1c33b4e6a4
<sys/bootblock.h>:
* Added definitions for the Master Boot Record (MBR) used by
a variety of systems (primarily i386), including the format
of the BIOS Parameter Block (BPB).
This information was cribbed from a variety of sources
including <sys/disklabel_mbr.h> which this is a superset of.
As part of this, some data structure elements and #defines
were renamed to be more "namespace friendly" and consistent
with other bootblocks and MBR documentation.
Update all uses of the old names to the new names.
<sys/disklabel_mbr.h>:
* Deprecated in favor of <sys/bootblock.h> (the latter is more
"host tool" friendly).
amd64 & i386:
* Renamed /usr/mdec/bootxx_dosfs to /usr/mdec/bootxx_msdos, to
be consistent with the naming convention of the msdosfs tools.
* Removed /usr/mdec/bootxx_ufs, as it's equivalent to bootxx_ffsv1
and it's confusing to have two functionally equivalent bootblocks,
especially given that "ufs" has multiple meanings (it could be
a synonym for "ffs", or the group of ffs/lfs/ext2fs file systems).
* Rework pbr.S (the first sector of bootxx_*):
+ Ensure that BPB (bytes 11..89) and the partition table
(bytes 446..509) do not contain code.
+ Add support for booting from FAT partitions if BOOT_FROM_FAT
is defined. (Only set for bootxx_msdos).
+ Remove "dummy" partition 3; if people want to installboot(8)
these to the start of the disk they can use fdisk(8) to
create a real MBR partition table...
+ Compile with TERSE_ERROR so it fits because of the above.
Whilst this is less user friendly, I feel it's important
to have a valid partition table and BPB in the MBR/PBR.
* Renamed /usr/mdec/biosboot to /usr/mdec/boot, to be consistent
with other platforms.
* Enable SUPPORT_DOSFS in /usr/mdec/boot (stage2), so that
we can boot off FAT partitions.
* Crank version of /usr/mdec/boot to 3.1, and fix some of the other
entries in the version file.
installboot(8) (i386):
* Read the existing MBR of the filesystem and retain the BIOS
Parameter Block (BPB) in bytes 11..89 and the MBR partition
table in bytes 446..509. (Previously installboot(8) would
trash those two sections of the MBR.)
mbrlabel(8):
* Use sys/lib/libkern/xlat_mbr_fstype.c instead of homegrown code
to map the MBR partition type to the NetBSD disklabel type.
Test built "make release" for i386, and new bootblocks verified to work
(even off FAT!).
131 lines
4.4 KiB
C
131 lines
4.4 KiB
C
/* $NetBSD: mbr.h,v 1.18 2003/10/08 04:25:44 lukem Exp $ */
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/*
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* Copyright 1997, 1988 Piermont Information Systems Inc.
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* All rights reserved.
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*
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* Written by Philip A. Nelson for Piermont Information Systems Inc.
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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 for the NetBSD Project by
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* Piermont Information Systems Inc.
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* 4. The name of Piermont Information Systems Inc. may not be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY PIERMONT INFORMATION SYSTEMS INC. ``AS IS''
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* AND 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 PIERMONT INFORMATION SYSTEMS INC. BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef _MBR_H
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#define _MBR_H
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/*
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* mbr.h -- definitions for reading, writing and editing DOS MBRs.
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* Use by including from md.h on ports which use MBRs (i386, powerpc, arc)
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* naming convention: dlxxxx => NetBSD disklabel, bxxxx => bios
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*/
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/* constants and defines */
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#include <sys/bootblock.h>
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/*
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* XXX I (dsl) haven't the foggiest idea what the MBR extended chain
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* looks like if the sector size isn't 512.
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*/
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#define MBR_SECSIZE 512
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#define MBR_PUT_LSCYL(c) ((c) & 0xff)
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#define MBR_PUT_MSCYLANDSEC(c,s) (((s) & 0x3f) | (((c) >> 2) & 0xc0))
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typedef struct mbr_info_t mbr_info_t;
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struct mbr_info_t {
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struct mbr_sector mbr;
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#ifdef BOOTSEL
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char nametab[MBR_PART_COUNT][MBR_BS_PARTNAMESIZE + 1];
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#endif
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uint sector; /* where we read this from */
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mbr_info_t *extended; /* next in extended partition list */
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mbr_info_t *prev_ext; /* and back ptr */
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const char *last_mounted[MBR_PART_COUNT];
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/* only in first item... */
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int opt; /* entry being edited */
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uint install; /* start sector of install partition */
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#ifdef BOOTSEL
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uint bootsec; /* start sector of bootmenu default */
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#endif
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};
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/* incore fdisk (mbr, bios) geometry */
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EXTERN int bcyl, bhead, bsec, bsize, bcylsize;
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EXTERN mbr_info_t mbr;
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#ifdef BOOTSEL
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struct mbr_bootsel *mbs;
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/* sync with src/sbin/fdisk/fdisk.c */
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#define DEFAULT_BOOTDIR "/usr/mdec"
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#define DEFAULT_BOOTCODE "mbr"
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#define DEFAULT_BOOTSELCODE "mbr_bootsel"
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#define DEFAULT_BOOTEXTCODE "mbr_ext"
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/* Scan values for the various keys we use, as returned by the BIOS */
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#define SCAN_ENTER 0x1c
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#define SCAN_F1 0x3b
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#define SCAN_1 0x2
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#endif /* BOOTSEL */
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/* from mbr.c */
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void set_fdisk_geom(void); /* edit incore BIOS geometry */
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void disp_cur_geom(void);
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int check_geom(void); /* primitive geometry sanity-check */
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void disp_cur_part(struct mbr_partition *, int, int);
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int edit_mbr(mbr_info_t *);
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int partsoverlap(struct mbr_partition *, int, int);
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/* from mbr.c */
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int read_mbr(const char *, mbr_info_t *);
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int write_mbr(const char *, mbr_info_t *, int);
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int valid_mbr(struct mbr_sector *);
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int guess_biosgeom_from_mbr(mbr_info_t *, int *, int *, int *);
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int md_bios_info(char *);
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void set_bios_geom(int, int, int);
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int otherpart(int);
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int ourpart(int);
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const char *get_partname(int);
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void edit_ptn_bounds(void);
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#ifdef BOOTSEL
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void disp_bootsel(void);
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void edit_bootsel_entry(int);
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void edit_bootsel_timeout(void);
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void edit_bootsel_default_ptn(int);
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void edit_bootsel_default_disk(int);
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void configure_bootsel(void);
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#endif
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#endif
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