/*
 * Copyright (c) 1995 Leo Weppelman.
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */

#ifndef AHDI_H
#define AHDI_H

#define AHDI_BSIZE      512             /* AHDI blocksize               */
#define AHDI_BBLOCK     0               /* AHDI bootblock (root sector) */

/*
 * Various `well known' AHDI partition identifiers.
 */
#define AHDI_MKPID(x,y,z)       (   ((u_int32_t)(x) << 16)      \
                                  | ((u_int32_t)(y) << 8)       \
                                  | ((u_int32_t)(z))            \
                                )
#define AHDI_PID_XGM    AHDI_MKPID('X','G','M')
#define AHDI_PID_GEM    AHDI_MKPID('G','E','M')
#define AHDI_PID_BGM    AHDI_MKPID('B','G','M')
#define AHDI_PID_RAW    AHDI_MKPID('R','A','W')
#define AHDI_PID_SWP    AHDI_MKPID('S','W','P')
#define AHDI_PID_NBD    AHDI_MKPID('N','B','D')
#define AHDI_PID_NBR    AHDI_MKPID('N','B','R')
#define AHDI_PID_NBS    AHDI_MKPID('N','B','S')
#define AHDI_PID_NBU    AHDI_MKPID('N','B','U')

/*
 * Format of AHDI boot block.
 */
#define AHDI_MAXRPD     4               /* max. # of partition descriptors */
                                        /* in an AHDI bootblock (aka root) */
#define AHDI_MAXARPD    2               /* max. # of partition descriptors */

/*
 * On-disk representation of the AHDI disklabel.
 */
struct ahdi_part {
        u_int8_t        ap_flg;         /* bit 0 is in-use flag            */
        u_int8_t        ap_id[3];       /* id: GEM, BGM, XGM, UNX, MIX     */
        u_int32_t       ap_st;          /* block where partition starts    */
        u_int32_t       ap_size;        /* partition size in blocks        */
};

struct ahdi_root {
        u_int8_t         ar_fill[0x1c2];/* filler, can be boot code        */
        u_int32_t        ar_hdsize;     /* size of entire volume in blocks */
        struct ahdi_part ar_parts[AHDI_MAXRPD]; /* root partition table    */
        u_int32_t        ar_bslst;      /* start of bad-sector list        */
        u_int32_t        ar_bslsize;    /* # of blocks in bad-sector list  */
        u_int16_t        ar_checksum;
};

/*
 * Partition table representation as generated by ahdi_getparts():
 */
typedef struct {
        char    id[4];
        u_int   start;
        u_int   end;
        u_int   rsec;
        u_int   rent;
        int     mod;
} part_t;

typedef struct {
        int     nparts;
        part_t  *parts;
} ptable_t;

/*
 * Functions exported from ahdi.c
 */
EXTERN u_int ahdi_getparts PROTO((disk_t *, ptable_t *, u_int, u_int));
#endif /*  AHDI_H */