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SubjectRe: Regression: boot failure on AMD Elan TS-5500
Eric W. Biederman wrote:
> Sean Young <sean@mess.org> 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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