Re: [Qemu-devel] [PATCH 6/6] use uint32_t for ioport port and value instead of int.

[Tristan Gingold]

On Jul 10, 2009, at 3:16 PM, Anthony Liguori wrote:

> Tristan Gingold wrote:
> > Yes.
> >
> > Port IO is done through usual memory access, but either the  
> > processor or the north-bridge can recognize this
> > address and convert the memory access to a port access.  After all  
> > PCI cards knows about IO vs Memory.
>
> So would we actually model this in QEMU through cpu_in/out?

Yes, as the cpu can generate port IO cycles for them.

> Can PCI IO regions that are marked as PIO actually be > 16-bit in  
> size?

yes: pci 2.2 6.2.5.1 allows this explicitely.