FreeBSD/Linux Kernel Cross Reference
sys/sys/conf.h
1 /*-
2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 * Copyright (c) 2000
5 * Poul-Henning Kamp. All rights reserved.
6 * (c) UNIX System Laboratories, Inc.
7 * All or some portions of this file are derived from material licensed
8 * to the University of California by American Telephone and Telegraph
9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10 * the permission of UNIX System Laboratories, Inc.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. All advertising materials mentioning features or use of this software
21 * must display the following acknowledgement:
22 * This product includes software developed by the University of
23 * California, Berkeley and its contributors.
24 * 4. Neither the name of the University nor the names of its contributors
25 * may be used to endorse or promote products derived from this software
26 * without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * SUCH DAMAGE.
39 *
40 * @(#)conf.h 8.5 (Berkeley) 1/9/95
41 * $FreeBSD: releng/5.0/sys/sys/conf.h 108007 2002-12-17 22:36:33Z mckusick $
42 */
43
44 #ifndef _SYS_CONF_H_
45 #define _SYS_CONF_H_
46
47 #ifdef _KERNEL
48 #include <sys/eventhandler.h>
49
50 struct tty;
51 struct disk;
52 struct vnode;
53 struct buf;
54 TAILQ_HEAD(snaphead, inode);
55
56 struct cdev {
57 u_int si_flags;
58 #define SI_STASHED 0x0001 /* created in stashed storage */
59 #define SI_ALIAS 0x0002 /* carrier of alias name */
60 #define SI_NAMED 0x0004 /* make_dev{_alias} has been called */
61 #define SI_CHEAPCLONE 0x0008 /* can be removed_dev'ed when vnode reclaims */
62 #define SI_CHILD 0x0010 /* child of another dev_t */
63 #define SI_DEVOPEN 0x0020 /* opened by device */
64 #define SI_CONSOPEN 0x0040 /* opened by console */
65 #define SI_DUMPDEV 0x0080 /* is kernel dumpdev */
66 struct timespec si_atime;
67 struct timespec si_ctime;
68 struct timespec si_mtime;
69 udev_t si_udev;
70 LIST_ENTRY(cdev) si_hash;
71 SLIST_HEAD(, vnode) si_hlist;
72 LIST_HEAD(, cdev) si_children;
73 LIST_ENTRY(cdev) si_siblings;
74 dev_t si_parent;
75 u_int si_inode;
76 char si_name[SPECNAMELEN + 1];
77 void *si_drv1, *si_drv2;
78 struct cdevsw *si_devsw;
79 int si_iosize_max; /* maximum I/O size (for physio &al) */
80 uid_t si_uid;
81 gid_t si_gid;
82 mode_t si_mode;
83 u_long si_usecount;
84 union {
85 struct {
86 struct tty *__sit_tty;
87 } __si_tty;
88 struct {
89 struct disk *__sid_disk;
90 struct mount *__sid_mountpoint;
91 int __sid_bsize_phys; /* min physical block size */
92 int __sid_bsize_best; /* optimal block size */
93 struct snaphead __sid_snapshots;
94 daddr_t __sid_snaplistsize; /* size of snapblklist. */
95 daddr_t *__sid_snapblklist; /* known snapshot blocks. */
96 int (*__sid_copyonwrite)(struct vnode *, struct buf *);
97 } __si_disk;
98 } __si_u;
99 };
100
101 #define si_tty __si_u.__si_tty.__sit_tty
102 #define si_disk __si_u.__si_disk.__sid_disk
103 #define si_mountpoint __si_u.__si_disk.__sid_mountpoint
104 #define si_bsize_phys __si_u.__si_disk.__sid_bsize_phys
105 #define si_bsize_best __si_u.__si_disk.__sid_bsize_best
106 #define si_snapshots __si_u.__si_disk.__sid_snapshots
107 #define si_snaplistsize __si_u.__si_disk.__sid_snaplistsize
108 #define si_snapblklist __si_u.__si_disk.__sid_snapblklist
109 #define si_copyonwrite __si_u.__si_disk.__sid_copyonwrite
110
111 /*
112 * Special device management
113 */
114 #define SPECHSZ 64
115 #define SPECHASH(rdev) (((unsigned)(minor(rdev)))%SPECHSZ)
116
117 /*
118 * Definitions of device driver entry switches
119 */
120
121 struct bio;
122 struct buf;
123 struct thread;
124 struct uio;
125 struct knote;
126
127 /*
128 * Note: d_thread_t is provided as a transition aid for those drivers
129 * that treat struct proc/struct thread as an opaque data type and
130 * exist in substantially the same form in both 4.x and 5.x. Writers
131 * of drivers that dips into the d_thread_t structure should use
132 * struct thread or struct proc as appropriate for the version of the
133 * OS they are using. It is provided in lieu of each device driver
134 * inventing its own way of doing this. While it does violate style(9)
135 * in a number of ways, this violation is deemed to be less
136 * important than the benefits that a uniform API between releases
137 * gives.
138 *
139 * Users of struct thread/struct proc that aren't device drivers should
140 * not use d_thread_t.
141 */
142
143 typedef struct thread d_thread_t;
144
145 typedef int d_open_t(dev_t dev, int oflags, int devtype, struct thread *td);
146 typedef int d_close_t(dev_t dev, int fflag, int devtype, struct thread *td);
147 typedef void d_strategy_t(struct bio *bp);
148 typedef int d_ioctl_t(dev_t dev, u_long cmd, caddr_t data,
149 int fflag, struct thread *td);
150 typedef int d_dump_t(dev_t dev,void *virtual, vm_offset_t physical, off_t offset, size_t length);
151 typedef int d_psize_t(dev_t dev);
152
153 typedef int d_read_t(dev_t dev, struct uio *uio, int ioflag);
154 typedef int d_write_t(dev_t dev, struct uio *uio, int ioflag);
155 typedef int d_poll_t(dev_t dev, int events, struct thread *td);
156 typedef int d_kqfilter_t(dev_t dev, struct knote *kn);
157 typedef int d_mmap_t(dev_t dev, vm_offset_t offset, int nprot);
158
159 typedef int l_open_t(dev_t dev, struct tty *tp);
160 typedef int l_close_t(struct tty *tp, int flag);
161 typedef int l_read_t(struct tty *tp, struct uio *uio, int flag);
162 typedef int l_write_t(struct tty *tp, struct uio *uio, int flag);
163 typedef int l_ioctl_t(struct tty *tp, u_long cmd, caddr_t data,
164 int flag, struct thread *td);
165 typedef int l_rint_t(int c, struct tty *tp);
166 typedef int l_start_t(struct tty *tp);
167 typedef int l_modem_t(struct tty *tp, int flag);
168
169 /*
170 * XXX: The dummy argument can be used to do what strategy1() never
171 * did anywhere: Create a per device flag to lock the device during
172 * label/slice surgery, all calls with a dummy == 0 gets stalled on
173 * a queue somewhere, whereas dummy == 1 are let through. Once out
174 * of surgery, reset the flag and restart all the stuff on the stall
175 * queue.
176 */
177 #define BIO_STRATEGY(bp, dummy) \
178 do { \
179 if ((!(bp)->bio_cmd) || ((bp)->bio_cmd & ((bp)->bio_cmd - 1))) \
180 Debugger("bio_cmd botch"); \
181 (*devsw((bp)->bio_dev)->d_strategy)(bp); \
182 } while (0)
183
184 #define DEV_STRATEGY(bp, dummy) \
185 do { \
186 if ((bp)->b_flags & B_PHYS) \
187 (bp)->b_io.bio_offset = (bp)->b_offset; \
188 else \
189 (bp)->b_io.bio_offset = dbtob((bp)->b_blkno); \
190 (bp)->b_io.bio_done = bufdonebio; \
191 (bp)->b_io.bio_caller2 = (bp); \
192 BIO_STRATEGY(&(bp)->b_io, dummy); \
193 } while (0)
194
195 #endif /* _KERNEL */
196
197 /*
198 * Types for d_flags.
199 */
200 #define D_TAPE 0x0001
201 #define D_DISK 0x0002
202 #define D_TTY 0x0004
203 #define D_MEM 0x0008
204
205 #ifdef _KERNEL
206
207 #define D_TYPEMASK 0xffff
208
209 /*
210 * Flags for d_flags.
211 */
212 #define D_MEMDISK 0x00010000 /* memory type disk */
213 #define D_NAGGED 0x00020000 /* nagged about missing make_dev() */
214 #define D_CANFREE 0x00040000 /* can free blocks */
215 #define D_TRACKCLOSE 0x00080000 /* track all closes */
216 #define D_MMAP_ANON 0x00100000 /* special treatment in vm_mmap.c */
217 #define D_KQFILTER 0x00200000 /* has kqfilter entry */
218 #define D_NOGIANT 0x00400000 /* Doesn't want Giant */
219
220 /*
221 * Character device switch table
222 */
223 struct cdevsw {
224 d_open_t *d_open;
225 d_close_t *d_close;
226 d_read_t *d_read;
227 d_write_t *d_write;
228 d_ioctl_t *d_ioctl;
229 d_poll_t *d_poll;
230 d_mmap_t *d_mmap;
231 d_strategy_t *d_strategy;
232 const char *d_name; /* base device name, e.g. 'vn' */
233 int d_maj;
234 d_dump_t *d_dump;
235 d_psize_t *d_psize;
236 u_int d_flags;
237 /* additions below are not binary compatible with 4.2 and below */
238 d_kqfilter_t *d_kqfilter;
239 };
240
241 /*
242 * Line discipline switch table
243 */
244 struct linesw {
245 l_open_t *l_open;
246 l_close_t *l_close;
247 l_read_t *l_read;
248 l_write_t *l_write;
249 l_ioctl_t *l_ioctl;
250 l_rint_t *l_rint;
251 l_start_t *l_start;
252 l_modem_t *l_modem;
253 u_char l_hotchar;
254 };
255
256 extern struct linesw linesw[];
257 extern int nlinesw;
258
259 int ldisc_register(int , struct linesw *);
260 void ldisc_deregister(int);
261 #define LDISC_LOAD -1 /* Loadable line discipline */
262 #endif /* _KERNEL */
263
264 /*
265 * Swap device table
266 */
267 struct swdevt {
268 udev_t sw_dev; /* For quasibogus swapdev reporting */
269 int sw_flags;
270 int sw_nblks;
271 int sw_used;
272 struct vnode *sw_vp;
273 dev_t sw_device;
274 };
275 #define SW_FREED 0x01
276 #define SW_SEQUENTIAL 0x02
277 #define sw_freed sw_flags /* XXX compat */
278
279 #ifdef _KERNEL
280 d_open_t noopen;
281 d_close_t noclose;
282 d_read_t noread;
283 d_write_t nowrite;
284 d_ioctl_t noioctl;
285 d_mmap_t nommap;
286 d_kqfilter_t nokqfilter;
287 #define nostrategy ((d_strategy_t *)NULL)
288 #define nopoll seltrue
289
290 d_dump_t nodump;
291
292 #define NUMCDEVSW 256
293
294 /*
295 * nopsize is little used, so not worth having dummy functions for.
296 */
297 #define nopsize ((d_psize_t *)NULL)
298
299 d_open_t nullopen;
300 d_close_t nullclose;
301
302 l_ioctl_t l_nullioctl;
303 l_read_t l_noread;
304 l_write_t l_nowrite;
305
306 struct module;
307
308 struct devsw_module_data {
309 int (*chainevh)(struct module *, int, void *); /* next handler */
310 void *chainarg; /* arg for next event handler */
311 /* Do not initialize fields hereafter */
312 };
313
314 #define DEV_MODULE(name, evh, arg) \
315 static moduledata_t name##_mod = { \
316 #name, \
317 evh, \
318 arg \
319 }; \
320 DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE)
321
322
323 int cdevsw_add(struct cdevsw *_new);
324 int cdevsw_remove(struct cdevsw *_old);
325 int count_dev(dev_t _dev);
326 void destroy_dev(dev_t _dev);
327 void revoke_and_destroy_dev(dev_t _dev);
328 struct cdevsw *devsw(dev_t _dev);
329 const char *devtoname(dev_t _dev);
330 int dev_named(dev_t _pdev, const char *_name);
331 void dev_depends(dev_t _pdev, dev_t _cdev);
332 void freedev(dev_t _dev);
333 int iszerodev(dev_t _dev);
334 dev_t makebdev(int _maj, int _min);
335 dev_t make_dev(struct cdevsw *_devsw, int _minor, uid_t _uid, gid_t _gid,
336 int _perms, const char *_fmt, ...) __printflike(6, 7);
337 dev_t make_dev_alias(dev_t _pdev, const char *_fmt, ...) __printflike(2, 3);
338 int dev2unit(dev_t _dev);
339 int unit2minor(int _unit);
340 void setconf(void);
341 dev_t getdiskbyname(char *_name);
342
343 /* This is type of the function DEVFS uses to hook into the kernel with */
344 typedef void devfs_create_t(dev_t dev);
345 typedef void devfs_destroy_t(dev_t dev);
346
347 extern devfs_create_t *devfs_create_hook;
348 extern devfs_destroy_t *devfs_destroy_hook;
349 extern int devfs_present;
350
351 #define UID_ROOT 0
352 #define UID_BIN 3
353 #define UID_UUCP 66
354
355 #define GID_WHEEL 0
356 #define GID_KMEM 2
357 #define GID_OPERATOR 5
358 #define GID_BIN 7
359 #define GID_GAMES 13
360 #define GID_DIALER 68
361
362 typedef void (*dev_clone_fn)(void *arg, char *name, int namelen, dev_t *result);
363
364 int dev_stdclone(char *_name, char **_namep, const char *_stem, int *_unit);
365 EVENTHANDLER_DECLARE(dev_clone, dev_clone_fn);
366
367 /* Stuff relating to kernel-dump */
368
369 typedef int dumper_t(
370 void *priv, /* Private to the driver. */
371 void *virtual, /* Virtual (mapped) address. */
372 vm_offset_t physical, /* Physical address of virtual. */
373 off_t offset, /* Byte-offset to write at. */
374 size_t length); /* Number of bytes to dump. */
375
376 struct dumperinfo {
377 dumper_t *dumper; /* Dumping function. */
378 void *priv; /* Private parts. */
379 u_int blocksize; /* Size of block in bytes. */
380 off_t mediaoffset; /* Initial offset in bytes. */
381 off_t mediasize; /* Space available in bytes. */
382 };
383
384 int set_dumper(struct dumperinfo *);
385 void dumpsys(struct dumperinfo *);
386 extern int dumping; /* system is dumping */
387
388 #endif /* _KERNEL */
389
390 #endif /* !_SYS_CONF_H_ */
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