From owner-freebsd-questions@FreeBSD.ORG Wed Mar 10 08:14:15 2004 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 4902816A4CF for ; Wed, 10 Mar 2004 08:14:15 -0800 (PST) Received: from clunix.cl.msu.edu (clunix.cl.msu.edu [35.9.2.10]) by mx1.FreeBSD.org (Postfix) with ESMTP id BB93843D1D for ; Wed, 10 Mar 2004 08:14:14 -0800 (PST) (envelope-from jerrymc@clunix.cl.msu.edu) Received: (from jerrymc@localhost) by clunix.cl.msu.edu (8.11.7p1+Sun/8.11.7) id i2AGE3b08293; Wed, 10 Mar 2004 11:14:03 -0500 (EST) From: Jerry McAllister Message-Id: <200403101614.i2AGE3b08293@clunix.cl.msu.edu> To: doublef@tele-kom.ru (Sergey 'DoubleF' Zaharchenko) Date: Wed, 10 Mar 2004 11:14:03 -0500 (EST) In-Reply-To: <20040310081200.51b84ef1@Hal.localdomain> from "Sergey 'DoubleF' Zaharchenko" at Mar 10, 2004 08:12:00 AM X-Mailer: ELM [version 2.5 PL2] MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit cc: Jason Dictos cc: "'freebsd-questions@freebsd.org'" Subject: Re: Using int 13 while BSD is running X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Mar 2004 16:14:15 -0000 > > --Signature=_Wed__10_Mar_2004_08_12_00_+0300_m3U9Vu7vS=cMcNXd > Content-Type: text/plain; charset=US-ASCII > Content-Disposition: inline > Content-Transfer-Encoding: 7bit > > On Tue, 9 Mar 2004 14:03:34 -0800 > Jason Dictos probably wrote: > > > The situation is > > this, currently we licenses Caldera DOS for a program we wrote which > > uses the int13 extensions to manipulate the systems hard drive (i.e. > > to recover partition tables and what not). This forces our application > > to be written in 16 bit mode, but it does allows us to not have to > > worry about loading any driver which would be hardware specific to > > access the hard drive. > > Through the /dev/ad[0-9] (ide) or /dev/da[0-9] (scsi/usb) you can get > access to any byte in you harddrive. They `look like' ordinary files to > most programs. Just seek the appropriate number of bytes and read what > you want (0-512 is the mbr, for example). You don't even need to write a > line in assembly for that, just plain C (or even shell-script, if you > prefer that). Gee whiz, just let dd(1) do it for you. It can seek to any position and read any number of bytes of a disk. If it gets ornery, set the block size to 1 byte - a little slow and efficient, but then it won't have trouble with other block arrangements. ////jerry > > > Is there > > any way to write a driver for BSD which would put the processor into > > real mode, therefore allowing us to use the int 13 api of the bios to > > read and write hard drives? > > Putting the cpu back into real mode is kind of perversion. And I don't > think FreeBSD provides any real mode interface. Whatever you would see > in real mode, you can bet it isn't a FreeBSD driver for your harddrive. > > -- > DoubleF > Romeo wasn't bilked in a day. > -- Walt Kelly, "Ten Ever-Lovin' Blue-Eyed Years With > Pogo" > > --Signature=_Wed__10_Mar_2004_08_12_00_+0300_m3U9Vu7vS=cMcNXd > Content-Type: application/pgp-signature > > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.2.4 (FreeBSD) > > iD8DBQFATqOrwo7hT/9lVdwRAinPAJ9rsC9Tzum5970w88Ze0o+skKwbTgCbBE0S > 6bUkIwtlJePcYTsq1Ja/0gU= > =F4fi > -----END PGP SIGNATURE----- > > --Signature=_Wed__10_Mar_2004_08_12_00_+0300_m3U9Vu7vS=cMcNXd-- > >