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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Date:	Mon, 17 Dec 2007 14:52:57 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jan Engelhardt <jengelh@...putergmbh.de>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"David P. Reed" <dpreed@...d.com>, Pavel Machek <pavel@....cz>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Rene Herman <rene.herman@...access.nl>
Subject: Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80
 on some AMD64x2 laptops, etc.

Jan Engelhardt wrote:
> On Dec 15 2007 17:46, Alan Cox wrote:
>>> My understanding is that the linux starts in real mode, and uses the 
>>> BIOS for such things as reading the very first image.   
>> Not always. We may enter from 32bit in some cases, and we may also not
>> have a PC BIOS in the first place.
> 
> Computers without a PC BIOS (I'm trying to think of something, e.g.
> the typical SUN sparc64 box) should have other means of accessing a
> clocksource, no?

We were talking about x86 here, though.

Even on x86 we sometimes run from the 32-bit entrypoint.

	-hpa
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