From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 27 Oct 2000 03:35:16 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 27 Oct 2000 03:35:06 -0400 Received: from neon-gw.transmeta.com ([209.10.217.66]:8456 "EHLO neon-gw.transmeta.com") by vger.kernel.org with ESMTP id ; Fri, 27 Oct 2000 03:34:53 -0400 To: linux-kernel@vger.kernel.org From: "H. Peter Anvin" Subject: Re: missing mxcsr initialization Date: 27 Oct 2000 00:34:47 -0700 Organization: Transmeta Corporation, Santa Clara CA Message-ID: <8tbb6n$85r$1@cesium.transmeta.com> In-Reply-To: <20001026021731.B23895@athlon.random> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Comment-To: Alan Cox Disclaimer: Not speaking for Transmeta in any way, shape, or form. Copyright: Copyright 2000 H. Peter Anvin - All Rights Reserved Followup to: By author: Alan Cox In newsgroup: linux.dev.kernel > > > > corrected for include the facts that the XMM feature bit is an Intel specific > > > bit that other vendors may use for other things, so you need to test vendor == > > ^^^ > > Note that they shouldn't do that! I would consider a very bad thing if they > > goes out of sync on those bits. > > CPUID is vendor specific. Every bit in those fields is vendor specific. Every > piece of documentation tells you to check the CPU vendor. Every time we didnt > bother we got burned. > > I keep hearing people saying things like 'bad thing' 'assume standards'. Well > all I can say is cite a vendor issued document which says 'dont bother checking > the vendor'. > Intel does it because they want every other chip out there to act like a 486. > > And when you can't find that document, put the checks in so we dont crash on > an Athlon or when using MTRR on a Cyrix III etc > Chips that don't implement what they claim to implement are buggy and should be treated as such. SPECIAL-CASE THE BUGGY CHIPS, NOT THE PROPERLY FUNCTIONING ONES. -hpa -- at work, in private! "Unix gives you enough rope to shoot yourself in the foot." http://www.zytor.com/~hpa/puzzle.txt - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/