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
Version:
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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: releng/11.1/sys/sys/kernel.h 316448 2017-04-03 09:36:44Z kib $ 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 char kernelname[MAXPATHLEN]; 59 60 extern int tick; /* usec per tick (1000000 / hz) */ 61 extern int hz; /* system clock's frequency */ 62 extern int psratio; /* ratio: prof / stat */ 63 extern int stathz; /* statistics clock's frequency */ 64 extern int profhz; /* profiling clock's frequency */ 65 extern int profprocs; /* number of process's profiling */ 66 extern volatile int ticks; 67 68 #endif /* _KERNEL */ 69 70 /* 71 * Enumerated types for known system startup interfaces. 72 * 73 * Startup occurs in ascending numeric order; the list entries are 74 * sorted prior to attempting startup to guarantee order. Items 75 * of the same level are arbitrated for order based on the 'order' 76 * element. 77 * 78 * These numbers are arbitrary and are chosen ONLY for ordering; the 79 * enumeration values are explicit rather than implicit to provide 80 * for binary compatibility with inserted elements. 81 * 82 * The SI_SUB_LAST value must have the highest lexical value. 83 */ 84 enum sysinit_sub_id { 85 SI_SUB_DUMMY = 0x0000000, /* not executed; for linker*/ 86 SI_SUB_DONE = 0x0000001, /* processed*/ 87 SI_SUB_TUNABLES = 0x0700000, /* establish tunable values */ 88 SI_SUB_COPYRIGHT = 0x0800001, /* first use of console*/ 89 SI_SUB_VM = 0x1000000, /* virtual memory system init*/ 90 SI_SUB_KMEM = 0x1800000, /* kernel memory*/ 91 SI_SUB_HYPERVISOR = 0x1A40000, /* 92 * Hypervisor detection and 93 * virtualization support 94 * setup. 95 */ 96 SI_SUB_WITNESS = 0x1A80000, /* witness initialization */ 97 SI_SUB_MTX_POOL_DYNAMIC = 0x1AC0000, /* dynamic mutex pool */ 98 SI_SUB_LOCK = 0x1B00000, /* various locks */ 99 SI_SUB_EVENTHANDLER = 0x1C00000, /* eventhandler init */ 100 SI_SUB_VNET_PRELINK = 0x1E00000, /* vnet init before modules */ 101 SI_SUB_KLD = 0x2000000, /* KLD and module setup */ 102 SI_SUB_CPU = 0x2100000, /* CPU resource(s)*/ 103 SI_SUB_RACCT = 0x2110000, /* resource accounting */ 104 SI_SUB_KDTRACE = 0x2140000, /* Kernel dtrace hooks */ 105 SI_SUB_RANDOM = 0x2160000, /* random number generator */ 106 SI_SUB_MAC = 0x2180000, /* TrustedBSD MAC subsystem */ 107 SI_SUB_MAC_POLICY = 0x21C0000, /* TrustedBSD MAC policies */ 108 SI_SUB_MAC_LATE = 0x21D0000, /* TrustedBSD MAC subsystem */ 109 SI_SUB_VNET = 0x21E0000, /* vnet 0 */ 110 SI_SUB_INTRINSIC = 0x2200000, /* proc 0*/ 111 SI_SUB_VM_CONF = 0x2300000, /* config VM, set limits*/ 112 SI_SUB_DDB_SERVICES = 0x2380000, /* capture, scripting, etc. */ 113 SI_SUB_RUN_QUEUE = 0x2400000, /* set up run queue*/ 114 SI_SUB_KTRACE = 0x2480000, /* ktrace */ 115 SI_SUB_OPENSOLARIS = 0x2490000, /* OpenSolaris compatibility */ 116 SI_SUB_AUDIT = 0x24C0000, /* audit */ 117 SI_SUB_CREATE_INIT = 0x2500000, /* create init process*/ 118 SI_SUB_SCHED_IDLE = 0x2600000, /* required idle procs */ 119 SI_SUB_MBUF = 0x2700000, /* mbuf subsystem */ 120 SI_SUB_INTR = 0x2800000, /* interrupt threads */ 121 #ifdef EARLY_AP_STARTUP 122 SI_SUB_SMP = 0x2900000, /* start the APs*/ 123 #endif 124 SI_SUB_SOFTINTR = 0x2A00000, /* start soft interrupt thread */ 125 SI_SUB_DEVFS = 0x2F00000, /* devfs ready for devices */ 126 SI_SUB_INIT_IF = 0x3000000, /* prep for net interfaces */ 127 SI_SUB_NETGRAPH = 0x3010000, /* Let Netgraph initialize */ 128 SI_SUB_DTRACE = 0x3020000, /* DTrace subsystem */ 129 SI_SUB_DTRACE_PROVIDER = 0x3048000, /* DTrace providers */ 130 SI_SUB_DTRACE_ANON = 0x308C000, /* DTrace anon enabling */ 131 SI_SUB_DRIVERS = 0x3100000, /* Let Drivers initialize */ 132 SI_SUB_CONFIGURE = 0x3800000, /* Configure devices */ 133 SI_SUB_VFS = 0x4000000, /* virtual filesystem*/ 134 SI_SUB_CLOCKS = 0x4800000, /* real time and stat clocks*/ 135 SI_SUB_SYSV_SHM = 0x6400000, /* System V shared memory*/ 136 SI_SUB_SYSV_SEM = 0x6800000, /* System V semaphores*/ 137 SI_SUB_SYSV_MSG = 0x6C00000, /* System V message queues*/ 138 SI_SUB_P1003_1B = 0x6E00000, /* P1003.1B realtime */ 139 SI_SUB_PSEUDO = 0x7000000, /* pseudo devices*/ 140 SI_SUB_EXEC = 0x7400000, /* execve() handlers */ 141 SI_SUB_PROTO_BEGIN = 0x8000000, /* VNET initialization */ 142 SI_SUB_PROTO_PFIL = 0x8100000, /* Initialize pfil before FWs */ 143 SI_SUB_PROTO_IF = 0x8400000, /* interfaces*/ 144 SI_SUB_PROTO_DOMAININIT = 0x8600000, /* domain registration system */ 145 SI_SUB_PROTO_MC = 0x8700000, /* Multicast */ 146 SI_SUB_PROTO_DOMAIN = 0x8800000, /* domains (address families?)*/ 147 SI_SUB_PROTO_FIREWALL = 0x8806000, /* Firewalls */ 148 SI_SUB_PROTO_IFATTACHDOMAIN = 0x8808000,/* domain dependent data init */ 149 SI_SUB_PROTO_END = 0x8ffffff, /* VNET helper functions */ 150 SI_SUB_KPROF = 0x9000000, /* kernel profiling*/ 151 SI_SUB_KICK_SCHEDULER = 0xa000000, /* start the timeout events*/ 152 SI_SUB_INT_CONFIG_HOOKS = 0xa800000, /* Interrupts enabled config */ 153 SI_SUB_ROOT_CONF = 0xb000000, /* Find root devices */ 154 SI_SUB_INTRINSIC_POST = 0xd000000, /* proc 0 cleanup*/ 155 SI_SUB_SYSCALLS = 0xd800000, /* register system calls */ 156 SI_SUB_VNET_DONE = 0xdc00000, /* vnet registration complete */ 157 SI_SUB_KTHREAD_INIT = 0xe000000, /* init process*/ 158 SI_SUB_KTHREAD_PAGE = 0xe400000, /* pageout daemon*/ 159 SI_SUB_KTHREAD_VM = 0xe800000, /* vm daemon*/ 160 SI_SUB_KTHREAD_BUF = 0xea00000, /* buffer daemon*/ 161 SI_SUB_KTHREAD_UPDATE = 0xec00000, /* update daemon*/ 162 SI_SUB_KTHREAD_IDLE = 0xee00000, /* idle procs*/ 163 #ifndef EARLY_AP_STARTUP 164 SI_SUB_SMP = 0xf000000, /* start the APs*/ 165 #endif 166 SI_SUB_RACCTD = 0xf100000, /* start racctd*/ 167 SI_SUB_LAST = 0xfffffff /* final initialization */ 168 }; 169 170 171 /* 172 * Some enumerated orders; "ANY" sorts last. 173 */ 174 enum sysinit_elem_order { 175 SI_ORDER_FIRST = 0x0000000, /* first*/ 176 SI_ORDER_SECOND = 0x0000001, /* second*/ 177 SI_ORDER_THIRD = 0x0000002, /* third*/ 178 SI_ORDER_FOURTH = 0x0000003, /* fourth*/ 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_ANY. 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 static struct tunable_int __CONCAT(__tunable_int_, __LINE__) = { \ 280 (path), \ 281 (var), \ 282 }; \ 283 SYSINIT(__CONCAT(__Tunable_init_, __LINE__), \ 284 SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_int_init, \ 285 &__CONCAT(__tunable_int_, __LINE__)) 286 287 #define TUNABLE_INT_FETCH(path, var) getenv_int((path), (var)) 288 289 /* 290 * long 291 */ 292 extern void tunable_long_init(void *); 293 struct tunable_long { 294 const char *path; 295 long *var; 296 }; 297 #define TUNABLE_LONG(path, var) \ 298 static struct tunable_long __CONCAT(__tunable_long_, __LINE__) = { \ 299 (path), \ 300 (var), \ 301 }; \ 302 SYSINIT(__CONCAT(__Tunable_init_, __LINE__), \ 303 SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_long_init,\ 304 &__CONCAT(__tunable_long_, __LINE__)) 305 306 #define TUNABLE_LONG_FETCH(path, var) getenv_long((path), (var)) 307 308 /* 309 * unsigned long 310 */ 311 extern void tunable_ulong_init(void *); 312 struct tunable_ulong { 313 const char *path; 314 unsigned long *var; 315 }; 316 #define TUNABLE_ULONG(path, var) \ 317 static struct tunable_ulong __CONCAT(__tunable_ulong_, __LINE__) = { \ 318 (path), \ 319 (var), \ 320 }; \ 321 SYSINIT(__CONCAT(__Tunable_init_, __LINE__), \ 322 SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_ulong_init, \ 323 &__CONCAT(__tunable_ulong_, __LINE__)) 324 325 #define TUNABLE_ULONG_FETCH(path, var) getenv_ulong((path), (var)) 326 327 /* 328 * int64_t 329 */ 330 extern void tunable_int64_init(void *); 331 struct tunable_int64 { 332 const char *path; 333 int64_t *var; 334 }; 335 #define TUNABLE_INT64(path, var) \ 336 static struct tunable_int64 __CONCAT(__tunable_int64_, __LINE__) = { \ 337 (path), \ 338 (var), \ 339 }; \ 340 SYSINIT(__CONCAT(__Tunable_init_, __LINE__), \ 341 SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_int64_init, \ 342 &__CONCAT(__tunable_int64_, __LINE__)) 343 344 #define TUNABLE_INT64_FETCH(path, var) getenv_int64((path), (var)) 345 346 /* 347 * uint64_t 348 */ 349 extern void tunable_uint64_init(void *); 350 struct tunable_uint64 { 351 const char *path; 352 uint64_t *var; 353 }; 354 #define TUNABLE_UINT64(path, var) \ 355 static struct tunable_uint64 __CONCAT(__tunable_uint64_, __LINE__) = { \ 356 (path), \ 357 (var), \ 358 }; \ 359 SYSINIT(__CONCAT(__Tunable_init_, __LINE__), \ 360 SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_uint64_init, \ 361 &__CONCAT(__tunable_uint64_, __LINE__)) 362 363 #define TUNABLE_UINT64_FETCH(path, var) getenv_uint64((path), (var)) 364 365 /* 366 * quad 367 */ 368 extern void tunable_quad_init(void *); 369 struct tunable_quad { 370 const char *path; 371 quad_t *var; 372 }; 373 #define TUNABLE_QUAD(path, var) \ 374 static struct tunable_quad __CONCAT(__tunable_quad_, __LINE__) = { \ 375 (path), \ 376 (var), \ 377 }; \ 378 SYSINIT(__CONCAT(__Tunable_init_, __LINE__), \ 379 SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_quad_init, \ 380 &__CONCAT(__tunable_quad_, __LINE__)) 381 382 #define TUNABLE_QUAD_FETCH(path, var) getenv_quad((path), (var)) 383 384 extern void tunable_str_init(void *); 385 struct tunable_str { 386 const char *path; 387 char *var; 388 int size; 389 }; 390 #define TUNABLE_STR(path, var, size) \ 391 static struct tunable_str __CONCAT(__tunable_str_, __LINE__) = { \ 392 (path), \ 393 (var), \ 394 (size), \ 395 }; \ 396 SYSINIT(__CONCAT(__Tunable_init_, __LINE__), \ 397 SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_str_init, \ 398 &__CONCAT(__tunable_str_, __LINE__)) 399 400 #define TUNABLE_STR_FETCH(path, var, size) \ 401 getenv_string((path), (var), (size)) 402 403 struct intr_config_hook { 404 TAILQ_ENTRY(intr_config_hook) ich_links; 405 void (*ich_func)(void *arg); 406 void *ich_arg; 407 }; 408 409 int config_intrhook_establish(struct intr_config_hook *hook); 410 void config_intrhook_disestablish(struct intr_config_hook *hook); 411 412 #endif /* !_SYS_KERNEL_H_*/
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