From owner-freebsd-arch@FreeBSD.ORG  Thu Dec 11 16:29:17 2003
Return-Path: <owner-freebsd-arch@FreeBSD.ORG>
Delivered-To: freebsd-arch@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 9380616A4CE
	for <arch@freebsd.org>; Thu, 11 Dec 2003 16:29:17 -0800 (PST)
Received: from arginine.spc.org (arginine.spc.org [195.206.69.236])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 26D1143D33
	for <arch@freebsd.org>; Thu, 11 Dec 2003 16:29:16 -0800 (PST)
	(envelope-from bms@spc.org)
Received: from localhost (localhost [127.0.0.1])
	by arginine.spc.org (Postfix) with ESMTP
	id 482F965319; Fri, 12 Dec 2003 00:29:14 +0000 (GMT)
Received: from arginine.spc.org ([127.0.0.1])
 by localhost (arginine.spc.org [127.0.0.1]) (amavisd-new, port 10024)
 with LMTP id 86516-04; Fri, 12 Dec 2003 00:29:13 +0000 (GMT)
Received: from saboteur.dek.spc.org (unknown [82.147.19.91])
	(using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits))
	(No client certificate requested)
	by arginine.spc.org (Postfix) with ESMTP
	id E79F16530E; Fri, 12 Dec 2003 00:29:09 +0000 (GMT)
Received: by saboteur.dek.spc.org (Postfix, from userid 1001)
	id 799DA2F; Fri, 12 Dec 2003 00:29:05 +0000 (GMT)
Date: Fri, 12 Dec 2003 00:29:02 +0000
From: Bruce M Simpson <bms@spc.org>
To: "M. Warner Losh" <imp@bsdimp.com>
Message-ID: <20031212002902.GB83410@saboteur.dek.spc.org>
References: <XFMail.20031211164407.jhb@FreeBSD.org>
	<20031211145311.Q51054@root.org> <20031211.162119.128604849.imp@bsdimp.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20031211.162119.128604849.imp@bsdimp.com>
cc: arch@freebsd.org
cc: nate@root.org
Subject: Re: Common device driver classes?
X-BeenThere: freebsd-arch@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Discussion related to FreeBSD architecture
	<freebsd-arch.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-arch>,
	<mailto:freebsd-arch-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-arch>
List-Post: <mailto:freebsd-arch@freebsd.org>
List-Help: <mailto:freebsd-arch-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-arch>,
	<mailto:freebsd-arch-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 12 Dec 2003 00:29:17 -0000

I'm tracking the outcome of this discussion so I know where to put things
like cache geometry discovery. My original plan was to assume uniform
cache and TLB geometry across all CPUs in the system. This may not be
the case. In which case implementing it via ivars may be more appropriate
if Nate chooses to go down this road -- but this leaves the problem of
how to export these properties easily to the userland.

This is to facilitate getting at these properties a bit easier and
machine-independent (I note that the current NDIS and PowerPC efforts
could probably use this stuff).

BMS