FreeBSD/Linux Kernel Cross Reference
sys/sys/kernel.h
1 /*-
2 * Copyright (c) 1995 Terrence R. Lambert
3 * All rights reserved.
4 *
5 * Copyright (c) 1990, 1993
6 * The Regents of the University of California. All rights reserved.
7 * (c) UNIX System Laboratories, Inc.
8 * All or some portions of this file are derived from material licensed
9 * to the University of California by American Telephone and Telegraph
10 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
11 * the permission of UNIX System Laboratories, Inc.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. All advertising materials mentioning features or use of this software
22 * must display the following acknowledgement:
23 * This product includes software developed by the University of
24 * California, Berkeley and its contributors.
25 * 4. Neither the name of the University nor the names of its contributors
26 * may be used to endorse or promote products derived from this software
27 * without specific prior written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
32 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 * SUCH DAMAGE.
40 *
41 * @(#)kernel.h 8.3 (Berkeley) 1/21/94
42 * $FreeBSD: releng/6.3/sys/sys/kernel.h 173886 2007-11-24 19:45:58Z cvs2svn $
43 */
44
45 #ifndef _SYS_KERNEL_H_
46 #define _SYS_KERNEL_H_
47
48 #include <sys/linker_set.h>
49
50 #ifdef _KERNEL
51
52 /* for intrhook below */
53 #include <sys/queue.h>
54
55 /* Global variables for the kernel. */
56
57 /* 1.1 */
58 extern unsigned long hostid;
59 extern char hostname[MAXHOSTNAMELEN];
60 extern int hostnamelen;
61 extern char domainname[MAXHOSTNAMELEN];
62 extern int domainnamelen;
63 extern char kernelname[MAXPATHLEN];
64
65 extern int tick; /* usec per tick (1000000 / hz) */
66 extern int hz; /* system clock's frequency */
67 extern int psratio; /* ratio: prof / stat */
68 extern int stathz; /* statistics clock's frequency */
69 extern int profhz; /* profiling clock's frequency */
70 extern int profprocs; /* number of process's profiling */
71 extern int ticks;
72 extern int lbolt; /* once a second sleep address */
73
74 extern int tz_minuteswest;
75 extern int tz_dsttime;
76
77 #endif /* _KERNEL */
78
79 /*
80 * Enumerated types for known system startup interfaces.
81 *
82 * Startup occurs in ascending numeric order; the list entries are
83 * sorted prior to attempting startup to guarantee order. Items
84 * of the same level are arbitrated for order based on the 'order'
85 * element.
86 *
87 * These numbers are arbitrary and are chosen ONLY for ordering; the
88 * enumeration values are explicit rather than implicit to provide
89 * for binary compatibility with inserted elements.
90 *
91 * The SI_SUB_RUN_SCHEDULER value must have the highest lexical value.
92 *
93 * The SI_SUB_CONSOLE and SI_SUB_SWAP values represent values used by
94 * the BSD 4.4Lite but not by FreeBSD; they are maintained in dependent
95 * order to support porting.
96 *
97 * The SI_SUB_PROTO_BEGIN and SI_SUB_PROTO_END bracket a range of
98 * initializations to take place at splimp(). This is a historical
99 * wart that should be removed -- probably running everything at
100 * splimp() until the first init that doesn't want it is the correct
101 * fix. They are currently present to ensure historical behavior.
102 */
103 enum sysinit_sub_id {
104 SI_SUB_DUMMY = 0x0000000, /* not executed; for linker*/
105 SI_SUB_DONE = 0x0000001, /* processed*/
106 SI_SUB_TUNABLES = 0x0700000, /* establish tunable values */
107 SI_SUB_CONSOLE = 0x0800000, /* console*/
108 SI_SUB_COPYRIGHT = 0x0800001, /* first use of console*/
109 SI_SUB_SETTINGS = 0x0880000, /* check and recheck settings */
110 SI_SUB_MTX_POOL_STATIC = 0x0900000, /* static mutex pool */
111 SI_SUB_LOCKMGR = 0x0980000, /* lockmgr locks */
112 SI_SUB_VM = 0x1000000, /* virtual memory system init*/
113 SI_SUB_KMEM = 0x1800000, /* kernel memory*/
114 SI_SUB_KVM_RSRC = 0x1A00000, /* kvm operational limits*/
115 SI_SUB_WITNESS = 0x1A80000, /* witness initialization */
116 SI_SUB_MTX_POOL_DYNAMIC = 0x1AC0000, /* dynamic mutex pool */
117 SI_SUB_LOCK = 0x1B00000, /* various locks */
118 SI_SUB_EVENTHANDLER = 0x1C00000, /* eventhandler init */
119 SI_SUB_KLD = 0x2000000, /* KLD and module setup */
120 SI_SUB_CPU = 0x2100000, /* CPU resource(s)*/
121 SI_SUB_MAC = 0x2180000, /* TrustedBSD MAC subsystem */
122 SI_SUB_MAC_POLICY = 0x21C0000, /* TrustedBSD MAC policies */
123 SI_SUB_MAC_LATE = 0x21D0000, /* TrustedBSD MAC subsystem */
124 SI_SUB_INTRINSIC = 0x2200000, /* proc 0*/
125 SI_SUB_VM_CONF = 0x2300000, /* config VM, set limits*/
126 SI_SUB_RUN_QUEUE = 0x2400000, /* set up run queue*/
127 SI_SUB_KTRACE = 0x2480000, /* ktrace */
128 SI_SUB_AUDIT = 0x24C0000, /* audit */
129 SI_SUB_CREATE_INIT = 0x2500000, /* create init process*/
130 SI_SUB_SCHED_IDLE = 0x2600000, /* required idle procs */
131 SI_SUB_MBUF = 0x2700000, /* mbuf subsystem */
132 SI_SUB_INTR = 0x2800000, /* interrupt threads */
133 SI_SUB_SOFTINTR = 0x2800001, /* start soft interrupt thread */
134 SI_SUB_ACL = 0x2900000, /* start for filesystem ACLs */
135 SI_SUB_DEVFS = 0x2F00000, /* devfs ready for devices */
136 SI_SUB_INIT_IF = 0x3000000, /* prep for net interfaces */
137 SI_SUB_NETGRAPH = 0x3010000, /* Let Netgraph initialize */
138 SI_SUB_DRIVERS = 0x3100000, /* Let Drivers initialize */
139 SI_SUB_CONFIGURE = 0x3800000, /* Configure devices */
140 SI_SUB_VFS = 0x4000000, /* virtual filesystem*/
141 SI_SUB_CLOCKS = 0x4800000, /* real time and stat clocks*/
142 SI_SUB_CLIST = 0x5800000, /* clists*/
143 SI_SUB_SYSV_SHM = 0x6400000, /* System V shared memory*/
144 SI_SUB_SYSV_SEM = 0x6800000, /* System V semaphores*/
145 SI_SUB_SYSV_MSG = 0x6C00000, /* System V message queues*/
146 SI_SUB_P1003_1B = 0x6E00000, /* P1003.1B realtime */
147 SI_SUB_PSEUDO = 0x7000000, /* pseudo devices*/
148 SI_SUB_EXEC = 0x7400000, /* execve() handlers */
149 SI_SUB_PROTO_BEGIN = 0x8000000, /* XXX: set splimp (kludge)*/
150 SI_SUB_PROTO_IF = 0x8400000, /* interfaces*/
151 SI_SUB_PROTO_DOMAIN = 0x8800000, /* domains (address families?)*/
152 SI_SUB_PROTO_IFATTACHDOMAIN = 0x8800001, /* domain dependent data init*/
153 SI_SUB_PROTO_END = 0x8ffffff, /* XXX: set splx (kludge)*/
154 SI_SUB_KPROF = 0x9000000, /* kernel profiling*/
155 SI_SUB_KICK_SCHEDULER = 0xa000000, /* start the timeout events*/
156 SI_SUB_INT_CONFIG_HOOKS = 0xa800000, /* Interrupts enabled config */
157 SI_SUB_ROOT_CONF = 0xb000000, /* Find root devices */
158 SI_SUB_DUMP_CONF = 0xb200000, /* Find dump devices */
159 SI_SUB_RAID = 0xb380000, /* Configure GEOM classes */
160 SI_SUB_MOUNT_ROOT = 0xb400000, /* root mount*/
161 SI_SUB_SWAP = 0xc000000, /* swap */
162 SI_SUB_INTRINSIC_POST = 0xd000000, /* proc 0 cleanup*/
163 SI_SUB_SYSCALLS = 0xd800000, /* register system calls */
164 SI_SUB_KTHREAD_INIT = 0xe000000, /* init process*/
165 SI_SUB_KTHREAD_PAGE = 0xe400000, /* pageout daemon*/
166 SI_SUB_KTHREAD_VM = 0xe800000, /* vm daemon*/
167 SI_SUB_KTHREAD_BUF = 0xea00000, /* buffer daemon*/
168 SI_SUB_KTHREAD_UPDATE = 0xec00000, /* update daemon*/
169 SI_SUB_KTHREAD_IDLE = 0xee00000, /* idle procs*/
170 SI_SUB_SMP = 0xf000000, /* start the APs*/
171 SI_SUB_RUN_SCHEDULER = 0xfffffff /* scheduler*/
172 };
173
174
175 /*
176 * Some enumerated orders; "ANY" sorts last.
177 */
178 enum sysinit_elem_order {
179 SI_ORDER_FIRST = 0x0000000, /* first*/
180 SI_ORDER_SECOND = 0x0000001, /* second*/
181 SI_ORDER_THIRD = 0x0000002, /* third*/
182 SI_ORDER_MIDDLE = 0x1000000, /* somewhere in the middle */
183 SI_ORDER_ANY = 0xfffffff /* last*/
184 };
185
186
187 /*
188 * A system initialization call instance
189 *
190 * At the moment there is one instance of sysinit. We probably do not
191 * want two which is why this code is if'd out, but we definitely want
192 * to discern SYSINIT's which take non-constant data pointers and
193 * SYSINIT's which take constant data pointers,
194 *
195 * The C_* macros take functions expecting const void * arguments
196 * while the non-C_* macros take functions expecting just void * arguments.
197 *
198 * With -Wcast-qual on, the compiler issues warnings:
199 * - if we pass non-const data or functions taking non-const data
200 * to a C_* macro.
201 *
202 * - if we pass const data to the normal macros
203 *
204 * However, no warning is issued if we pass a function taking const data
205 * through a normal non-const macro. This is ok because the function is
206 * saying it won't modify the data so we don't care whether the data is
207 * modifiable or not.
208 */
209
210 typedef void (*sysinit_nfunc_t)(void *);
211 typedef void (*sysinit_cfunc_t)(const void *);
212
213 struct sysinit {
214 enum sysinit_sub_id subsystem; /* subsystem identifier*/
215 enum sysinit_elem_order order; /* init order within subsystem*/
216 sysinit_cfunc_t func; /* function */
217 const void *udata; /* multiplexer/argument */
218 };
219
220 /*
221 * Default: no special processing
222 *
223 * The C_ version of SYSINIT is for data pointers to const
224 * data ( and functions taking data pointers to const data ).
225 * At the moment it is no different from SYSINIT and thus
226 * still results in warnings.
227 *
228 * The casts are necessary to have the compiler produce the
229 * correct warnings when -Wcast-qual is used.
230 *
231 */
232 #define C_SYSINIT(uniquifier, subsystem, order, func, ident) \
233 static struct sysinit uniquifier ## _sys_init = { \
234 subsystem, \
235 order, \
236 func, \
237 (ident) \
238 }; \
239 DATA_SET(sysinit_set,uniquifier ## _sys_init);
240
241 #define SYSINIT(uniquifier, subsystem, order, func, ident) \
242 C_SYSINIT(uniquifier, subsystem, order, \
243 (sysinit_cfunc_t)(sysinit_nfunc_t)func, (void *)(ident))
244
245 /*
246 * Called on module unload: no special processing
247 */
248 #define C_SYSUNINIT(uniquifier, subsystem, order, func, ident) \
249 static struct sysinit uniquifier ## _sys_uninit = { \
250 subsystem, \
251 order, \
252 func, \
253 (ident) \
254 }; \
255 DATA_SET(sysuninit_set,uniquifier ## _sys_uninit)
256
257 #define SYSUNINIT(uniquifier, subsystem, order, func, ident) \
258 C_SYSUNINIT(uniquifier, subsystem, order, \
259 (sysinit_cfunc_t)(sysinit_nfunc_t)func, (void *)(ident))
260
261 void sysinit_add(struct sysinit **set, struct sysinit **set_end);
262
263 /*
264 * Infrastructure for tunable 'constants'. Value may be specified at compile
265 * time or kernel load time. Rules relating tunables together can be placed
266 * in a SYSINIT function at SI_SUB_TUNABLES with SI_ORDER_LAST.
267 *
268 * WARNING: developers should never use the reserved suffixes specified in
269 * loader.conf(5) for any tunables or conflicts will result.
270 */
271
272 /*
273 * int
274 * please avoid using for new tunables!
275 */
276 extern void tunable_int_init(void *);
277 struct tunable_int {
278 const char *path;
279 int *var;
280 };
281 #define TUNABLE_INT(path, var) \
282 static struct tunable_int __CONCAT(__tunable_int_, __LINE__) = { \
283 (path), \
284 (var), \
285 }; \
286 SYSINIT(__CONCAT(__Tunable_init_, __LINE__), \
287 SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_int_init, \
288 &__CONCAT(__tunable_int_, __LINE__))
289
290 #define TUNABLE_INT_FETCH(path, var) getenv_int((path), (var))
291
292 /*
293 * long
294 */
295 extern void tunable_long_init(void *);
296 struct tunable_long {
297 const char *path;
298 long *var;
299 };
300 #define TUNABLE_LONG(path, var) \
301 static struct tunable_long __CONCAT(__tunable_long_, __LINE__) = { \
302 (path), \
303 (var), \
304 }; \
305 SYSINIT(__CONCAT(__Tunable_init_, __LINE__), \
306 SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_long_init,\
307 &__CONCAT(__tunable_long_, __LINE__))
308
309 #define TUNABLE_LONG_FETCH(path, var) getenv_long((path), (var))
310
311 /*
312 * unsigned long
313 */
314 extern void tunable_ulong_init(void *);
315 struct tunable_ulong {
316 const char *path;
317 unsigned long *var;
318 };
319 #define TUNABLE_ULONG(path, var) \
320 static struct tunable_ulong __CONCAT(__tunable_ulong_, __LINE__) = { \
321 (path), \
322 (var), \
323 }; \
324 SYSINIT(__CONCAT(__Tunable_init_, __LINE__), \
325 SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_ulong_init, \
326 &__CONCAT(__tunable_ulong_, __LINE__))
327
328 #define TUNABLE_ULONG_FETCH(path, var) getenv_ulong((path), (var))
329
330 extern void tunable_str_init(void *);
331 struct tunable_str {
332 const char *path;
333 char *var;
334 int size;
335 };
336 #define TUNABLE_STR(path, var, size) \
337 static struct tunable_str __CONCAT(__tunable_str_, __LINE__) = { \
338 (path), \
339 (var), \
340 (size), \
341 }; \
342 SYSINIT(__CONCAT(__Tunable_init_, __LINE__), \
343 SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_str_init, \
344 &__CONCAT(__tunable_str_, __LINE__))
345
346 #define TUNABLE_STR_FETCH(path, var, size) \
347 getenv_string((path), (var), (size))
348
349 void net_warn_not_mpsafe(const char *component);
350 #define NET_NEEDS_GIANT(component) \
351 SYSINIT(__CONCAT(__net_warn_not_mpsafe_, __LINE__), \
352 SI_SUB_SETTINGS, SI_ORDER_SECOND, net_warn_not_mpsafe, component);
353
354 struct intr_config_hook {
355 TAILQ_ENTRY(intr_config_hook) ich_links;
356 void (*ich_func)(void *arg);
357 void *ich_arg;
358 };
359
360 int config_intrhook_establish(struct intr_config_hook *hook);
361 void config_intrhook_disestablish(struct intr_config_hook *hook);
362
363 #endif /* !_SYS_KERNEL_H_*/
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