Re: Regression: boot failure on AMD Elan TS-5500

[H. Peter Anvin]

Eric W. Biederman wrote:
> Sean Young <sean@xxxxxxxx> writes:
>
> > On Mon, Jun 30, 2008 at 02:52:10PM -0700, Jeremy Fitzhardinge wrote:
> > > It's a bit odd that the boot loader neglected to set up ds properly, but 
> > > changing the testb line to
> > >
> > > 	testb $(1<<6), %cs:BP_loadflags(%esi)
> > >
> > > should work.  (Or perhaps a %ss: override would be better?)
> > Yup, it does (%cs: prefix).
>
> Guys I have a fuzzy memory of reads and definitely writes through %cs not working,
> on some processor models.  i386?

You can never write through %cs in protected mode.

You can read through %cs: in protected mode unless %cs contains an 
execute-only descriptor.

	-hpa
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