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/queue.h>
48 #include <sys/stdint.h> /* for people using printf mainly */
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 *panicstr; /* panic message */
57 extern bool panicked;
58 #define KERNEL_PANICKED() __predict_false(panicked)
59 extern char version[]; /* system version */
60 extern char compiler_version[]; /* compiler version */
61 extern char copyright[]; /* system copyright */
62 extern int kstack_pages; /* number of kernel stack pages */
63
64 extern u_long pagesizes[]; /* supported page sizes */
65 extern long physmem; /* physical memory */
66 extern long realmem; /* 'real' memory */
67
68 extern char *rootdevnames[2]; /* names of possible root devices */
69
70 extern int boothowto; /* reboot flags, from console subsystem */
71 extern int bootverbose; /* nonzero to print verbose messages */
72
73 extern int maxusers; /* system tune hint */
74 extern int ngroups_max; /* max # of supplemental groups */
75 extern int vm_guest; /* Running as virtual machine guest? */
76
77 extern u_long maxphys; /* max raw I/O transfer size */
78
79 /*
80 * Detected virtual machine guest types. The intention is to expand
81 * and/or add to the VM_GUEST_VM type if specific VM functionality is
82 * ever implemented (e.g. vendor-specific paravirtualization features).
83 * Keep in sync with vm_guest_sysctl_names[].
84 */
85 enum VM_GUEST { VM_GUEST_NO = 0, VM_GUEST_VM, VM_GUEST_XEN, VM_GUEST_HV,
86 VM_GUEST_VMWARE, VM_GUEST_KVM, VM_GUEST_BHYVE, VM_GUEST_VBOX,
87 VM_GUEST_PARALLELS, VM_LAST };
88
89 #ifdef INVARIANTS /* The option is always available */
90 #define VNASSERT(exp, vp, msg) do { \
91 if (__predict_false(!(exp))) { \
92 vn_printf(vp, "VNASSERT failed: %s not true at %s:%d (%s)\n",\
93 #exp, __FILE__, __LINE__, __func__); \
94 kassert_panic msg; \
95 } \
96 } while (0)
97 #define VNPASS(exp, vp) do { \
98 const char *_exp = #exp; \
99 VNASSERT(exp, vp, ("condition %s not met at %s:%d (%s)", \
100 _exp, __FILE__, __LINE__, __func__)); \
101 } while (0)
102 #define __assert_unreachable() \
103 panic("executing segment marked as unreachable at %s:%d (%s)\n", \
104 __FILE__, __LINE__, __func__)
105 #else
106 #define VNASSERT(exp, vp, msg) do { \
107 } while (0)
108 #define VNPASS(exp, vp) do { \
109 } while (0)
110 #define __assert_unreachable() __unreachable()
111 #endif
112
113 #ifndef CTASSERT /* Allow lint to override */
114 #define CTASSERT(x) _Static_assert(x, "compile-time assertion failed")
115 #endif
116 #endif /* KERNEL */
117
118 /*
119 * These functions need to be declared before the KASSERT macro is invoked in
120 * !KASSERT_PANIC_OPTIONAL builds, so their declarations are sort of out of
121 * place compared to other function definitions in this header. On the other
122 * hand, this header is a bit disorganized anyway.
123 */
124 void panic(const char *, ...) __dead2 __printflike(1, 2);
125 void vpanic(const char *, __va_list) __dead2 __printflike(1, 0);
126
127
128 #if defined(_STANDALONE)
129 struct ucred;
130 /*
131 * Until we have more experience with KASSERTS that are called
132 * from the boot loader, they are off. The bootloader does this
133 * a little differently than the kernel (we just call printf atm).
134 * we avoid most of the common functions in the boot loader, so
135 * declare printf() here too.
136 */
137 int printf(const char *, ...) __printflike(1, 2);
138 # define kassert_panic printf
139 #else /* !_STANDALONE */
140 # if defined(WITNESS) || defined(INVARIANT_SUPPORT)
141 # ifdef KASSERT_PANIC_OPTIONAL
142 void kassert_panic(const char *fmt, ...) __printflike(1, 2);
143 # else
144 # define kassert_panic panic
145 # endif /* KASSERT_PANIC_OPTIONAL */
146 # endif /* defined(WITNESS) || defined(INVARIANT_SUPPORT) */
147 #endif /* _STANDALONE */
148
149 #if defined(INVARIANTS) || defined(_STANDALONE)
150 #define KASSERT(exp,msg) do { \
151 if (__predict_false(!(exp))) \
152 kassert_panic msg; \
153 } while (0)
154 #else /* !INVARIANTS && !_STANDALONE */
155 #define KASSERT(exp,msg) do { \
156 } while (0)
157 #endif /* INVARIANTS || _STANDALONE */
158
159 /*
160 * Helpful macros for quickly coming up with assertions with informative
161 * panic messages.
162 */
163 #define MPASS(ex) MPASS4(ex, #ex, __FILE__, __LINE__)
164 #define MPASS2(ex, what) MPASS4(ex, what, __FILE__, __LINE__)
165 #define MPASS3(ex, file, line) MPASS4(ex, #ex, file, line)
166 #define MPASS4(ex, what, file, line) \
167 KASSERT((ex), ("Assertion %s failed at %s:%d", what, file, line))
168
169 /*
170 * Align variables.
171 */
172 #define __read_mostly __section(".data.read_mostly")
173 #define __read_frequently __section(".data.read_frequently")
174 #define __exclusive_cache_line __aligned(CACHE_LINE_SIZE) \
175 __section(".data.exclusive_cache_line")
176 #ifdef _KERNEL
177 #include <sys/param.h> /* MAXCPU */
178 #include <sys/pcpu.h> /* curthread */
179 #ifndef FSTACK
180 #include <sys/kpilite.h>
181 #endif
182
183 /*
184 * Assert that a pointer can be loaded from memory atomically.
185 *
186 * This assertion enforces stronger alignment than necessary. For example,
187 * on some architectures, atomicity for unaligned loads will depend on
188 * whether or not the load spans multiple cache lines.
189 */
190 #define ASSERT_ATOMIC_LOAD_PTR(var, msg) \
191 KASSERT(sizeof(var) == sizeof(void *) && \
192 ((uintptr_t)&(var) & (sizeof(void *) - 1)) == 0, msg)
193
194 /*
195 * Assert that a thread is in critical(9) section.
196 */
197 #define CRITICAL_ASSERT(td) \
198 KASSERT((td)->td_critnest >= 1, ("Not in critical section"));
199
200 /*
201 * If we have already panic'd and this is the thread that called
202 * panic(), then don't block on any mutexes but silently succeed.
203 * Otherwise, the kernel will deadlock since the scheduler isn't
204 * going to run the thread that holds any lock we need.
205 */
206 #define SCHEDULER_STOPPED_TD(td) ({ \
207 MPASS((td) == curthread); \
208 __predict_false((td)->td_stopsched); \
209 })
210 #define SCHEDULER_STOPPED() SCHEDULER_STOPPED_TD(curthread)
211
212 extern int osreldate;
213
214 extern const void *zero_region; /* address space maps to a zeroed page */
215
216 extern int unmapped_buf_allowed;
217
218 #ifdef __LP64__
219 #define IOSIZE_MAX iosize_max()
220 #define DEVFS_IOSIZE_MAX devfs_iosize_max()
221 #else
222 #define IOSIZE_MAX SSIZE_MAX
223 #define DEVFS_IOSIZE_MAX SSIZE_MAX
224 #endif
225
226 /*
227 * General function declarations.
228 */
229
230 struct inpcb;
231 struct lock_object;
232 struct malloc_type;
233 struct mtx;
234 struct proc;
235 struct socket;
236 struct thread;
237 struct tty;
238 struct ucred;
239 struct uio;
240 struct _jmp_buf;
241 struct trapframe;
242 struct eventtimer;
243
244 int setjmp(struct _jmp_buf *) __returns_twice;
245 void longjmp(struct _jmp_buf *, int) __dead2;
246 int dumpstatus(vm_offset_t addr, off_t count);
247 int nullop(void);
248 int eopnotsupp(void);
249 int ureadc(int, struct uio *);
250 void hashdestroy(void *, struct malloc_type *, u_long);
251 void *hashinit(int count, struct malloc_type *type, u_long *hashmask);
252 void *hashinit_flags(int count, struct malloc_type *type,
253 u_long *hashmask, int flags);
254 #define HASH_NOWAIT 0x00000001
255 #define HASH_WAITOK 0x00000002
256
257 void *phashinit(int count, struct malloc_type *type, u_long *nentries);
258 void *phashinit_flags(int count, struct malloc_type *type, u_long *nentries,
259 int flags);
260 void g_waitidle(void);
261
262 void cpu_flush_dcache(void *, size_t);
263 void cpu_rootconf(void);
264 void critical_enter_KBI(void);
265 void critical_exit_KBI(void);
266 void critical_exit_preempt(void);
267 void init_param1(void);
268 void init_param2(long physpages);
269 void init_static_kenv(char *, size_t);
270 void tablefull(const char *);
271
272 /*
273 * Allocate per-thread "current" state in the linuxkpi
274 */
275 extern int (*lkpi_alloc_current)(struct thread *, int);
276 int linux_alloc_current_noop(struct thread *, int);
277
278 #if defined(KLD_MODULE) || defined(KTR_CRITICAL) || !defined(_KERNEL) || defined(GENOFFSET)
279 #define critical_enter() critical_enter_KBI()
280 #define critical_exit() critical_exit_KBI()
281 #else
282 static __inline void
critical_enter(void)283 critical_enter(void)
284 {
285 #ifndef FSTACK
286 struct thread_lite *td;
287
288 td = (struct thread_lite *)curthread;
289 td->td_critnest++;
290 atomic_interrupt_fence();
291 #endif
292 }
293
294 static __inline void
critical_exit(void)295 critical_exit(void)
296 {
297 #ifndef FSTACK
298 struct thread_lite *td;
299
300 td = (struct thread_lite *)curthread;
301 KASSERT(td->td_critnest != 0,
302 ("critical_exit: td_critnest == 0"));
303 atomic_interrupt_fence();
304 td->td_critnest--;
305 atomic_interrupt_fence();
306 if (__predict_false(td->td_owepreempt))
307 critical_exit_preempt();
308 #endif
309 }
310 #endif
311
312 #ifdef EARLY_PRINTF
313 typedef void early_putc_t(int ch);
314 extern early_putc_t *early_putc;
315 #endif
316 int kvprintf(char const *, void (*)(int, void*), void *, int,
317 __va_list) __printflike(1, 0);
318 void log(int, const char *, ...) __printflike(2, 3);
319 void log_console(struct uio *);
320 void vlog(int, const char *, __va_list) __printflike(2, 0);
321 int asprintf(char **ret, struct malloc_type *mtp, const char *format,
322 ...) __printflike(3, 4);
323 int printf(const char *, ...) __printflike(1, 2);
324 int snprintf(char *, size_t, const char *, ...) __printflike(3, 4);
325 int sprintf(char *buf, const char *, ...) __printflike(2, 3);
326 int uprintf(const char *, ...) __printflike(1, 2);
327 int vprintf(const char *, __va_list) __printflike(1, 0);
328 int vasprintf(char **ret, struct malloc_type *mtp, const char *format,
329 __va_list ap) __printflike(3, 0);
330 int vsnprintf(char *, size_t, const char *, __va_list) __printflike(3, 0);
331 int vsnrprintf(char *, size_t, int, const char *, __va_list) __printflike(4, 0);
332 int vsprintf(char *buf, const char *, __va_list) __printflike(2, 0);
333 int sscanf(const char *, char const * _Nonnull, ...) __scanflike(2, 3);
334 int vsscanf(const char * _Nonnull, char const * _Nonnull, __va_list) __scanflike(2, 0);
335 long strtol(const char *, char **, int);
336 u_long strtoul(const char *, char **, int);
337 quad_t strtoq(const char *, char **, int);
338 u_quad_t strtouq(const char *, char **, int);
339 void tprintf(struct proc *p, int pri, const char *, ...) __printflike(3, 4);
340 void vtprintf(struct proc *, int, const char *, __va_list) __printflike(3, 0);
341 void hexdump(const void *ptr, int length, const char *hdr, int flags);
342 #define HD_COLUMN_MASK 0xff
343 #define HD_DELIM_MASK 0xff00
344 #define HD_OMIT_COUNT (1 << 16)
345 #define HD_OMIT_HEX (1 << 17)
346 #define HD_OMIT_CHARS (1 << 18)
347
348 #define ovbcopy(f, t, l) bcopy((f), (t), (l))
349 void bcopy(const void * _Nonnull from, void * _Nonnull to, size_t len);
350 void bzero(void * _Nonnull buf, size_t len);
351 void explicit_bzero(void * _Nonnull, size_t);
352 int bcmp(const void *b1, const void *b2, size_t len);
353
354 void *memset(void * _Nonnull buf, int c, size_t len);
355 void *memcpy(void * _Nonnull to, const void * _Nonnull from, size_t len);
356 void *memmove(void * _Nonnull dest, const void * _Nonnull src, size_t n);
357 int memcmp(const void *b1, const void *b2, size_t len);
358
359 #ifdef KCSAN
360 void *kcsan_memset(void *, int, size_t);
361 void *kcsan_memcpy(void *, const void *, size_t);
362 void *kcsan_memmove(void *, const void *, size_t);
363 int kcsan_memcmp(const void *, const void *, size_t);
364 #define bcopy(from, to, len) kcsan_memmove((to), (from), (len))
365 #define bzero(buf, len) kcsan_memset((buf), 0, (len))
366 #define bcmp(b1, b2, len) kcsan_memcmp((b1), (b2), (len))
367 #define memset(buf, c, len) kcsan_memset((buf), (c), (len))
368 #define memcpy(to, from, len) kcsan_memcpy((to), (from), (len))
369 #define memmove(dest, src, n) kcsan_memmove((dest), (src), (n))
370 #define memcmp(b1, b2, len) kcsan_memcmp((b1), (b2), (len))
371 #else
372 #define bcopy(from, to, len) __builtin_memmove((to), (from), (len))
373 #define bzero(buf, len) __builtin_memset((buf), 0, (len))
374 #define bcmp(b1, b2, len) __builtin_memcmp((b1), (b2), (len))
375 #define memset(buf, c, len) __builtin_memset((buf), (c), (len))
376 #define memcpy(to, from, len) __builtin_memcpy((to), (from), (len))
377 #define memmove(dest, src, n) __builtin_memmove((dest), (src), (n))
378 #define memcmp(b1, b2, len) __builtin_memcmp((b1), (b2), (len))
379 #endif
380
381 void *memset_early(void * _Nonnull buf, int c, size_t len);
382 #define bzero_early(buf, len) memset_early((buf), 0, (len))
383 void *memcpy_early(void * _Nonnull to, const void * _Nonnull from, size_t len);
384 void *memmove_early(void * _Nonnull dest, const void * _Nonnull src, size_t n);
385 #define bcopy_early(from, to, len) memmove_early((to), (from), (len))
386
387 #define copystr(src, dst, len, outlen) ({ \
388 size_t __r, __len, *__outlen; \
389 \
390 __len = (len); \
391 __outlen = (outlen); \
392 __r = strlcpy((dst), (src), __len); \
393 if (__outlen != NULL) \
394 *__outlen = ((__r >= __len) ? __len : __r + 1); \
395 ((__r >= __len) ? ENAMETOOLONG : 0); \
396 })
397
398 int copyinstr(const void * __restrict udaddr,
399 void * _Nonnull __restrict kaddr, size_t len,
400 size_t * __restrict lencopied);
401 int copyin(const void * __restrict udaddr,
402 void * _Nonnull __restrict kaddr, size_t len);
403 int copyin_nofault(const void * __restrict udaddr,
404 void * _Nonnull __restrict kaddr, size_t len);
405 int copyout(const void * _Nonnull __restrict kaddr,
406 void * __restrict udaddr, size_t len);
407 int copyout_nofault(const void * _Nonnull __restrict kaddr,
408 void * __restrict udaddr, size_t len);
409
410 #ifdef KCSAN
411 int kcsan_copyin(const void *, void *, size_t);
412 int kcsan_copyinstr(const void *, void *, size_t, size_t *);
413 int kcsan_copyout(const void *, void *, size_t);
414 #define copyin(u, k, l) kcsan_copyin((u), (k), (l))
415 #define copyinstr(u, k, l, lc) kcsan_copyinstr((u), (k), (l), (lc))
416 #define copyout(k, u, l) kcsan_copyout((k), (u), (l))
417 #endif
418
419 int fubyte(volatile const void *base);
420 long fuword(volatile const void *base);
421 int fuword16(volatile const void *base);
422 int32_t fuword32(volatile const void *base);
423 int64_t fuword64(volatile const void *base);
424 int fueword(volatile const void *base, long *val);
425 int fueword32(volatile const void *base, int32_t *val);
426 int fueword64(volatile const void *base, int64_t *val);
427 int subyte(volatile void *base, int byte);
428 int suword(volatile void *base, long word);
429 int suword16(volatile void *base, int word);
430 int suword32(volatile void *base, int32_t word);
431 int suword64(volatile void *base, int64_t word);
432 uint32_t casuword32(volatile uint32_t *base, uint32_t oldval, uint32_t newval);
433 u_long casuword(volatile u_long *p, u_long oldval, u_long newval);
434 int casueword32(volatile uint32_t *base, uint32_t oldval, uint32_t *oldvalp,
435 uint32_t newval);
436 int casueword(volatile u_long *p, u_long oldval, u_long *oldvalp,
437 u_long newval);
438
439 void realitexpire(void *);
440
441 int sysbeep(int hertz, int period);
442
443 void hardclock(int cnt, int usermode);
444 void hardclock_sync(int cpu);
445 void softclock(void *);
446 void statclock(int cnt, int usermode);
447 void profclock(int cnt, int usermode, uintfptr_t pc);
448
449 int hardclockintr(void);
450
451 void startprofclock(struct proc *);
452 void stopprofclock(struct proc *);
453 void cpu_startprofclock(void);
454 void cpu_stopprofclock(void);
455 void suspendclock(void);
456 void resumeclock(void);
457 sbintime_t cpu_idleclock(void);
458 void cpu_activeclock(void);
459 void cpu_new_callout(int cpu, sbintime_t bt, sbintime_t bt_opt);
460 void cpu_et_frequency(struct eventtimer *et, uint64_t newfreq);
461 extern int cpu_disable_c2_sleep;
462 extern int cpu_disable_c3_sleep;
463
464 char *kern_getenv(const char *name);
465 void freeenv(char *env);
466 int getenv_int(const char *name, int *data);
467 int getenv_uint(const char *name, unsigned int *data);
468 int getenv_long(const char *name, long *data);
469 int getenv_ulong(const char *name, unsigned long *data);
470 int getenv_string(const char *name, char *data, int size);
471 int getenv_int64(const char *name, int64_t *data);
472 int getenv_uint64(const char *name, uint64_t *data);
473 int getenv_quad(const char *name, quad_t *data);
474 int getenv_bool(const char *name, bool *data);
475 bool getenv_is_true(const char *name);
476 bool getenv_is_false(const char *name);
477 int kern_setenv(const char *name, const char *value);
478 int kern_unsetenv(const char *name);
479 int testenv(const char *name);
480
481 int getenv_array(const char *name, void *data, int size, int *psize,
482 int type_size, bool allow_signed);
483 #define GETENV_UNSIGNED false /* negative numbers not allowed */
484 #define GETENV_SIGNED true /* negative numbers allowed */
485
486 typedef uint64_t (cpu_tick_f)(void);
487 void set_cputicker(cpu_tick_f *func, uint64_t freq, unsigned var);
488 extern cpu_tick_f *cpu_ticks;
489 uint64_t cpu_tickrate(void);
490 uint64_t cputick2usec(uint64_t tick);
491
492 #include <sys/libkern.h>
493
494 /* Initialize the world */
495 void consinit(void);
496 void cpu_initclocks(void);
497 void cpu_initclocks_bsp(void);
498 void cpu_initclocks_ap(void);
499 void usrinfoinit(void);
500
501 /* Finalize the world */
502 void kern_reboot(int) __dead2;
503 void shutdown_nice(int);
504
505 /* Stubs for obsolete functions that used to be for interrupt management */
splhigh(void)506 static __inline intrmask_t splhigh(void) { return 0; }
splimp(void)507 static __inline intrmask_t splimp(void) { return 0; }
splnet(void)508 static __inline intrmask_t splnet(void) { return 0; }
spltty(void)509 static __inline intrmask_t spltty(void) { return 0; }
splx(intrmask_t ipl __unused)510 static __inline void splx(intrmask_t ipl __unused) { return; }
511
512 /*
513 * Common `proc' functions are declared here so that proc.h can be included
514 * less often.
515 */
516 int _sleep(const void * _Nonnull chan, struct lock_object *lock, int pri,
517 const char *wmesg, sbintime_t sbt, sbintime_t pr, int flags);
518 #define msleep(chan, mtx, pri, wmesg, timo) \
519 _sleep((chan), &(mtx)->lock_object, (pri), (wmesg), \
520 tick_sbt * (timo), 0, C_HARDCLOCK)
521 #define msleep_sbt(chan, mtx, pri, wmesg, bt, pr, flags) \
522 _sleep((chan), &(mtx)->lock_object, (pri), (wmesg), (bt), (pr), \
523 (flags))
524 int msleep_spin_sbt(const void * _Nonnull chan, struct mtx *mtx,
525 const char *wmesg, sbintime_t sbt, sbintime_t pr, int flags);
526 #define msleep_spin(chan, mtx, wmesg, timo) \
527 msleep_spin_sbt((chan), (mtx), (wmesg), tick_sbt * (timo), \
528 0, C_HARDCLOCK)
529 int pause_sbt(const char *wmesg, sbintime_t sbt, sbintime_t pr,
530 int flags);
531 #define pause(wmesg, timo) \
532 pause_sbt((wmesg), tick_sbt * (timo), 0, C_HARDCLOCK)
533 #define pause_sig(wmesg, timo) \
534 pause_sbt((wmesg), tick_sbt * (timo), 0, C_HARDCLOCK | C_CATCH)
535 #define tsleep(chan, pri, wmesg, timo) \
536 _sleep((chan), NULL, (pri), (wmesg), tick_sbt * (timo), \
537 0, C_HARDCLOCK)
538 #define tsleep_sbt(chan, pri, wmesg, bt, pr, flags) \
539 _sleep((chan), NULL, (pri), (wmesg), (bt), (pr), (flags))
540 void wakeup(const void *chan);
541 void wakeup_one(const void *chan);
542 void wakeup_any(const void *chan);
543
544 /*
545 * Common `struct cdev *' stuff are declared here to avoid #include poisoning
546 */
547
548 struct cdev;
549 dev_t dev2udev(struct cdev *x);
550 const char *devtoname(struct cdev *cdev);
551
552 #ifdef __LP64__
553 size_t devfs_iosize_max(void);
554 size_t iosize_max(void);
555 #endif
556
557 int poll_no_poll(int events);
558
559 /* XXX: Should be void nanodelay(u_int nsec); */
560 void DELAY(int usec);
561
562 /* Root mount holdback API */
563 struct root_hold_token {
564 int flags;
565 const char *who;
566 TAILQ_ENTRY(root_hold_token) list;
567 };
568
569 struct root_hold_token *root_mount_hold(const char *identifier);
570 void root_mount_hold_token(const char *identifier, struct root_hold_token *h);
571 void root_mount_rel(struct root_hold_token *h);
572 int root_mounted(void);
573
574 /*
575 * Unit number allocation API. (kern/subr_unit.c)
576 */
577 struct unrhdr;
578 struct unrhdr *new_unrhdr(int low, int high, struct mtx *mutex);
579 void init_unrhdr(struct unrhdr *uh, int low, int high, struct mtx *mutex);
580 void delete_unrhdr(struct unrhdr *uh);
581 void clear_unrhdr(struct unrhdr *uh);
582 void clean_unrhdr(struct unrhdr *uh);
583 void clean_unrhdrl(struct unrhdr *uh);
584 int alloc_unr(struct unrhdr *uh);
585 int alloc_unr_specific(struct unrhdr *uh, u_int item);
586 int alloc_unrl(struct unrhdr *uh);
587 void free_unr(struct unrhdr *uh, u_int item);
588
589 #ifndef __LP64__
590 #define UNR64_LOCKED
591 #endif
592
593 struct unrhdr64 {
594 uint64_t counter;
595 };
596
597 static __inline void
new_unrhdr64(struct unrhdr64 * unr64,uint64_t low)598 new_unrhdr64(struct unrhdr64 *unr64, uint64_t low)
599 {
600
601 unr64->counter = low;
602 }
603
604 #ifdef UNR64_LOCKED
605 uint64_t alloc_unr64(struct unrhdr64 *);
606 #else
607 static __inline uint64_t
alloc_unr64(struct unrhdr64 * unr64)608 alloc_unr64(struct unrhdr64 *unr64)
609 {
610
611 return (atomic_fetchadd_64(&unr64->counter, 1));
612 }
613 #endif
614
615 void intr_prof_stack_use(struct thread *td, struct trapframe *frame);
616
617 void counted_warning(unsigned *counter, const char *msg);
618
619 /*
620 * APIs to manage deprecation and obsolescence.
621 */
622 struct device;
623 void _gone_in(int major, const char *msg);
624 void _gone_in_dev(struct device *dev, int major, const char *msg);
625 #ifdef NO_OBSOLETE_CODE
626 #define __gone_ok(m, msg) \
627 _Static_assert(m < P_OSREL_MAJOR(__FreeBSD_version)), \
628 "Obsolete code: " msg);
629 #else
630 #define __gone_ok(m, msg)
631 #endif
632 #define gone_in(major, msg) __gone_ok(major, msg) _gone_in(major, msg)
633 #define gone_in_dev(dev, major, msg) __gone_ok(major, msg) _gone_in_dev(dev, major, msg)
634 #endif /* _KERNEL */
635
636 __NULLABILITY_PRAGMA_POP
637
638 #endif /* !_SYS_SYSTM_H_ */
639