From: "H. Peter Anvin" <hpa@zytor.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Sean Young <sean@mess.org>, Jeremy Fitzhardinge <jeremy@goop.org>,
Rusty Russell <rusty@rustcorp.com.au>,
linux-kernel@vger.kernel.org
Subject: Re: Regression: boot failure on AMD Elan TS-5500
Date: Sat, 05 Jul 2008 20:07:03 -0700 [thread overview]
Message-ID: <487036D7.4050400@zytor.com> (raw)
In-Reply-To: <m17ibz4tu4.fsf@frodo.ebiederm.org>
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
prev parent reply other threads:[~2008-07-06 3:14 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-16 12:11 Regression: boot failure on AMD Elan TS-5500 Sean Young
2008-06-16 13:27 ` Rusty Russell
2008-06-16 13:37 ` Jeremy Fitzhardinge
2008-06-16 16:19 ` Sean Young
2008-06-16 17:06 ` H. Peter Anvin
2008-06-16 17:58 ` Sean Young
2008-06-16 18:16 ` H. Peter Anvin
2008-06-16 17:06 ` H. Peter Anvin
2008-06-16 17:07 ` Jeremy Fitzhardinge
2008-06-30 21:43 ` Sean Young
2008-06-30 21:52 ` Jeremy Fitzhardinge
2008-06-30 22:04 ` H. Peter Anvin
2008-06-30 22:14 ` H. Peter Anvin
2008-06-30 22:36 ` Jeremy Fitzhardinge
2008-06-30 22:45 ` H. Peter Anvin
2008-06-30 22:31 ` Sean Young
2008-06-30 22:34 ` Jeremy Fitzhardinge
2008-06-30 22:42 ` H. Peter Anvin
2008-07-01 19:59 ` Sean Young
2008-07-01 20:20 ` Sean Young
2008-07-01 20:24 ` Jeremy Fitzhardinge
2008-07-01 20:25 ` H. Peter Anvin
2008-07-15 22:23 ` Sean Young
2008-07-15 22:30 ` H. Peter Anvin
2008-07-01 20:22 ` Jeremy Fitzhardinge
2008-07-01 20:23 ` H. Peter Anvin
2008-07-01 20:29 ` Jeremy Fitzhardinge
2008-07-01 20:39 ` H. Peter Anvin
2008-07-06 13:21 ` Pavel Machek
2008-06-30 22:09 ` Sean Young
2008-07-06 2:41 ` Eric W. Biederman
2008-07-06 3:07 ` H. Peter Anvin [this message]
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