sys/arch/atari/stand/tostools/libtos/disklbl.h

   1 /*      $NetBSD: disklbl.h,v 1.1.14.3 2004/09/21 13:14:11 skrll Exp $   */
   2
   3 /*
   4  * Copyright (c) 1987, 1988, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  *      @(#)disklabel.h 8.2 (Berkeley) 7/10/94
  32  */
  33
  34 #ifndef DISKLABEL_H
  35 #define DISKLABEL_H
  36
  37 #define DISKMAGIC       ((u_int32_t)0x82564557) /* The disk magic number */
  38
  39 struct disklabel {
  40         u_int32_t d_magic;              /* the magic number */
  41         u_int16_t d_type;               /* drive type */
  42         u_int16_t d_subtype;            /* controller/d_type specific */
  43         char      d_typename[16];       /* type name, e.g. "eagle" */
  44
  45         /*
  46          * d_packname contains the pack identifier and is returned when
  47          * the disklabel is read off the disk or in-core copy.
  48          * d_boot0 and d_boot1 are the (optional) names of the
  49          * primary (block 0) and secondary (block 1-15) bootstraps
  50          * as found in /usr/mdec.  These are returned when using
  51          * getdiskbyname(3) to retrieve the values from /etc/disktab.
  52          */
  53         union {
  54                 char    un_d_packname[16];      /* pack identifier */
  55                 struct {
  56                         char *un_d_boot0;       /* primary bootstrap name */
  57                         char *un_d_boot1;       /* secondary bootstrap name */
  58                 } un_b;
  59         } d_un;
  60 #define d_packname      d_un.un_d_packname
  61 #define d_boot0         d_un.un_b.un_d_boot0
  62 #define d_boot1         d_un.un_b.un_d_boot1
  63
  64                         /* disk geometry: */
  65         u_int32_t d_secsize;            /* # of bytes per sector */
  66         u_int32_t d_nsectors;           /* # of data sectors per track */
  67         u_int32_t d_ntracks;            /* # of tracks per cylinder */
  68         u_int32_t d_ncylinders;         /* # of data cylinders per unit */
  69         u_int32_t d_secpercyl;          /* # of data sectors per cylinder */
  70         u_int32_t d_secperunit;         /* # of data sectors per unit */
  71
  72         /*
  73          * Spares (bad sector replacements) below are not counted in
  74          * d_nsectors or d_secpercyl.  Spare sectors are assumed to
  75          * be physical sectors which occupy space at the end of each
  76          * track and/or cylinder.
  77          */
  78         u_int16_t d_sparespertrack;     /* # of spare sectors per track */
  79         u_int16_t d_sparespercyl;       /* # of spare sectors per cylinder */
  80         /*
  81          * Alternate cylinders include maintenance, replacement, configuration
  82          * description areas, etc.
  83          */
  84         u_int32_t d_acylinders;         /* # of alt. cylinders per unit */
  85
  86                         /* hardware characteristics: */
  87         /*
  88          * d_interleave, d_trackskew and d_cylskew describe perturbations
  89          * in the media format used to compensate for a slow controller.
  90          * Interleave is physical sector interleave, set up by the
  91          * formatter or controller when formatting.  When interleaving is
  92          * in use, logically adjacent sectors are not physically
  93          * contiguous, but instead are separated by some number of
  94          * sectors.  It is specified as the ratio of physical sectors
  95          * traversed per logical sector.  Thus an interleave of 1:1
  96          * implies contiguous layout, while 2:1 implies that logical
  97          * sector 0 is separated by one sector from logical sector 1.
  98          * d_trackskew is the offset of sector 0 on track N relative to
  99          * sector 0 on track N-1 on the same cylinder.  Finally, d_cylskew
 100          * is the offset of sector 0 on cylinder N relative to sector 0
 101          * on cylinder N-1.
 102          */
 103         u_int16_t d_rpm;                /* rotational speed */
 104         u_int16_t d_interleave;         /* hardware sector interleave */
 105         u_int16_t d_trackskew;          /* sector 0 skew, per track */
 106         u_int16_t d_cylskew;            /* sector 0 skew, per cylinder */
 107         u_int32_t d_headswitch;         /* head switch time, usec */
 108         u_int32_t d_trkseek;            /* track-to-track seek, usec */
 109         u_int32_t d_flags;              /* generic flags */
 110 #define NDDATA 5
 111         u_int32_t d_drivedata[NDDATA];  /* drive-type specific information */
 112 #define NSPARE 5
 113         u_int32_t d_spare[NSPARE];      /* reserved for future use */
 114         u_int32_t d_magic2;             /* the magic number (again) */
 115         u_int16_t d_checksum;           /* xor of data incl. partitions */
 116
 117                         /* filesystem and partition information: */
 118         u_int16_t d_npartitions;        /* number of partitions in following */
 119         u_int32_t d_bbsize;             /* size of boot area at sn0, bytes */
 120         u_int32_t d_sbsize;             /* max size of fs superblock, bytes */
 121         struct  partition {             /* the partition table */
 122                 u_int32_t p_size;       /* number of sectors in partition */
 123                 u_int32_t p_offset;     /* starting sector */
 124                 u_int32_t p_fsize;      /* filesystem basic fragment size */
 125                 u_int8_t p_fstype;      /* filesystem type, see below */
 126                 u_int8_t p_frag;        /* filesystem fragments per block */
 127                 union {
 128                         u_int16_t cpg;  /* UFS: FS cylinders per group */
 129                         u_int16_t sgs;  /* LFS: FS segment shift */
 130                 } __partition_u1;
 131 #define p_cpg   __partition_u1.cpg
 132 #define p_sgs   __partition_u1.sgs
 133         } d_partitions[MAXPARTITIONS];  /* actually may be more */
 134 };
 135
 136 #endif /* DISKLABEL_H */