linux-kernel - Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.

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Message-id: <4765C892.5090005@shaw.ca>
Date:	Sun, 16 Dec 2007 18:53:38 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	"David P. Reed" <dpreed@...d.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, Ingo Molnar <mingo@...e.hu>,
	Rene Herman <rene.herman@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Rene Herman <rene.herman@...access.nl>,
	Pavel Machek <pavel@....cz>
Subject: Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on
 some AMD64x2 laptops, etc.

David P. Reed wrote:
> PS: If I have time, I may try to build Rene's port 80 test for Windows 
> and run it under WinXP on this machine (I still have a crappy little 
> partition that boots it).   If it freezes the same way, it's almost 
> certain a design "feature", and if it doesn't freeze, we might suspect 
> that there is compensating logic in either Windows ACPI code or some way 
> that windows "sets up" the machine.

You'd have to replace the iopl call to an equivalent one for Windows 
(seems like NtSetInformationProcess(ProcessUserModeIOPL) might do what 
you need).

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@...pamshaw.ca
Home Page: http://www.roberthancock.com/

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