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!
416 lines
14 KiB
C
416 lines
14 KiB
C
/*
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* Copyright (c) 1987, 1988, 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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* @(#)disklabel.h 8.1 (Berkeley) 6/2/93
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* $Id: disklabel.h,v 1.8 1994/11/14 13:08:44 bde Exp $
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*/
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#ifndef _SYS_DISKLABEL_H_
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#define _SYS_DISKLABEL_H_
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/*
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* Disk description table, see disktab(5)
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*/
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#define _PATH_DISKTAB "/etc/disktab"
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#define DISKTAB "/etc/disktab" /* deprecated */
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/*
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* Each disk has a label which includes information about the hardware
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* disk geometry, filesystem partitions, and drive specific information.
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* The label is in block 0 or 1, possibly offset from the beginning
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* to leave room for a bootstrap, etc.
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*/
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/* XXX these should be defined per controller (or drive) elsewhere, not here! */
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#ifdef __i386__
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#define LABELSECTOR 1 /* sector containing label */
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#define LABELOFFSET 0 /* offset of label in sector */
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#define OURPART 2 /* partition is 'all BSD' */
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#define RAWPART 3 /* partition is 'all device' */
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#define readMSPtolabel readMBRtolabel
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#endif
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#ifndef readMSPtolabel
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#define readMSPtolabel(a,b,c,d,e) /* zap calls if irrelevant */
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#endif
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#ifdef tahoe
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#define RAWPART 0
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#endif
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#ifndef RAWPART
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#define RAWPART 2
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#endif
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#ifndef OURPART
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#define OURPART RAWPART /* by default it's all ours */
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#endif
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#ifndef LABELSECTOR
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#define LABELSECTOR 0 /* sector containing label */
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#endif
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#ifndef LABELOFFSET
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#define LABELOFFSET 64 /* offset of label in sector */
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#endif
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#define DISKMAGIC ((u_long) 0x82564557ul) /* The disk magic number */
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#ifndef MAXPARTITIONS
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#define MAXPARTITIONS 8
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#endif
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#ifndef LOCORE
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struct disklabel {
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u_long d_magic; /* the magic number */
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short d_type; /* drive type */
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short d_subtype; /* controller/d_type specific */
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char d_typename[16]; /* type name, e.g. "eagle" */
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/*
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* d_packname contains the pack identifier and is returned when
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* the disklabel is read off the disk or in-core copy.
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* d_boot0 and d_boot1 are the (optional) names of the
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* primary (block 0) and secondary (block 1-15) bootstraps
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* as found in /usr/mdec. These are returned when using
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* getdiskbyname(3) to retrieve the values from /etc/disktab.
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*/
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#if defined(KERNEL) || defined(STANDALONE)
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char d_packname[16]; /* pack identifier */
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#else
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union {
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char un_d_packname[16]; /* pack identifier */
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struct {
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char *un_d_boot0; /* primary bootstrap name */
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char *un_d_boot1; /* secondary bootstrap name */
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} un_b;
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} d_un;
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#define d_packname d_un.un_d_packname
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#define d_boot0 d_un.un_b.un_d_boot0
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#define d_boot1 d_un.un_b.un_d_boot1
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#endif /* ! KERNEL or STANDALONE */
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/* disk geometry: */
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u_long d_secsize; /* # of bytes per sector */
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u_long d_nsectors; /* # of data sectors per track */
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u_long d_ntracks; /* # of tracks per cylinder */
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u_long d_ncylinders; /* # of data cylinders per unit */
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u_long d_secpercyl; /* # of data sectors per cylinder */
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u_long d_secperunit; /* # of data sectors per unit */
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/*
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* Spares (bad sector replacements) below
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* are not counted in d_nsectors or d_secpercyl.
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* Spare sectors are assumed to be physical sectors
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* which occupy space at the end of each track and/or cylinder.
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*/
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u_short d_sparespertrack; /* # of spare sectors per track */
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u_short d_sparespercyl; /* # of spare sectors per cylinder */
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/*
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* Alternate cylinders include maintenance, replacement,
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* configuration description areas, etc.
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*/
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u_long d_acylinders; /* # of alt. cylinders per unit */
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/* hardware characteristics: */
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/*
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* d_interleave, d_trackskew and d_cylskew describe perturbations
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* in the media format used to compensate for a slow controller.
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* Interleave is physical sector interleave, set up by the formatter
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* or controller when formatting. When interleaving is in use,
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* logically adjacent sectors are not physically contiguous,
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* but instead are separated by some number of sectors.
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* It is specified as the ratio of physical sectors traversed
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* per logical sector. Thus an interleave of 1:1 implies contiguous
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* layout, while 2:1 implies that logical sector 0 is separated
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* by one sector from logical sector 1.
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* d_trackskew is the offset of sector 0 on track N
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* relative to sector 0 on track N-1 on the same cylinder.
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* Finally, d_cylskew is the offset of sector 0 on cylinder N
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* relative to sector 0 on cylinder N-1.
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*/
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u_short d_rpm; /* rotational speed */
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u_short d_interleave; /* hardware sector interleave */
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u_short d_trackskew; /* sector 0 skew, per track */
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u_short d_cylskew; /* sector 0 skew, per cylinder */
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u_long d_headswitch; /* head switch time, usec */
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u_long d_trkseek; /* track-to-track seek, usec */
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u_long d_flags; /* generic flags */
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#define NDDATA 5
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u_long d_drivedata[NDDATA]; /* drive-type specific information */
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#define NSPARE 5
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u_long d_spare[NSPARE]; /* reserved for future use */
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u_long d_magic2; /* the magic number (again) */
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u_short d_checksum; /* xor of data incl. partitions */
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/* filesystem and partition information: */
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u_short d_npartitions; /* number of partitions in following */
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u_long d_bbsize; /* size of boot area at sn0, bytes */
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u_long d_sbsize; /* max size of fs superblock, bytes */
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struct partition { /* the partition table */
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u_long p_size; /* number of sectors in partition */
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u_long p_offset; /* starting sector */
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u_long p_fsize; /* filesystem basic fragment size */
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u_char p_fstype; /* filesystem type, see below */
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u_char p_frag; /* filesystem fragments per block */
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union {
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u_short cpg; /* UFS: FS cylinders per group */
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u_short sgs; /* LFS: FS segment shift */
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} __partition_u1;
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#define p_cpg __partition_u1.cpg
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#define p_sgs __partition_u1.sgs
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} d_partitions[MAXPARTITIONS]; /* actually may be more */
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};
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/*
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struct cpu_disklabel {
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};
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*/
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#else /* LOCORE */
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/*
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* offsets for asm boot files.
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*/
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.set d_secsize,40
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.set d_nsectors,44
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.set d_ntracks,48
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.set d_ncylinders,52
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.set d_secpercyl,56
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.set d_secperunit,60
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.set d_end_,276 /* size of disk label */
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#endif /* LOCORE */
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/* d_type values: */
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#define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */
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#define DTYPE_MSCP 2 /* MSCP */
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#define DTYPE_DEC 3 /* other DEC (rk, rl) */
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#define DTYPE_SCSI 4 /* SCSI */
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#define DTYPE_ESDI 5 /* ESDI interface */
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#define DTYPE_ST506 6 /* ST506 etc. */
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#define DTYPE_HPIB 7 /* CS/80 on HP-IB */
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#define DTYPE_HPFL 8 /* HP Fiber-link */
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#define DTYPE_FLOPPY 10 /* floppy */
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/* d_subtype values: */
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#define DSTYPE_INDOSPART 0x8 /* is inside dos partition */
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#define DSTYPE_DOSPART(s) ((s) & 3) /* dos partition number */
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#define DSTYPE_GEOMETRY 0x10 /* drive params in label */
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#ifdef DKTYPENAMES
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static char *dktypenames[] = {
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"unknown",
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"SMD",
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"MSCP",
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"old DEC",
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"SCSI",
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"ESDI",
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"ST506",
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"HP-IB",
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"HP-FL",
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"type 9",
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"floppy",
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0
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};
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#define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1)
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#endif
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/*
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* Filesystem type and version.
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* Used to interpret other filesystem-specific
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* per-partition information.
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*/
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#define FS_UNUSED 0 /* unused */
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#define FS_SWAP 1 /* swap */
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#define FS_V6 2 /* Sixth Edition */
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#define FS_V7 3 /* Seventh Edition */
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#define FS_SYSV 4 /* System V */
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#define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */
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#define FS_V8 6 /* Eighth Edition, 4K blocks */
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#define FS_BSDFFS 7 /* 4.2BSD fast file system */
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#define FS_MSDOS 8 /* MSDOS file system */
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#define FS_BSDLFS 9 /* 4.4BSD log-structured file system */
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#define FS_OTHER 10 /* in use, but unknown/unsupported */
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#define FS_HPFS 11 /* OS/2 high-performance file system */
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#define FS_ISO9660 12 /* ISO 9660, normally CD-ROM */
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#define FS_BOOT 13 /* partition contains bootstrap */
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#ifdef DKTYPENAMES
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static char *fstypenames[] = {
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"unused",
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"swap",
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"Version 6",
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"Version 7",
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"System V",
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"4.1BSD",
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"Eighth Edition",
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"4.2BSD",
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"MSDOS",
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"4.4LFS",
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"unknown",
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"HPFS",
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"ISO9660",
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"boot",
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0
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};
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#define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1)
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#endif
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/*
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* flags shared by various drives:
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*/
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#define D_REMOVABLE 0x01 /* removable media */
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#define D_ECC 0x02 /* supports ECC */
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#define D_BADSECT 0x04 /* supports bad sector forw. */
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#define D_RAMDISK 0x08 /* disk emulator */
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#define D_CHAIN 0x10 /* can do back-back transfers */
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/*
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* Drive data for SMD.
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*/
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#define d_smdflags d_drivedata[0]
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#define D_SSE 0x1 /* supports skip sectoring */
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#define d_mindist d_drivedata[1]
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#define d_maxdist d_drivedata[2]
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#define d_sdist d_drivedata[3]
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/*
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* Drive data for ST506.
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*/
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#define d_precompcyl d_drivedata[0]
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#define d_gap3 d_drivedata[1] /* used only when formatting */
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/*
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* Drive data for SCSI.
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*/
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#define d_blind d_drivedata[0]
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#ifndef LOCORE
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/*
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* Structure used to perform a format
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* or other raw operation, returning data
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* and/or register values.
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* Register identification and format
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* are device- and driver-dependent.
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*/
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struct format_op {
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char *df_buf;
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long df_count; /* value-result */
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daddr_t df_startblk;
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long df_reg[8]; /* result */
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};
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/*
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* Structure used internally to retrieve
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* information about a partition on a disk.
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*/
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struct partinfo {
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struct disklabel *disklab;
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struct partition *part;
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};
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/* DOS partition table -- located in boot block */
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#define DOSBBSECTOR 0 /* DOS boot block relative sector number */
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#define DOSPARTOFF 446
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#define NDOSPART 4
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#define DOSPTYP_386BSD 0xa5 /* 386BSD partition type */
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#define MBR_PTYPE_FreeBSD 0xa5 /* FreeBSD partition type */
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struct dos_partition {
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unsigned char dp_flag; /* bootstrap flags */
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unsigned char dp_shd; /* starting head */
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unsigned char dp_ssect; /* starting sector */
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unsigned char dp_scyl; /* starting cylinder */
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unsigned char dp_typ; /* partition type */
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unsigned char dp_ehd; /* end head */
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unsigned char dp_esect; /* end sector */
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unsigned char dp_ecyl; /* end cylinder */
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unsigned long dp_start; /* absolute starting sector number */
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unsigned long dp_size; /* partition size in sectors */
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};
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extern struct dos_partition dos_partitions[NDOSPART];
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#define DPSECT(s) ((s) & 0x3f) /* isolate relevant bits of sector */
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#define DPCYL(c, s) ((c) + (((s) & 0xc0)<<2)) /* and those that are cylinder */
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/*
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* Disk-specific ioctls.
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*/
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/* get and set disklabel; DIOCGPART used internally */
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#define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */
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#define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */
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#define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */
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#define DIOCGPART _IOW('d', 104, struct partinfo) /* get partition */
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/* do format operation, read or write */
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#define DIOCRFORMAT _IOWR('d', 105, struct format_op)
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#define DIOCWFORMAT _IOWR('d', 106, struct format_op)
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#define DIOCSSTEP _IOW('d', 107, int) /* set step rate */
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#define DIOCSRETRIES _IOW('d', 108, int) /* set # of retries */
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#define DIOCWLABEL _IOW('d', 109, int) /* write en/disable label */
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#define DIOCSBAD _IOW('d', 110, struct dkbad) /* set kernel dkbad */
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#endif /* LOCORE */
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#ifdef KERNEL
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struct dkbad;
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u_int dkcksum __P((struct disklabel *));
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int writedisklabel __P((dev_t dev, void (*strat)(), struct disklabel *lp));
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char * readdisklabel __P((dev_t dev, void (*strat)(), struct disklabel *lp, struct dos_partition *dp, struct dkbad *bdp));
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int setdisklabel __P((struct disklabel *olp, struct disklabel *nlp, u_long openmask));
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void disksort __P((struct buf *ap, struct buf *bp));
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void diskerr __P((struct buf *, char *, char *, int, int, struct disklabel *));
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#ifdef __i386
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char * readMBRtolabel __P(( dev_t dev , void (*strat)(), register struct disklabel *lp, struct dos_partition *dp, int *cyl));
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#endif
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#endif
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#if !defined(KERNEL) && !defined(LOCORE)
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#include "cdefs.h"
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__BEGIN_DECLS
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struct disklabel *getdiskbyname __P((const char *));
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__END_DECLS
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#endif
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#ifdef __i386
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/* encoding of disk minor numbers, should be elsewhere... */
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#define dkunit(dev) (minor(dev) >> 3)
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#define dkpart(dev) (minor(dev) & 07)
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#define dkminor(unit, part) (((unit) << 3) | (part))
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#endif
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#endif
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