FreeBSD/Linux Kernel Cross Reference
sys/sys/disklabel32.h

     /*
      * Copyright (c) 1987, 1988, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)disklabel.h 8.2 (Berkeley) 7/10/94
     * $FreeBSD: src/sys/sys/disklabel.h,v 1.49.2.7 2001/05/27 05:58:26 jkh Exp $
     * $DragonFly: src/sys/sys/disklabel32.h,v 1.28 2007/08/21 20:04:09 corecode Exp $
     */
    
    #ifndef _SYS_DISKLABEL32_H_
    #define _SYS_DISKLABEL32_H_
    
    #ifndef _SYS_TYPES_H_
    #include <sys/types.h>
    #endif
    #if defined(_KERNEL) && !defined(_SYS_SYSTM_H_)
    #include <sys/systm.h>
    #endif
    #ifndef _SYS_IOCCOM_H_
    #include <sys/ioccom.h>
    #endif
    
    /*
     * Each disk has a label which includes information about the hardware
     * disk geometry, filesystem partitions, and drive specific information.
     * The label is in block 0 or 1, possibly offset from the beginning
     * to leave room for a bootstrap, etc.
     */
    
    /* XXX these should be defined per controller (or drive) elsewhere, not here! */
    #if defined(__i386__) || defined(__x86_64__) 
    #define LABELSECTOR32   1                       /* sector containing label */
    #define LABELOFFSET32   0                       /* offset of label in sector */
    #endif
    
    #define DISKMAGIC32     ((u_int32_t)0x82564557) /* The disk magic number */
    #ifndef MAXPARTITIONS32
    #define MAXPARTITIONS32 16
    #endif
    
    #define LABEL_PART      2               /* partition containing label */
    #define RAW_PART        2               /* partition containing whole disk */
    #define SWAP_PART       1               /* partition normally containing swap */
    
    #ifndef LOCORE
    struct disklabel32 {
            u_int32_t d_magic;              /* the magic number */
            u_int16_t d_type;               /* drive type */
            u_int16_t d_subtype;            /* controller/d_type specific */
            char      d_typename[16];       /* type name, e.g. "eagle" */
    
            char    d_packname[16];         /* pack identifier */
    
            /* disk geometry: */
            u_int32_t d_secsize;            /* # of bytes per sector */
            u_int32_t d_nsectors;           /* # of data sectors per track */
            u_int32_t d_ntracks;            /* # of tracks per cylinder */
            u_int32_t d_ncylinders;         /* # of data cylinders per unit */
            u_int32_t d_secpercyl;          /* # of data sectors per cylinder */
            u_int32_t d_secperunit;         /* # of data sectors per unit */
    
            /*
             * Spares (bad sector replacements) below are not counted in
             * d_nsectors or d_secpercyl.  Spare sectors are assumed to
             * be physical sectors which occupy space at the end of each
             * track and/or cylinder.
             */
            u_int16_t d_sparespertrack;     /* # of spare sectors per track */
            u_int16_t d_sparespercyl;       /* # of spare sectors per cylinder */
            /*
             * Alternate cylinders include maintenance, replacement, configuration
            * description areas, etc.
            */
           u_int32_t d_acylinders;         /* # of alt. cylinders per unit */
   
                           /* hardware characteristics: */
           /*
            * d_interleave, d_trackskew and d_cylskew describe perturbations
            * in the media format used to compensate for a slow controller.
            * Interleave is physical sector interleave, set up by the
            * formatter or controller when formatting.  When interleaving is
            * in use, logically adjacent sectors are not physically
            * contiguous, but instead are separated by some number of
            * sectors.  It is specified as the ratio of physical sectors
            * traversed per logical sector.  Thus an interleave of 1:1
            * implies contiguous layout, while 2:1 implies that logical
            * sector 0 is separated by one sector from logical sector 1.
            * d_trackskew is the offset of sector 0 on track N relative to
            * sector 0 on track N-1 on the same cylinder.  Finally, d_cylskew
            * is the offset of sector 0 on cylinder N relative to sector 0
            * on cylinder N-1.
            */
           u_int16_t d_rpm;                /* rotational speed */
           u_int16_t d_interleave;         /* hardware sector interleave */
           u_int16_t d_trackskew;          /* sector 0 skew, per track */
           u_int16_t d_cylskew;            /* sector 0 skew, per cylinder */
           u_int32_t d_headswitch;         /* head switch time, usec */
           u_int32_t d_trkseek;            /* track-to-track seek, usec */
           u_int32_t d_flags;              /* generic flags (now unused) */
   #define NDDATA32 5
           u_int32_t d_drivedata[NDDATA32];/* drive-type specific information */
   #define NSPARE32 5
           u_int32_t d_spare[NSPARE32];    /* reserved for future use */
           u_int32_t d_magic2;             /* the magic number (again) */
           u_int16_t d_checksum;           /* xor of data incl. partitions */
   
                           /* filesystem and partition information: */
           u_int16_t d_npartitions;        /* number of partitions in following */
           u_int32_t d_bbsize;             /* size of boot area at sn0, bytes */
           u_int32_t d_sbsize;             /* max size of fs superblock, bytes */
           struct  partition32 {           /* the partition table */
                   u_int32_t p_size;       /* number of sectors in partition */
                   u_int32_t p_offset;     /* starting sector */
                   u_int32_t p_fsize;      /* filesystem basic fragment size */
                   u_int8_t p_fstype;      /* filesystem type, see below */
                   u_int8_t p_frag;        /* filesystem fragments per block */
                   union {
                           u_int16_t cpg;  /* UFS: FS cylinders per group */
                           u_int16_t sgs;  /* LFS: FS segment shift */
                   } __partition_u1;
   #define p_cpg   __partition_u1.cpg
   #define p_sgs   __partition_u1.sgs
           } d_partitions[MAXPARTITIONS32];/* actually may be more */
   };
   
   static u_int16_t dkcksum32(struct disklabel32 *lp);
   
   static __inline u_int16_t
   dkcksum32(struct disklabel32 *lp)
   {
           u_int16_t *start, *end;
           u_int16_t sum = 0;
   
           start = (u_int16_t *)lp;
           end = (u_int16_t *)&lp->d_partitions[lp->d_npartitions];
           while (start < end)
                   sum ^= *start++;
           return (sum);
   }
   
   #ifdef _KERNEL
   extern struct disklabel_ops disklabel32_ops;
   #endif
   
   #else /* LOCORE */
           /*
            * offsets for asm boot files.
            */
           .set    d_secsize,40
           .set    d_nsectors,44
           .set    d_ntracks,48
           .set    d_ncylinders,52
           .set    d_secpercyl,56
           .set    d_secperunit,60
           .set    d_end_,276              /* size of disk label */
   #endif /* LOCORE */
   
   #ifndef LOCORE
   
   /*
    * Disk-specific ioctls.
    */
   #define DIOCGDINFO32    _IOR('d', 101, struct disklabel32) /* get */
   #define DIOCSDINFO32    _IOW('d', 102, struct disklabel32) /* set */
   #define DIOCWDINFO32    _IOW('d', 103, struct disklabel32) /* set, update disk */
   #define DIOCGDVIRGIN32  _IOR('d', 105, struct disklabel32) /* get virgin label */
   
   #endif /* LOCORE */
   
   #endif /* !_SYS_DISKLABEL32_H_ */

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