From: Linus Torvalds <torvalds@osdl.org>
To: "Jeff V. Merkey" <jmerkey@wolfmountaingroup.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
Alan Cox <alan@lxorguk.ukuu.org.uk>, Andi Kleen <ak@suse.de>,
Gerd Knorr <kraxel@suse.de>, Dave Jones <davej@redhat.com>,
Zachary Amsden <zach@vmware.com>, Pavel Machek <pavel@ucw.cz>,
Andrew Morton <akpm@osdl.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Zwane Mwaikambo <zwane@arm.linux.org.uk>,
Pratap Subrahmanyam <pratap@vmware.com>,
Christopher Li <chrisl@vmware.com>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Ingo Molnar <mingo@elte.hu>
Subject: Re: [patch] SMP alternatives
Date: Wed, 23 Nov 2005 11:03:15 -0800 (PST) [thread overview]
Message-ID: <Pine.LNX.4.64.0511231059450.13959@g5.osdl.org> (raw)
In-Reply-To: <4384A63E.6030706@wolfmountaingroup.com>
On Wed, 23 Nov 2005, Jeff V. Merkey wrote:
>
> The lock prefix '0F' is used for a lot of opcodes other than "lock". Go check
> the instruction set reference.
No it's not.
0F is indeed the two-byte prefix. But lock is F0, and it's unique.
Sometimes Intel re-uses the prefixes for other things eg "rep nop", but I
don't think that has ever happened for the lock prefix.
Besides, the instructions look very different internally in the CPU after
decoding, and anyway you'd not want to ignore the lock prefix _early_ at
decode time anyway (many instructions turn into illegal instructions with
a lock prefix, as do reg-reg modrm bytes). So you'd dismiss the lock
prefix not at a byte level, but at a minimum just after the decode stage.
Linus
next prev parent reply other threads:[~2005-11-23 19:03 UTC|newest]
Thread overview: 163+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-10 0:32 [PATCH 1/10] Cr4 is valid on some 486s Zachary Amsden
2005-11-11 10:36 ` Pavel Machek
2005-11-11 17:49 ` H. Peter Anvin
2005-11-11 18:00 ` Maciej W. Rozycki
2005-11-11 19:36 ` Zachary Amsden
2005-11-11 19:58 ` Linus Torvalds
2005-11-11 20:14 ` Zachary Amsden
2005-11-11 20:22 ` Linus Torvalds
2005-11-13 7:42 ` Dave Jones
2005-11-13 10:59 ` Andi Kleen
2005-11-13 17:26 ` Alan Cox
2005-11-13 17:09 ` Eric W. Biederman
2005-11-13 19:00 ` Andi Kleen
2005-11-13 19:07 ` Eric W. Biederman
2005-11-13 19:41 ` Alan Cox
2005-11-13 19:36 ` Linus Torvalds
2005-11-13 21:32 ` Alan Cox
2005-11-14 7:46 ` Arjan van de Ven
2005-11-13 19:56 ` H. Peter Anvin
2005-11-13 19:24 ` Linus Torvalds
2005-11-13 20:29 ` Linus Torvalds
2005-11-14 15:06 ` Gerd Knorr
2005-11-14 19:25 ` Linus Torvalds
2005-11-14 19:46 ` Zachary Amsden
2005-11-14 19:52 ` Arjan van de Ven
2005-11-14 20:34 ` Zachary Amsden
2005-11-14 20:52 ` Arjan van de Ven
2005-11-15 14:12 ` Gerd Knorr
2005-11-15 16:01 ` Gerd Knorr
2005-11-15 16:04 ` Zachary Amsden
2005-11-15 16:06 ` Arjan van de Ven
2005-11-15 16:10 ` Dave Jones
2005-11-15 16:14 ` H. Peter Anvin
2005-11-15 16:19 ` Dave Jones
2005-11-15 16:25 ` Arjan van de Ven
2005-11-15 16:34 ` Zachary Amsden
2005-11-15 16:28 ` H. Peter Anvin
2005-11-15 16:24 ` Zachary Amsden
2005-11-15 16:52 ` Linus Torvalds
2005-11-15 16:16 ` Gerd Knorr
2005-11-15 16:08 ` Roland Dreier
2005-11-16 9:58 ` Gerd Knorr
2005-11-15 16:12 ` Linus Torvalds
2005-11-15 16:16 ` Dave Jones
2005-11-15 16:27 ` Gerd Knorr
2005-11-16 16:12 ` [RFC] SMP alternatives Gerd Knorr
2005-11-22 17:48 ` [patch] " Gerd Knorr
2005-11-22 18:01 ` Pavel Machek
2005-11-23 15:12 ` Vincent Hanquez
2005-11-23 19:17 ` Andi Kleen
2005-11-23 15:29 ` Gerd Knorr
2005-11-23 16:42 ` Alan Cox
2005-11-23 16:39 ` Andi Kleen
2005-11-23 17:21 ` Alan Cox
2005-11-23 16:59 ` Andi Kleen
2005-11-23 22:00 ` Alan Cox
2005-11-24 13:13 ` Andi Kleen
2005-11-24 13:30 ` Eric W. Biederman
2005-11-24 13:39 ` Andi Kleen
2005-11-24 13:58 ` Eric W. Biederman
2005-11-24 19:16 ` thockin
2005-11-24 19:26 ` Andi Kleen
2005-11-24 14:34 ` Alan Cox
2005-11-24 14:22 ` Andi Kleen
2005-11-24 15:15 ` Alan Cox
2005-11-24 14:55 ` Andi Kleen
2005-11-24 15:09 ` Eric W. Biederman
2005-11-24 15:36 ` Andi Kleen
2005-11-24 16:49 ` Eric W. Biederman
2005-11-24 19:12 ` thockin
2005-11-24 19:14 ` Andi Kleen
2005-11-24 19:24 ` thockin
2005-11-24 19:29 ` Andi Kleen
2005-11-24 19:44 ` thockin
2005-11-24 21:20 ` Andi Kleen
2005-11-24 21:40 ` thockin
2005-11-24 23:33 ` Eric W. Biederman
2005-11-24 23:12 ` Alan Cox
2005-11-24 22:48 ` thockin
2005-11-24 23:35 ` Andi Kleen
2005-11-25 0:13 ` Alan Cox
2005-11-25 1:33 ` H. Peter Anvin
2005-11-28 19:15 ` Bill Davidsen
2005-11-24 16:02 ` Alan Cox
2005-11-24 19:09 ` thockin
2005-11-24 14:30 ` Alan Cox
2005-11-23 17:02 ` Linus Torvalds
2005-11-23 18:02 ` H. Peter Anvin
2005-11-23 18:42 ` Linus Torvalds
2005-11-23 17:26 ` Jeff V. Merkey
2005-11-23 19:03 ` Linus Torvalds [this message]
2005-11-23 19:31 ` jmerkey
2005-11-23 18:46 ` Andi Kleen
2005-11-23 19:12 ` H. Peter Anvin
2005-11-23 19:30 ` jmerkey
2005-11-23 21:44 ` Alan Cox
2005-11-23 21:13 ` Andi Kleen
2005-11-23 21:46 ` Jeff Garzik
2005-11-23 22:23 ` Andi Kleen
2005-11-23 22:30 ` Pavel Machek
2005-11-23 22:05 ` Alan Cox
2005-11-23 21:36 ` Arjan van de Ven
2005-11-23 21:36 ` Andi Kleen
2005-11-23 22:13 ` Linus Torvalds
2005-11-23 21:36 ` Linus Torvalds
2005-11-23 21:43 ` Andi Kleen
2005-11-23 22:15 ` Linus Torvalds
2005-11-23 22:22 ` Andi Kleen
2005-11-23 22:25 ` H. Peter Anvin
2005-11-23 22:32 ` Andi Kleen
2005-11-23 22:36 ` H. Peter Anvin
2005-11-23 22:40 ` Andi Kleen
2005-11-23 22:52 ` H. Peter Anvin
2005-11-23 23:10 ` Linus Torvalds
2005-11-24 0:55 ` Jeff Garzik
2005-11-23 21:48 ` Daniel Jacobowitz
2005-11-23 21:53 ` H. Peter Anvin
2005-11-23 22:03 ` Daniel Jacobowitz
2005-11-23 22:09 ` H. Peter Anvin
2005-11-23 22:21 ` Linus Torvalds
2005-11-23 23:29 ` Eric W. Biederman
2005-11-23 23:40 ` Linus Torvalds
2005-11-23 22:19 ` Linus Torvalds
2005-11-23 22:20 ` Daniel Jacobowitz
2005-11-23 23:08 ` Linus Torvalds
2005-11-23 23:02 ` Jeff V. Merkey
2005-11-23 23:42 ` Daniel Jacobowitz
2005-11-23 23:59 ` Linus Torvalds
2005-11-24 2:06 ` Daniel Jacobowitz
2005-11-24 22:32 ` Ulrich Drepper
2005-11-28 19:58 ` Bill Davidsen
2005-11-24 1:02 ` Jeff Garzik
2005-11-24 13:01 ` Pádraig Brady
2005-11-24 13:12 ` Arjan van de Ven
2005-11-28 19:52 ` Bill Davidsen
2005-11-28 20:05 ` Zachary Amsden
2005-11-28 22:19 ` Jeff V. Merkey
2005-11-28 23:00 ` Zachary Amsden
2005-11-28 23:07 ` H. Peter Anvin
2005-11-28 23:30 ` Zachary Amsden
2005-11-28 23:32 ` H. Peter Anvin
2005-11-28 23:12 ` Andi Kleen
2005-11-23 22:50 ` Alan Cox
2005-11-23 22:22 ` H. Peter Anvin
2005-11-25 7:38 ` Chris Wedgwood
2005-11-25 17:33 ` Linus Torvalds
2005-11-28 20:25 ` Bill Davidsen
2005-11-25 20:13 ` H. Peter Anvin
2005-11-24 3:23 ` Mikulas Patocka
2005-11-24 3:31 ` Mikulas Patocka
2005-11-24 3:55 ` H. Peter Anvin
2005-11-24 22:30 ` Ulrich Drepper
2005-11-23 16:43 ` Gerd Knorr
2005-11-23 16:51 ` H. Peter Anvin
2005-11-24 17:48 linux
2005-11-24 18:48 ` Linus Torvalds
2005-11-24 18:24 colin
2006-01-24 15:33 [PATCH] " Gerd Hoffmann
2006-01-24 16:22 ` Ben Collins
2006-01-25 9:20 ` Gerd Hoffmann
2006-01-26 10:22 ` Pavel Machek
2006-01-26 11:17 ` Gerd Hoffmann
2006-01-26 11:48 ` Pavel Machek
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