From owner-freebsd-drivers@FreeBSD.ORG Wed May 30 00:09:24 2012 Return-Path: Delivered-To: freebsd-drivers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 6C82F10656A6 for ; Wed, 30 May 2012 00:09:24 +0000 (UTC) (envelope-from tomdean@speakeasy.org) Received: from asbnvacz-mailrelay01.megapath.net (asbnvacz-mailrelay01.megapath.net [207.145.128.243]) by mx1.freebsd.org (Postfix) with ESMTP id 3AB278FC0A for ; Wed, 30 May 2012 00:09:23 +0000 (UTC) Received: from mail6.sea5.speakeasy.net (mail6.sea5.speakeasy.net [69.17.117.50]) by asbnvacz-mailrelay01.megapath.net (Postfix) with ESMTP id 615AAA7097E for ; Tue, 29 May 2012 20:09:23 -0400 (EDT) Received: (qmail 27165 invoked from network); 30 May 2012 00:09:22 -0000 Received: by simscan 1.4.0 ppid: 17189, pid: 31251, t: 0.1450s scanners: clamav: 0.88.2/m:52/d:10739 spam: 3.0.4 Received: from unknown (HELO P9X79.tddhome) (tomdean@[24.113.107.31]) (envelope-sender ) by mail6.sea5.speakeasy.net (qmail-ldap-1.03) with SMTP for ; 30 May 2012 00:09:22 -0000 Message-ID: <4FC56532.8090802@speakeasy.org> Date: Tue, 29 May 2012 17:09:22 -0700 From: "Thomas D. Dean" User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:10.0.2) Gecko/20120310 Thunderbird/10.0.2 MIME-Version: 1.0 To: freebsd-drivers@freebsd.org, phk@FreeBSD.org References: <4FC40922.5030009@speakeasy.org> In-Reply-To: <4FC40922.5030009@speakeasy.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 3.0.4 (2005-06-05) on mail6.sea5 X-Spam-Level: X-Spam-Status: No, score=0.9 required=8.0 tests=FORGED_RCVD_HELO, RATWARE_GECKO_BUILD autolearn=disabled version=3.0.4 Cc: Subject: Re: nanoBSD Driver Build X-BeenThere: freebsd-drivers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Writing device drivers for FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 30 May 2012 00:09:24 -0000 On 05/28/12 16:24, Thomas D. Dean wrote: > I need to build a (for me) complicated driver for nanoBSD running on an In this driver for the Elan SC520, I need to access the mmcr registers. The cpu manual says these registers start at 0xfffef000. In a driver, elan_mmcr written by phk@FreeBSD.org, the mmap function returns i386_btop(0xfffef000). In my driver, I tried to use lcd_mmcr = (struct elan_mmcr *)0xfffef000 and lcd_mmcr = (struct elan_mmcr *)i386_btop(0xfffef000); accessing lcd_mmcr defined either way causes a trap. How do I access these registers? Tom Dean