From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754246AbYHROjZ (ORCPT ); Mon, 18 Aug 2008 10:39:25 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752952AbYHROjS (ORCPT ); Mon, 18 Aug 2008 10:39:18 -0400 Received: from kirk.serum.com.pl ([213.77.9.205]:61870 "EHLO serum.com.pl" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752903AbYHROjR (ORCPT ); Mon, 18 Aug 2008 10:39:17 -0400 Date: Mon, 18 Aug 2008 15:38:09 +0100 (BST) From: "Maciej W. Rozycki" To: David Fries cc: Ingo Molnar , linux-kernel@vger.kernel.org, Pavel Machek , "H. Peter Anvin" , Thomas Gleixner , "Rafael J. Wysocki" Subject: Re: [PATCH] Fix i486 suspend to disk CR4 oops In-Reply-To: <20080818125803.GC17528@spacedout.fries.net> Message-ID: References: <20080818040340.GB17528@spacedout.fries.net> <20080818125803.GC17528@spacedout.fries.net> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 18 Aug 2008, David Fries wrote: > That's what I get for reading the Intel instruction set reference, > "The CR4 register was added to the Intel Architecture beginning with > the Pentium processor." Indeed. It started with the Pentium and some of the i486 models/steppings that were released after the Pentium got the CR4 register implemented too. These include at the least the write-back enhanced versions of the iDX2 and iDX4 processors as well later steppings of the i486SX, which I encountered myself. There could be others -- iSX2? Unfortunately as usually with Intel you have to read all the documents they release to hope to get a full image and even then you'll probably come out confused and with bits of data missing -- if in doubt, check the silicon: it has the most definite information. However these additions were actually documented quite well in the respective i486-class processor datasheets -- IIRC Intel have released a combined version at one point. I am not sure whether it has ever been available on-line. Maciej