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RTC: Update interrupt state when interrupts are masked/unmasked 

If an interrupt flag is already set when the interrupt becomes enabled,
raise an interrupt immediately, and vice versa if interrupts become
disabled.

Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Yang Zhang 2012-08-02 18:04:07 +02:00 committed by Anthony Liguori
parent e46deabaa5
commit 9324cc50c6
2 changed files with 10 additions and 0 deletions
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9
hw/mc146818rtc.c
View File

@ -221,6 +221,15 @@ static void cmos_ioport_write(void *opaque, uint32_t addr, uint32_t data)
rtc_set_time(s);
}
}
/* if an interrupt flag is already set when the interrupt
* becomes enabled, raise an interrupt immediately. */
if (data & s->cmos_data[RTC_REG_C] & REG_C_MASK) {
s->cmos_data[RTC_REG_C] |= REG_C_IRQF;
qemu_irq_raise(s->irq);
} else {
s->cmos_data[RTC_REG_C] &= ~REG_C_IRQF;
qemu_irq_lower(s->irq);
}
s->cmos_data[RTC_REG_B] = data;
periodic_timer_update(s, qemu_get_clock_ns(rtc_clock));
break;

1
hw/mc146818rtc_regs.h
View File

@ -58,5 +58,6 @@
#define REG_C_IRQF 0x80
#define REG_C_PF 0x40
#define REG_C_AF 0x20
#define REG_C_MASK 0x70
#endif