Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/sys/kernel.h
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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: src/sys/sys/kernel.h,v 1.117.2.3 2005/02/14 11:23:43 obrien Exp $ 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_CREATE_INIT = 0x2500000, /* create init process*/ 129 SI_SUB_SCHED_IDLE = 0x2600000, /* required idle procs */ 130 SI_SUB_MBUF = 0x2700000, /* mbuf subsystem */ 131 SI_SUB_INTR = 0x2800000, /* interrupt threads */ 132 SI_SUB_SOFTINTR = 0x2800001, /* start soft interrupt thread */ 133 SI_SUB_DEVFS = 0x2F00000, /* devfs ready for devices */ 134 SI_SUB_INIT_IF = 0x3000000, /* prep for net interfaces */ 135 SI_SUB_NETGRAPH = 0x3010000, /* Let Netgraph initialize */ 136 SI_SUB_DRIVERS = 0x3100000, /* Let Drivers initialize */ 137 SI_SUB_CONFIGURE = 0x3800000, /* Configure devices */ 138 SI_SUB_VFS = 0x4000000, /* virtual filesystem*/ 139 SI_SUB_CLOCKS = 0x4800000, /* real time and stat clocks*/ 140 SI_SUB_CLIST = 0x5800000, /* clists*/ 141 SI_SUB_SYSV_SHM = 0x6400000, /* System V shared memory*/ 142 SI_SUB_SYSV_SEM = 0x6800000, /* System V semaphores*/ 143 SI_SUB_SYSV_MSG = 0x6C00000, /* System V message queues*/ 144 SI_SUB_P1003_1B = 0x6E00000, /* P1003.1B realtime */ 145 SI_SUB_PSEUDO = 0x7000000, /* pseudo devices*/ 146 SI_SUB_EXEC = 0x7400000, /* execve() handlers */ 147 SI_SUB_PROTO_BEGIN = 0x8000000, /* XXX: set splimp (kludge)*/ 148 SI_SUB_PROTO_IF = 0x8400000, /* interfaces*/ 149 SI_SUB_PROTO_DOMAIN = 0x8800000, /* domains (address families?)*/ 150 SI_SUB_PROTO_IFATTACHDOMAIN = 0x8800001, /* domain dependent data init*/ 151 SI_SUB_PROTO_END = 0x8ffffff, /* XXX: set splx (kludge)*/ 152 SI_SUB_KPROF = 0x9000000, /* kernel profiling*/ 153 SI_SUB_KICK_SCHEDULER = 0xa000000, /* start the timeout events*/ 154 SI_SUB_INT_CONFIG_HOOKS = 0xa800000, /* Interrupts enabled config */ 155 SI_SUB_ROOT_CONF = 0xb000000, /* Find root devices */ 156 SI_SUB_DUMP_CONF = 0xb200000, /* Find dump devices */ 157 SI_SUB_RAID = 0xb380000, /* Configure RAIDframe or Vinum */ 158 SI_SUB_MOUNT_ROOT = 0xb400000, /* root mount*/ 159 SI_SUB_SWAP = 0xc000000, /* swap */ 160 SI_SUB_INTRINSIC_POST = 0xd000000, /* proc 0 cleanup*/ 161 SI_SUB_KTHREAD_INIT = 0xe000000, /* init process*/ 162 SI_SUB_KTHREAD_PAGE = 0xe400000, /* pageout daemon*/ 163 SI_SUB_KTHREAD_VM = 0xe800000, /* vm daemon*/ 164 SI_SUB_KTHREAD_BUF = 0xea00000, /* buffer daemon*/ 165 SI_SUB_KTHREAD_UPDATE = 0xec00000, /* update daemon*/ 166 SI_SUB_KTHREAD_IDLE = 0xee00000, /* idle procs*/ 167 SI_SUB_SMP = 0xf000000, /* start the APs*/ 168 SI_SUB_RUN_SCHEDULER = 0xfffffff /* scheduler*/ 169 }; 170 171 172 /* 173 * Some enumerated orders; "ANY" sorts last. 174 */ 175 enum sysinit_elem_order { 176 SI_ORDER_FIRST = 0x0000000, /* first*/ 177 SI_ORDER_SECOND = 0x0000001, /* second*/ 178 SI_ORDER_THIRD = 0x0000002, /* third*/ 179 SI_ORDER_MIDDLE = 0x1000000, /* somewhere in the middle */ 180 SI_ORDER_ANY = 0xfffffff /* last*/ 181 }; 182 183 184 /* 185 * A system initialization call instance 186 * 187 * At the moment there is one instance of sysinit. We probably do not 188 * want two which is why this code is if'd out, but we definitely want 189 * to discern SYSINIT's which take non-constant data pointers and 190 * SYSINIT's which take constant data pointers, 191 * 192 * The C_* macros take functions expecting const void * arguments 193 * while the non-C_* macros take functions expecting just void * arguments. 194 * 195 * With -Wcast-qual on, the compiler issues warnings: 196 * - if we pass non-const data or functions taking non-const data 197 * to a C_* macro. 198 * 199 * - if we pass const data to the normal macros 200 * 201 * However, no warning is issued if we pass a function taking const data 202 * through a normal non-const macro. This is ok because the function is 203 * saying it won't modify the data so we don't care whether the data is 204 * modifiable or not. 205 */ 206 207 typedef void (*sysinit_nfunc_t)(void *); 208 typedef void (*sysinit_cfunc_t)(const void *); 209 210 struct sysinit { 211 enum sysinit_sub_id subsystem; /* subsystem identifier*/ 212 enum sysinit_elem_order order; /* init order within subsystem*/ 213 sysinit_cfunc_t func; /* function */ 214 const void *udata; /* multiplexer/argument */ 215 }; 216 217 /* 218 * Default: no special processing 219 * 220 * The C_ version of SYSINIT is for data pointers to const 221 * data ( and functions taking data pointers to const data ). 222 * At the moment it is no different from SYSINIT and thus 223 * still results in warnings. 224 * 225 * The casts are necessary to have the compiler produce the 226 * correct warnings when -Wcast-qual is used. 227 * 228 */ 229 #define C_SYSINIT(uniquifier, subsystem, order, func, ident) \ 230 static struct sysinit uniquifier ## _sys_init = { \ 231 subsystem, \ 232 order, \ 233 func, \ 234 (ident) \ 235 }; \ 236 DATA_SET(sysinit_set,uniquifier ## _sys_init); 237 238 #define SYSINIT(uniquifier, subsystem, order, func, ident) \ 239 C_SYSINIT(uniquifier, subsystem, order, \ 240 (sysinit_cfunc_t)(sysinit_nfunc_t)func, (void *)(ident)) 241 242 /* 243 * Called on module unload: no special processing 244 */ 245 #define C_SYSUNINIT(uniquifier, subsystem, order, func, ident) \ 246 static struct sysinit uniquifier ## _sys_uninit = { \ 247 subsystem, \ 248 order, \ 249 func, \ 250 (ident) \ 251 }; \ 252 DATA_SET(sysuninit_set,uniquifier ## _sys_uninit) 253 254 #define SYSUNINIT(uniquifier, subsystem, order, func, ident) \ 255 C_SYSUNINIT(uniquifier, subsystem, order, \ 256 (sysinit_cfunc_t)(sysinit_nfunc_t)func, (void *)(ident)) 257 258 void sysinit_add(struct sysinit **set, struct sysinit **set_end); 259 260 /* 261 * Infrastructure for tunable 'constants'. Value may be specified at compile 262 * time or kernel load time. Rules relating tunables together can be placed 263 * in a SYSINIT function at SI_SUB_TUNABLES with SI_ORDER_LAST. 264 * 265 * WARNING: developers should never use the reserved suffixes specified in 266 * loader.conf(5) for any tunables or conflicts will result. 267 */ 268 269 /* 270 * int 271 * please avoid using for new tunables! 272 */ 273 extern void tunable_int_init(void *); 274 struct tunable_int { 275 const char *path; 276 int *var; 277 }; 278 #define TUNABLE_INT(path, var) \ 279 _TUNABLE_INT((path), (var), __LINE__) 280 #define _TUNABLE_INT(path, var, line) \ 281 __TUNABLE_INT((path), (var), line) 282 283 #define __TUNABLE_INT(path, var, line) \ 284 static struct tunable_int __tunable_int_ ## line = { \ 285 path, \ 286 var, \ 287 }; \ 288 SYSINIT(__Tunable_init_ ## line, SI_SUB_TUNABLES, SI_ORDER_MIDDLE, \ 289 tunable_int_init, &__tunable_int_ ## line) 290 291 #define TUNABLE_INT_FETCH(path, var) getenv_int((path), (var)) 292 293 /* 294 * long 295 */ 296 extern void tunable_long_init(void *); 297 struct tunable_long { 298 const char *path; 299 long *var; 300 }; 301 #define TUNABLE_LONG(path, var) \ 302 _TUNABLE_LONG((path), (var), __LINE__) 303 #define _TUNABLE_LONG(path, var, line) \ 304 __TUNABLE_LONG((path), (var), line) 305 306 #define __TUNABLE_LONG(path, var, line) \ 307 static struct tunable_long __tunable_long_ ## line = { \ 308 path, \ 309 var, \ 310 }; \ 311 SYSINIT(__Tunable_init_ ## line, SI_SUB_TUNABLES, SI_ORDER_MIDDLE, \ 312 tunable_long_init, &__tunable_long_ ## line) 313 314 #define TUNABLE_LONG_FETCH(path, var) getenv_long((path), (var)) 315 316 /* 317 * unsigned long 318 */ 319 extern void tunable_ulong_init(void *); 320 struct tunable_ulong { 321 const char *path; 322 unsigned long *var; 323 }; 324 #define TUNABLE_ULONG(path, var) \ 325 _TUNABLE_ULONG((path), (var), __LINE__) 326 #define _TUNABLE_ULONG(path, var, line) \ 327 __TUNABLE_ULONG((path), (var), line) 328 329 #define __TUNABLE_ULONG(path, var, line) \ 330 static struct tunable_ulong __tunable_ulong_ ## line = {\ 331 path, \ 332 var, \ 333 }; \ 334 SYSINIT(__Tunable_init_ ## line, SI_SUB_TUNABLES, SI_ORDER_MIDDLE, \ 335 tunable_ulong_init, &__tunable_ulong_ ## line) 336 337 #define TUNABLE_ULONG_FETCH(path, var) getenv_ulong((path), (var)) 338 339 /* 340 * Quad (64-bit) 341 * please avoid using for new tunables! 342 */ 343 extern void tunable_quad_init(void *); 344 struct tunable_quad { 345 const char *path; 346 quad_t *var; 347 }; 348 #define TUNABLE_QUAD(path, var) \ 349 _TUNABLE_QUAD((path), (var), __LINE__) 350 #define _TUNABLE_QUAD(path, var, line) \ 351 __TUNABLE_QUAD((path), (var), line) 352 353 #define __TUNABLE_QUAD(path, var, line) \ 354 static struct tunable_quad __tunable_quad_ ## line = { \ 355 path, \ 356 var, \ 357 }; \ 358 SYSINIT(__Tunable_init_ ## line, SI_SUB_TUNABLES, SI_ORDER_MIDDLE, \ 359 tunable_quad_init, &__tunable_quad_ ## line) 360 361 #define TUNABLE_QUAD_FETCH(path, var) getenv_quad((path), (var)) 362 363 extern void tunable_str_init(void *); 364 struct tunable_str { 365 const char *path; 366 char *var; 367 int size; 368 }; 369 #define TUNABLE_STR(path, var, size) \ 370 _TUNABLE_STR((path), (var), (size), __LINE__) 371 #define _TUNABLE_STR(path, var, size, line) \ 372 __TUNABLE_STR((path), (var), (size), line) 373 374 #define __TUNABLE_STR(path, var, size, line) \ 375 static struct tunable_str __tunable_str_ ## line = { \ 376 path, \ 377 var, \ 378 size, \ 379 }; \ 380 SYSINIT(__Tunable_init_ ## line, SI_SUB_TUNABLES, SI_ORDER_MIDDLE, \ 381 tunable_str_init, &__tunable_str_ ## line) 382 383 #define TUNABLE_STR_FETCH(path, var, size) \ 384 getenv_string((path), (var), (size)) 385 386 void net_warn_not_mpsafe(const char *component); 387 #define NET_NEEDS_GIANT(component) \ 388 SYSINIT(__net_warn_not_mpsafe_ ## __FILE__, \ 389 SI_SUB_SETTINGS, SI_ORDER_SECOND, net_warn_not_mpsafe, component); 390 391 struct intr_config_hook { 392 TAILQ_ENTRY(intr_config_hook) ich_links; 393 void (*ich_func)(void *arg); 394 void *ich_arg; 395 }; 396 397 int config_intrhook_establish(struct intr_config_hook *hook); 398 void config_intrhook_disestablish(struct intr_config_hook *hook); 399 400 #endif /* !_SYS_KERNEL_H_*/
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