From owner-cvs-src@FreeBSD.ORG Sat Jun 7 03:26:09 2008 Return-Path: Delivered-To: cvs-src@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 42034106566C; Sat, 7 Jun 2008 03:26:09 +0000 (UTC) (envelope-from jhb@freebsd.org) Received: from server.baldwin.cx (bigknife-pt.tunnel.tserv9.chi1.ipv6.he.net [IPv6:2001:470:1f10:75::2]) by mx1.freebsd.org (Postfix) with ESMTP id DD3158FC15; Sat, 7 Jun 2008 03:26:08 +0000 (UTC) (envelope-from jhb@freebsd.org) Received: from localhost.corp.yahoo.com (john@localhost [IPv6:::1]) (authenticated bits=0) by server.baldwin.cx (8.14.2/8.14.2) with ESMTP id m573Q2sf018402; Fri, 6 Jun 2008 23:26:02 -0400 (EDT) (envelope-from jhb@freebsd.org) From: John Baldwin To: src-committers@freebsd.org Date: Fri, 6 Jun 2008 23:11:17 -0400 User-Agent: KMail/1.9.7 References: <200806070307.m5737jno010251@repoman.freebsd.org> In-Reply-To: <200806070307.m5737jno010251@repoman.freebsd.org> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-15" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200806062311.17987.jhb@freebsd.org> X-Greylist: Sender succeeded SMTP AUTH authentication, not delayed by milter-greylist-2.0.2 (server.baldwin.cx [IPv6:::1]); Fri, 06 Jun 2008 23:26:02 -0400 (EDT) X-Virus-Scanned: ClamAV 0.91.2/7390/Fri Jun 6 13:50:38 2008 on server.baldwin.cx X-Virus-Status: Clean X-Spam-Status: No, score=-2.5 required=4.2 tests=AWL,BAYES_00,NO_RELAYS autolearn=ham version=3.1.3 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on server.baldwin.cx Cc: cvs-src@freebsd.org, cvs-all@freebsd.org Subject: Re: cvs commit: src/sys/boot/i386/libi386 biossmap.c X-BeenThere: cvs-src@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: CVS commit messages for the src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 07 Jun 2008 03:26:09 -0000 On Friday 06 June 2008 11:07:32 pm John Baldwin wrote: > jhb 2008-06-07 03:07:32 UTC > > FreeBSD src repository > > Modified files: > sys/boot/i386/libi386 biossmap.c > Log: > SVN rev 179631 on 2008-06-07 03:07:32Z by jhb > > Workaround a bug in the BIOS of Dell R900 machines. Specifically, each > entry in the SMAP is a 20 byte structure and they are queried from the > BIOS via sucessive BIOS calls. Due to an apparent bug in the R900's > BIOS, for some SMAP requests the BIOS overflows the 20 byte buffer > trashing a few bytes of memory immediately after the SMAP structure. As > a workaround, add 8 bytes of padding after the SMAP structure used in > the loader for SMAP queries. > > PR: i386/122668 > Submitted by: Mike Hibler mike flux.utah.edu, silby > MFC after: 3 days The code to parse the SMAP in the kernel from vm86 mode is unaffected as it allocates an entire page for use when fetching the SMAP entry. -- John Baldwin