disklabel.h revision 1.14 
1/*	$OpenBSD: disklabel.h,v 1.14 2006/06/19 01:52:19 krw Exp $	*/
2/*	$NetBSD: disklabel.h,v 1.1 1995/02/13 23:07:34 cgd 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
37enum disklabel_tag { DLT_ALPHA, DLT_I386 };
38
39/*
40 * What disklabels are we probing for, and in which order?
41 */
42#ifndef LABELPROBES
43#define LABELPROBES		DLT_ALPHA, DLT_I386
44#endif
45
46#define	ALPHA_LABELSECTOR	0		/* sector containing label */
47#define	ALPHA_LABELOFFSET	64		/* offset of label in sector */
48#define	I386_LABELSECTOR	1		/* sector containing label */
49#define	I386_LABELOFFSET	0		/* offset of label in sector */
50
51#define LABELSECTOR		ALPHA_LABELSECTOR
52#define LABELOFFSET		ALPHA_LABELOFFSET
53
54#define	MAXPARTITIONS		16		/* number of partitions */
55#define	RAW_PART		2		/* raw partition: xx?c */
56
57/* DOS partition table -- located in boot block */
58#define	DOSBBSECTOR	0		/* DOS boot block relative sector # */
59#define	DOSPARTOFF	446
60#define DOSACTIVE	0x80
61#define	NDOSPART	4
62#define DOSMBR_SIGNATURE 0xaa55
63#define DOSMBR_SIGNATURE_OFF 0x1fe
64
65struct dos_partition {
66	u_int8_t	dp_flag;	/* bootstrap flags */
67	u_int8_t	dp_shd;		/* starting head */
68	u_int8_t	dp_ssect;	/* starting sector */
69	u_int8_t	dp_scyl;	/* starting cylinder */
70	u_int8_t	dp_typ;		/* partition type (see below) */
71	u_int8_t	dp_ehd;		/* end head */
72	u_int8_t	dp_esect;	/* end sector */
73	u_int8_t	dp_ecyl;	/* end cylinder */
74	u_int32_t	dp_start;	/* absolute starting sector number */
75	u_int32_t	dp_size;	/* partition size in sectors */
76};
77
78/* Known DOS partition types. */
79#define	DOSPTYP_UNUSED	0x00		/* Unused partition */
80#define DOSPTYP_FAT12	0x01		/* 12-bit FAT */
81#define DOSPTYP_FAT16S	0x04		/* 16-bit FAT, less than 32M */
82#define DOSPTYP_EXTEND	0x05		/* Extended; contains sub-partitions */
83#define DOSPTYP_FAT16B	0x06		/* 16-bit FAT, more than 32M */
84#define DOSPTYP_FAT32	0x0b		/* 32-bit FAT */
85#define DOSPTYP_FAT32L	0x0c		/* 32-bit FAT, LBA-mapped */
86#define DOSPTYP_FAT16L	0x0e		/* 16-bit FAT, LBA-mapped */
87#define DOSPTYP_EXTENDL 0x0f		/* Extended, LBA-mapped; contains sub-partitions */
88#define DOSPTYP_ONTRACK	0x54
89#define	DOSPTYP_LINUX	0x83		/* That other thing */
90#define DOSPTYP_FREEBSD	0xa5		/* FreeBSD partition type */
91#define DOSPTYP_OPENBSD	0xa6		/* OpenBSD partition type */
92#define DOSPTYP_NETBSD	0xa9		/* NetBSD partition type */
93
94/* Isolate the relevant bits to get sector and cylinder. */
95#define	DPSECT(s)	((s) & 0x3f)
96#define	DPCYL(c, s)	((c) + (((s) & 0xc0) << 2))
97
98#include <sys/dkbad.h>
99struct cpu_disklabel {
100	enum disklabel_tag labeltag;
101	int labelsector;
102	union {
103		struct {
104		} _alpha;
105		struct {
106			struct dos_partition dosparts[NDOSPART];
107			struct dkbad bad;
108		} _i386;
109	} u;
110};
111
112#define DKBAD(x) ((x)->u._i386.bad)
113
114#endif /* _MACHINE_DISKLABEL_H_ */
115