From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Thu, 21 Jun 2001 19:11:43 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Thu, 21 Jun 2001 19:11:33 -0400 Received: from ip-64-63-65-105.reverse.mobilenetics.com ([64.63.65.105]:5868 "HELO homa.asicdesigners.com") by vger.kernel.org with SMTP id ; Thu, 21 Jun 2001 19:11:28 -0400 Date: Thu, 21 Jun 2001 16:09:50 -0700 From: Mike Mackovitch To: "David S. Miller" Cc: Pete Zaitcev , root@chaos.analogic.com, linux-kernel@vger.kernel.org Subject: Re: Is it useful to support user level drivers Message-ID: <20010621160949.A10977@wacko.asicdesigners.com> In-Reply-To: <200106212206.f5LM6dK12282@devserv.devel.redhat.com> <15154.29468.215080.602628@pizda.ninka.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.3.15i In-Reply-To: <15154.29468.215080.602628@pizda.ninka.net>; from davem@redhat.com on Thu, Jun 21, 2001 at 03:20:12PM -0700 X-OriginalArrivalTime: 21 Jun 2001 23:11:03.0593 (UTC) FILETIME=[716E9990:01C0FAA7] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jun 21, 2001 at 03:20:12PM -0700, David S. Miller wrote: > > Pete Zaitcev writes: > > If memory does not deceive me, SunLab Spring processed interrupts > > in user space. I do not remember for sure, but I think QNX did, too. > > User mode interrupt handlers are perfectly doable, provided that the > > hardware allows to mask interrupts selectively. > > SGI's IRIX does it too, for graphics card interrupts like "VBLANK" and > "rendering pipeline FIFO not full anymore". Sorry, but SGI's IRIX does NOT handle graphics interrupts in user space. --macko SGI Graphics Kernel Engineer 1994-1999