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 */
38
39 #ifndef _SYS_SYSTM_H_
40 #define _SYS_SYSTM_H_
41
42 #include <sys/types.h>
43 #include <sys/callout.h>
44 #include <sys/kassert.h>
45 #include <sys/queue.h>
46 #include <sys/stdint.h> /* for people using printf mainly */
47 #include <machine/atomic.h>
48 #include <machine/cpufunc.h>
49
50 __NULLABILITY_PRAGMA_PUSH
51
52 #ifdef _KERNEL
53 extern int cold; /* nonzero if we are doing a cold boot */
54 extern int suspend_blocked; /* block suspend due to pending shutdown */
55 extern int rebooting; /* kern_reboot() has been called. */
56 extern const char version[]; /* system version */
57 extern const char compiler_version[]; /* compiler version */
58 extern const char copyright[]; /* system copyright */
59 extern int kstack_pages; /* number of kernel stack pages */
60
61 extern u_long pagesizes[]; /* supported page sizes */
62 extern long physmem; /* physical memory */
63 extern long realmem; /* 'real' memory */
64
65 extern char *rootdevnames[2]; /* names of possible root devices */
66
67 extern int boothowto; /* reboot flags, from console subsystem */
68 extern int bootverbose; /* nonzero to print verbose messages */
69
70 extern int maxusers; /* system tune hint */
71 extern int ngroups_max; /* max # of supplemental groups */
72 extern int vm_guest; /* Running as virtual machine guest? */
73
74 extern u_long maxphys; /* max raw I/O transfer size */
75
76 /*
77 * Detected virtual machine guest types. The intention is to expand
78 * and/or add to the VM_GUEST_VM type if specific VM functionality is
79 * ever implemented (e.g. vendor-specific paravirtualization features).
80 * Keep in sync with vm_guest_sysctl_names[].
81 */
82 enum VM_GUEST { VM_GUEST_NO = 0, VM_GUEST_VM, VM_GUEST_XEN, VM_GUEST_HV,
83 VM_GUEST_VMWARE, VM_GUEST_KVM, VM_GUEST_BHYVE, VM_GUEST_VBOX,
84 VM_GUEST_PARALLELS, VM_GUEST_NVMM, VM_LAST };
85
86 #endif /* KERNEL */
87
88 /*
89 * Align variables.
90 */
91 #define __read_mostly __section(".data.read_mostly")
92 #define __read_frequently __section(".data.read_frequently")
93 #define __exclusive_cache_line __aligned(CACHE_LINE_SIZE) \
94 __section(".data.exclusive_cache_line")
95 #if defined(_STANDALONE)
96 struct ucred;
97 #endif
98
99 #ifdef _KERNEL
100 #include <sys/param.h> /* MAXCPU */
101 #include <sys/pcpu.h> /* curthread */
102 #include <sys/kpilite.h>
103
104 /*
105 * If we have already panic'd and this is the thread that called
106 * panic(), then don't block on any mutexes but silently succeed.
107 * Otherwise, the kernel will deadlock since the scheduler isn't
108 * going to run the thread that holds any lock we need.
109 */
110 #define SCHEDULER_STOPPED_TD(td) ({ \
111 MPASS((td) == curthread); \
112 __predict_false((td)->td_stopsched); \
113 })
114 #define SCHEDULER_STOPPED() SCHEDULER_STOPPED_TD(curthread)
115
116 extern const int osreldate;
117
118 extern const void *zero_region; /* address space maps to a zeroed page */
119
120 extern int unmapped_buf_allowed;
121
122 #ifdef __LP64__
123 #define IOSIZE_MAX iosize_max()
124 #define DEVFS_IOSIZE_MAX devfs_iosize_max()
125 #else
126 #define IOSIZE_MAX SSIZE_MAX
127 #define DEVFS_IOSIZE_MAX SSIZE_MAX
128 #endif
129
130 /*
131 * General function declarations.
132 */
133
134 struct inpcb;
135 struct lock_object;
136 struct malloc_type;
137 struct mtx;
138 struct proc;
139 struct socket;
140 struct thread;
141 struct tty;
142 struct ucred;
143 struct uio;
144 struct _jmp_buf;
145 struct trapframe;
146 struct eventtimer;
147
148 int setjmp(struct _jmp_buf *) __returns_twice;
149 void longjmp(struct _jmp_buf *, int) __dead2;
150 int dumpstatus(vm_offset_t addr, off_t count);
151 int nullop(void);
152 int eopnotsupp(void);
153 int ureadc(int, struct uio *);
154 void hashdestroy(void *, struct malloc_type *, u_long);
155 void *hashinit(int count, struct malloc_type *type, u_long *hashmask);
156 void *hashinit_flags(int count, struct malloc_type *type,
157 u_long *hashmask, int flags);
158 #define HASH_NOWAIT 0x00000001
159 #define HASH_WAITOK 0x00000002
160
161 void *phashinit(int count, struct malloc_type *type, u_long *nentries);
162 void *phashinit_flags(int count, struct malloc_type *type, u_long *nentries,
163 int flags);
164
165 void cpu_flush_dcache(void *, size_t);
166 void cpu_rootconf(void);
167 void critical_enter_KBI(void);
168 void critical_exit_KBI(void);
169 void critical_exit_preempt(void);
170 void init_param1(void);
171 void init_param2(long physpages);
172 void init_static_kenv(char *, size_t);
173 void tablefull(const char *);
174
175 /*
176 * Allocate per-thread "current" state in the linuxkpi
177 */
178 extern int (*lkpi_alloc_current)(struct thread *, int);
179 int linux_alloc_current_noop(struct thread *, int);
180
181 #if (defined(KLD_MODULE) && !defined(KLD_TIED)) || defined(KTR_CRITICAL) || !defined(_KERNEL) || defined(GENOFFSET)
182 #define critical_enter() critical_enter_KBI()
183 #define critical_exit() critical_exit_KBI()
184 #else
185 static __inline void
critical_enter(void)186 critical_enter(void)
187 {
188 struct thread_lite *td;
189
190 td = (struct thread_lite *)curthread;
191 td->td_critnest++;
192 atomic_interrupt_fence();
193 }
194
195 static __inline void
critical_exit(void)196 critical_exit(void)
197 {
198 struct thread_lite *td;
199
200 td = (struct thread_lite *)curthread;
201 KASSERT(td->td_critnest != 0,
202 ("critical_exit: td_critnest == 0"));
203 atomic_interrupt_fence();
204 td->td_critnest--;
205 atomic_interrupt_fence();
206 if (__predict_false(td->td_owepreempt))
207 critical_exit_preempt();
208
209 }
210 #endif
211
212 #ifdef EARLY_PRINTF
213 typedef void early_putc_t(int ch);
214 extern early_putc_t *early_putc;
215 #endif
216 int kvprintf(char const *, void (*)(int, void*), void *, int,
217 __va_list) __printflike(1, 0);
218 void log(int, const char *, ...) __printflike(2, 3);
219 void log_console(struct uio *);
220 void vlog(int, const char *, __va_list) __printflike(2, 0);
221 int asprintf(char **ret, struct malloc_type *mtp, const char *format,
222 ...) __printflike(3, 4);
223 int printf(const char *, ...) __printflike(1, 2);
224 int snprintf(char *, size_t, const char *, ...) __printflike(3, 4);
225 int sprintf(char *buf, const char *, ...) __printflike(2, 3);
226 int uprintf(const char *, ...) __printflike(1, 2);
227 int vprintf(const char *, __va_list) __printflike(1, 0);
228 int vasprintf(char **ret, struct malloc_type *mtp, const char *format,
229 __va_list ap) __printflike(3, 0);
230 int vsnprintf(char *, size_t, const char *, __va_list) __printflike(3, 0);
231 int vsnrprintf(char *, size_t, int, const char *, __va_list) __printflike(4, 0);
232 int vsprintf(char *buf, const char *, __va_list) __printflike(2, 0);
233 int sscanf(const char *, char const * _Nonnull, ...) __scanflike(2, 3);
234 int vsscanf(const char * _Nonnull, char const * _Nonnull, __va_list) __scanflike(2, 0);
235 long strtol(const char *, char **, int);
236 u_long strtoul(const char *, char **, int);
237 quad_t strtoq(const char *, char **, int);
238 u_quad_t strtouq(const char *, char **, int);
239 void tprintf(struct proc *p, int pri, const char *, ...) __printflike(3, 4);
240 void vtprintf(struct proc *, int, const char *, __va_list) __printflike(3, 0);
241 void hexdump(const void *ptr, int length, const char *hdr, int flags);
242 #define HD_COLUMN_MASK 0xff
243 #define HD_DELIM_MASK 0xff00
244 #define HD_OMIT_COUNT (1 << 16)
245 #define HD_OMIT_HEX (1 << 17)
246 #define HD_OMIT_CHARS (1 << 18)
247
248 #define ovbcopy(f, t, l) bcopy((f), (t), (l))
249 void explicit_bzero(void * _Nonnull, size_t);
250
251 void *memset(void * _Nonnull buf, int c, size_t len);
252 void *memcpy(void * _Nonnull to, const void * _Nonnull from, size_t len);
253 void *memmove(void * _Nonnull dest, const void * _Nonnull src, size_t n);
254 int memcmp(const void *b1, const void *b2, size_t len);
255
256 #ifdef SAN_NEEDS_INTERCEPTORS
257 #define SAN_INTERCEPTOR(func) \
258 __CONCAT(SAN_INTERCEPTOR_PREFIX, __CONCAT(_, func))
259 void *SAN_INTERCEPTOR(memset)(void *, int, size_t);
260 void *SAN_INTERCEPTOR(memcpy)(void *, const void *, size_t);
261 void *SAN_INTERCEPTOR(memmove)(void *, const void *, size_t);
262 int SAN_INTERCEPTOR(memcmp)(const void *, const void *, size_t);
263 #ifndef SAN_RUNTIME
264 #define bcopy(from, to, len) SAN_INTERCEPTOR(memmove)((to), (from), (len))
265 #define bzero(buf, len) SAN_INTERCEPTOR(memset)((buf), 0, (len))
266 #define bcmp(b1, b2, len) SAN_INTERCEPTOR(memcmp)((b1), (b2), (len))
267 #define memset(buf, c, len) SAN_INTERCEPTOR(memset)((buf), (c), (len))
268 #define memcpy(to, from, len) SAN_INTERCEPTOR(memcpy)((to), (from), (len))
269 #define memmove(dest, src, n) SAN_INTERCEPTOR(memmove)((dest), (src), (n))
270 #define memcmp(b1, b2, len) SAN_INTERCEPTOR(memcmp)((b1), (b2), (len))
271 #endif /* !SAN_RUNTIME */
272 #else /* !SAN_NEEDS_INTERCEPTORS */
273 #define bcopy(from, to, len) __builtin_memmove((to), (from), (len))
274 #define bzero(buf, len) __builtin_memset((buf), 0, (len))
275 #define bcmp(b1, b2, len) __builtin_memcmp((b1), (b2), (len))
276 #define memset(buf, c, len) __builtin_memset((buf), (c), (len))
277 #define memcpy(to, from, len) __builtin_memcpy((to), (from), (len))
278 #define memmove(dest, src, n) __builtin_memmove((dest), (src), (n))
279 #define memcmp(b1, b2, len) __builtin_memcmp((b1), (b2), (len))
280 #endif /* SAN_NEEDS_INTERCEPTORS */
281
282 void *memset_early(void * _Nonnull buf, int c, size_t len);
283 #define bzero_early(buf, len) memset_early((buf), 0, (len))
284 void *memcpy_early(void * _Nonnull to, const void * _Nonnull from, size_t len);
285 void *memmove_early(void * _Nonnull dest, const void * _Nonnull src, size_t n);
286 #define bcopy_early(from, to, len) memmove_early((to), (from), (len))
287
288 #define copystr(src, dst, len, outlen) ({ \
289 size_t __r, __len, *__outlen; \
290 \
291 __len = (len); \
292 __outlen = (outlen); \
293 __r = strlcpy((dst), (src), __len); \
294 if (__outlen != NULL) \
295 *__outlen = ((__r >= __len) ? __len : __r + 1); \
296 ((__r >= __len) ? ENAMETOOLONG : 0); \
297 })
298
299 int copyinstr(const void * __restrict udaddr,
300 void * _Nonnull __restrict kaddr, size_t len,
301 size_t * __restrict lencopied);
302 int copyin(const void * __restrict udaddr,
303 void * _Nonnull __restrict kaddr, size_t len);
304 int copyin_nofault(const void * __restrict udaddr,
305 void * _Nonnull __restrict kaddr, size_t len);
306 int copyout(const void * _Nonnull __restrict kaddr,
307 void * __restrict udaddr, size_t len);
308 int copyout_nofault(const void * _Nonnull __restrict kaddr,
309 void * __restrict udaddr, size_t len);
310
311 #ifdef SAN_NEEDS_INTERCEPTORS
312 int SAN_INTERCEPTOR(copyin)(const void *, void *, size_t);
313 int SAN_INTERCEPTOR(copyinstr)(const void *, void *, size_t, size_t *);
314 int SAN_INTERCEPTOR(copyout)(const void *, void *, size_t);
315 #ifndef SAN_RUNTIME
316 #define copyin(u, k, l) SAN_INTERCEPTOR(copyin)((u), (k), (l))
317 #define copyinstr(u, k, l, lc) SAN_INTERCEPTOR(copyinstr)((u), (k), (l), (lc))
318 #define copyout(k, u, l) SAN_INTERCEPTOR(copyout)((k), (u), (l))
319 #endif /* !SAN_RUNTIME */
320 #endif /* SAN_NEEDS_INTERCEPTORS */
321
322 int fubyte(volatile const void *base);
323 long fuword(volatile const void *base);
324 int fuword16(volatile const void *base);
325 int32_t fuword32(volatile const void *base);
326 int64_t fuword64(volatile const void *base);
327 int fueword(volatile const void *base, long *val);
328 int fueword32(volatile const void *base, int32_t *val);
329 int fueword64(volatile const void *base, int64_t *val);
330 int subyte(volatile void *base, int byte);
331 int suword(volatile void *base, long word);
332 int suword16(volatile void *base, int word);
333 int suword32(volatile void *base, int32_t word);
334 int suword64(volatile void *base, int64_t word);
335 uint32_t casuword32(volatile uint32_t *base, uint32_t oldval, uint32_t newval);
336 u_long casuword(volatile u_long *p, u_long oldval, u_long newval);
337 int casueword32(volatile uint32_t *base, uint32_t oldval, uint32_t *oldvalp,
338 uint32_t newval);
339 int casueword(volatile u_long *p, u_long oldval, u_long *oldvalp,
340 u_long newval);
341
342 #if defined(SAN_NEEDS_INTERCEPTORS) && !defined(KCSAN)
343 int SAN_INTERCEPTOR(fubyte)(volatile const void *base);
344 int SAN_INTERCEPTOR(fuword16)(volatile const void *base);
345 int SAN_INTERCEPTOR(fueword)(volatile const void *base, long *val);
346 int SAN_INTERCEPTOR(fueword32)(volatile const void *base, int32_t *val);
347 int SAN_INTERCEPTOR(fueword64)(volatile const void *base, int64_t *val);
348 int SAN_INTERCEPTOR(subyte)(volatile void *base, int byte);
349 int SAN_INTERCEPTOR(suword)(volatile void *base, long word);
350 int SAN_INTERCEPTOR(suword16)(volatile void *base, int word);
351 int SAN_INTERCEPTOR(suword32)(volatile void *base, int32_t word);
352 int SAN_INTERCEPTOR(suword64)(volatile void *base, int64_t word);
353 int SAN_INTERCEPTOR(casueword32)(volatile uint32_t *base, uint32_t oldval,
354 uint32_t *oldvalp, uint32_t newval);
355 int SAN_INTERCEPTOR(casueword)(volatile u_long *p, u_long oldval,
356 u_long *oldvalp, u_long newval);
357 #ifndef SAN_RUNTIME
358 #define fubyte(b) SAN_INTERCEPTOR(fubyte)((b))
359 #define fuword16(b) SAN_INTERCEPTOR(fuword16)((b))
360 #define fueword(b, v) SAN_INTERCEPTOR(fueword)((b), (v))
361 #define fueword32(b, v) SAN_INTERCEPTOR(fueword32)((b), (v))
362 #define fueword64(b, v) SAN_INTERCEPTOR(fueword64)((b), (v))
363 #define subyte(b, w) SAN_INTERCEPTOR(subyte)((b), (w))
364 #define suword(b, w) SAN_INTERCEPTOR(suword)((b), (w))
365 #define suword16(b, w) SAN_INTERCEPTOR(suword16)((b), (w))
366 #define suword32(b, w) SAN_INTERCEPTOR(suword32)((b), (w))
367 #define suword64(b, w) SAN_INTERCEPTOR(suword64)((b), (w))
368 #define casueword32(b, o, p, n) SAN_INTERCEPTOR(casueword32)((b), (o), (p), (n))
369 #define casueword(b, o, p, n) SAN_INTERCEPTOR(casueword)((b), (o), (p), (n))
370 #endif /* !SAN_RUNTIME */
371 #endif /* SAN_NEEDS_INTERCEPTORS && !KCSAN */
372
373 int sysbeep(int hertz, sbintime_t duration);
374
375 void hardclock(int cnt, int usermode);
376 void hardclock_sync(int cpu);
377 void statclock(int cnt, int usermode);
378 void profclock(int cnt, int usermode, uintfptr_t pc);
379
380 int hardclockintr(void);
381
382 void startprofclock(struct proc *);
383 void stopprofclock(struct proc *);
384 void cpu_startprofclock(void);
385 void cpu_stopprofclock(void);
386 void suspendclock(void);
387 void resumeclock(void);
388 sbintime_t cpu_idleclock(void);
389 void cpu_activeclock(void);
390 void cpu_new_callout(int cpu, sbintime_t bt, sbintime_t bt_opt);
391 void cpu_et_frequency(struct eventtimer *et, uint64_t newfreq);
392 extern int cpu_disable_c2_sleep;
393 extern int cpu_disable_c3_sleep;
394
395 extern void (*tcp_hpts_softclock)(void);
396 extern volatile uint32_t __read_frequently hpts_that_need_softclock;
397
398 #define tcp_hpts_softclock() do { \
399 if (hpts_that_need_softclock > 0) \
400 tcp_hpts_softclock(); \
401 } while (0)
402
403 char *kern_getenv(const char *name);
404 void freeenv(char *env);
405 int getenv_int(const char *name, int *data);
406 int getenv_uint(const char *name, unsigned int *data);
407 int getenv_long(const char *name, long *data);
408 int getenv_ulong(const char *name, unsigned long *data);
409 int getenv_string(const char *name, char *data, int size);
410 int getenv_int64(const char *name, int64_t *data);
411 int getenv_uint64(const char *name, uint64_t *data);
412 int getenv_quad(const char *name, quad_t *data);
413 int getenv_bool(const char *name, bool *data);
414 bool getenv_is_true(const char *name);
415 bool getenv_is_false(const char *name);
416 int kern_setenv(const char *name, const char *value);
417 int kern_unsetenv(const char *name);
418 int testenv(const char *name);
419
420 int getenv_array(const char *name, void *data, int size, int *psize,
421 int type_size, bool allow_signed);
422 #define GETENV_UNSIGNED false /* negative numbers not allowed */
423 #define GETENV_SIGNED true /* negative numbers allowed */
424
425 typedef uint64_t (cpu_tick_f)(void);
426 void set_cputicker(cpu_tick_f *func, uint64_t freq, bool isvariable);
427 extern cpu_tick_f *cpu_ticks;
428 uint64_t cpu_tickrate(void);
429 uint64_t cputick2usec(uint64_t tick);
430
431 #include <sys/libkern.h>
432
433 /* Initialize the world */
434 void consinit(void);
435 void cpu_initclocks(void);
436 void cpu_initclocks_bsp(void);
437 void cpu_initclocks_ap(void);
438 void usrinfoinit(void);
439
440 /* Finalize the world */
441 void kern_reboot(int) __dead2;
442 void shutdown_nice(int);
443
444 /* Stubs for obsolete functions that used to be for interrupt management */
splhigh(void)445 static __inline intrmask_t splhigh(void) { return 0; }
splimp(void)446 static __inline intrmask_t splimp(void) { return 0; }
splnet(void)447 static __inline intrmask_t splnet(void) { return 0; }
spltty(void)448 static __inline intrmask_t spltty(void) { return 0; }
splx(intrmask_t ipl __unused)449 static __inline void splx(intrmask_t ipl __unused) { return; }
450
451 /*
452 * Common `proc' functions are declared here so that proc.h can be included
453 * less often.
454 */
455 int _sleep(const void * _Nonnull chan, struct lock_object *lock, int pri,
456 const char *wmesg, sbintime_t sbt, sbintime_t pr, int flags);
457 #define msleep(chan, mtx, pri, wmesg, timo) \
458 _sleep((chan), &(mtx)->lock_object, (pri), (wmesg), \
459 tick_sbt * (timo), 0, C_HARDCLOCK)
460 #define msleep_sbt(chan, mtx, pri, wmesg, bt, pr, flags) \
461 _sleep((chan), &(mtx)->lock_object, (pri), (wmesg), (bt), (pr), \
462 (flags))
463 int msleep_spin_sbt(const void * _Nonnull chan, struct mtx *mtx,
464 const char *wmesg, sbintime_t sbt, sbintime_t pr, int flags);
465 #define msleep_spin(chan, mtx, wmesg, timo) \
466 msleep_spin_sbt((chan), (mtx), (wmesg), tick_sbt * (timo), \
467 0, C_HARDCLOCK)
468 int pause_sbt(const char *wmesg, sbintime_t sbt, sbintime_t pr,
469 int flags);
470 static __inline int
pause(const char * wmesg,int timo)471 pause(const char *wmesg, int timo)
472 {
473 return (pause_sbt(wmesg, tick_sbt * timo, 0, C_HARDCLOCK));
474 }
475 #define pause_sig(wmesg, timo) \
476 pause_sbt((wmesg), tick_sbt * (timo), 0, C_HARDCLOCK | C_CATCH)
477 #define tsleep(chan, pri, wmesg, timo) \
478 _sleep((chan), NULL, (pri), (wmesg), tick_sbt * (timo), \
479 0, C_HARDCLOCK)
480 #define tsleep_sbt(chan, pri, wmesg, bt, pr, flags) \
481 _sleep((chan), NULL, (pri), (wmesg), (bt), (pr), (flags))
482 void wakeup(const void *chan);
483 void wakeup_one(const void *chan);
484 void wakeup_any(const void *chan);
485
486 /*
487 * Common `struct cdev *' stuff are declared here to avoid #include poisoning
488 */
489
490 struct cdev;
491 dev_t dev2udev(struct cdev *x);
492 const char *devtoname(struct cdev *cdev);
493
494 #ifdef __LP64__
495 size_t devfs_iosize_max(void);
496 size_t iosize_max(void);
497 #endif
498
499 int poll_no_poll(int events);
500
501 /* XXX: Should be void nanodelay(u_int nsec); */
502 void DELAY(int usec);
503
504 int kcmp_cmp(uintptr_t a, uintptr_t b);
505
506 /* Root mount holdback API */
507 struct root_hold_token {
508 int flags;
509 const char *who;
510 TAILQ_ENTRY(root_hold_token) list;
511 };
512
513 struct root_hold_token *root_mount_hold(const char *identifier);
514 void root_mount_hold_token(const char *identifier, struct root_hold_token *h);
515 void root_mount_rel(struct root_hold_token *h);
516 int root_mounted(void);
517
518 /*
519 * Unit number allocation API. (kern/subr_unit.c)
520 */
521 struct unrhdr;
522 #define UNR_NO_MTX ((void *)(uintptr_t)-1)
523 struct unrhdr *new_unrhdr(int low, int high, struct mtx *mutex);
524 void init_unrhdr(struct unrhdr *uh, int low, int high, struct mtx *mutex);
525 void delete_unrhdr(struct unrhdr *uh);
526 void clear_unrhdr(struct unrhdr *uh);
527 void clean_unrhdr(struct unrhdr *uh);
528 void clean_unrhdrl(struct unrhdr *uh);
529 int alloc_unr(struct unrhdr *uh);
530 int alloc_unr_specific(struct unrhdr *uh, u_int item);
531 int alloc_unrl(struct unrhdr *uh);
532 void free_unr(struct unrhdr *uh, u_int item);
533 void *create_iter_unr(struct unrhdr *uh);
534 int next_iter_unr(void *handle);
535 void free_iter_unr(void *handle);
536
537 struct unrhdr64 {
538 uint64_t counter;
539 };
540
541 static __inline void
new_unrhdr64(struct unrhdr64 * unr64,uint64_t low)542 new_unrhdr64(struct unrhdr64 *unr64, uint64_t low)
543 {
544
545 unr64->counter = low;
546 }
547
548 static __inline uint64_t
alloc_unr64(struct unrhdr64 * unr64)549 alloc_unr64(struct unrhdr64 *unr64)
550 {
551
552 return (atomic_fetchadd_64(&unr64->counter, 1));
553 }
554
555 void intr_prof_stack_use(struct thread *td, struct trapframe *frame);
556
557 void counted_warning(unsigned *counter, const char *msg);
558
559 /*
560 * APIs to manage deprecation and obsolescence.
561 */
562 void _gone_in(int major, const char *msg);
563 void _gone_in_dev(device_t dev, int major, const char *msg);
564 #ifdef NO_OBSOLETE_CODE
565 #define __gone_ok(m, msg) \
566 _Static_assert(m < P_OSREL_MAJOR(__FreeBSD_version)), \
567 "Obsolete code: " msg);
568 #else
569 #define __gone_ok(m, msg)
570 #endif
571 #define gone_in(major, msg) __gone_ok(major, msg) _gone_in(major, msg)
572 #define gone_in_dev(dev, major, msg) __gone_ok(major, msg) _gone_in_dev(dev, major, msg)
573
574 #ifdef INVARIANTS
575 #define __diagused
576 #else
577 #define __diagused __unused
578 #endif
579
580 #ifdef WITNESS
581 #define __witness_used
582 #else
583 #define __witness_used __unused
584 #endif
585
586 #endif /* _KERNEL */
587
588 __NULLABILITY_PRAGMA_POP
589 #endif /* !_SYS_SYSTM_H_ */
590