From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262246AbTD3RKB (ORCPT ); Wed, 30 Apr 2003 13:10:01 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262247AbTD3RJ6 (ORCPT ); Wed, 30 Apr 2003 13:09:58 -0400 Received: from ltgp.iram.es ([150.214.224.138]:49544 "EHLO ltgp.iram.es") by vger.kernel.org with ESMTP id S262246AbTD3RJA (ORCPT ); Wed, 30 Apr 2003 13:09:00 -0400 From: Gabriel Paubert Date: Wed, 30 Apr 2003 19:19:28 +0200 To: "Eric W. Biederman" Cc: Jamie Lokier , Andi Kleen , joe briggs , linux-kernel@vger.kernel.org Subject: Re: software reset Message-ID: <20030430171928.GB5028@iram.es> References: <200304291037.13598.jbriggs@briggsmedia.com.suse.lists.linux.kernel> <20030430075004.GB13859@mail.jlokier.co.uk> <20030430161525.GA3834@iram.es> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.4i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Apr 30, 2003 at 11:02:41AM -0600, Eric W. Biederman wrote: > Gabriel Paubert writes: > > > On Wed, Apr 30, 2003 at 05:04:59AM -0600, Eric W. Biederman wrote: > > > > > > And as an interesting data point all a triple fault does on a modern > > > system is to put the cpu in a weird stopped state. Some hardware > > > usually the southbridge then detects this and if properly configured > > > will trigger the reset line. > > > > > > I believe this may actually go back into history as far as the 486 but > > > I have not done the researched to see how far back this behavior goes. > > > > Try 286. It was the fastest (actually only) way to make a 286 switch back > > from protected to real mode. > > A triple fault would put a 286 into coma mode? And the hardware had to > reset the chip? > > Just trying to be clear on what you are saying. Yes, that's at least what I remember. Gabriel