Re: [SeaBIOS] seabios 0.6.1 regression

[Avi Kivity]

On 11/15/2010 05:34 PM, Avi Kivity wrote:
> On 11/15/2010 05:12 PM, Avi Kivity wrote:
> > That was premature, the real culprit (if I didn't mess up the bisect) 
> > is:
> >
> > commit 6039fc55274deb7202060d08e0f23b9f3dcface4
> > Author: Kevin O'Connor 
> > Date:   Wed Aug 25 21:43:19 2010 -0400
> > Update qemu_cfg_read to use "rep insb".
> >
> > Use rep insb instead of manual loop - the host may be able to 
> >
> > optimize
> >     the rep insb instruction.
> >
> > Which doesn't make any sense - will do more testing.
>
> Confirmed with multiple tests.

I think it's a miscompile.

out/code16.o:
  1a4:   3e                      ds
  1a5:   6c                      insb   (%dx),%es:(%edi)

Note no 66 prefix.