From: "H. Peter Anvin" <hpa@zytor.com>
To: "David P. Reed" <dpreed@reed.com>
Cc: Rene Herman <rene.herman@keyaccess.nl>,
Paul Rolland <rol@as2917.net>,
David Newall <david@davidnewall.com>,
Krzysztof Halasa <khc@pm.waw.pl>, Pavel Machek <pavel@ucw.cz>,
Andi Kleen <andi@firstfloor.org>,
Alan Cox <alan@lxorguk.ukuu.org.uk>,
linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
rol@witbe.net
Subject: Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
Date: Tue, 11 Dec 2007 09:05:06 -0800 [thread overview]
Message-ID: <475EC342.8080901@zytor.com> (raw)
In-Reply-To: <475EC1C0.2040000@reed.com>
David P. Reed wrote:
> I do remind all that 0x80 is a BIOS-specific standard, and is per BIOS -
> other ports have been used in the history of the IBM PC family by some
> vendors, and some machines have used it for DMA port mapping!!
Correction: ALL machines use it for DMA port mapping. The port is
assigned to the legacy DMA controller, but performs no operation.
That's what makes it safe to write (NOT read!)
-hpa
next prev parent reply other threads:[~2007-12-11 17:06 UTC|newest]
Thread overview: 125+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-06 22:38 RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops David P. Reed
2007-12-07 0:15 ` Alan Cox
2007-12-07 10:44 ` Andi Kleen
2007-12-07 14:50 ` David P. Reed
2007-12-05 11:10 ` Pavel Machek
2007-12-08 0:21 ` Andi Kleen
2007-12-07 14:54 ` Andi Kleen
2007-12-07 15:43 ` Rene Herman
2007-12-07 16:28 ` Rene Herman
2007-12-11 0:31 ` H. Peter Anvin
2007-12-11 5:53 ` H. Peter Anvin
2007-12-07 16:04 ` Alan Cox
2007-12-07 16:31 ` Andi Kleen
2007-12-07 17:19 ` Alan Cox
2007-12-07 18:45 ` Rene Herman
2007-12-07 18:42 ` Alan Cox
2007-12-07 19:25 ` Rene Herman
2007-12-07 21:45 ` Alan Cox
2007-12-08 19:25 ` David P. Reed
2007-12-08 19:50 ` Andi Kleen
2007-12-08 20:47 ` David P. Reed
2007-12-08 21:04 ` Alan Cox
2007-12-08 20:26 ` Alan Cox
2007-12-11 5:58 ` H. Peter Anvin
2007-12-09 5:04 ` Rene Herman
2007-12-09 13:22 ` Pavel Machek
2007-12-11 15:14 ` Lennart Sorensen
2007-12-09 12:54 ` Pavel Machek
2007-12-09 13:41 ` Dr. David Alan Gilbert
2007-12-09 15:54 ` Ondrej Zary
2007-12-09 16:59 ` Andi Kleen
2007-12-09 21:25 ` Pavel Machek
2007-12-09 22:29 ` Alan Cox
2007-12-09 23:22 ` Pavel Machek
2007-12-10 12:02 ` Alan Cox
2007-12-10 4:17 ` Rene Herman
2007-12-10 11:30 ` Krzysztof Halasa
2007-12-10 12:08 ` Rene Herman
2007-12-10 18:02 ` Ondrej Zary
2007-12-11 1:10 ` David Newall
2007-12-11 1:25 ` H. Peter Anvin
2007-12-11 1:42 ` David Newall
2007-12-11 1:46 ` H. Peter Anvin
2007-12-11 1:51 ` H. Peter Anvin
2007-12-11 7:40 ` Paul Rolland
2007-12-11 9:50 ` Rene Herman
2007-12-11 12:08 ` David Newall
2007-12-11 13:16 ` Rene Herman
2007-12-11 13:32 ` Paul Rolland
2007-12-11 14:15 ` Rene Herman
2007-12-11 15:28 ` Rene Herman
2007-12-11 15:37 ` Paul Rolland
2007-12-11 15:53 ` Rene Herman
2007-12-11 16:58 ` David P. Reed
2007-12-11 17:01 ` Rene Herman
2007-12-11 17:05 ` H. Peter Anvin [this message]
2007-12-11 17:32 ` Alan Cox
2007-12-11 19:19 ` David P. Reed
2007-12-11 19:36 ` Pavel Machek
2007-12-11 20:16 ` Alan Cox
2007-12-11 20:27 ` linux-os (Dick Johnson)
2007-12-11 20:34 ` Rene Herman
2007-12-11 21:03 ` David P. Reed
2007-12-11 23:56 ` David P. Reed
2007-12-12 13:11 ` linux-os (Dick Johnson)
2007-12-12 16:12 ` Alan Cox
2007-12-14 14:33 ` Ingo Molnar
2007-12-16 21:26 ` Pavel Machek
2007-12-17 0:02 ` Alan Cox
2007-12-17 0:03 ` Alan Cox
2007-12-17 0:28 ` Pavel Machek
2007-12-17 14:42 ` Ingo Molnar
2007-12-27 10:39 ` Pavel Machek
2007-12-12 19:42 ` Attitude problems David P. Reed
2007-12-12 20:31 ` linux-os (Dick Johnson)
2007-12-14 16:01 ` linux-os (Dick Johnson)
2007-12-11 16:32 ` RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops John Stoffel
2007-12-11 16:40 ` Rene Herman
2007-12-11 13:50 ` David Newall
2007-12-11 14:14 ` Rene Herman
2007-12-11 14:25 ` Alan Cox
2007-12-12 22:18 ` David Newall
2007-12-12 23:00 ` Alan Cox
2007-12-13 13:13 ` David P. Reed
2007-12-13 13:21 ` Alan Cox
2007-12-14 1:50 ` David P. Reed
2007-12-14 15:16 ` Alan Cox
2007-12-11 15:41 ` linux-os (Dick Johnson)
2007-12-11 16:30 ` Andi Kleen
2007-12-11 16:50 ` Rene Herman
2007-12-11 17:00 ` David P. Reed
2007-12-11 17:04 ` Rene Herman
2007-12-11 17:27 ` Rene Herman
2007-12-11 19:18 ` Pavel Machek
2007-12-11 19:16 ` Pavel Machek
2007-12-11 19:59 ` Rene Herman
2007-12-11 19:59 ` Rene Herman
2007-12-11 20:00 ` Rene Herman
2007-12-11 20:00 ` Rene Herman
2007-12-12 20:07 ` More info on port 80 symptoms on MCP51 machine David P. Reed
2007-12-12 20:26 ` Rene Herman
2007-12-12 20:37 ` David P. Reed
2007-12-12 20:58 ` Rene Herman
2007-12-12 21:01 ` Alan Cox
2007-12-12 21:12 ` H. Peter Anvin
2007-12-12 21:29 ` Alan Cox
2007-12-15 22:34 ` Allen Martin
2007-12-15 22:46 ` H. Peter Anvin
2007-12-16 0:46 ` David P. Reed
2007-12-12 21:05 ` H. Peter Anvin
2007-12-14 22:05 ` Chuck Ebbert
2007-12-15 7:22 ` Rene Herman
2007-12-11 13:14 ` RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops Alan Cox
2007-12-11 13:32 ` Andi Kleen
2007-12-11 13:47 ` Pavel Machek
2007-12-11 13:50 ` Andi Kleen
2007-12-14 13:33 ` Ingo Molnar
2007-12-11 6:54 ` Rene Herman
2007-12-11 17:01 ` H. Peter Anvin
[not found] <fa./27SNSh+L5T3iqFNPdHClEu+yT0@ifi.uio.no>
2007-12-07 0:23 ` Robert Hancock
2007-12-07 5:09 ` Rene Herman
2007-12-07 5:54 ` David P. Reed
2007-12-07 7:17 ` Rene Herman
2007-12-07 7:34 ` Rene Herman
2007-12-07 10:49 ` Andi Kleen
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