/* adapted from NeXT headers:
 * usr/include/sys/disktab.h
 * usr/include/nextdev/disk.h
 * simplified since we don't ware about disktab, and version < 3.
 * see also:
 * https://doxygen.reactos.org/d7/d53/bootblock_8h.html
 */

#include <sys/types.h>

/* actually not packed, but aligned at 2 bytes */
#pragma pack(push,2)

struct disk_label {
#define DL_V1           0x4e655854      /* version #1: "NeXT" */
#define DL_V2           0x646c5632      /* version #2: "dlV2" */
#define DL_V3           0x646c5633      /* version #3: "dlV3" */
#define DL_VERSION      DL_V3           /* default version */
        int     dl_version;             /* label version number */
        int     dl_label_blkno;         /* block # where this label is */
        int     dl_size;                /* size of media area (sectors) */
#define MAXLBLLEN       24
        char    dl_label[MAXLBLLEN];    /* media label */
        u_int32_t       dl_flags;               /* flags */
#define DL_UNINIT       0x80000000      /* label is uninitialized */
        u_int32_t       dl_tag;                 /* volume tag */
        /* the rest really is a struct  disktab dl_dt;*/                /* common info in disktab */
#define MAXDNMLEN       24
        char    dl_name[MAXDNMLEN];     /* drive name */
#define MAXTYPLEN       24
        char    dl_type[MAXTYPLEN];     /* drive type */
        int     dl_secsize;             /* sector size in bytes */
        int     dl_ntrack;              /* # tracks/cylinder */
        int     dl_nsect;               /* # sectors/track */
        int     dl_ncyl;                /* # cylinders */
        int     dl_rpm;                 /* revolutions/minute */
        short   dl_front;               /* size of front porch (sectors) */
        short   dl_back;                        /* size of back porch (sectors) */
        short   dl_ngroups;             /* number of alt groups */
        short   dl_ag_size;             /* alt group size (sectors) */
        short   dl_ag_alts;             /* alternate sectors / alt group */
        short   dl_ag_off;              /* sector offset to first alternate */
#define NBOOTS  2
        int     dl_boot0_blkno[NBOOTS]; /* "blk 0" boot locations */
#define MAXBFLEN 24
        char    dl_bootfile[MAXBFLEN];  /* default bootfile */
#define MAXHNLEN 32
        char    dl_hostname[MAXHNLEN];  /* host name */
        char    dl_rootpartition;       /* root partition e.g. 'a' */
        char    dl_rwpartition;         /* r/w partition e.g. 'b' */
#define NPART   8
        struct  partition {
                int     p_base;         /* base sector# of partition */
                int     p_size;         /* #sectors in partition */
                short   p_bsize;        /* block size in bytes */
                short   p_fsize;        /* frag size in bytes */
                char    p_opt;          /* 's'pace/'t'ime optimization pref */
                short   p_cpg;          /* cylinders per group */
                short   p_density;      /* bytes per inode density */
                char    p_minfree;      /* minfree (%) */
                char    p_newfs;        /* run newfs during init */
#define MAXMPTLEN       16
                char    p_mountpt[MAXMPTLEN];/* mount point */
                char    p_automnt;      /* auto-mount when inserted */
#define MAXFSTLEN       8
                char    p_type[MAXFSTLEN];/* file system type */
        } dl_part[NPART];

        /*
         *  if dl_version >= DL_V3 then the bad block table is relocated
         *  to a structure separate from the disk label.
         */
        union {
                u_int16_t       DL_v3_checksum;
#define NBAD    1670                    /* sized to make label ~= 8KB */
                int     DL_bad[NBAD];   /* block number that is bad */
        } dl_un;
#define dl_v3_checksum  dl_un.DL_v3_checksum
#define dl_bad          dl_un.DL_bad
        u_int16_t       dl_checksum;            /* ones complement checksum */

        /* add things here so dl_checksum stays in a fixed place */
};

#pragma pack(pop)