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

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Message-ID: <486A9257.1050302@zytor.com>
Date:	Tue, 01 Jul 2008 13:23:51 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Sean Young <sean@...s.org>
CC:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	linux-kernel@...r.kernel.org
Subject: Re: Regression: boot failure on AMD Elan TS-5500

Sean Young wrote:
> On Mon, Jun 30, 2008 at 03:42:47PM -0700, H. Peter Anvin wrote:
>> Jeremy Fitzhardinge wrote:
>>> Maybe it really does require the far jump immediately after setting PE 
>>> in cr0...
>>>
>>> Hm, I don't remember this paragraph being in vol 3a, section 8.9.1 
>>> before.  Is it a recent addition?
>>>
>>>   Random failures can occur if other instructions exist between steps
>>>   3 and 4 above.  Failures will be readily seen in some situations,
>>>   such as when instructions that reference memory are inserted between
>>>   steps 3 and 4 while in system management mode.
>>>
>> I don't remember that, either.
> 
> Which document are we talking about? 
> 

Intel's Software Developer's Manual, volume 3a.

> I'm afraid it doesn't work. Maybe I can find something in the AMD Elan
> documentation. Would a fence make sense?

Not really.  In particular, I really don't want to add something that is 
even remotely likely to break on other platforms, and a fence 
instruction is relatively recent.

	-hpa
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