xref: /illumos-gate/usr/src/uts/common/sys/dktp/fdisk.h (revision aa1b14e7d68925d80eebf0ce8ed0b9cc55246546)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 
22 /*
23  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 /*	Copyright (c) 1984, 1986, 1987, 1988 AT&T	*/
27 /*	  All Rights Reserved  	*/
28 
29 
30 #ifndef _SYS_DKTP_FDISK_H
31 #define	_SYS_DKTP_FDISK_H
32 
33 #ifdef	__cplusplus
34 extern "C" {
35 #endif
36 
37 /*
38  * fdisk.h
39  * This file defines the structure of physical disk sector 0 for use on
40  * AT386 systems.  The format of this sector is constrained by the ROM
41  * BIOS and MS-DOS conventions.
42  * Note that this block does not define the partitions used by the unix
43  * driver.  The unix partitions are obtained from the VTOC.
44  */
45 
46 /*
47  * the MAX values are the maximum usable values for BIOS chs values
48  * The MAX_CYL value of 1022 is the maximum usable value
49  *   the value of 1023 is a fence value,
50  *   indicating no CHS geometry exists for the corresponding LBA value.
51  * HEAD range [ 0 .. MAX_HEAD ], so number of heads is (MAX_HEAD + 1)
52  * SECT range [ 1 .. MAX_SECT ], so number of sectors is (MAX_SECT)
53  */
54 #define	MAX_SECT	(63)
55 #define	MAX_CYL		(1022)
56 #define	MAX_HEAD	(254)
57 
58 /*
59  * BOOTSZ was reduced from 446 to 440 bytes to NOT overwrite the Windows
60  * Vista DISKID. Otherwise Vista won't boot from Solaris GRUB in a dual-boot
61  * setup.
62  * The actual size of mboot code is 425 bytes while that of GRUB stage1 is
63  * 423 bytes. So this changes does not harm them.
64  */
65 #define	BOOTSZ		440	/* size of boot code in master boot block */
66 #define	FD_NUMPART	4	/* number of 'partitions' in fdisk table */
67 #define	MBB_MAGIC	0xAA55	/* magic number for mboot.signature */
68 #define	DEFAULT_INTLV	4	/* default interleave for testing tracks */
69 #define	MINPSIZE	4	/* minimum number of cylinders in a partition */
70 #define	TSTPAT		0xE5	/* test pattern for verifying disk */
71 
72 /*
73  * structure to hold the fdisk partition table
74  */
75 struct ipart {
76 	unsigned char bootid;	/* bootable or not */
77 	unsigned char beghead;	/* beginning head, sector, cylinder */
78 	unsigned char begsect;	/* begcyl is a 10-bit number. High 2 bits */
79 	unsigned char begcyl;	/*	are in begsect. */
80 	unsigned char systid;	/* OS type */
81 	unsigned char endhead;	/* ending head, sector, cylinder */
82 	unsigned char endsect;	/* endcyl is a 10-bit number.  High 2 bits */
83 	unsigned char endcyl;	/*	are in endsect. */
84 	uint32_t relsect;	/* first sector relative to start of disk */
85 	uint32_t numsect;	/* number of sectors in partition */
86 };
87 /*
88  * Values for bootid.
89  */
90 #define	NOTACTIVE	0
91 #define	ACTIVE		128
92 /*
93  * Values for systid.
94  */
95 #define	UNUSED		0	/* Empty Partition */
96 #define	DOSOS12		1	/* DOS partition, 12-bit FAT */
97 #define	PCIXOS		2	/* PC/IX partition */
98 #define	DOSOS16		4	/* DOS partition, 16-bit FAT */
99 #define	EXTDOS		5	/* EXT-DOS partition */
100 #define	DOSHUGE		6	/* Huge DOS partition  > 32MB */
101 #define	FDISK_IFS	7	/* Installable File System (IFS): HPFS & NTFS */
102 #define	FDISK_AIXBOOT	8	/* AIX Boot */
103 #define	FDISK_AIXDATA	9	/* AIX Data */
104 #define	FDISK_OS2BOOT	10	/* OS/2 Boot Manager */
105 #define	FDISK_WINDOWS	11	/* Windows 95 FAT32 (up to 2047GB) */
106 #define	FDISK_EXT_WIN	12	/* Windows 95 FAT32 (extended-INT13) */
107 #define	FDISK_FAT95	14	/* DOS 16-bit FAT, LBA-mapped */
108 #define	FDISK_EXTLBA	15	/* Extended partition, LBA-mapped */
109 #define	DIAGPART	18	/* Diagnostic boot partition (OS independent) */
110 #define	FDISK_LINUX	65	/* Linux */
111 #define	FDISK_LINUXDSWAP	66	/* Linux swap (sharing disk w/ DRDOS) */
112 #define	FDISK_LINUXDNAT	67	/* Linux native (sharing disk with DRDOS) */
113 #define	FDISK_CPM	82	/* CP/M */
114 #define	DOSDATA		86	/* DOS data partition */
115 #define	OTHEROS		98	/* part. type for appl. (DB?) needs */
116 				/* raw partition.  ID was 0 but conflicted */
117 				/* with DOS 3.3 fdisk    */
118 #define	UNIXOS		99	/* UNIX V.x partition */
119 #define	FDISK_NOVELL2	100	/* Novell Netware 286 */
120 #define	FDISK_NOVELL3	101	/* Novell Netware 3.x and later */
121 #define	FDISK_QNX4	119	/* QNX 4.x */
122 #define	FDISK_QNX42	120	/* QNX 4.x 2nd part */
123 #define	FDISK_QNX43	121	/* QNX 4.x 3rd part */
124 #define	SUNIXOS		130	/* Solaris UNIX partition */
125 #define	FDISK_LINUXNAT	131	/* Linux native */
126 #define	FDISK_NTFSVOL1	134	/* NTFS volume set 1 */
127 #define	FDISK_NTFSVOL2	135	/* NTFS volume set 2 */
128 #define	FDISK_BSD	165	/* BSD/386, 386BSD, NetBSD, FreeBSD, OpenBSD */
129 #define	FDISK_NEXTSTEP	167	/* NeXTSTEP */
130 #define	FDISK_BSDIFS	183	/* BSDI file system */
131 #define	FDISK_BSDISWAP	184	/* BSDI swap */
132 #define	X86BOOT		190	/* x86 Solaris boot partition */
133 #define	SUNIXOS2	191	/* Solaris UNIX partition */
134 #define	EFI_PMBR	238	/* EFI PMBR */
135 #define	EFI_FS		239	/* EFI File System (System Partition) */
136 #define	MAXDOS		65535L	/* max size (sectors) for DOS partition */
137 
138 /*
139  * structure to hold master boot block in physical sector 0 of the disk.
140  * Note that partitions stuff can't be directly included in the structure
141  * because of lameo '386 compiler alignment design.
142  * Alignment issues also force us to have 2 16bit entities for a single
143  * 32bit win_volserno. It is not used anywhere anyway.
144  */
145 
146 struct mboot {	/* master boot block */
147 	char	bootinst[BOOTSZ];
148 	uint16_t win_volserno_lo;
149 	uint16_t win_volserno_hi;
150 	uint16_t reserved;
151 	char	parts[FD_NUMPART * sizeof (struct ipart)];
152 	ushort_t signature;
153 };
154 
155 #if defined(__i386) || defined(__amd64)
156 
157 /* Byte offset of the start of the partition table within the sector */
158 #define	FDISK_PART_TABLE_START	446
159 
160 /* Maximum number of valid partitions assumed as 32 */
161 #define	MAX_EXT_PARTS	32
162 
163 #else
164 
165 #define	MAX_EXT_PARTS	0
166 
167 #endif	/* if defined(__i386) || defined(__amd64) */
168 
169 #ifdef	__cplusplus
170 }
171 #endif
172 
173 #endif	/* _SYS_DKTP_FDISK_H */
174