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

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Message-ID: <m17ibz4tu4.fsf@frodo.ebiederm.org>
Date:	Sat, 05 Jul 2008 19:41:55 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Sean Young <sean@...s.org>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	linux-kernel@...r.kernel.org, "H. Anvin" <hpa@...or.com>
Subject: Re: Regression: boot failure on AMD Elan TS-5500

Sean Young <sean@...s.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?

If that hadn't been the case I would have used that form more to remove the
dependencies before we reached lgdt in haed.S when I was in there years ago.

Eric
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