sys/sys/disklabel32.h

   1 /*
   2  * Copyright (c) 1987, 1988, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  *      @(#)disklabel.h 8.2 (Berkeley) 7/10/94
  30  * $FreeBSD: src/sys/sys/disklabel.h,v 1.49.2.7 2001/05/27 05:58:26 jkh Exp $
  31  * $DragonFly: src/sys/sys/disklabel32.h,v 1.28 2007/08/21 20:04:09 corecode Exp $
  32  */
  33
  34 #ifndef _SYS_DISKLABEL32_H_
  35 #define _SYS_DISKLABEL32_H_
  36
  37 #ifndef _SYS_TYPES_H_
  38 #include <sys/types.h>
  39 #endif
  40 #if defined(_KERNEL) && !defined(_SYS_SYSTM_H_)
  41 #include <sys/systm.h>
  42 #endif
  43 #ifndef _SYS_IOCCOM_H_
  44 #include <sys/ioccom.h>
  45 #endif
  46
  47 /*
  48  * Each disk has a label which includes information about the hardware
  49  * disk geometry, filesystem partitions, and drive specific information.
  50  * The label is in block 0 or 1, possibly offset from the beginning
  51  * to leave room for a bootstrap, etc.
  52  */
  53
  54 /* XXX these should be defined per controller (or drive) elsewhere, not here! */
  55 #if defined(__i386__) || defined(__x86_64__)
  56 #define LABELSECTOR32   1                       /* sector containing label */
  57 #define LABELOFFSET32   0                       /* offset of label in sector */
  58 #endif
  59
  60 #define DISKMAGIC32     ((u_int32_t)0x82564557) /* The disk magic number */
  61 #ifndef MAXPARTITIONS32
  62 #define MAXPARTITIONS32 16
  63 #endif
  64
  65 #define LABEL_PART      2               /* partition containing label */
  66 #define RAW_PART        2               /* partition containing whole disk */
  67 #define SWAP_PART       1               /* partition normally containing swap */
  68
  69 #ifndef LOCORE
  70 struct disklabel32 {
  71         u_int32_t d_magic;              /* the magic number */
  72         u_int16_t d_type;               /* drive type */
  73         u_int16_t d_subtype;            /* controller/d_type specific */
  74         char      d_typename[16];       /* type name, e.g. "eagle" */
  75
  76         char    d_packname[16];         /* pack identifier */
  77
  78         /* disk geometry: */
  79         u_int32_t d_secsize;            /* # of bytes per sector */
  80         u_int32_t d_nsectors;           /* # of data sectors per track */
  81         u_int32_t d_ntracks;            /* # of tracks per cylinder */
  82         u_int32_t d_ncylinders;         /* # of data cylinders per unit */
  83         u_int32_t d_secpercyl;          /* # of data sectors per cylinder */
  84         u_int32_t d_secperunit;         /* # of data sectors per unit */
  85
  86         /*
  87          * Spares (bad sector replacements) below are not counted in
  88          * d_nsectors or d_secpercyl.  Spare sectors are assumed to
  89          * be physical sectors which occupy space at the end of each
  90          * track and/or cylinder.
  91          */
  92         u_int16_t d_sparespertrack;     /* # of spare sectors per track */
  93         u_int16_t d_sparespercyl;       /* # of spare sectors per cylinder */
  94         /*
  95          * Alternate cylinders include maintenance, replacement, configuration
  96          * description areas, etc.
  97          */
  98         u_int32_t d_acylinders;         /* # of alt. cylinders per unit */
  99
 100                         /* hardware characteristics: */
 101         /*
 102          * d_interleave, d_trackskew and d_cylskew describe perturbations
 103          * in the media format used to compensate for a slow controller.
 104          * Interleave is physical sector interleave, set up by the
 105          * formatter or controller when formatting.  When interleaving is
 106          * in use, logically adjacent sectors are not physically
 107          * contiguous, but instead are separated by some number of
 108          * sectors.  It is specified as the ratio of physical sectors
 109          * traversed per logical sector.  Thus an interleave of 1:1
 110          * implies contiguous layout, while 2:1 implies that logical
 111          * sector 0 is separated by one sector from logical sector 1.
 112          * d_trackskew is the offset of sector 0 on track N relative to
 113          * sector 0 on track N-1 on the same cylinder.  Finally, d_cylskew
 114          * is the offset of sector 0 on cylinder N relative to sector 0
 115          * on cylinder N-1.
 116          */
 117         u_int16_t d_rpm;                /* rotational speed */
 118         u_int16_t d_interleave;         /* hardware sector interleave */
 119         u_int16_t d_trackskew;          /* sector 0 skew, per track */
 120         u_int16_t d_cylskew;            /* sector 0 skew, per cylinder */
 121         u_int32_t d_headswitch;         /* head switch time, usec */
 122         u_int32_t d_trkseek;            /* track-to-track seek, usec */
 123         u_int32_t d_flags;              /* generic flags (now unused) */
 124 #define NDDATA32 5
 125         u_int32_t d_drivedata[NDDATA32];/* drive-type specific information */
 126 #define NSPARE32 5
 127         u_int32_t d_spare[NSPARE32];    /* reserved for future use */
 128         u_int32_t d_magic2;             /* the magic number (again) */
 129         u_int16_t d_checksum;           /* xor of data incl. partitions */
 130
 131                         /* filesystem and partition information: */
 132         u_int16_t d_npartitions;        /* number of partitions in following */
 133         u_int32_t d_bbsize;             /* size of boot area at sn0, bytes */
 134         u_int32_t d_sbsize;             /* max size of fs superblock, bytes */
 135         struct  partition32 {           /* the partition table */
 136                 u_int32_t p_size;       /* number of sectors in partition */
 137                 u_int32_t p_offset;     /* starting sector */
 138                 u_int32_t p_fsize;      /* filesystem basic fragment size */
 139                 u_int8_t p_fstype;      /* filesystem type, see below */
 140                 u_int8_t p_frag;        /* filesystem fragments per block */
 141                 union {
 142                         u_int16_t cpg;  /* UFS: FS cylinders per group */
 143                         u_int16_t sgs;  /* LFS: FS segment shift */
 144                 } __partition_u1;
 145 #define p_cpg   __partition_u1.cpg
 146 #define p_sgs   __partition_u1.sgs
 147         } d_partitions[MAXPARTITIONS32];/* actually may be more */
 148 };
 149
 150 static u_int16_t dkcksum32(struct disklabel32 *lp);
 151
 152 static __inline u_int16_t
 153 dkcksum32(struct disklabel32 *lp)
 154 {
 155         u_int16_t *start, *end;
 156         u_int16_t sum = 0;
 157
 158         start = (u_int16_t *)lp;
 159         end = (u_int16_t *)&lp->d_partitions[lp->d_npartitions];
 160         while (start < end)
 161                 sum ^= *start++;
 162         return (sum);
 163 }
 164
 165 #ifdef _KERNEL
 166 extern struct disklabel_ops disklabel32_ops;
 167 #endif
 168
 169 #else /* LOCORE */
 170         /*
 171          * offsets for asm boot files.
 172          */
 173         .set    d_secsize,40
 174         .set    d_nsectors,44
 175         .set    d_ntracks,48
 176         .set    d_ncylinders,52
 177         .set    d_secpercyl,56
 178         .set    d_secperunit,60
 179         .set    d_end_,276              /* size of disk label */
 180 #endif /* LOCORE */
 181
 182 #ifndef LOCORE
 183
 184 /*
 185  * Disk-specific ioctls.
 186  */
 187 #define DIOCGDINFO32    _IOR('d', 101, struct disklabel32) /* get */
 188 #define DIOCSDINFO32    _IOW('d', 102, struct disklabel32) /* set */
 189 #define DIOCWDINFO32    _IOW('d', 103, struct disklabel32) /* set, update disk */
 190 #define DIOCGDVIRGIN32  _IOR('d', 105, struct disklabel32) /* get virgin label */
 191
 192 #endif /* LOCORE */
 193
 194 #endif /* !_SYS_DISKLABEL32_H_ */