From owner-freebsd-hackers@FreeBSD.ORG  Mon Aug 29 15:56:39 2005
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
X-Original-To: freebsd-hackers@freebsd.org
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 8A13E16A433
	for <freebsd-hackers@freebsd.org>; Mon, 29 Aug 2005 15:56:39 +0000 (GMT)
	(envelope-from jhb@FreeBSD.org)
Received: from mv.twc.weather.com (mv.twc.weather.com [65.212.71.225])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 8FF8E43D46
	for <freebsd-hackers@freebsd.org>; Mon, 29 Aug 2005 15:56:38 +0000 (GMT)
	(envelope-from jhb@FreeBSD.org)
Received: from [10.50.40.201] (Not Verified[10.50.40.201]) by
	mv.twc.weather.com with NetIQ MailMarshal (v6, 0, 3, 8)
	id <B431333ca0000>; Mon, 29 Aug 2005 12:11:54 -0400
From: John Baldwin <jhb@FreeBSD.org>
To: freebsd-hackers@freebsd.org
Date: Mon, 29 Aug 2005 11:39:16 -0400
User-Agent: KMail/1.8
References: <29683db2050829051168d821be@mail.gmail.com>
In-Reply-To: <29683db2050829051168d821be@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain;
  charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
Message-Id: <200508291139.17144.jhb@FreeBSD.org>
Cc: Bharath Bhushan <bharath.bhushan@gmail.com>
Subject: Re: interrupt handlers - FreeBSD 4.9
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>, 
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 29 Aug 2005 15:56:39 -0000

On Monday 29 August 2005 08:11 am, Bharath Bhushan wrote:
> 1) What is the purpose of the two interrupt handler arrays ihandler[]
> and intr_handlers[]?

Not sure.  It may be that ihandler is used for INTR_FAST interrupts.

> What I saw on my system:
> (kgdb) print intr_handler
> $8 = {0x302b2d04 <clkintr>, 0x302b9bd4 <atkbd_isa_intr>,
>   0x302b6708 <isa_strayintr>, 0x302be648 <siointr>, 0x302be648 <siointr>,
>   0x302b6708 <isa_strayintr>, 0x302b53e0 <fdc_intr>, 0x30268128 <dc_intr>,
>   0x302b2fa0 <rtcintr>, 0x302b6708 <isa_strayintr>,
>   0x302b6708 <isa_strayintr>, 0x30268128 <dc_intr>,
>   0x302b6708 <isa_strayintr>, 0x302b6708 <isa_strayintr>,
>   0x3017606c <ata_intr>, 0x3017606c <ata_intr>}
> (kgdb) p/a ihandlers
> $11 = 0x302a522e <Xresume0>
> (kgdb) p/a *ihandlers
> $12 = 0x1ec05ff
>
> 2) Does cpl contain the mask to block hardware and software interrupts
> or just for the software interrupts?

Both.  SWI is the upper 8 bits, lower 24 are for hardware.  (24 are used with 
APIC_IO, 16 with the 8259A pics).

-- 
John Baldwin <jhb@FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org