Re: [Qemu-devel] pci_change_irq_level is broken...

[Richard Henderson <rth@twiddle.net>]

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~