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Annotation of researchv9/sys/sun/dklabel.h, revision 1.1

1.1     ! root        1: /*     @(#)dklabel.h 1.1 86/02/03 SMI  */
        !             2: 
        !             3: /*
        !             4:  * Copyright (c) 1983 by Sun Microsystems, Inc.
        !             5:  */
        !             6: 
        !             7: /*
        !             8:  * Format of a Sun SMD disk label.
        !             9:  * Resides in cylinder 0, sector 0 on each head which is the first
        !            10:  * head of a physical partition (e.g., heads 0 and 2 for a CDC Lark).
        !            11:  * dkl_ppart gives the physical partition number (currently only 0 or 1).
        !            12:  * dkl_bhead must match the head on which the label is found;
        !            13:  * otherwise the label was probably overwritten by another.
        !            14:  *
        !            15:  * sizeof(struct dk_label) should be 512 (sector size)
        !            16:  */
        !            17: 
        !            18: #define        NDKMAP  8       /* # of logical partitions */
        !            19: struct dk_label {
        !            20:        char    dkl_asciilabel[128];    /* for compatibility */
        !            21:        char    dkl_pad[512-(128+8*8+11*2)];
        !            22:        unsigned short  dkl_gap1;       /* size of gap 1 */
        !            23:        unsigned short  dkl_gap2;       /* size of gap 2 */
        !            24:        unsigned short  dkl_intrlv;     /* interleave factor */
        !            25:        unsigned short  dkl_ncyl;       /* # of data cylinders */
        !            26:        unsigned short  dkl_acyl;       /* # of alternate cylinders */
        !            27:        unsigned short  dkl_nhead;      /* # of heads in this partition */
        !            28:        unsigned short  dkl_nsect;      /* # of 512 byte sectors per track */
        !            29:        unsigned short  dkl_bhead;      /* identifies proper label location */
        !            30:        unsigned short  dkl_ppart;      /* physical partition # */
        !            31:        /* */
        !            32:        struct dk_map {                 /* logical partitions */
        !            33:                daddr_t dkl_cylno;      /* starting cylinder */
        !            34:                daddr_t dkl_nblk;       /* number of blocks */
        !            35:        } dkl_map[NDKMAP];
        !            36:        unsigned short  dkl_magic;      /* identifies this label format */
        !            37:        unsigned short  dkl_cksum;      /* xor checksum of sector */
        !            38: };
        !            39: 
        !            40: #define        DKL_MAGIC       0xDABE

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