int
pirq_alloc_pin(struct pci_devinst *pi)
{
struct vmctx *ctx = pi->pi_vmctx;
int best_count, best_irq, best_pin, irq, pin;
pirq_cold = 0;
if (lpc_bootrom()) {
/* For external bootrom use fixed mapping. */
best_pin = (4 + pi->pi_slot + pi->pi_lintr.pin) % 8;
} else {
/* Find the least-used PIRQ pin. */
best_pin = 0;
best_count = pirqs[0].use_count;
for (pin = 1; pin < nitems(pirqs); pin++) {
if (pirqs[pin].use_count < best_count) {
best_pin = pin;
best_count = pirqs[pin].use_count;
}
}
}
pirqs[best_pin].use_count++;
/* Second, route this pin to an IRQ. */
if (pirqs[best_pin].reg == PIRQ_DIS) {
best_irq = -1;
best_count = 0;
for (irq = 0; irq < nitems(irq_counts); irq++) {
if (irq_counts[irq] == IRQ_DISABLED)
continue;
if (best_irq == -1 || irq_counts[irq] < best_count) {
best_irq = irq;
best_count = irq_counts[irq];
}
}
assert(best_irq >= 0);
irq_counts[best_irq]++;
pirqs[best_pin].reg = best_irq;
vm_isa_set_irq_trigger(ctx, best_irq, LEVEL_TRIGGER);
}
return (best_pin + 1);
}
int
pirq_alloc_pin(struct vmctx *ctx)
{
int best_count, best_irq, best_pin, irq, pin;
pirq_cold = 0;
/* First, find the least-used PIRQ pin. */
best_pin = 0;
best_count = pirqs[0].use_count;
for (pin = 1; pin < nitems(pirqs); pin++) {
if (pirqs[pin].use_count < best_count) {
best_pin = pin;
best_count = pirqs[pin].use_count;
}
}
pirqs[best_pin].use_count++;
/* Second, route this pin to an IRQ. */
if (pirqs[best_pin].reg == PIRQ_DIS) {
best_irq = -1;
best_count = 0;
for (irq = 0; irq < nitems(irq_counts); irq++) {
if (irq_counts[irq] == IRQ_DISABLED)
continue;
if (best_irq == -1 || irq_counts[irq] < best_count) {
best_irq = irq;
best_count = irq_counts[irq];
}
}
assert(best_irq >= 0);
irq_counts[best_irq]++;
pirqs[best_pin].reg = best_irq;
vm_isa_set_irq_trigger(ctx, best_irq, LEVEL_TRIGGER);
}
return (best_pin + 1);
}
