b8e4cd2bb3
It boots FreeBSD from a running MS-DOS system. It's compiled using some MS-DOS tools, but there is a binary hidden in the uuencoded file. (Go ahead, flame me if you can come up with a solution for the problem. Just saying "this is bad" doesn't count!) Rod, you were right: one would have to deal with weird interfaces to the memory managers, and it seems that Christian found them all, and made them work. Thanks Christian! Reviewed by: phk Submitted by: DI. Christian Gusenbauer <cg@fimp01.fim.uni-linz.ac.at> Christians README: ------------------ Hi Everybody! This is version 1.5 of "fbsdboot", a program that allows you to boot a kernel from a MS-DOS partition or a FreeBSD partition. This program runs using DOS. It works with various memory managers (like EMM386, 386MAX) under certain circumstances. First, a FreeBSD kernel is always loaded to memory starting at 0x100000. To assure that loading the kernel *does not* overwrite memory used by memory managers, high memory for the kernel is allocated and after loading the kernel it's moved to 0x100000. Second, there are many ways to switch to protected mode which is necessary to start the kernel. Each BIOS gives you the possibility to use INT15H (AH=89H) to do that. But some memory-managers like 386max does not allow you to use this method. An other way to do the switch is to use DPMI services, but they do not guarantee, that the protected mode application is executed with privilege level 0. Therefore this method is *not* used. VCPI services offer another way to switch to protected mode, and VCPI servers are built into "emm386.exe", "386max" and "qemm". That's why, this method is implemented in fbsdboot.exe. Fbsdboot.exe tries to switch to protected mode using VCPI services. If they're not available INT15H is used to do the switch. If that fails, it's not possible for this version of fbsdboot.exe to boot a kernel :-(. You can get commandline options of fbsdboot if you start it with "-?" as option! I don't know, if fbsdboot works with QEMM, as I don't have the possibility to test it. Enjoy and have fun! Christian. cg@fimp01.fim.uni-linz.ac.at PS: Many thanks to Bruce Evans for his assistance!
100 lines
4.1 KiB
C
100 lines
4.1 KiB
C
/*-
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* Copyright (c) 1982, 1986, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)dkbad.h 8.1 (Berkeley) 6/2/93
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* $Id: dkbad.h,v 1.4 1994/12/11 23:20:50 bde Exp $
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*/
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#ifndef _SYS_DKBAD_H_
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#define _SYS_DKBAD_H_
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/*
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* Definitions needed to perform bad sector revectoring ala DEC STD 144.
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*
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* The bad sector information is located in the first 5 even numbered
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* sectors of the last track of the disk pack. There are five identical
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* copies of the information, described by the dkbad structure.
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*
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* Replacement sectors are allocated starting with the first sector before
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* the bad sector information and working backwards towards the beginning of
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* the disk. A maximum of 126 bad sectors are supported. The position of
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* the bad sector in the bad sector table determines which replacement sector
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* it corresponds to.
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*
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* The bad sector information and replacement sectors are conventionally
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* only accessible through the 'c' file system partition of the disk. If
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* that partition is used for a file system, the user is responsible for
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* making sure that it does not overlap the bad sector information or any
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* replacement sectors.
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*/
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#define DKBAD_MAGIC 0x4321 /* normal value for bt_flag */
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#define DKBAD_MAXBAD 126 /* maximum bad sectors supported */
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#define DKBAD_NOCYL 0xffff /* cylinder to mark end of disk table */
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struct dkbad {
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long bt_csn; /* cartridge serial number */
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u_short bt_mbz; /* unused; should be 0 */
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u_short bt_flag; /* -1 => alignment cartridge */
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struct bt_bad {
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u_short bt_cyl; /* cylinder number of bad sector */
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u_short bt_trksec; /* track and sector number */
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} bt_bad[DKBAD_MAXBAD];
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};
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#define ECC 0
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#define SSE 1
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#define BSE 2
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#define CONT 3
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#ifdef KERNEL
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include <sys/conf.h>
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#define DKBAD_NOSECT (-1) /* sector to mark end of core table */
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struct dkbad_intern {
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daddr_t bi_maxspare; /* last spare sector */
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u_int bi_nbad; /* actual dimension of bi_badsect[] */
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long bi_bad[DKBAD_MAXBAD + 1]; /* actually usually less */
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};
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struct disklabel;
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struct dkbad_intern *internbad144 __P((struct dkbad *btp,
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struct disklabel *lp));
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char *readbad144 __P((dev_t dev, d_strategy_t *strat,
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struct disklabel *lp, struct dkbad *btp));
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daddr_t transbad144 __P((struct dkbad_intern *bip, daddr_t blkno));
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#endif
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#endif /* !_SYS_DKBAD_H_ */
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