Re: [Qemu-devel] Re: [RFC] 64 bit i/o

[Blue Swirl]

On 1/2/08, Brian Johnson <address@hidden> wrote:
> Robert Reif wrote:
> > Paul Brook wrote:
> >>
> >> Couldn't you just latch the value when one half is accessed?
> >>
> > In this one specific case you could do that but this is not the only
> > case in sparc32 (TOD, MXCC, ...) and other architectures with 64 bit
> > hardware have similar requirements.
> >
> > This is a generic solution that fills a hole in the qemu
> > implementation.
>
> Agreed.  Some non-PC hardware has 64-bit registers which need to be
> accessed as 64-bit quantities, in order to read or write all fields at
> once.  Qemu should support 64-bit I/O.

On Sparc64 many registers can only be handled using 64 bit accesses,
other methods should raise an exception.