linux-kernel - Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops

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Message-ID: <20071211151443.GE2310@csclub.uwaterloo.ca>
Date:	Tue, 11 Dec 2007 10:14:43 -0500
From:	lsorense@...lub.uwaterloo.ca (Lennart Sorensen)
To:	"David P. Reed" <dpreed@...d.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops

On Sat, Dec 08, 2007 at 02:25:02PM -0500, David P. Reed wrote:
> In any case, my machine does not have an ISA bus.  Why should it?  It's 
> a laptop!

Really?  Are you sure?  How does the CPU talk to the BIOS?  How about
the parallel port if you have one? (I will assume you have no serial
ports since almost no laptop does anymore).  Just because you don't see
such a bus doesn't mean you don't have one.  Even PCMCIA uses the ISA
bus, although many new laptops are starting to have expresscard slots
instead which elliminates that problem.  LPC (which is ISA in a
different form factor) is still around on most if not all x86 systems.

--
Len Sorensen
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