sunlabel.h

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/* @(#)sunlabel.h   1.5 03/12/28 Copyright 1999-2003 J. Schilling */
/*
 *  Support for Sun disk label
 *
 *  Copyright (c) 1999-2003 J. Schilling
 */
/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; see the file COPYING.  If not, write to the Free Software
 * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */
 
#ifndef howmany
#define howmany(x, y)   (((x)+((y)-1))/(y))
#endif
#ifndef roundup
#define roundup(x, y)   ((((x)+((y)-1))/(y))*(y))
#endif
 
#define NDKMAP      8       /* # of sparc partitions */
#define NX86MAP     16      /* # if x86   partitions */
#define DKL_MAGIC   0xDABE      /* magic number */
#define DKL_MAGIC_0 0xDA        /* magic number high byte */
#define DKL_MAGIC_1 0xBE        /* magic number low byte  */
 
#define CD_DEFLABEL "CD-ROM Disc with Sun sparc boot created by mkisofs"
#define CD_X86LABEL "CD-ROM Disc with Sun x86 boot created by mkisofs"
 
/*
 * Define a virtual geometry for the CD disk label.
 * The current values are stolen from Sun install disks and do not seem to be
 * a good idea as they limit the size of the CD to 327680 sectors which is less
 * than 74 minutes.
 * There are 84 minute CD's with 378000 sectors and there will be DVD's with
 * even more.
 */
#define CD_RPM      350
#define CD_PCYL     2048
#define CD_APC      0
#define CD_INTRLV   1
#define CD_NCYL     2048
#define CD_ACYL     0
#define CD_NHEAD    1
#define CD_NSECT    640
 
/*
 * NOTE: The virtual cylinder size on CD must be a mutiple of 2048.
 *   This is true if CD_NSECT is a multiple of 4.
 */
#define CD_CYLSIZE  (CD_NSECT*CD_NHEAD*512)
 
#define V_VERSION   1       /* The VTOC version  */
#define VTOC_SANE   0x600DDEEE  /* Indicates a sane VTOC */
 
#define V_ROOT      0x02        /* Root partiton     */
#define V_USR       0x04        /* Usr partiton      */
 
#define V_RONLY     0x10        /* Read only         */
 
/*
 * The Sun sparc disk label (at offset 0 on a disk)
 */
struct sun_label {
    char        dkl_ascilabel[128];
    struct dk_vtoc {
        Uchar   v_version[4];   /* layout version    */
        char    v_volume[8];    /* volume name       */
        Uchar   v_nparts[2];    /* number of partitions  */
        struct dk_map2 {
            Uchar   p_tag[2]; /* ID tag of partition */
            Uchar   p_flag[2]; /* permission flag    */
 
        }   v_part[NDKMAP];
        Uchar   v_xxpad[2]; /* To come over Sun's alignement problem */
        Uchar   v_bootinfo[3*4]; /* info for mboot   */
        Uchar   v_sanity[4];    /* to verify vtoc sanity */
        Uchar   v_reserved[10*4];
        Uchar   v_timestamp[NDKMAP*4];
 
    }       dkl_vtoc;   /* vtoc inclusions from AT&T SVr4 */
    char        dkl_pad[512-(128+sizeof (struct dk_vtoc)+NDKMAP*8+14*2)];
    Uchar       dkl_rpm[2]; /* rotations per minute */
    Uchar       dkl_pcyl[2];    /* # physical cylinders */
    Uchar       dkl_apc[2]; /* alternates per cylinder */
    Uchar       dkl_obs1[2];    /* obsolete */
    Uchar       dkl_obs2[2];    /* obsolete */
    Uchar       dkl_intrlv[2];  /* interleave factor */
    Uchar       dkl_ncyl[2];    /* # of data cylinders */
    Uchar       dkl_acyl[2];    /* # of alternate cylinders */
    Uchar       dkl_nhead[2];   /* # of heads in this partition */
    Uchar       dkl_nsect[2];   /* # of 512 byte sectors per track */
    Uchar       dkl_obs3[2];    /* obsolete */
    Uchar       dkl_obs4[2];    /* obsolete */
 
    struct dk_map {         /* logical partitions */
        Uchar   dkl_cylno[4];   /* starting cylinder */
        Uchar   dkl_nblk[4];    /* number of blocks */
    }       dkl_map[NDKMAP]; /* logical partition headers */
 
    Uchar       dkl_magic[2];   /* identifies this label format */
    Uchar       dkl_cksum[2];   /* xor checksum of sector */
};
 
/*
 * The Sun x86 / AT&T disk label (at offset 512 on a fdisk partition)
 */
struct x86_label {
    struct x86_vtoc {
        Uchar   v_bootinfo[3*4]; /* unsupported       */
        Uchar   v_sanity[4];    /* to verify vtoc sanity  */
        Uchar   v_version[4];   /* layout version     */
        char    v_volume[8];    /* volume name        */
        Uchar   v_sectorsz[2];  /* # of bytes in a sector */
        Uchar   v_nparts[2];    /* # of partitions */
        Uchar   v_reserved[10*4];
        struct dkl_partition    {
            Uchar   p_tag[2];   /* ID tag of partition */
            Uchar   p_flag[2];  /* permission flag    */
            Uchar   p_start[4]; /* starting sector    */
            Uchar   p_size[4];  /* number of blocks   */
        }   v_part[NX86MAP];
        Uchar   timestamp[NX86MAP][4];
        char    v_asciilabel[128];
    }       dkl_vtoc;   /* vtoc inclusions from AT&T SVr4 */
    Uchar       dkl_pcyl[4];    /* # physical cylinders */
    Uchar       dkl_ncyl[4];    /* # of data cylinders */
    Uchar       dkl_acyl[2];    /* # of alternate cylinders */
    Uchar       dkl_bcyl[2];
    Uchar       dkl_nhead[4];   /* # of heads in this partition */
    Uchar       dkl_nsect[4];   /* # of 512 byte sectors per track */
    Uchar       dkl_intrlv[2];  /* interleave factor */
    Uchar       dkl_skew[2];
    Uchar       dkl_apc[2]; /* alternates per cylinder */
    Uchar       dkl_rpm[2]; /* rotations per minute */
    Uchar       dkl_write_reinstruct[2];
    Uchar       dkl_read_reinstruct[2];
    Uchar       dkl_extra[4*2]; /* for later expansions */
    char        dkl_pad[512-(sizeof (struct x86_vtoc)+4*4+14*2)];
    Uchar       dkl_magic[2];   /* identifies this label format */
    Uchar       dkl_cksum[2];   /* xor checksum of sector */
};
 
/*
 * One x86 PC fdisk partition record.
 */
struct pc_pr {
    Uchar   pr_status;      /* Boot status */
    Uchar   pr_head;        /* Starting head # */
    char    pr_sec_cyl[2];      /* Starting sec+cyl # */
    Uchar   pr_type;        /* Partition type */
    Uchar   pr_e_head;      /* Ending head # */
    char    pr_e_sec_cyl[2];    /* Ending sec+cyl # */
    char    pr_partoff[4];      /* Partition start sector # */
    char    pr_nsect[4];        /* # of sectors in partition */
};
 
/*
 * Flags and macros for above partition record.
 */
#define SEC_MASK    0x3F
#define GET_SEC(a)  ((a) & SEC_MASK)
#define GET_CYL(a)  ((((a) & 0xFF) >> 8) | (((a) & 0xC0) << 2))
 
#define STATUS_INACT    0       /* Marked non bootable  */
#define STATUS_ACTIVE   0x80        /* Marked as bootable   */
 
#define TYPE_FREE       0   /* Unused partition */
#define TYPE_DOS12      0x01    /* FAT12 fileystem  */
#define TYPE_XENIX      0x02    /* XENIX root       */
#define TYPE_XENIX2     0x03    /* XENIX usr        */
#define TYPE_DOS16      0x04    /* FAT16 filesystem */
#define TYPE_XDOS       0x05    /* Extended DOS part    */
#define TYPE_DOS4       0x06    /* FAT16 >= 32 MB   */
#define TYPE_SOLARIS        0x82    /* Solaris x86      */
#define TYPE_SOLARIS_BOOT   0xBE    /* Solaris boot     */
#define TYPE_CDOS4      0xDB    /* CPM          */
 
/*
 * The first sector on a disk from a x86 PC (at offset 0 on a disk)
 */
struct pc_part {
    char        bootcode[0x1BE]; /* Master boot record      */
    struct pc_pr    part[4];    /* The 4 primary partitions */
    Uchar       magic[2];   /* Fixed at 0x55 0xAA       */
};