Re: Regression: boot failure on AMD Elan TS-5500
From: H. Peter Anvin
Date: Sat Jul 05 2008 - 23:15:21 EST
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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