1/*	$NetBSD: disklabel.h,v 1.9 2011/08/30 12:39:53 bouyer Exp $	*/
2
3/*
4 * Copyright (c) 1995 Leo Weppelman.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#ifndef _MACHINE_DISKLABEL_H_
29#define _MACHINE_DISKLABEL_H_
30
31/*
32 * On a volume, exclusively used by NetBSD, the boot block starts at
33 * sector 0. To allow shared use of a volume between two or more OS's,
34 * the vendor specific AHDI format is supported. In this case the boot
35 * block is located at the start of an AHDI partition. In any case the
36 * size of the boot block must be at least 8KB.
37 */
38#define	BBMINSIZE	8192		/* minimum size of boot block      */
39#define LABELUSESMBR	0			/* no MBR partitionning */
40#define LABELSECTOR	0		/* `natural' start of boot block   */
41#define LABELOFFSET	516		/* offset of disk label in bytes,
42					   relative to start of boot block */
43#define LABELMAXSIZE	1020		/* maximum size of disk label, at
44					   least (MAXPARTITIONS * 16 + 152)*/
45#define MAXPARTITIONS	16		/* max. # of NetBSD partitions     */
46#define SWAP_PART	1		/* xx?b is default swap partition  */
47#define RAW_PART	2		/* xx?c is raw partition	   */
48
49#define MAXAUXROOTS	29		/* max. # of auxiliary root sectors */
50
51struct cpu_disklabel {
52	u_int		cd_bblock;	/* start of NetBSD boot block      */
53#define NO_BOOT_BLOCK	((u_int)-1)
54	u_int		cd_label;	/* offset of NetBSD disk label     */
55#ifdef DISKLABEL_AHDI
56	u_int		cd_bslst;	/* start of AHDI bad sector list   */
57	u_int		cd_bslend;	/* end of AHDI bad sector list     */
58	u_int		cd_roots[MAXAUXROOTS+1]; /* auxiliary root sectors  */
59#endif /* DISKLABEL_AHDI */
60};
61
62struct bootblock {
63	u_int8_t	bb_xxboot[LABELOFFSET - sizeof(u_int32_t)];
64						/* first-stage boot loader */
65	u_int32_t	bb_magic;		/* boot block magic number */
66#define	NBDAMAGIC	0x4e424441 /* 'NBDA' */
67#define	AHDIMAGIC	0x41484449 /* 'AHDI' */
68	u_int8_t	bb_label[LABELMAXSIZE];	/* disk pack label         */
69	u_int8_t	bb_bootxx[BBMINSIZE - LABELOFFSET - LABELMAXSIZE];
70						/* second-stage boot loader*/
71};
72
73struct disklabel;
74#define	BBGETLABEL(bb, dl)	memcpy((dl), (bb)->bb_label, sizeof (struct disklabel))
75#define	BBSETLABEL(bb, dl)	memcpy((bb)->bb_label, (dl), sizeof (struct disklabel))
76
77#endif /* _MACHINE_DISKLABEL_H_ */
78