On 09/20/2011 12:19 PM, Alan Amaral wrote:
> QEMU emulator version 0.14.50, Copyright (c) 2003-2008 Fabrice Bellard
> You are correct, it's not hardcoded to 4. However, when it's allocated the
> number of elements IS 4. Also,
> there's a comment just above pci_set_irq which says:
>
> /* 0 <= irq_num <= 3. level must be 0 or 1 */
> static void pci_set_irq(void *opaque, int irq_num, int level)
> so, that implies to me that it's probably always 4...
The first use I examined was apb_pci.c:
d->bus = pci_register_bus(&d->busdev.qdev, "pci",
pci_apb_set_irq, pci_pbm_map_irq, d,
&d->pci_mmio,
get_system_io(),
0, 32);
where the last argument indicates that we allocate 32 irqs,
and the pci_pbm_map_irq function returns a value in the set
{ 0, 1, 2, 3, 16, 17, 18, 19 }.
r~
