From owner-freebsd-current@FreeBSD.ORG Wed Nov 5 14:43:11 2003 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 82F0816A4CF for ; Wed, 5 Nov 2003 14:43:11 -0800 (PST) Received: from mail.speakeasy.net (mail6.speakeasy.net [216.254.0.206]) by mx1.FreeBSD.org (Postfix) with ESMTP id 72B5543FAF for ; Wed, 5 Nov 2003 14:43:10 -0800 (PST) (envelope-from jhb@FreeBSD.org) Received: (qmail 350 invoked from network); 5 Nov 2003 22:43:09 -0000 Received: from unknown (HELO server.baldwin.cx) ([216.27.160.63]) (envelope-sender )encrypted SMTP for ; 5 Nov 2003 22:43:09 -0000 Received: from laptop.baldwin.cx (gw1.twc.weather.com [216.133.140.1]) by server.baldwin.cx (8.12.9/8.12.9) with ESMTP id hA5Mgjce077296; Wed, 5 Nov 2003 17:42:45 -0500 (EST) (envelope-from jhb@FreeBSD.org) Message-ID: X-Mailer: XFMail 1.5.4 on FreeBSD X-Priority: 3 (Normal) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit MIME-Version: 1.0 In-Reply-To: <20031104215033.GC90988@squirm.dsto.defence.gov.au> Date: Wed, 05 Nov 2003 17:42:45 -0500 (EST) From: John Baldwin To: Alex Wilkinson X-Spam-Checker-Version: SpamAssassin 2.55 (1.174.2.19-2003-05-19-exp) cc: current@freebsd.org cc: Harald Schmalzbauer Subject: Re: New and aPic question X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 05 Nov 2003 22:43:11 -0000 X-List-Received-Date: Wed, 05 Nov 2003 22:43:11 -0000 On 04-Nov-2003 Alex Wilkinson wrote: > On Tue, Nov 04, 2003 at 12:56:07PM -0500, John Baldwin wrote: > > Yes. As long as you have 'device apic' in your kernel config, > APICs will be used to route interrupts even on UP machines if > the machine includes an MP Table or ACPI is being used and it > contains an MADT. > > Reading thread and not following the acronyms. > > Ok 2 questions: > > 1. what is an MP Table ? It's a table included on SMP systems built by the BIOS that lists local APICs (CPUs) and I/O APICs as well as routing information about what interrupts (both ISA and PCI) are hooked up to which interrupt pins on each of the APICs. > 2. What is MADT ? ACPI's stripped down version of the MP Table called a Multiple Apic Descriptor Table. It lists local APICs and IO APICs as well as nonstandard ISA interrupt routings. It does not include information about PCI interrupts. -- John Baldwin <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/