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); }