summaryrefslogtreecommitdiff
path: root/include/device/disk_status.h
blob: 6db790a5a504703639615ed25a16dd079eefcda5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
/*
 * Mach Operating System
 * Copyright (c) 1991,1990,1989 Carnegie Mellon University
 * All Rights Reserved.
 *
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 *
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 *
 * Carnegie Mellon requests users of this software to return to
 *
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 *
 * any improvements or extensions that they make and grant Carnegie Mellon
 * the rights to redistribute these changes.
 */
/*
 * Copyright (c) 1987, 1988 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 *	@(#)disklabel.h	7.10 (Berkeley) 6/27/88
 */

#ifndef	_DISK_STATUS_H_
#define	_DISK_STATUS_H_

/*
 * Each disk has a label which includes information about the hardware
 * disk geometry, filesystem partitions, and drive specific information.
 * The label is in block 0 or 1, possibly offset from the beginning
 * to leave room for a bootstrap, etc.
 */

#define LABELSECTOR	0			/* sector containing label */
#define LABELOFFSET	64			/* offset of label in sector */
#define DISKMAGIC	((unsigned int) 0x82564557U)	/* The disk magic number */
#ifndef MAXPARTITIONS
#define	MAXPARTITIONS	8
#endif


#ifndef LOCORE
struct disklabel {
	unsigned int	d_magic;		/* the magic number */
	short	d_type;			/* drive type */
	short	d_subtype;		/* controller/d_type specific */
	char	d_typename[16];		/* type name, e.g. "eagle" */
	/*
	 * d_packname contains the pack identifier and is returned when
	 * the disklabel is read off the disk or in-core copy.
	 * d_boot0 and d_boot1 are the (optional) names of the
	 * primary (block 0) and secondary (block 1-15) bootstraps
	 * as found in /usr/mdec.  These are returned when using
	 * getdiskbyname(3) to retrieve the values from /etc/disktab.
	 */
#if defined(MACH_KERNEL) || defined(STANDALONE)
	char	d_packname[16];			/* pack identifier */
#else
	union {
		char	un_d_packname[16];	/* pack identifier */
		struct {
			char *un_d_boot0;	/* primary bootstrap name */
			char *un_d_boot1;	/* secondary bootstrap name */
		} un_b;
	} d_un;
#define d_packname	d_un.un_d_packname
#define d_boot0		d_un.un_b.un_d_boot0
#define d_boot1		d_un.un_b.un_d_boot1
#endif	/* ! MACH_KERNEL or STANDALONE */
			/* disk geometry: */
	unsigned int	d_secsize;		/* # of bytes per sector */
	unsigned int	d_nsectors;		/* # of data sectors per track */
	unsigned int	d_ntracks;		/* # of tracks per cylinder */
	unsigned int	d_ncylinders;		/* # of data cylinders per unit */
	unsigned int	d_secpercyl;		/* # of data sectors per cylinder */
	unsigned int	d_secperunit;		/* # of data sectors per unit */
	/*
	 * Spares (bad sector replacements) below
	 * are not counted in d_nsectors or d_secpercyl.
	 * Spare sectors are assumed to be physical sectors
	 * which occupy space at the end of each track and/or cylinder.
	 */
	unsigned short	d_sparespertrack;	/* # of spare sectors per track */
	unsigned short	d_sparespercyl;		/* # of spare sectors per cylinder */
	/*
	 * Alternate cylinders include maintenance, replacement,
	 * configuration description areas, etc.
	 */
	unsigned int	d_acylinders;		/* # of alt. cylinders per unit */

			/* hardware characteristics: */
	/*
	 * d_interleave, d_trackskew and d_cylskew describe perturbations
	 * in the media format used to compensate for a slow controller.
	 * Interleave is physical sector interleave, set up by the formatter
	 * or controller when formatting.  When interleaving is in use,
	 * logically adjacent sectors are not physically contiguous,
	 * but instead are separated by some number of sectors.
	 * It is specified as the ratio of physical sectors traversed
	 * per logical sector.  Thus an interleave of 1:1 implies contiguous
	 * layout, while 2:1 implies that logical sector 0 is separated
	 * by one sector from logical sector 1.
	 * d_trackskew is the offset of sector 0 on track N
	 * relative to sector 0 on track N-1 on the same cylinder.
	 * Finally, d_cylskew is the offset of sector 0 on cylinder N
	 * relative to sector 0 on cylinder N-1.
	 */
	unsigned short	d_rpm;			/* rotational speed */
	unsigned short	d_interleave;		/* hardware sector interleave */
	unsigned short	d_trackskew;		/* sector 0 skew, per track */
	unsigned short	d_cylskew;		/* sector 0 skew, per cylinder */
	unsigned int	d_headswitch;		/* head switch time, usec */
	unsigned int	d_trkseek;		/* track-to-track seek, usec */
	unsigned int	d_flags;		/* generic flags */
#define NDDATA 5
	unsigned int	d_drivedata[NDDATA];	/* drive-type specific information */
#define NSPARE 5
	unsigned int	d_spare[NSPARE];	/* reserved for future use */
	unsigned int	d_magic2;		/* the magic number (again) */
	unsigned short	d_checksum;		/* xor of data incl. partitions */

			/* filesystem and partition information: */
	unsigned short	d_npartitions;		/* number of partitions in following */
	unsigned int	d_bbsize;		/* size of boot area at sn0, bytes */
	unsigned int	d_sbsize;		/* max size of fs superblock, bytes */
	struct	partition {		/* the partition table */
		unsigned int	p_size;		/* number of sectors in partition */
		unsigned int	p_offset;	/* starting sector */
		unsigned int	p_fsize;	/* filesystem basic fragment size */
		unsigned char	p_fstype;	/* filesystem type, see below */
		unsigned char	p_frag;		/* filesystem fragments per block */
		unsigned short	p_cpg;		/* filesystem cylinders per group */
	} d_partitions[MAXPARTITIONS+1];	/* actually may be more */

#if	defined(alpha) && defined(MACH_KERNEL)
	/*
	 * Disgusting hack. If this structure contains a pointer,
	 * as it does for non-kernel, then the compiler rounds
	 * the size to make it pointer-sized properly (arrays of..).
	 * But if I define the pointer for the kernel then instances
	 * of this structure better be aligned otherwise picking
	 * up a short might be done by too-smart compilers (GCC) with
	 * a load-long instruction expecting the short to be aligned.
	 * I bet the OSF folks stomped into this too, since they use
	 * the same disgusting hack below.. [whatelse can I do ??]
	 */
	int	bugfix;
#endif
};
#else /* LOCORE */
	/*
	 * offsets for asm boot files.
	 */
	.set	d_secsize,40
	.set	d_nsectors,44
	.set	d_ntracks,48
	.set	d_ncylinders,52
	.set	d_secpercyl,56
	.set	d_secperunit,60
	.set	d_end_,276		/* size of disk label */
#endif /* LOCORE */

/* d_type values: */
#define	DTYPE_SMD		1		/* SMD, XSMD; VAX hp/up */
#define	DTYPE_MSCP		2		/* MSCP */
#define	DTYPE_DEC		3		/* other DEC (rk, rl) */
#define	DTYPE_SCSI		4		/* SCSI */
#define	DTYPE_ESDI		5		/* ESDI interface */
#define	DTYPE_ST506		6		/* ST506 etc. */
#define	DTYPE_FLOPPY		10		/* floppy */

#ifdef DKTYPENAMES
static char *dktypenames[] = {
	"unknown",
	"SMD",
	"MSCP",
	"old DEC",
	"SCSI",
	"ESDI",
	"type 6",
	"type 7",
	"type 8",
	"type 9",
	"floppy",
	0
};
#define DKMAXTYPES	(sizeof(dktypenames) / sizeof(dktypenames[0]) - 1)
#endif

/*
 * Filesystem type and version.
 * Used to interpret other filesystem-specific
 * per-partition information.
 */
#define	FS_UNUSED	0		/* unused */
#define	FS_SWAP		1		/* swap */
#define	FS_V6		2		/* Sixth Edition */
#define	FS_V7		3		/* Seventh Edition */
#define	FS_SYSV		4		/* System V */
#define	FS_V71K		5		/* V7 with 1K blocks (4.1, 2.9) */
#define	FS_V8		6		/* Eighth Edition, 4K blocks */
#define	FS_BSDFFS	7		/* 4.2BSD fast file system */
#define FS_LINUXFS	8		/* Linux file system */

#ifdef	DKTYPENAMES
static char *fstypenames[] = {
	"unused",
	"swap",
	"Version 6",
	"Version 7",
	"System V",
	"4.1BSD",
	"Eighth Edition",
	"4.2BSD",
	"Linux",
	0
};
#define FSMAXTYPES	(sizeof(fstypenames) / sizeof(fstypenames[0]) - 1)
#endif

/*
 * flags shared by various drives:
 */
#define		D_REMOVABLE	0x01		/* removable media */
#define		D_ECC		0x02		/* supports ECC */
#define		D_BADSECT	0x04		/* supports bad sector forw. */
#define		D_RAMDISK	0x08		/* disk emulator */
#define		D_CHAIN		0x10		/* can do back-back transfers */

/*
 * Drive data for SMD.
 */
#define	d_smdflags	d_drivedata[0]
#define		D_SSE		0x1		/* supports skip sectoring */
#define	d_mindist	d_drivedata[1]
#define	d_maxdist	d_drivedata[2]
#define	d_sdist		d_drivedata[3]

/*
 * Drive data for ST506.
 */
#define d_precompcyl	d_drivedata[0]
#define d_gap3		d_drivedata[1]		/* used only when formatting */

/*
 * IBM controller info (d_precompcyl used, too)
 */
#define	d_step		d_drivedata[2]

#ifndef LOCORE
/*
 * Structure used to perform a format
 * or other raw operation, returning data
 * and/or register values.
 * Register identification and format
 * are device- and driver-dependent.
 */
struct format_op {
	char	*df_buf;
	int	df_count;		/* value-result */
	recnum_t	df_startblk;
	int	df_reg[8];		/* result */
};

/*
 * Disk-specific ioctls.
 */
		/* get and set disklabel; DIOCGPART used internally */
#define DIOCGDINFO	_IOR('d', 101, struct disklabel)/* get */
#define DIOCSDINFO	_IOW('d', 102, struct disklabel)/* set */
#define DIOCWDINFO	_IOW('d', 103, struct disklabel)/* set, update disk */

/* do format operation, read or write */
#define DIOCRFORMAT	_IOWR('d', 105, struct format_op)
#define DIOCWFORMAT	_IOWR('d', 106, struct format_op)

#define DIOCSSTEP	_IOW('d', 107, int)	/* set step rate */
#define DIOCSRETRIES	_IOW('d', 108, int)	/* set # of retries */
#define DIOCWLABEL	_IOW('d', 109, int)	/* write en/disable label */

#define DIOCSBAD	_IOW('d', 110, struct dkbad)	/* set kernel dkbad */

#endif /* LOCORE */

#endif	/* _DISK_STATUS_H_ */