/*      $NetBSD: disklabel.h,v 1.10 2011/10/01 15:59:00 chs Exp $       */

/*
* 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 _MACHINE_DISKLABEL_H_
#define _MACHINE_DISKLABEL_H_

/*
* On a volume, exclusively used by NetBSD, the boot block starts at
* sector 0. To allow shared use of a volume between two or more OS's,
* the vendor specific AHDI format is supported. In this case the boot
* block is located at the start of an AHDI partition. In any case the
* size of the boot block must be at least 8KB.
*/
#define BBMINSIZE       8192            /* minimum size of boot block      */
#define LABELUSESMBR    0                       /* no MBR partitionning */
#define LABELSECTOR     0               /* `natural' start of boot block   */
#define LABELOFFSET     516             /* offset of disk label in bytes,
                                          relative to start of boot block */
#define LABELMAXSIZE    1020            /* maximum size of disk label, at
                                          least (MAXPARTITIONS * 16 + 152)*/
#define MAXPARTITIONS   16              /* max. # of NetBSD partitions     */
#define SWAP_PART       1               /* xx?b is default swap partition  */
#define RAW_PART        2               /* xx?c is raw partition           */

#define MAXAUXROOTS     29              /* max. # of auxiliary root sectors */

struct cpu_disklabel {
       u_int           cd_bblock;      /* start of NetBSD boot block      */
#define NO_BOOT_BLOCK   ((u_int)-1)
       u_int           cd_label;       /* offset of NetBSD disk label     */
#ifdef DISKLABEL_AHDI
       u_int           cd_bslst;       /* start of AHDI bad sector list   */
       u_int           cd_bslend;      /* end of AHDI bad sector list     */
       u_int           cd_roots[MAXAUXROOTS+1]; /* auxiliary root sectors  */
#endif /* DISKLABEL_AHDI */
};

struct bootblock {
       u_int8_t        bb_xxboot[LABELOFFSET - sizeof(u_int32_t)];
                                               /* first-stage boot loader */
       u_int32_t       bb_magic;               /* boot block magic number */
#define NBDAMAGIC       0x4e424441 /* 'NBDA' */
#define AHDIMAGIC       0x41484449 /* 'AHDI' */
       u_int8_t        bb_label[LABELMAXSIZE]; /* disk pack label         */
       u_int8_t        bb_bootxx[BBMINSIZE - LABELOFFSET - LABELMAXSIZE];
                                               /* second-stage boot loader*/
};

struct disklabel;
#define BBGETLABEL(bb, dl)      memcpy((dl), (bb)->bb_label, sizeof (struct disklabel))
#define BBSETLABEL(bb, dl)      memcpy((bb)->bb_label, (dl), sizeof (struct disklabel))

#endif /* _MACHINE_DISKLABEL_H_ */