update_irq() uses a similar method as in 'rtc_td_hack' to detect
coalesced interrupts. The function entry addresses are retrieved
from 'target_get_irq_delivered' and 'target_reset_irq_delivered'.
This change can be replaced if a generic feedback infrastructure to
track coalesced IRQs for periodic, clock providing devices becomes
available.
Signed-off-by: Ulrich Obergfell <uober...@redhat.com>
---
hw/hpet.c | 13 +++++++++++--
1 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/hw/hpet.c b/hw/hpet.c
index dba9370..0428290 100644
--- a/hw/hpet.c
+++ b/hw/hpet.c
@@ -184,11 +184,12 @@ static inline uint64_t hpet_calculate_diff(HPETTimer *t,
uint64_t current)
}
}
-static void update_irq(struct HPETTimer *timer, int set)
+static int update_irq(struct HPETTimer *timer, int set)
{
uint64_t mask;
HPETState *s;
int route;
+ int irq_delivered = 1;
if (timer->tn <= 1 && hpet_in_legacy_mode(timer->state)) {
/* if LegacyReplacementRoute bit is set, HPET specification requires
@@ -213,8 +214,16 @@ static void update_irq(struct HPETTimer *timer, int set)
qemu_irq_raise(s->irqs[route]);
} else {
s->isr &= ~mask;
- qemu_irq_pulse(s->irqs[route]);
+ if (s->driftfix) {
+ target_reset_irq_delivered();
+ qemu_irq_raise(s->irqs[route]);
+ irq_delivered = target_get_irq_delivered();
+ qemu_irq_lower(s->irqs[route]);
+ } else {
+ qemu_irq_pulse(s->irqs[route]);
+ }
}
+ return irq_delivered;
}
static void hpet_pre_save(void *opaque)
--
1.6.2.5
