void __init xen_init_IRQ(void)
{
int i;
init_evtchn_cpu_bindings();
/* No event channels are 'live' right now. */
for (i = 0; i < NR_EVENT_CHANNELS; i++)
mask_evtchn(i);
/* No IRQ -> event-channel mappings. */
for (i = 0; i < NR_IRQS; i++)
irq_info[i] = IRQ_UNBOUND;
/* Dynamic IRQ space is currently unbound. Zero the refcnts. */
for (i = 0; i < NR_DYNIRQS; i++) {
irq_bindcount[dynirq_to_irq(i)] = 0;
irq_desc[dynirq_to_irq(i)].status = IRQ_DISABLED;
irq_desc[dynirq_to_irq(i)].action = NULL;
irq_desc[dynirq_to_irq(i)].depth = 1;
irq_desc[dynirq_to_irq(i)].handler = &dynirq_type;
}
/* Phys IRQ space is statically bound (1:1 mapping). Nail refcnts. */
for (i = 0; i < NR_PIRQS; i++) {
irq_bindcount[pirq_to_irq(i)] = 1;
#ifdef RTC_IRQ
/* If not domain 0, force our RTC driver to fail its probe. */
if ((i == RTC_IRQ) &&
!is_initial_xendomain())
continue;
#endif
irq_desc[pirq_to_irq(i)].status = IRQ_DISABLED;
irq_desc[pirq_to_irq(i)].action = NULL;
irq_desc[pirq_to_irq(i)].depth = 1;
irq_desc[pirq_to_irq(i)].handler = &pirq_type;
}
}
static int
find_unbound_irq(void)
{
int dynirq, irq;
for (dynirq = 0; dynirq < NR_IRQS; dynirq++) {
irq = dynirq_to_irq(dynirq);
if (irq_bindcount[irq] == 0)
break;
}
if (irq == NR_IRQS)
panic("No available IRQ to bind to: increase NR_IRQS!\n");
return (irq);
}
