From owner-freebsd-hackers  Fri Nov  7 01:37:49 1997
Return-Path: <owner-freebsd-hackers>
Received: (from root@localhost)
          by hub.freebsd.org (8.8.7/8.8.7) id BAA21678
          for hackers-outgoing; Fri, 7 Nov 1997 01:37:49 -0800 (PST)
          (envelope-from owner-freebsd-hackers)
Received: from word.smith.net.au (word.smith.net.au [202.0.75.3])
          by hub.freebsd.org (8.8.7/8.8.7) with ESMTP id BAA21665
          for <hackers@FreeBSD.ORG>; Fri, 7 Nov 1997 01:37:16 -0800 (PST)
          (envelope-from mike@word.smith.net.au)
Received: from word.smith.net.au (localhost.smith.net.au [127.0.0.1])
	by word.smith.net.au (8.8.7/8.8.5) with ESMTP id UAA00302;
	Fri, 7 Nov 1997 20:03:06 +1030 (CST)
Message-Id: <199711070933.UAA00302@word.smith.net.au>
X-Mailer: exmh version 2.0zeta 7/24/97
To: Jonathan Mini <mini@d198-232.uoregon.edu>
cc: Mike Smith <mike@smith.net.au>, hackers@FreeBSD.ORG
Subject: Re: x86 gods; advice? Suggestions? 
In-reply-to: Your message of "Fri, 07 Nov 1997 00:04:30 -0800."
             <19971107000430.02841@micron.mini.net> 
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Date: Fri, 07 Nov 1997 20:03:05 +1030
From: Mike Smith <mike@smith.net.au>
Sender: owner-freebsd-hackers@FreeBSD.ORG
X-Loop: FreeBSD.org
Precedence: bulk

> What privelege level is this running at? 

It has to run with DPL = 0.

> Why not just execute an illegal instruction and catch it? 

Because this is in the kernel context, and I've no way of knowing how 
to say "just for now I want illegal instructions to come here".

> (in my vm86 code, I use hlt for this all the time)

Yes, that's what JL uses to kill execution after his interrupt thunk 
(which is working wonderfully BTW).

mike