From owner-freebsd-hackers  Thu May  9 15:56:28 2002
Delivered-To: freebsd-hackers@freebsd.org
Received: from gull.prod.itd.earthlink.net (gull.mail.pas.earthlink.net [207.217.120.84])
	by hub.freebsd.org (Postfix) with ESMTP id 3281437B408
	for <hackers@freebsd.org>; Thu,  9 May 2002 15:56:25 -0700 (PDT)
Received: from pool0102.cvx40-bradley.dialup.earthlink.net ([216.244.42.102] helo=mindspring.com)
	by gull.prod.itd.earthlink.net with esmtp (Exim 3.33 #2)
	id 175wpi-0001Id-00; Thu, 09 May 2002 15:56:23 -0700
Message-ID: <3CDAFE72.E1EDE979@mindspring.com>
Date: Thu, 09 May 2002 15:55:46 -0700
From: Terry Lambert <tlambert2@mindspring.com>
X-Mailer: Mozilla 4.7 [en]C-CCK-MCD {Sony}  (Win98; U)
X-Accept-Language: en
MIME-Version: 1.0
To: Josef Karthauser <joe@tao.org.uk>
Cc: hackers@freebsd.org
Subject: Re: Soft interrupts
References: <20020509223740.GC8889@genius.tao.org.uk>
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Sender: owner-freebsd-hackers@FreeBSD.ORG
Precedence: bulk
List-ID: <freebsd-hackers.FreeBSD.ORG>
List-Archive: <http://docs.freebsd.org/mail/> (Web Archive)
List-Help: <mailto:majordomo@FreeBSD.ORG?subject=help> (List Instructions)
List-Subscribe: <mailto:majordomo@FreeBSD.ORG?subject=subscribe%20freebsd-hackers>
List-Unsubscribe: <mailto:majordomo@FreeBSD.ORG?subject=unsubscribe%20freebsd-hackers>
X-Loop: FreeBSD.ORG

Josef Karthauser wrote:
> Do we have soft interrupts?

Yes.  The easiest one to use is NETISR.  Software interrupts
are called from reenabling hardware interrupts.  See _doreti
in /sys/i386/isa/ipl.s

static void
ipintr(void)
{
	...
}

void
ip_init()
{
	...
	register_netisr(NETISR_IP, ipintr);
}

See net/netisr.h for a place to pick a number that isn't used (i.e. do
not step on NETISR_IP or some other place it's called).

Note that the index is limited to 0..31, since there is a hard coded
limit of 32 entries on the netisrs array.

It's almost even appropriate to treat USB as a network stack...

-- Terry

To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-hackers" in the body of the message