Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/sys/systm.h
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1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1988, 1991, 1993 5 * The Regents of the University of California. 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. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)systm.h 8.7 (Berkeley) 3/29/95 37 * $FreeBSD$ 38 */ 39 40 #ifndef _SYS_SYSTM_H_ 41 #define _SYS_SYSTM_H_ 42 43 #include <sys/cdefs.h> 44 #include <machine/atomic.h> 45 #include <machine/cpufunc.h> 46 #include <sys/callout.h> 47 #include <sys/kassert.h> 48 #include <sys/queue.h> 49 #include <sys/stdint.h> /* for people using printf mainly */ 50 51 __NULLABILITY_PRAGMA_PUSH 52 53 #ifdef _KERNEL 54 extern int cold; /* nonzero if we are doing a cold boot */ 55 extern int suspend_blocked; /* block suspend due to pending shutdown */ 56 extern int rebooting; /* kern_reboot() has been called. */ 57 extern char version[]; /* system version */ 58 extern char compiler_version[]; /* compiler version */ 59 extern char copyright[]; /* system copyright */ 60 extern int kstack_pages; /* number of kernel stack pages */ 61 62 extern u_long pagesizes[]; /* supported page sizes */ 63 extern long physmem; /* physical memory */ 64 extern long realmem; /* 'real' memory */ 65 66 extern char *rootdevnames[2]; /* names of possible root devices */ 67 68 extern int boothowto; /* reboot flags, from console subsystem */ 69 extern int bootverbose; /* nonzero to print verbose messages */ 70 71 extern int maxusers; /* system tune hint */ 72 extern int ngroups_max; /* max # of supplemental groups */ 73 extern int vm_guest; /* Running as virtual machine guest? */ 74 75 extern u_long maxphys; /* max raw I/O transfer size */ 76 77 /* 78 * Detected virtual machine guest types. The intention is to expand 79 * and/or add to the VM_GUEST_VM type if specific VM functionality is 80 * ever implemented (e.g. vendor-specific paravirtualization features). 81 * Keep in sync with vm_guest_sysctl_names[]. 82 */ 83 enum VM_GUEST { VM_GUEST_NO = 0, VM_GUEST_VM, VM_GUEST_XEN, VM_GUEST_HV, 84 VM_GUEST_VMWARE, VM_GUEST_KVM, VM_GUEST_BHYVE, VM_GUEST_VBOX, 85 VM_GUEST_PARALLELS, VM_LAST }; 86 87 #endif /* KERNEL */ 88 89 /* 90 * Align variables. 91 */ 92 #define __read_mostly __section(".data.read_mostly") 93 #define __read_frequently __section(".data.read_frequently") 94 #define __exclusive_cache_line __aligned(CACHE_LINE_SIZE) \ 95 __section(".data.exclusive_cache_line") 96 #if defined(_STANDALONE) 97 struct ucred; 98 #endif 99 100 #ifdef _KERNEL 101 #include <sys/param.h> /* MAXCPU */ 102 #include <sys/pcpu.h> /* curthread */ 103 #include <sys/kpilite.h> 104 105 extern int osreldate; 106 107 extern const void *zero_region; /* address space maps to a zeroed page */ 108 109 extern int unmapped_buf_allowed; 110 111 #ifdef __LP64__ 112 #define IOSIZE_MAX iosize_max() 113 #define DEVFS_IOSIZE_MAX devfs_iosize_max() 114 #else 115 #define IOSIZE_MAX SSIZE_MAX 116 #define DEVFS_IOSIZE_MAX SSIZE_MAX 117 #endif 118 119 /* 120 * General function declarations. 121 */ 122 123 struct inpcb; 124 struct lock_object; 125 struct malloc_type; 126 struct mtx; 127 struct proc; 128 struct socket; 129 struct thread; 130 struct tty; 131 struct ucred; 132 struct uio; 133 struct _jmp_buf; 134 struct trapframe; 135 struct eventtimer; 136 137 int setjmp(struct _jmp_buf *) __returns_twice; 138 void longjmp(struct _jmp_buf *, int) __dead2; 139 int dumpstatus(vm_offset_t addr, off_t count); 140 int nullop(void); 141 int eopnotsupp(void); 142 int ureadc(int, struct uio *); 143 void hashdestroy(void *, struct malloc_type *, u_long); 144 void *hashinit(int count, struct malloc_type *type, u_long *hashmask); 145 void *hashinit_flags(int count, struct malloc_type *type, 146 u_long *hashmask, int flags); 147 #define HASH_NOWAIT 0x00000001 148 #define HASH_WAITOK 0x00000002 149 150 void *phashinit(int count, struct malloc_type *type, u_long *nentries); 151 void *phashinit_flags(int count, struct malloc_type *type, u_long *nentries, 152 int flags); 153 154 void cpu_flush_dcache(void *, size_t); 155 void cpu_rootconf(void); 156 void critical_enter_KBI(void); 157 void critical_exit_KBI(void); 158 void critical_exit_preempt(void); 159 void init_param1(void); 160 void init_param2(long physpages); 161 void init_static_kenv(char *, size_t); 162 void tablefull(const char *); 163 164 /* 165 * Allocate per-thread "current" state in the linuxkpi 166 */ 167 extern int (*lkpi_alloc_current)(struct thread *, int); 168 int linux_alloc_current_noop(struct thread *, int); 169 170 #if (defined(KLD_MODULE) && !defined(KLD_TIED)) || defined(KTR_CRITICAL) || !defined(_KERNEL) || defined(GENOFFSET) 171 #define critical_enter() critical_enter_KBI() 172 #define critical_exit() critical_exit_KBI() 173 #else 174 static __inline void 175 critical_enter(void) 176 { 177 struct thread_lite *td; 178 179 td = (struct thread_lite *)curthread; 180 td->td_critnest++; 181 atomic_interrupt_fence(); 182 } 183 184 static __inline void 185 critical_exit(void) 186 { 187 struct thread_lite *td; 188 189 td = (struct thread_lite *)curthread; 190 KASSERT(td->td_critnest != 0, 191 ("critical_exit: td_critnest == 0")); 192 atomic_interrupt_fence(); 193 td->td_critnest--; 194 atomic_interrupt_fence(); 195 if (__predict_false(td->td_owepreempt)) 196 critical_exit_preempt(); 197 198 } 199 #endif 200 201 #ifdef EARLY_PRINTF 202 typedef void early_putc_t(int ch); 203 extern early_putc_t *early_putc; 204 #endif 205 int kvprintf(char const *, void (*)(int, void*), void *, int, 206 __va_list) __printflike(1, 0); 207 void log(int, const char *, ...) __printflike(2, 3); 208 void log_console(struct uio *); 209 void vlog(int, const char *, __va_list) __printflike(2, 0); 210 int asprintf(char **ret, struct malloc_type *mtp, const char *format, 211 ...) __printflike(3, 4); 212 int printf(const char *, ...) __printflike(1, 2); 213 int snprintf(char *, size_t, const char *, ...) __printflike(3, 4); 214 int sprintf(char *buf, const char *, ...) __printflike(2, 3); 215 int uprintf(const char *, ...) __printflike(1, 2); 216 int vprintf(const char *, __va_list) __printflike(1, 0); 217 int vasprintf(char **ret, struct malloc_type *mtp, const char *format, 218 __va_list ap) __printflike(3, 0); 219 int vsnprintf(char *, size_t, const char *, __va_list) __printflike(3, 0); 220 int vsnrprintf(char *, size_t, int, const char *, __va_list) __printflike(4, 0); 221 int vsprintf(char *buf, const char *, __va_list) __printflike(2, 0); 222 int sscanf(const char *, char const * _Nonnull, ...) __scanflike(2, 3); 223 int vsscanf(const char * _Nonnull, char const * _Nonnull, __va_list) __scanflike(2, 0); 224 long strtol(const char *, char **, int); 225 u_long strtoul(const char *, char **, int); 226 quad_t strtoq(const char *, char **, int); 227 u_quad_t strtouq(const char *, char **, int); 228 void tprintf(struct proc *p, int pri, const char *, ...) __printflike(3, 4); 229 void vtprintf(struct proc *, int, const char *, __va_list) __printflike(3, 0); 230 void hexdump(const void *ptr, int length, const char *hdr, int flags); 231 #define HD_COLUMN_MASK 0xff 232 #define HD_DELIM_MASK 0xff00 233 #define HD_OMIT_COUNT (1 << 16) 234 #define HD_OMIT_HEX (1 << 17) 235 #define HD_OMIT_CHARS (1 << 18) 236 237 #define ovbcopy(f, t, l) bcopy((f), (t), (l)) 238 void explicit_bzero(void * _Nonnull, size_t); 239 240 void *memset(void * _Nonnull buf, int c, size_t len); 241 void *memcpy(void * _Nonnull to, const void * _Nonnull from, size_t len); 242 void *memmove(void * _Nonnull dest, const void * _Nonnull src, size_t n); 243 int memcmp(const void *b1, const void *b2, size_t len); 244 245 #ifdef SAN_NEEDS_INTERCEPTORS 246 #define SAN_INTERCEPTOR(func) \ 247 __CONCAT(SAN_INTERCEPTOR_PREFIX, __CONCAT(_, func)) 248 void *SAN_INTERCEPTOR(memset)(void *, int, size_t); 249 void *SAN_INTERCEPTOR(memcpy)(void *, const void *, size_t); 250 void *SAN_INTERCEPTOR(memmove)(void *, const void *, size_t); 251 int SAN_INTERCEPTOR(memcmp)(const void *, const void *, size_t); 252 #ifndef SAN_RUNTIME 253 #define bcopy(from, to, len) SAN_INTERCEPTOR(memmove)((to), (from), (len)) 254 #define bzero(buf, len) SAN_INTERCEPTOR(memset)((buf), 0, (len)) 255 #define bcmp(b1, b2, len) SAN_INTERCEPTOR(memcmp)((b1), (b2), (len)) 256 #define memset(buf, c, len) SAN_INTERCEPTOR(memset)((buf), (c), (len)) 257 #define memcpy(to, from, len) SAN_INTERCEPTOR(memcpy)((to), (from), (len)) 258 #define memmove(dest, src, n) SAN_INTERCEPTOR(memmove)((dest), (src), (n)) 259 #define memcmp(b1, b2, len) SAN_INTERCEPTOR(memcmp)((b1), (b2), (len)) 260 #endif /* !SAN_RUNTIME */ 261 #else /* !SAN_NEEDS_INTERCEPTORS */ 262 #define bcopy(from, to, len) __builtin_memmove((to), (from), (len)) 263 #define bzero(buf, len) __builtin_memset((buf), 0, (len)) 264 #define bcmp(b1, b2, len) __builtin_memcmp((b1), (b2), (len)) 265 #define memset(buf, c, len) __builtin_memset((buf), (c), (len)) 266 #define memcpy(to, from, len) __builtin_memcpy((to), (from), (len)) 267 #define memmove(dest, src, n) __builtin_memmove((dest), (src), (n)) 268 #define memcmp(b1, b2, len) __builtin_memcmp((b1), (b2), (len)) 269 #endif /* SAN_NEEDS_INTERCEPTORS */ 270 271 void *memset_early(void * _Nonnull buf, int c, size_t len); 272 #define bzero_early(buf, len) memset_early((buf), 0, (len)) 273 void *memcpy_early(void * _Nonnull to, const void * _Nonnull from, size_t len); 274 void *memmove_early(void * _Nonnull dest, const void * _Nonnull src, size_t n); 275 #define bcopy_early(from, to, len) memmove_early((to), (from), (len)) 276 277 #define copystr(src, dst, len, outlen) ({ \ 278 size_t __r, __len, *__outlen; \ 279 \ 280 __len = (len); \ 281 __outlen = (outlen); \ 282 __r = strlcpy((dst), (src), __len); \ 283 if (__outlen != NULL) \ 284 *__outlen = ((__r >= __len) ? __len : __r + 1); \ 285 ((__r >= __len) ? ENAMETOOLONG : 0); \ 286 }) 287 288 int copyinstr(const void * __restrict udaddr, 289 void * _Nonnull __restrict kaddr, size_t len, 290 size_t * __restrict lencopied); 291 int copyin(const void * __restrict udaddr, 292 void * _Nonnull __restrict kaddr, size_t len); 293 int copyin_nofault(const void * __restrict udaddr, 294 void * _Nonnull __restrict kaddr, size_t len); 295 int copyout(const void * _Nonnull __restrict kaddr, 296 void * __restrict udaddr, size_t len); 297 int copyout_nofault(const void * _Nonnull __restrict kaddr, 298 void * __restrict udaddr, size_t len); 299 300 #ifdef SAN_NEEDS_INTERCEPTORS 301 int SAN_INTERCEPTOR(copyin)(const void *, void *, size_t); 302 int SAN_INTERCEPTOR(copyinstr)(const void *, void *, size_t, size_t *); 303 int SAN_INTERCEPTOR(copyout)(const void *, void *, size_t); 304 #ifndef SAN_RUNTIME 305 #define copyin(u, k, l) SAN_INTERCEPTOR(copyin)((u), (k), (l)) 306 #define copyinstr(u, k, l, lc) SAN_INTERCEPTOR(copyinstr)((u), (k), (l), (lc)) 307 #define copyout(k, u, l) SAN_INTERCEPTOR(copyout)((k), (u), (l)) 308 #endif /* !SAN_RUNTIME */ 309 #endif /* SAN_NEEDS_INTERCEPTORS */ 310 311 int fubyte(volatile const void *base); 312 long fuword(volatile const void *base); 313 int fuword16(volatile const void *base); 314 int32_t fuword32(volatile const void *base); 315 int64_t fuword64(volatile const void *base); 316 int fueword(volatile const void *base, long *val); 317 int fueword32(volatile const void *base, int32_t *val); 318 int fueword64(volatile const void *base, int64_t *val); 319 int subyte(volatile void *base, int byte); 320 int suword(volatile void *base, long word); 321 int suword16(volatile void *base, int word); 322 int suword32(volatile void *base, int32_t word); 323 int suword64(volatile void *base, int64_t word); 324 uint32_t casuword32(volatile uint32_t *base, uint32_t oldval, uint32_t newval); 325 u_long casuword(volatile u_long *p, u_long oldval, u_long newval); 326 int casueword32(volatile uint32_t *base, uint32_t oldval, uint32_t *oldvalp, 327 uint32_t newval); 328 int casueword(volatile u_long *p, u_long oldval, u_long *oldvalp, 329 u_long newval); 330 331 #if defined(SAN_NEEDS_INTERCEPTORS) && !defined(KCSAN) 332 int SAN_INTERCEPTOR(fubyte)(volatile const void *base); 333 int SAN_INTERCEPTOR(fuword16)(volatile const void *base); 334 int SAN_INTERCEPTOR(fueword)(volatile const void *base, long *val); 335 int SAN_INTERCEPTOR(fueword32)(volatile const void *base, int32_t *val); 336 int SAN_INTERCEPTOR(fueword64)(volatile const void *base, int64_t *val); 337 int SAN_INTERCEPTOR(subyte)(volatile void *base, int byte); 338 int SAN_INTERCEPTOR(suword)(volatile void *base, long word); 339 int SAN_INTERCEPTOR(suword16)(volatile void *base, int word); 340 int SAN_INTERCEPTOR(suword32)(volatile void *base, int32_t word); 341 int SAN_INTERCEPTOR(suword64)(volatile void *base, int64_t word); 342 int SAN_INTERCEPTOR(casueword32)(volatile uint32_t *base, uint32_t oldval, 343 uint32_t *oldvalp, uint32_t newval); 344 int SAN_INTERCEPTOR(casueword)(volatile u_long *p, u_long oldval, 345 u_long *oldvalp, u_long newval); 346 #ifndef SAN_RUNTIME 347 #define fubyte(b) SAN_INTERCEPTOR(fubyte)((b)) 348 #define fuword16(b) SAN_INTERCEPTOR(fuword16)((b)) 349 #define fueword(b, v) SAN_INTERCEPTOR(fueword)((b), (v)) 350 #define fueword32(b, v) SAN_INTERCEPTOR(fueword32)((b), (v)) 351 #define fueword64(b, v) SAN_INTERCEPTOR(fueword64)((b), (v)) 352 #define subyte(b, w) SAN_INTERCEPTOR(subyte)((b), (w)) 353 #define suword(b, w) SAN_INTERCEPTOR(suword)((b), (w)) 354 #define suword16(b, w) SAN_INTERCEPTOR(suword16)((b), (w)) 355 #define suword32(b, w) SAN_INTERCEPTOR(suword32)((b), (w)) 356 #define suword64(b, w) SAN_INTERCEPTOR(suword64)((b), (w)) 357 #define casueword32(b, o, p, n) SAN_INTERCEPTOR(casueword32)((b), (o), (p), (n)) 358 #define casueword(b, o, p, n) SAN_INTERCEPTOR(casueword)((b), (o), (p), (n)) 359 #endif /* !SAN_RUNTIME */ 360 #endif /* SAN_NEEDS_INTERCEPTORS && !KCSAN */ 361 362 int sysbeep(int hertz, sbintime_t duration); 363 364 void hardclock(int cnt, int usermode); 365 void hardclock_sync(int cpu); 366 void statclock(int cnt, int usermode); 367 void profclock(int cnt, int usermode, uintfptr_t pc); 368 369 int hardclockintr(void); 370 371 void startprofclock(struct proc *); 372 void stopprofclock(struct proc *); 373 void cpu_startprofclock(void); 374 void cpu_stopprofclock(void); 375 void suspendclock(void); 376 void resumeclock(void); 377 sbintime_t cpu_idleclock(void); 378 void cpu_activeclock(void); 379 void cpu_new_callout(int cpu, sbintime_t bt, sbintime_t bt_opt); 380 void cpu_et_frequency(struct eventtimer *et, uint64_t newfreq); 381 extern int cpu_disable_c2_sleep; 382 extern int cpu_disable_c3_sleep; 383 384 char *kern_getenv(const char *name); 385 void freeenv(char *env); 386 int getenv_int(const char *name, int *data); 387 int getenv_uint(const char *name, unsigned int *data); 388 int getenv_long(const char *name, long *data); 389 int getenv_ulong(const char *name, unsigned long *data); 390 int getenv_string(const char *name, char *data, int size); 391 int getenv_int64(const char *name, int64_t *data); 392 int getenv_uint64(const char *name, uint64_t *data); 393 int getenv_quad(const char *name, quad_t *data); 394 int getenv_bool(const char *name, bool *data); 395 bool getenv_is_true(const char *name); 396 bool getenv_is_false(const char *name); 397 int kern_setenv(const char *name, const char *value); 398 int kern_unsetenv(const char *name); 399 int testenv(const char *name); 400 401 int getenv_array(const char *name, void *data, int size, int *psize, 402 int type_size, bool allow_signed); 403 #define GETENV_UNSIGNED false /* negative numbers not allowed */ 404 #define GETENV_SIGNED true /* negative numbers allowed */ 405 406 typedef uint64_t (cpu_tick_f)(void); 407 void set_cputicker(cpu_tick_f *func, uint64_t freq, bool isvariable); 408 extern cpu_tick_f *cpu_ticks; 409 uint64_t cpu_tickrate(void); 410 uint64_t cputick2usec(uint64_t tick); 411 412 #include <sys/libkern.h> 413 414 /* Initialize the world */ 415 void consinit(void); 416 void cpu_initclocks(void); 417 void cpu_initclocks_bsp(void); 418 void cpu_initclocks_ap(void); 419 void usrinfoinit(void); 420 421 /* Finalize the world */ 422 void kern_reboot(int) __dead2; 423 void shutdown_nice(int); 424 425 /* Stubs for obsolete functions that used to be for interrupt management */ 426 static __inline intrmask_t splhigh(void) { return 0; } 427 static __inline intrmask_t splimp(void) { return 0; } 428 static __inline intrmask_t splnet(void) { return 0; } 429 static __inline intrmask_t spltty(void) { return 0; } 430 static __inline void splx(intrmask_t ipl __unused) { return; } 431 432 /* 433 * Common `proc' functions are declared here so that proc.h can be included 434 * less often. 435 */ 436 int _sleep(const void * _Nonnull chan, struct lock_object *lock, int pri, 437 const char *wmesg, sbintime_t sbt, sbintime_t pr, int flags); 438 #define msleep(chan, mtx, pri, wmesg, timo) \ 439 _sleep((chan), &(mtx)->lock_object, (pri), (wmesg), \ 440 tick_sbt * (timo), 0, C_HARDCLOCK) 441 #define msleep_sbt(chan, mtx, pri, wmesg, bt, pr, flags) \ 442 _sleep((chan), &(mtx)->lock_object, (pri), (wmesg), (bt), (pr), \ 443 (flags)) 444 int msleep_spin_sbt(const void * _Nonnull chan, struct mtx *mtx, 445 const char *wmesg, sbintime_t sbt, sbintime_t pr, int flags); 446 #define msleep_spin(chan, mtx, wmesg, timo) \ 447 msleep_spin_sbt((chan), (mtx), (wmesg), tick_sbt * (timo), \ 448 0, C_HARDCLOCK) 449 int pause_sbt(const char *wmesg, sbintime_t sbt, sbintime_t pr, 450 int flags); 451 static __inline int 452 pause(const char *wmesg, int timo) 453 { 454 return (pause_sbt(wmesg, tick_sbt * timo, 0, C_HARDCLOCK)); 455 } 456 #define pause_sig(wmesg, timo) \ 457 pause_sbt((wmesg), tick_sbt * (timo), 0, C_HARDCLOCK | C_CATCH) 458 #define tsleep(chan, pri, wmesg, timo) \ 459 _sleep((chan), NULL, (pri), (wmesg), tick_sbt * (timo), \ 460 0, C_HARDCLOCK) 461 #define tsleep_sbt(chan, pri, wmesg, bt, pr, flags) \ 462 _sleep((chan), NULL, (pri), (wmesg), (bt), (pr), (flags)) 463 void wakeup(const void *chan); 464 void wakeup_one(const void *chan); 465 void wakeup_any(const void *chan); 466 467 /* 468 * Common `struct cdev *' stuff are declared here to avoid #include poisoning 469 */ 470 471 struct cdev; 472 dev_t dev2udev(struct cdev *x); 473 const char *devtoname(struct cdev *cdev); 474 475 #ifdef __LP64__ 476 size_t devfs_iosize_max(void); 477 size_t iosize_max(void); 478 #endif 479 480 int poll_no_poll(int events); 481 482 /* XXX: Should be void nanodelay(u_int nsec); */ 483 void DELAY(int usec); 484 485 /* Root mount holdback API */ 486 struct root_hold_token { 487 int flags; 488 const char *who; 489 TAILQ_ENTRY(root_hold_token) list; 490 }; 491 492 struct root_hold_token *root_mount_hold(const char *identifier); 493 void root_mount_hold_token(const char *identifier, struct root_hold_token *h); 494 void root_mount_rel(struct root_hold_token *h); 495 int root_mounted(void); 496 497 /* 498 * Unit number allocation API. (kern/subr_unit.c) 499 */ 500 struct unrhdr; 501 #define UNR_NO_MTX ((void *)(uintptr_t)-1) 502 struct unrhdr *new_unrhdr(int low, int high, struct mtx *mutex); 503 void init_unrhdr(struct unrhdr *uh, int low, int high, struct mtx *mutex); 504 void delete_unrhdr(struct unrhdr *uh); 505 void clear_unrhdr(struct unrhdr *uh); 506 void clean_unrhdr(struct unrhdr *uh); 507 void clean_unrhdrl(struct unrhdr *uh); 508 int alloc_unr(struct unrhdr *uh); 509 int alloc_unr_specific(struct unrhdr *uh, u_int item); 510 int alloc_unrl(struct unrhdr *uh); 511 void free_unr(struct unrhdr *uh, u_int item); 512 513 struct unrhdr64 { 514 uint64_t counter; 515 }; 516 517 static __inline void 518 new_unrhdr64(struct unrhdr64 *unr64, uint64_t low) 519 { 520 521 unr64->counter = low; 522 } 523 524 static __inline uint64_t 525 alloc_unr64(struct unrhdr64 *unr64) 526 { 527 528 return (atomic_fetchadd_64(&unr64->counter, 1)); 529 } 530 531 void intr_prof_stack_use(struct thread *td, struct trapframe *frame); 532 533 void counted_warning(unsigned *counter, const char *msg); 534 535 /* 536 * APIs to manage deprecation and obsolescence. 537 */ 538 void _gone_in(int major, const char *msg); 539 void _gone_in_dev(device_t dev, int major, const char *msg); 540 #ifdef NO_OBSOLETE_CODE 541 #define __gone_ok(m, msg) \ 542 _Static_assert(m < P_OSREL_MAJOR(__FreeBSD_version)), \ 543 "Obsolete code: " msg); 544 #else 545 #define __gone_ok(m, msg) 546 #endif 547 #define gone_in(major, msg) __gone_ok(major, msg) _gone_in(major, msg) 548 #define gone_in_dev(dev, major, msg) __gone_ok(major, msg) _gone_in_dev(dev, major, msg) 549 550 #ifdef INVARIANTS 551 #define __diagused 552 #else 553 #define __diagused __unused 554 #endif 555 556 #ifdef WITNESS 557 #define __witness_used 558 #else 559 #define __witness_used __unused 560 #endif 561 562 #endif /* _KERNEL */ 563 564 __NULLABILITY_PRAGMA_POP 565 #endif /* !_SYS_SYSTM_H_ */
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