From owner-freebsd-hackers@FreeBSD.ORG  Fri Dec 10 17:38:47 2004
Return-Path: <owner-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 6015416A4CE
	for <freebsd-hackers@freebsd.org>;
	Fri, 10 Dec 2004 17:38:47 +0000 (GMT)
Received: from harmony.village.org (rover.village.org [168.103.84.182])
	by mx1.FreeBSD.org (Postfix) with ESMTP id A750B43D54
	for <freebsd-hackers@freebsd.org>;
	Fri, 10 Dec 2004 17:38:46 +0000 (GMT)	(envelope-from imp@bsdimp.com)
Received: from localhost (warner@rover2.village.org [10.0.0.1])
	by harmony.village.org (8.13.1/8.13.1) with ESMTP id iBAHag2j033127;
	Fri, 10 Dec 2004 10:36:45 -0700 (MST)
	(envelope-from imp@bsdimp.com)
Date: Fri, 10 Dec 2004 10:36:56 -0700 (MST)
Message-Id: <20041210.103656.73381623.imp@bsdimp.com>
To: kamalp@acm.org, kamalpr@yahoo.com
From: "M. Warner Losh" <imp@bsdimp.com>
In-Reply-To: <20041210040529.48001.qmail@web52708.mail.yahoo.com>
References: <41B8C993.4070807@elischer.org>
	<20041210040529.48001.qmail@web52708.mail.yahoo.com>
X-Mailer: Mew version 3.3 on Emacs 21.3 / Mule 5.0 (SAKAKI)
Mime-Version: 1.0
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
cc: wb@freebie.xs4all.nl
cc: gurney_j@resnet.uoregon.edu
cc: julian@elischer.org
cc: freebsd-hackers@freebsd.org
Subject: Re: mmap()
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.1
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: Fri, 10 Dec 2004 17:38:47 -0000

In message: <20041210040529.48001.qmail@web52708.mail.yahoo.com>
            "Kamal R. Prasad" <kamalpr@yahoo.com> writes:
: So how does one use bus_dma within the USB framework?
: The API exists, but I don't think any of the src code
: in src/sys/dev/usb actually uses bus_dma. Oh btw -my
: data transfer is < 100K, so the 64-bit thing is not an
: issue.

It just happens.  The transfers are done via DMA from the usb bridge
chipset.

Warner