Re: [Qemu-devel] [RFC v5 86/86] 440fx: fix PAM, PCI holes

Gleb Natapov
2011-07-25T13:17:32Z

On Mon, Jul 25, 2011 at 04:14:45PM +0300, Avi Kivity wrote:
> On 07/25/2011 04:07 PM, Anthony Liguori wrote:
> >On 07/20/2011 11:50 AM, Avi Kivity wrote:
> >>The current implementation of PAM and the PCI holes is broken in several
> >>ways:
> >>
> >> - PCI BARs are not restricted to the PCI hole (a BAR may hide memory)
> >
> >Technically, a BAR can be mapped to any non-RAM memory location.
>
> I understood TOM (Top Of Memory) to be fixed - can't find a register
> for it - but maybe I misread the spec.
>
PIIX3 spec:

2.2.11. TOM—TOP OF MEMORY REGISTER (Function 0)
Address Offset: 69h
Default Value: 02h
Attribute: Read/Write

--
Gleb.