Date: Wed, 05 Nov 2003 17:42:45 -0500 (EST) From: John Baldwin <jhb@FreeBSD.org> To: Alex Wilkinson <alex.wilkinson@dsto.defence.gov.au> Cc: Harald Schmalzbauer <h@schmalzbauer.de> Subject: Re: New <PNP0303> and aPic question Message-ID: <XFMail.20031105174245.jhb@FreeBSD.org> In-Reply-To: <20031104215033.GC90988@squirm.dsto.defence.gov.au>
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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 <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/
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