update_timer2);
ASSERT(spin_is_locked(&s->lock));
if (!(s->hw.cmos_data[RTC_REG_C] & RTC_UF) &&
!(s->hw.cmos_data[RTC_REG_B] & RTC_SET))
{
s->use_timer = 1;
guest_usec = get_localtime_us(d) % USEC_PER_SEC;
if (guest_usec >= (USEC_PER_SEC - 244))
{
/* RTC is in update cycle */
s->hw.cmos_data[RTC_REG_A] |= RTC_UIP;
next_update_time = (USEC_PER_SEC - guest_usec) * NS_PER_USEC;
expire_time = NOW() + next_update_time;
/* release lock before set timer */
spin_unlock(&s->lock);
set_timer(&s->update_timer2, expire_time);
/* fetch lock again */
spin_lock(&s->lock);
}
else
{
next_update_time = (USEC_PER_SEC - guest_usec - 244) * NS_PER_USEC;
expire_time = NOW() + next_update_time;
s->next_update_time = expire_time;
/* release lock before set timer */
spin_unlock(&s->lock);
set_timer(&s->update_timer, expire_time);
/* fetch lock again */
spin_lock(&s->lock);
}
}
else
s->use_timer = 0;
}
static void rtc_update_irq(RTCState *s)
{
struct domain *d = vrtc_domain(s);
uint8_t irqf;
ASSERT(spin_is_locked(&s->lock));
/* IRQ is raised if any source is both raised & enabled */
irqf = (s->hw.cmos_data[RTC_REG_B]
& s->hw.cmos_data[RTC_REG_C]
& (RTC_PF|RTC_AF|RTC_UF))
? RTC_IRQF : 0;
s->hw.cmos_data[RTC_REG_C] &= ~RTC_IRQF;
s->hw.cmos_data[RTC_REG_C] |= irqf;
hvm_isa_irq_deassert(d, RTC_IRQ);
if ( irqf )
hvm_isa_irq_assert(d, RTC_IRQ);
}
static void rtc_alarm_cb(void *opaque)
{
RTCState *s = opaque;
struct domain *d = vrtc_domain(s);
spin_lock(&s->lock);
if (!(s->hw.cmos_data[RTC_REG_B] & RTC_SET))
{
s->hw.cmos_data[RTC_REG_C] |= RTC_AF;
/* alarm interrupt */
if (s->hw.cmos_data[RTC_REG_B] & RTC_AIE)
{
s->hw.cmos_data[RTC_REG_C] |= RTC_IRQF;
hvm_isa_irq_deassert(d, RTC_IRQ);
hvm_isa_irq_assert(d, RTC_IRQ);
}
alarm_timer_update(s);
}
spin_unlock(&s->lock);
}
static void rtc_update_timer2(void *opaque)
{
RTCState *s = opaque;
struct domain *d = vrtc_domain(s);
spin_lock(&s->lock);
if (!(s->hw.cmos_data[RTC_REG_B] & RTC_SET))
{
s->hw.cmos_data[RTC_REG_C] |= RTC_UF;
s->hw.cmos_data[RTC_REG_A] &= ~RTC_UIP;
if ((s->hw.cmos_data[RTC_REG_B] & RTC_UIE))
{
s->hw.cmos_data[RTC_REG_C] |= RTC_IRQF;
hvm_isa_irq_deassert(d, RTC_IRQ);
hvm_isa_irq_assert(d, RTC_IRQ);
}
check_update_timer(s);
}
spin_unlock(&s->lock);
}
static int rtc_ioport_write(void *opaque, uint32_t addr, uint32_t data)
{
RTCState *s = opaque;
struct domain *d = vrtc_domain(s);
uint32_t orig;
spin_lock(&s->lock);
if ( (addr & 1) == 0 )
{
data &= 0x7f;
s->hw.cmos_index = data;
spin_unlock(&s->lock);
return (data < RTC_CMOS_SIZE);
}
if ( s->hw.cmos_index >= RTC_CMOS_SIZE )
{
spin_unlock(&s->lock);
return 0;
}
orig = s->hw.cmos_data[s->hw.cmos_index];
switch ( s->hw.cmos_index )
{
case RTC_SECONDS_ALARM:
case RTC_MINUTES_ALARM:
case RTC_HOURS_ALARM:
s->hw.cmos_data[s->hw.cmos_index] = data;
alarm_timer_update(s);
break;
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 in set mode, just write the register */
if ( (s->hw.cmos_data[RTC_REG_B] & RTC_SET) )
s->hw.cmos_data[s->hw.cmos_index] = data;
else
{
/* Fetch the current time and update just this field. */
s->current_tm = gmtime(get_localtime(d));
rtc_copy_date(s);
s->hw.cmos_data[s->hw.cmos_index] = data;
rtc_set_time(s);
}
alarm_timer_update(s);
break;
case RTC_REG_A:
/* UIP bit is read only */
s->hw.cmos_data[RTC_REG_A] = (data & ~RTC_UIP) | (orig & RTC_UIP);
if ( (data ^ orig) & ~RTC_UIP )
rtc_timer_update(s);
break;
case RTC_REG_B:
if ( data & RTC_SET )
{
/* set mode: reset UIP mode */
s->hw.cmos_data[RTC_REG_A] &= ~RTC_UIP;
/* adjust cmos before stopping */
if (!(orig & RTC_SET))
{
s->current_tm = gmtime(get_localtime(d));
rtc_copy_date(s);
}
}
else
{
/* if disabling set mode, update the time */
if ( orig & RTC_SET )
rtc_set_time(s);
}
check_for_pf_ticks(s);
s->hw.cmos_data[RTC_REG_B] = data;
/*
* If the interrupt is already set when the interrupt becomes
* enabled, raise an interrupt immediately.
*/
rtc_update_irq(s);
if ( (data ^ orig) & RTC_PIE )
{
TRACE_0D(TRC_HVM_EMUL_RTC_STOP_TIMER);
destroy_periodic_time(&s->pt);
s->period = 0;
rtc_timer_update(s);
}
if ( (data ^ orig) & RTC_SET )
check_update_timer(s);
if ( (data ^ orig) & (RTC_24H | RTC_DM_BINARY | RTC_SET) )
alarm_timer_update(s);
break;
case RTC_REG_C:
case RTC_REG_D:
/* cannot write to them */
break;
}
spin_unlock(&s->lock);
return 1;
}
/* handle alarm timer */
static void alarm_timer_update(RTCState *s)
{
uint64_t next_update_time, next_alarm_sec;
uint64_t expire_time;
int32_t alarm_sec, alarm_min, alarm_hour, cur_hour, cur_min, cur_sec;
int32_t hour, min;
struct domain *d = vrtc_domain(s);
ASSERT(spin_is_locked(&s->lock));
stop_timer(&s->alarm_timer);
if (!(s->hw.cmos_data[RTC_REG_C] & RTC_AF) &&
!(s->hw.cmos_data[RTC_REG_B] & RTC_SET))
{
s->current_tm = gmtime(get_localtime(d));
rtc_copy_date(s);
alarm_sec = from_bcd(s, s->hw.cmos_data[RTC_SECONDS_ALARM]);
alarm_min = from_bcd(s, s->hw.cmos_data[RTC_MINUTES_ALARM]);
alarm_hour = convert_hour(s, s->hw.cmos_data[RTC_HOURS_ALARM]);
cur_sec = from_bcd(s, s->hw.cmos_data[RTC_SECONDS]);
cur_min = from_bcd(s, s->hw.cmos_data[RTC_MINUTES]);
cur_hour = convert_hour(s, s->hw.cmos_data[RTC_HOURS]);
next_update_time = USEC_PER_SEC - (get_localtime_us(d) % USEC_PER_SEC);
next_update_time = next_update_time * NS_PER_USEC + NOW();
if ((s->hw.cmos_data[RTC_HOURS_ALARM] & 0xc0) == 0xc0)
{
if ((s->hw.cmos_data[RTC_MINUTES_ALARM] & 0xc0) == 0xc0)
{
if ((s->hw.cmos_data[RTC_SECONDS_ALARM] & 0xc0) == 0xc0)
next_alarm_sec = 1;
else if (cur_sec < alarm_sec)
next_alarm_sec = alarm_sec - cur_sec;
else
next_alarm_sec = alarm_sec + SEC_PER_MIN - cur_sec;
}
else
{
if (cur_min < alarm_min)
{
min = alarm_min - cur_min;
next_alarm_sec = min * SEC_PER_MIN - cur_sec;
if ((s->hw.cmos_data[RTC_SECONDS_ALARM] & 0xc0) == 0xc0)
next_alarm_sec += 0;
else
next_alarm_sec += alarm_sec;
}
else if (cur_min == alarm_min)
{
if ((s->hw.cmos_data[RTC_SECONDS_ALARM] & 0xc0) == 0xc0)
next_alarm_sec = 1;
else if (cur_sec < alarm_sec)
next_alarm_sec = alarm_sec - cur_sec;
else
{
min = alarm_min + MIN_PER_HOUR - cur_min;
next_alarm_sec =
alarm_sec + min * SEC_PER_MIN - cur_sec;
}
}
else
{
min = alarm_min + MIN_PER_HOUR - cur_min;
next_alarm_sec = min * SEC_PER_MIN - cur_sec;
if ((s->hw.cmos_data[RTC_SECONDS_ALARM] & 0xc0) == 0xc0)
next_alarm_sec += 0;
else
next_alarm_sec += alarm_sec;
}
}
}
else
{
if (cur_hour < alarm_hour)
{
hour = alarm_hour - cur_hour;
next_alarm_sec = hour * SEC_PER_HOUR -
cur_min * SEC_PER_MIN - cur_sec;
if ((s->hw.cmos_data[RTC_MINUTES_ALARM] & 0xc0) == 0xc0)
{
if ((s->hw.cmos_data[RTC_SECONDS_ALARM] & 0xc0) == 0xc0)
next_alarm_sec += 0;
else
next_alarm_sec += alarm_sec;
}
else
{
next_alarm_sec += alarm_min * SEC_PER_MIN;
if ((s->hw.cmos_data[RTC_SECONDS_ALARM] & 0xc0) == 0xc0)
next_alarm_sec += 0;
else
next_alarm_sec += alarm_sec;
}
}
else if (cur_hour == alarm_hour)
{
if ((s->hw.cmos_data[RTC_MINUTES_ALARM] & 0xc0) == 0xc0)
{
if ((s->hw.cmos_data[RTC_SECONDS_ALARM] & 0xc0) == 0xc0)
next_alarm_sec = 1;
else if (cur_sec < alarm_sec)
next_alarm_sec = alarm_sec - cur_sec;
else
next_alarm_sec = alarm_sec + SEC_PER_MIN - cur_sec;
}
else if (cur_min < alarm_min)
{
min = alarm_min - cur_min;
next_alarm_sec = min * SEC_PER_MIN - cur_sec;
if ((s->hw.cmos_data[RTC_SECONDS_ALARM] & 0xc0) == 0xc0)
next_alarm_sec += 0;
else
next_alarm_sec += alarm_sec;
}
else if (cur_min == alarm_min)
{
if ((s->hw.cmos_data[RTC_SECONDS_ALARM] & 0xc0) == 0xc0)
next_alarm_sec = 1;
else if (cur_sec < alarm_sec)
next_alarm_sec = alarm_sec - cur_sec;
else
{
hour = alarm_hour + HOUR_PER_DAY - cur_hour;
next_alarm_sec = hour * SEC_PER_HOUR -
cur_min * SEC_PER_MIN - cur_sec;
next_alarm_sec += alarm_min * SEC_PER_MIN + alarm_sec;
}
}
else
{
hour = alarm_hour + HOUR_PER_DAY - cur_hour;
next_alarm_sec = hour * SEC_PER_HOUR -
cur_min * SEC_PER_MIN - cur_sec;
next_alarm_sec += alarm_min * SEC_PER_MIN;
if ((s->hw.cmos_data[RTC_SECONDS_ALARM] & 0xc0) == 0xc0)
next_alarm_sec += 0;
else
next_alarm_sec += alarm_sec;
}
}
else
{
hour = alarm_hour + HOUR_PER_DAY - cur_hour;
next_alarm_sec = hour * SEC_PER_HOUR -
cur_min * SEC_PER_MIN - cur_sec;
if ((s->hw.cmos_data[RTC_MINUTES_ALARM] & 0xc0) == 0xc0)
{
if ((s->hw.cmos_data[RTC_SECONDS_ALARM] & 0xc0) == 0xc0)
next_alarm_sec += 0;
else
next_alarm_sec += alarm_sec;
}
else
{
next_alarm_sec += alarm_min * SEC_PER_MIN;
if ((s->hw.cmos_data[RTC_SECONDS_ALARM] & 0xc0) == 0xc0)
next_alarm_sec += 0;
else
next_alarm_sec += alarm_sec;
}
}
}
expire_time = (next_alarm_sec - 1) * NS_PER_SEC + next_update_time;
/* release lock before set timer */
spin_unlock(&s->lock);
set_timer(&s->alarm_timer, expire_time);
/* fetch lock again */
spin_lock(&s->lock);
}
}
static int rtc_ioport_write(void *opaque, uint32_t addr, uint32_t data)
{
RTCState *s = opaque;
struct domain *d = vrtc_domain(s);
uint32_t orig;
spin_lock(&s->lock);
if ( (addr & 1) == 0 )
{
data &= 0x7f;
s->hw.cmos_index = data;
spin_unlock(&s->lock);
return (data < RTC_CMOS_SIZE);
}
if ( s->hw.cmos_index >= RTC_CMOS_SIZE )
{
spin_unlock(&s->lock);
return 0;
}
orig = s->hw.cmos_data[s->hw.cmos_index];
switch ( s->hw.cmos_index )
{
case RTC_SECONDS_ALARM:
case RTC_MINUTES_ALARM:
case RTC_HOURS_ALARM:
s->hw.cmos_data[s->hw.cmos_index] = data;
alarm_timer_update(s);
break;
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:
s->hw.cmos_data[s->hw.cmos_index] = data;
/* if in set mode, do not update the time */
if ( !(s->hw.cmos_data[RTC_REG_B] & RTC_SET) )
rtc_set_time(s);
alarm_timer_update(s);
break;
case RTC_REG_A:
/* UIP bit is read only */
s->hw.cmos_data[RTC_REG_A] = (data & ~RTC_UIP) | (orig & RTC_UIP);
if ( (data ^ orig) & ~RTC_UIP )
rtc_timer_update(s);
break;
case RTC_REG_B:
if ( data & RTC_SET )
{
/* set mode: reset UIP mode */
s->hw.cmos_data[RTC_REG_A] &= ~RTC_UIP;
/* adjust cmos before stopping */
if (!(s->hw.cmos_data[RTC_REG_B] & RTC_SET))
{
s->current_tm = gmtime(get_localtime(d));
rtc_copy_date(s);
}
}
else
{
/* if disabling set mode, update the time */
if ( s->hw.cmos_data[RTC_REG_B] & RTC_SET )
rtc_set_time(s);
}
/* if the interrupt is already set when the interrupt become
* enabled, raise an interrupt immediately*/
if ((data & RTC_UIE) && !(s->hw.cmos_data[RTC_REG_B] & RTC_UIE))
if (s->hw.cmos_data[RTC_REG_C] & RTC_UF)
{
hvm_isa_irq_deassert(d, RTC_IRQ);
hvm_isa_irq_assert(d, RTC_IRQ);
}
s->hw.cmos_data[RTC_REG_B] = data;
if ( (data ^ orig) & RTC_PIE )
rtc_timer_update(s);
check_update_timer(s);
alarm_timer_update(s);
break;
case RTC_REG_C:
case RTC_REG_D:
/* cannot write to them */
break;
}
spin_unlock(&s->lock);
return 1;
}
