distrib/utils/sysinst/mbr.h

   1 /*      $NetBSD: mbr.h,v 1.23 2009/05/14 16:23:38 sborrill Exp $        */
   2
   3 /*
   4  * Copyright 1997, 1988 Piermont Information Systems Inc.
   5  * All rights reserved.
   6  *
   7  * Written by Philip A. Nelson for Piermont Information Systems Inc.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed for the NetBSD Project by
  20  *      Piermont Information Systems Inc.
  21  * 4. The name of Piermont Information Systems Inc. may not be used to endorse
  22  *    or promote products derived from this software without specific prior
  23  *    written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY PIERMONT INFORMATION SYSTEMS INC. ``AS IS''
  26  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED. IN NO EVENT SHALL PIERMONT INFORMATION SYSTEMS INC. BE
  29  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  35  * THE POSSIBILITY OF SUCH DAMAGE.
  36  *
  37  */
  38
  39 #ifndef _MBR_H
  40 #define _MBR_H
  41
  42 /*
  43  * mbr.h -- definitions for reading, writing and editing DOS MBRs.
  44  * Use by including from md.h on ports  which use MBRs (i386, powerpc, arc)
  45  * naming convention:  dlxxxx => NetBSD disklabel, bxxxx => bios
  46  */
  47
  48 /* constants and defines */
  49
  50 #include <sys/bootblock.h>
  51
  52 /*
  53  * XXX  I (dsl) haven't the foggiest idea what the MBR extended chain
  54  *      looks like if the sector size isn't 512.
  55  */
  56 #define MBR_SECSIZE     512
  57
  58 #define MBR_PUT_LSCYL(c)                ((c) & 0xff)
  59 #define MBR_PUT_MSCYLANDSEC(c,s)        (((s) & 0x3f) | (((c) >> 2) & 0xc0))
  60
  61 typedef struct mbr_info_t mbr_info_t;
  62 struct mbr_info_t {
  63         struct mbr_sector       mbr;
  64 #ifdef BOOTSEL
  65         struct mbr_bootsel      mbrb;   /* writeable for any mbr code */
  66         uint            oflags;
  67 #endif
  68         uint            sector;         /* where we read this from */
  69         mbr_info_t      *extended;      /* next in extended partition list */
  70         mbr_info_t      *prev_ext;      /* and back ptr */
  71         const char      *last_mounted[MBR_PART_COUNT];
  72         /* only in first item... */
  73         int             opt;            /* entry being edited */
  74         uint            install;        /* start sector of install partition */
  75 #ifdef BOOTSEL
  76         uint            bootsec;        /* start sector of bootmenu default */
  77 #endif
  78 };
  79
  80 /* incore fdisk (mbr, bios) geometry */
  81 int bcyl, bhead, bsec;
  82
  83 mbr_info_t mbr;
  84
  85 #ifdef BOOTSEL
  86 struct mbr_bootsel *mbs;
  87
  88         /* sync with src/sbin/fdisk/fdisk.c */
  89 #define DEFAULT_BOOTDIR         "/usr/mdec"
  90 #define DEFAULT_BOOTCODE        "mbr"
  91 #define DEFAULT_BOOTSELCODE     "mbr_bootsel"
  92 #define DEFAULT_BOOTEXTCODE     "mbr_ext"
  93
  94 /* Scan values for the various keys we use, as returned by the BIOS */
  95 #define SCAN_ENTER      0x1c
  96 #define SCAN_F1         0x3b
  97 #define SCAN_1          0x2
  98
  99 #endif /* BOOTSEL */
 100
 101 /* from mbr.c */
 102 void    set_fdisk_geom(void);   /* edit incore BIOS geometry */
 103 void    disp_cur_geom(void);
 104 int     check_geom(void);               /* primitive geometry sanity-check */
 105
 106 void    disp_cur_part(struct mbr_partition *, int, int);
 107 int     edit_mbr(mbr_info_t *);
 108 int     mbr_use_wholedisk(mbr_info_t *);
 109 int     partsoverlap(struct mbr_partition *, int, int);
 110
 111 /* from mbr.c */
 112
 113 int     read_mbr(const char *, mbr_info_t *);
 114 int     write_mbr(const char *, mbr_info_t *, int);
 115 int     valid_mbr(struct mbr_sector *);
 116 int     guess_biosgeom_from_mbr(mbr_info_t *, int *, int *, daddr_t *);
 117 int     set_bios_geom_with_mbr_guess(void);
 118 void    set_bios_geom(int, int, int);
 119 int     otherpart(int);
 120 int     ourpart(int);
 121 const char      *get_partname(int);
 122 void    edit_ptn_bounds(void);
 123 #ifdef BOOTSEL
 124 void    disp_bootsel(void);
 125 void    edit_bootsel_entry(int);
 126 void    edit_bootsel_timeout(void);
 127 void    edit_bootsel_default_ptn(int);
 128 void    edit_bootsel_default_disk(int);
 129 void    configure_bootsel(void);
 130 #endif
 131
 132 /* Machine dependant mbr functions */
 133 int     md_mbr_use_wholedisk(mbr_info_t *mbri);
 134 int     md_check_mbr(mbr_info_t *mbri);
 135
 136 #endif