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 18:20:35 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Thu, 21 Jun 2001 18:20:25 -0400 Received: from pizda.ninka.net ([216.101.162.242]:38795 "EHLO pizda.ninka.net") by vger.kernel.org with ESMTP id ; Thu, 21 Jun 2001 18:20:15 -0400 From: "David S. Miller" MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <15154.29468.215080.602628@pizda.ninka.net> Date: Thu, 21 Jun 2001 15:20:12 -0700 (PDT) To: Pete Zaitcev Cc: root@chaos.analogic.com, linux-kernel@vger.kernel.org Subject: Re: Is it useful to support user level drivers In-Reply-To: <200106212206.f5LM6dK12282@devserv.devel.redhat.com> In-Reply-To: <200106212206.f5LM6dK12282@devserv.devel.redhat.com> X-Mailer: VM 6.75 under 21.1 (patch 13) "Crater Lake" XEmacs Lucid Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org 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". Later, David S. Miller davem@redhat.com