disklabel.h revision 1.7 
1/*	$OpenBSD: disklabel.h,v 1.7 2006/10/18 20:09:38 deraadt Exp $	*/
2/*	$NetBSD: disklabel.h,v 1.3 1996/03/09 20:52:54 ghudson Exp $	*/
3
4/*
5 * Copyright (c) 1994 Christopher G. Demetriou
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *      This product includes software developed by Christopher G. Demetriou.
19 * 4. The name of the author may not be used to endorse or promote products
20 *    derived from this software without specific prior written permission
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34#ifndef _MACHINE_DISKLABEL_H_
35#define _MACHINE_DISKLABEL_H_
36
37#define	LABELSECTOR	1		/* sector containing label */
38#define	LABELOFFSET	0		/* offset of label in sector */
39#define	MAXPARTITIONS	16		/* number of partitions */
40#define	RAW_PART	2		/* raw partition: ie. rsd0c */
41
42/* DOS partition table -- located in boot block */
43#define	DOSBBSECTOR	0		/* DOS boot block relative sector # */
44#define	DOSPARTOFF	446
45#define	DOSDISKOFF	444
46#define	NDOSPART	4
47#define	DOSACTIVE	0x80		/* active partition */
48
49struct dos_partition {
50	u_int8_t	dp_flag;	/* bootstrap flags */
51	u_int8_t	dp_shd;		/* starting head */
52	u_int8_t	dp_ssect;	/* starting sector */
53	u_int8_t	dp_scyl;	/* starting cylinder */
54	u_int8_t	dp_typ;		/* partition type (see below) */
55	u_int8_t	dp_ehd;		/* end head */
56	u_int8_t	dp_esect;	/* end sector */
57	u_int8_t	dp_ecyl;	/* end cylinder */
58	u_int32_t	dp_start;	/* absolute starting sector number */
59	u_int32_t	dp_size;	/* partition size in sectors */
60};
61
62/* Known DOS partition types. */
63#define	DOSPTYP_UNUSED	0x00		/* Unused partition */
64#define DOSPTYP_FAT12	0x01		/* 12-bit FAT */
65#define DOSPTYP_FAT16S	0x04		/* 16-bit FAT, less than 32M */
66#define DOSPTYP_EXTEND	0x05		/* Extended; contains sub-partitions */
67#define DOSPTYP_FAT16B	0x06		/* 16-bit FAT, more than 32M */
68#define DOSPTYP_FAT32	0x0b		/* 32-bit FAT */
69#define DOSPTYP_FAT32L	0x0c		/* 32-bit FAT, LBA-mapped */
70#define DOSPTYP_FAT16L	0x0e		/* 16-bit FAT, LBA-mapped */
71#define DOSPTYP_EXTENDL 0x0f		/* Extended, LBA-mapped; contains sub-partitions */
72#define DOSPTYP_ONTRACK	0x54
73#define	DOSPTYP_LINUX	0x83		/* That other thing */
74#define DOSPTYP_FREEBSD	0xa5		/* FreeBSD partition type */
75#define DOSPTYP_OPENBSD	0xa6		/* OpenBSD partition type */
76#define DOSPTYP_NETBSD	0xa9		/* NetBSD partition type */
77
78struct dos_mbr {
79	u_int8_t		dmbr_boot[DOSPARTOFF];
80	struct dos_partition	dmbr_parts[NDOSPART];
81	u_int16_t		dmbr_sign;
82} __packed;
83
84#define DOSMBR_SIGNATURE	(0xaa55)
85#define DOSMBR_SIGNATURE_OFF	(0x1fe)
86
87struct cpu_disklabel {
88	struct dos_partition dosparts[NDOSPART];
89};
90
91/* Isolate the relevant bits to get sector and cylinder. */
92#define	DPSECT(s)	((s) & 0x3f)
93#define	DPCYL(c, s)	((c) + (((s) & 0xc0) << 2))
94
95#endif /* _MACHINE_DISKLABEL_H_ */
96