From owner-freebsd-current@FreeBSD.ORG  Wed Jun 16 22:44:17 2004
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
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 6984316A4CE
	for <freebsd-current@freebsd.org>;
	Wed, 16 Jun 2004 22:44:17 +0000 (GMT)
Received: from hanoi.cronyx.ru (hanoi.cronyx.ru [144.206.181.53])
	by mx1.FreeBSD.org (Postfix) with ESMTP id B40DD43D49
	for <freebsd-current@freebsd.org>;
	Wed, 16 Jun 2004 22:44:16 +0000 (GMT)	(envelope-from rik@cronyx.ru)
Received: (from root@localhost) by hanoi.cronyx.ru
  id i5GMf9Gg069850 for freebsd-current@freebsd.org.checked; (8.12.8/vak/2.1)
  Thu, 17 Jun 2004 02:41:09 +0400 (MSD) (envelope-from rik@cronyx.ru)
Received: from cronyx.ru (rik.cronyx.ru [172.22.4.1]) by hanoi.cronyx.ru with
	ESMTP  id i5GMdWrH069764; (8.12.8/vak/2.1)
	Thu, 17 Jun 2004 02:39:33 +0400 (MSD) (envelope-from rik@cronyx.ru)
Message-ID: <40D0CABA.1020101@cronyx.ru>
Date: Thu, 17 Jun 2004 02:33:30 +0400
From: Roman Kurakin <rik@cronyx.ru>
User-Agent: Mozilla/5.0 (X11; U; Linux i686; ru-RU; rv:1.2.1) Gecko/20030426
X-Accept-Language: ru-ru, en
MIME-Version: 1.0
To: Bruce Evans <bde@zeta.org.au>
References: <40D070B7.5000009@cronyx.ru>
	<20040617080547.F8883@gamplex.bde.org>
In-Reply-To: <20040617080547.F8883@gamplex.bde.org>
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit
cc: freebsd-current@freebsd.org
Subject: Re: How to catch interrupt
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 16 Jun 2004 22:44:17 -0000

Bruce Evans:

>On Wed, 16 Jun 2004, Roman Kurakin wrote:
>  
>
>>    How to catch interrupt for ISA device before registering handler for it?
>>    
>>
>
>This cannot be done without duplicating lots of interrupt handler
>registration code.  (Actually only a little for a quick MD hack: just
>setidt() to point to an interrupt handler, plus enabling the ICU^WPIC,
>plus changing the normal code to not un-enable the PIC.  npx.c still
>does something like this in RELENG_4.)
>
>However, you may only need to test for pending interrupts.  This can
>be done for isa interrupts using isa_irq_pending() to get a bitmap of
>
It seems that this function is not working for interrupts that were 
already used
by some driver before I call it.

rik

>pending irqs.  See sio.c.  On i386's there are also some newer harder
>to use even less portable interfaces for determining pending irqs.
>See i386/include/intr_machdep.h.
>
>Bruce
>
>
>  
>