Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932296AbVKGRLO (ORCPT ); Mon, 7 Nov 2005 12:11:14 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932316AbVKGRLN (ORCPT ); Mon, 7 Nov 2005 12:11:13 -0500 Received: from pollux.ds.pg.gda.pl ([153.19.208.7]:16137 "EHLO pollux.ds.pg.gda.pl") by vger.kernel.org with ESMTP id S932296AbVKGRLM (ORCPT ); Mon, 7 Nov 2005 12:11:12 -0500 Date: Mon, 7 Nov 2005 17:11:18 +0000 (GMT) From: "Maciej W. Rozycki" To: Zachary Amsden Cc: Andi Kleen , linux-kernel@vger.kernel.org Subject: Re: 2.6.14: CR4 not needed to be inspected on the 486 anymore? In-Reply-To: <436F8601.4070201@vmware.com> Message-ID: References: <436A3C10.9050302@vmware.com> <436AA1FD.3010401@vmware.com> <436F7673.5040309@vmware.com> <436F8601.4070201@vmware.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1509 Lines: 33 On Mon, 7 Nov 2005, Zachary Amsden wrote: > Because I hold in my hand "i486 Microprocessor Programmer's Reference > Manual, c 1990", and it has no mention whatsoever of CR4, and all Ah, that's too old. Severely. By definition it can only cover the original i486, perhaps even only before the i486SX has been released (and the original renamed to the i486DX). > documentation I had until Friday had either no mention of CR4, or You've had to have the right bits of documentation -- Intel has been quite precise about presence or absence of these bits in given members of the i486 family, but you've had to check specifically each datasheet and yes, there was a separate one for each member up till the grand merge in 1995 or so, when model specifics became chapters of the combined spec ("Intel486 Processor Family Developer's Manual" or something like that). I still own the pile of printed books, including the latter, but not easily accessible anymore. > something to the effect of "new on Pentium, the CR4 register ..." So > I've had to re-adjust my definition of 486, which was weird. Note that the workstation version of the i486 continued to evolve up to around 1995, IIRC, and unsurprisingly got some updates "from upstream". ;-) Maciej - 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/