Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261474AbTHYGJK (ORCPT ); Mon, 25 Aug 2003 02:09:10 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261484AbTHYGJK (ORCPT ); Mon, 25 Aug 2003 02:09:10 -0400 Received: from mail.jlokier.co.uk ([81.29.64.88]:51076 "EHLO mail.jlokier.co.uk") by vger.kernel.org with ESMTP id S261474AbTHYGJI (ORCPT ); Mon, 25 Aug 2003 02:09:08 -0400 Date: Mon, 25 Aug 2003 07:09:00 +0100 From: Jamie Lokier To: Mikael Pettersson Cc: jim.houston@comcast.net, linux-kernel@vger.kernel.org Subject: Re: [PATCH] Pentium Pro - sysenter - doublefault Message-ID: <20030825060900.GA21213@mail.jlokier.co.uk> References: <1061498486.3072.308.camel@new.localdomain> <16197.14968.235907.128727@gargle.gargle.HOWL> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <16197.14968.235907.128727@gargle.gargle.HOWL> User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 755 Lines: 17 Mikael Pettersson wrote: > I double-checked AP-485 (24161823.pdf, the "real" reference to CPUID), > and it says (section 3.4) that SEP is unsupported when the signature > as a whole is less that 0x633. This means all PPros, and PII Model 3s > with steppings less than 3. "SEP is unsupported". It's interesting that Pentium Pro erratum #82 is "SYSENTER/SYSEXIT instructions can implicitly load 'null segment selector' to SS and CS registers", implying that SYSENTER does _something_ useful on PPros. -- Jamie - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/