1 /*
2 * Mach Operating System
3 * Copyright (c) 1991,1990,1989 Carnegie Mellon University
4 * All Rights Reserved.
5 *
6 * Permission to use, copy, modify and distribute this software and its
7 * documentation is hereby granted, provided that both the copyright
8 * notice and this permission notice appear in all copies of the
9 * software, derivative works or modified versions, and any portions
10 * thereof, and that both notices appear in supporting documentation.
11 *
12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
15 *
16 * Carnegie Mellon requests users of this software to return to
17 *
18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
19 * School of Computer Science
20 * Carnegie Mellon University
21 * Pittsburgh PA 15213-3890
22 *
23 * any improvements or extensions that they make and grant Carnegie Mellon
24 * the rights to redistribute these changes.
25 */
26 /*
27 * HISTORY
28 * $Log: disk_status.h,v $
29 * Revision 2.7 93/03/09 10:54:16 danner
30 * Horrible alpha-specific fix. See apologies in the code.
31 * [93/02/26 af]
32 *
33 * Revision 2.5.1.1 92/12/10 17:33:17 af
34 * Changed longs into ints, which is what they are anyways.
35 * When we'll have a disk 1 terabyte big we'll see about it.
36 * [92/08/02 af]
37 *
38 * Revision 2.5 92/05/21 17:09:16 jfriedl
39 * Appended 'U' to long constant.
40 * [92/05/21 15:40:18 jfriedl]
41 *
42 * Revision 2.4 92/04/03 12:08:31 rpd
43 * We add one more partition so that we can point to the "whole"
44 * disk. It is at slot MAXPARTITIONS.
45 * [92/04/01 rvb]
46 *
47 * Revision 2.3 91/05/14 15:43:50 mrt
48 * Correcting copyright
49 *
50 * Revision 2.2 91/05/13 06:02:21 af
51 * Created, starting from Reno's disklabel.h (copyright included).
52 * [91/05/03 af]
53 *
54 */
55 /*
56 * Copyright (c) 1987, 1988 Regents of the University of California.
57 * All rights reserved.
58 *
59 * Redistribution and use in source and binary forms are permitted
60 * provided that the above copyright notice and this paragraph are
61 * duplicated in all such forms and that any documentation,
62 * advertising materials, and other materials related to such
63 * distribution and use acknowledge that the software was developed
64 * by the University of California, Berkeley. The name of the
65 * University may not be used to endorse or promote products derived
66 * from this software without specific prior written permission.
67 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
68 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
69 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
70 *
71 * @(#)disklabel.h 7.10 (Berkeley) 6/27/88
72 */
73
74 #ifndef _DISK_STATUS_H_
75 #define _DISK_STATUS_H_
76
77 /*
78 * Each disk has a label which includes information about the hardware
79 * disk geometry, filesystem partitions, and drive specific information.
80 * The label is in block 0 or 1, possibly offset from the beginning
81 * to leave room for a bootstrap, etc.
82 */
83
84 #define LABELSECTOR 0 /* sector containing label */
85 #define LABELOFFSET 64 /* offset of label in sector */
86 #define DISKMAGIC ((unsigned int) 0x82564557U) /* The disk magic number */
87 #ifndef MAXPARTITIONS
88 #define MAXPARTITIONS 8
89 #endif
90
91
92 #ifndef LOCORE
93 struct disklabel {
94 unsigned int d_magic; /* the magic number */
95 short d_type; /* drive type */
96 short d_subtype; /* controller/d_type specific */
97 char d_typename[16]; /* type name, e.g. "eagle" */
98 /*
99 * d_packname contains the pack identifier and is returned when
100 * the disklabel is read off the disk or in-core copy.
101 * d_boot0 and d_boot1 are the (optional) names of the
102 * primary (block 0) and secondary (block 1-15) bootstraps
103 * as found in /usr/mdec. These are returned when using
104 * getdiskbyname(3) to retrieve the values from /etc/disktab.
105 */
106 #if defined(KERNEL) || defined(STANDALONE)
107 char d_packname[16]; /* pack identifier */
108 #else
109 union {
110 char un_d_packname[16]; /* pack identifier */
111 struct {
112 char *un_d_boot0; /* primary bootstrap name */
113 char *un_d_boot1; /* secondary bootstrap name */
114 } un_b;
115 } d_un;
116 #define d_packname d_un.un_d_packname
117 #define d_boot0 d_un.un_b.un_d_boot0
118 #define d_boot1 d_un.un_b.un_d_boot1
119 #endif /* ! KERNEL or STANDALONE */
120 /* disk geometry: */
121 unsigned int d_secsize; /* # of bytes per sector */
122 unsigned int d_nsectors; /* # of data sectors per track */
123 unsigned int d_ntracks; /* # of tracks per cylinder */
124 unsigned int d_ncylinders; /* # of data cylinders per unit */
125 unsigned int d_secpercyl; /* # of data sectors per cylinder */
126 unsigned int d_secperunit; /* # of data sectors per unit */
127 /*
128 * Spares (bad sector replacements) below
129 * are not counted in d_nsectors or d_secpercyl.
130 * Spare sectors are assumed to be physical sectors
131 * which occupy space at the end of each track and/or cylinder.
132 */
133 unsigned short d_sparespertrack; /* # of spare sectors per track */
134 unsigned short d_sparespercyl; /* # of spare sectors per cylinder */
135 /*
136 * Alternate cylinders include maintenance, replacement,
137 * configuration description areas, etc.
138 */
139 unsigned int d_acylinders; /* # of alt. cylinders per unit */
140
141 /* hardware characteristics: */
142 /*
143 * d_interleave, d_trackskew and d_cylskew describe perturbations
144 * in the media format used to compensate for a slow controller.
145 * Interleave is physical sector interleave, set up by the formatter
146 * or controller when formatting. When interleaving is in use,
147 * logically adjacent sectors are not physically contiguous,
148 * but instead are separated by some number of sectors.
149 * It is specified as the ratio of physical sectors traversed
150 * per logical sector. Thus an interleave of 1:1 implies contiguous
151 * layout, while 2:1 implies that logical sector 0 is separated
152 * by one sector from logical sector 1.
153 * d_trackskew is the offset of sector 0 on track N
154 * relative to sector 0 on track N-1 on the same cylinder.
155 * Finally, d_cylskew is the offset of sector 0 on cylinder N
156 * relative to sector 0 on cylinder N-1.
157 */
158 unsigned short d_rpm; /* rotational speed */
159 unsigned short d_interleave; /* hardware sector interleave */
160 unsigned short d_trackskew; /* sector 0 skew, per track */
161 unsigned short d_cylskew; /* sector 0 skew, per cylinder */
162 unsigned int d_headswitch; /* head switch time, usec */
163 unsigned int d_trkseek; /* track-to-track seek, usec */
164 unsigned int d_flags; /* generic flags */
165 #define NDDATA 5
166 unsigned int d_drivedata[NDDATA]; /* drive-type specific information */
167 #define NSPARE 5
168 unsigned int d_spare[NSPARE]; /* reserved for future use */
169 unsigned int d_magic2; /* the magic number (again) */
170 unsigned short d_checksum; /* xor of data incl. partitions */
171
172 /* filesystem and partition information: */
173 unsigned short d_npartitions; /* number of partitions in following */
174 unsigned int d_bbsize; /* size of boot area at sn0, bytes */
175 unsigned int d_sbsize; /* max size of fs superblock, bytes */
176 struct partition { /* the partition table */
177 unsigned int p_size; /* number of sectors in partition */
178 unsigned int p_offset; /* starting sector */
179 unsigned int p_fsize; /* filesystem basic fragment size */
180 unsigned char p_fstype; /* filesystem type, see below */
181 unsigned char p_frag; /* filesystem fragments per block */
182 unsigned short p_cpg; /* filesystem cylinders per group */
183 } d_partitions[MAXPARTITIONS+1]; /* actually may be more */
184
185 #if defined(alpha) && defined(KERNEL)
186 /*
187 * Disgusting hack. If this structure contains a pointer,
188 * as it does for non-kernel, then the compiler rounds
189 * the size to make it pointer-sized properly (arrays of..).
190 * But if I define the pointer for the kernel then instances
191 * of this structure better be aligned otherwise picking
192 * up a short might be done by too-smart compilers (GCC) with
193 * a load-long instruction expecting the short to be aligned.
194 * I bet the OSF folks stomped into this too, since they use
195 * the same disgusting hack below.. [whatelse can I do ??]
196 */
197 int bugfix;
198 #endif
199 };
200 #else LOCORE
201 /*
202 * offsets for asm boot files.
203 */
204 .set d_secsize,40
205 .set d_nsectors,44
206 .set d_ntracks,48
207 .set d_ncylinders,52
208 .set d_secpercyl,56
209 .set d_secperunit,60
210 .set d_end_,276 /* size of disk label */
211 #endif LOCORE
212
213 /* d_type values: */
214 #define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */
215 #define DTYPE_MSCP 2 /* MSCP */
216 #define DTYPE_DEC 3 /* other DEC (rk, rl) */
217 #define DTYPE_SCSI 4 /* SCSI */
218 #define DTYPE_ESDI 5 /* ESDI interface */
219 #define DTYPE_ST506 6 /* ST506 etc. */
220 #define DTYPE_FLOPPY 10 /* floppy */
221
222 #ifdef DKTYPENAMES
223 static char *dktypenames[] = {
224 "unknown",
225 "SMD",
226 "MSCP",
227 "old DEC",
228 "SCSI",
229 "ESDI",
230 "type 6",
231 "type 7",
232 "type 8",
233 "type 9",
234 "floppy",
235 0
236 };
237 #define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1)
238 #endif
239
240 /*
241 * Filesystem type and version.
242 * Used to interpret other filesystem-specific
243 * per-partition information.
244 */
245 #define FS_UNUSED 0 /* unused */
246 #define FS_SWAP 1 /* swap */
247 #define FS_V6 2 /* Sixth Edition */
248 #define FS_V7 3 /* Seventh Edition */
249 #define FS_SYSV 4 /* System V */
250 #define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */
251 #define FS_V8 6 /* Eighth Edition, 4K blocks */
252 #define FS_BSDFFS 7 /* 4.2BSD fast file system */
253
254 #ifdef DKTYPENAMES
255 static char *fstypenames[] = {
256 "unused",
257 "swap",
258 "Version 6",
259 "Version 7",
260 "System V",
261 "4.1BSD",
262 "Eighth Edition",
263 "4.2BSD",
264 0
265 };
266 #define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1)
267 #endif
268
269 /*
270 * flags shared by various drives:
271 */
272 #define D_REMOVABLE 0x01 /* removable media */
273 #define D_ECC 0x02 /* supports ECC */
274 #define D_BADSECT 0x04 /* supports bad sector forw. */
275 #define D_RAMDISK 0x08 /* disk emulator */
276 #define D_CHAIN 0x10 /* can do back-back transfers */
277
278 /*
279 * Drive data for SMD.
280 */
281 #define d_smdflags d_drivedata[0]
282 #define D_SSE 0x1 /* supports skip sectoring */
283 #define d_mindist d_drivedata[1]
284 #define d_maxdist d_drivedata[2]
285 #define d_sdist d_drivedata[3]
286
287 /*
288 * Drive data for ST506.
289 */
290 #define d_precompcyl d_drivedata[0]
291 #define d_gap3 d_drivedata[1] /* used only when formatting */
292
293 /*
294 * IBM controller info (d_precompcyl used, too)
295 */
296 #define d_step d_drivedata[2]
297
298 #ifndef LOCORE
299 /*
300 * Structure used to perform a format
301 * or other raw operation, returning data
302 * and/or register values.
303 * Register identification and format
304 * are device- and driver-dependent.
305 */
306 struct format_op {
307 char *df_buf;
308 int df_count; /* value-result */
309 recnum_t df_startblk;
310 int df_reg[8]; /* result */
311 };
312
313 /*
314 * Disk-specific ioctls.
315 */
316 /* get and set disklabel; DIOCGPART used internally */
317 #define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */
318 #define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */
319 #define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */
320
321 /* do format operation, read or write */
322 #define DIOCRFORMAT _IOWR('d', 105, struct format_op)
323 #define DIOCWFORMAT _IOWR('d', 106, struct format_op)
324
325 #define DIOCSSTEP _IOW('d', 107, int) /* set step rate */
326 #define DIOCSRETRIES _IOW('d', 108, int) /* set # of retries */
327 #define DIOCWLABEL _IOW('d', 109, int) /* write en/disable label */
328
329 #define DIOCSBAD _IOW('d', 110, struct dkbad) /* set kernel dkbad */
330
331 #endif LOCORE
332
333 #endif /* _DISK_STATUS_H_ */
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