master
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
53extern int cold; /* nonzero if we are doing a cold boot */
54extern int suspend_blocked; /* block suspend due to pending shutdown */
55extern int rebooting; /* kern_reboot() has been called. */
56extern const char version[]; /* system version */
57extern const char compiler_version[]; /* compiler version */
58extern const char copyright[]; /* system copyright */
59extern int kstack_pages; /* number of kernel stack pages */
60
61extern u_long pagesizes[]; /* supported page sizes */
62extern long physmem; /* physical memory */
63extern long realmem; /* 'real' memory */
64
65extern char *rootdevnames[2]; /* names of possible root devices */
66
67extern int boothowto; /* reboot flags, from console subsystem */
68extern int bootverbose; /* nonzero to print verbose messages */
69
70extern int maxusers; /* system tune hint */
71extern int ngroups_max; /* max # of supplemental groups */
72extern int vm_guest; /* Running as virtual machine guest? */
73
74extern 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 */
82enum 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)
96struct 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
116extern const int osreldate;
117
118extern const void *zero_region; /* address space maps to a zeroed page */
119
120extern 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
134struct inpcb;
135struct lock_object;
136struct malloc_type;
137struct mtx;
138struct proc;
139struct socket;
140struct thread;
141struct tty;
142struct ucred;
143struct uio;
144struct _jmp_buf;
145struct trapframe;
146struct eventtimer;
147
148int setjmp(struct _jmp_buf *) __returns_twice;
149void longjmp(struct _jmp_buf *, int) __dead2;
150int dumpstatus(vm_offset_t addr, off_t count);
151int nullop(void);
152int eopnotsupp(void);
153int ureadc(int, struct uio *);
154void hashdestroy(void *, struct malloc_type *, u_long);
155void *hashinit(int count, struct malloc_type *type, u_long *hashmask);
156void *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
161void *phashinit(int count, struct malloc_type *type, u_long *nentries);
162void *phashinit_flags(int count, struct malloc_type *type, u_long *nentries,
163 int flags);
164
165void cpu_flush_dcache(void *, size_t);
166void cpu_rootconf(void);
167void critical_enter_KBI(void);
168void critical_exit_KBI(void);
169void critical_exit_preempt(void);
170void init_param1(void);
171void init_param2(long physpages);
172void init_static_kenv(char *, size_t);
173void tablefull(const char *);
174
175/*
176 * Allocate per-thread "current" state in the linuxkpi
177 */
178extern int (*lkpi_alloc_current)(struct thread *, int);
179int 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
185static __inline void
186critical_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
195static __inline void
196critical_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
213typedef void early_putc_t(int ch);
214extern early_putc_t *early_putc;
215#endif
216int kvprintf(char const *, void (*)(int, void*), void *, int,
217 __va_list) __printflike(1, 0);
218void log(int, const char *, ...) __printflike(2, 3);
219void log_console(struct uio *);
220void vlog(int, const char *, __va_list) __printflike(2, 0);
221int asprintf(char **ret, struct malloc_type *mtp, const char *format,
222 ...) __printflike(3, 4);
223int printf(const char *, ...) __printflike(1, 2);
224int snprintf(char *, size_t, const char *, ...) __printflike(3, 4);
225int sprintf(char *buf, const char *, ...) __printflike(2, 3);
226int uprintf(const char *, ...) __printflike(1, 2);
227int vprintf(const char *, __va_list) __printflike(1, 0);
228int vasprintf(char **ret, struct malloc_type *mtp, const char *format,
229 __va_list ap) __printflike(3, 0);
230int vsnprintf(char *, size_t, const char *, __va_list) __printflike(3, 0);
231int vsnrprintf(char *, size_t, int, const char *, __va_list) __printflike(4, 0);
232int vsprintf(char *buf, const char *, __va_list) __printflike(2, 0);
233int sscanf(const char *, char const * _Nonnull, ...) __scanflike(2, 3);
234int vsscanf(const char * _Nonnull, char const * _Nonnull, __va_list) __scanflike(2, 0);
235long strtol(const char *, char **, int);
236u_long strtoul(const char *, char **, int);
237quad_t strtoq(const char *, char **, int);
238u_quad_t strtouq(const char *, char **, int);
239void tprintf(struct proc *p, int pri, const char *, ...) __printflike(3, 4);
240void vtprintf(struct proc *, int, const char *, __va_list) __printflike(3, 0);
241void 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))
249void explicit_bzero(void * _Nonnull, size_t);
250
251void *memset(void * _Nonnull buf, int c, size_t len);
252void *memcpy(void * _Nonnull to, const void * _Nonnull from, size_t len);
253void *memmove(void * _Nonnull dest, const void * _Nonnull src, size_t n);
254int 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))
259void *SAN_INTERCEPTOR(memset)(void *, int, size_t);
260void *SAN_INTERCEPTOR(memcpy)(void *, const void *, size_t);
261void *SAN_INTERCEPTOR(memmove)(void *, const void *, size_t);
262int 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
282void *memset_early(void * _Nonnull buf, int c, size_t len);
283#define bzero_early(buf, len) memset_early((buf), 0, (len))
284void *memcpy_early(void * _Nonnull to, const void * _Nonnull from, size_t len);
285void *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
299int copyinstr(const void * __restrict udaddr,
300 void * _Nonnull __restrict kaddr, size_t len,
301 size_t * __restrict lencopied);
302int copyin(const void * __restrict udaddr,
303 void * _Nonnull __restrict kaddr, size_t len);
304int copyin_nofault(const void * __restrict udaddr,
305 void * _Nonnull __restrict kaddr, size_t len);
306int copyout(const void * _Nonnull __restrict kaddr,
307 void * __restrict udaddr, size_t len);
308int copyout_nofault(const void * _Nonnull __restrict kaddr,
309 void * __restrict udaddr, size_t len);
310
311#ifdef SAN_NEEDS_INTERCEPTORS
312int SAN_INTERCEPTOR(copyin)(const void *, void *, size_t);
313int SAN_INTERCEPTOR(copyinstr)(const void *, void *, size_t, size_t *);
314int 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
322int fubyte(volatile const void *base);
323long fuword(volatile const void *base);
324int fuword16(volatile const void *base);
325int32_t fuword32(volatile const void *base);
326int64_t fuword64(volatile const void *base);
327int fueword(volatile const void *base, long *val);
328int fueword32(volatile const void *base, int32_t *val);
329int fueword64(volatile const void *base, int64_t *val);
330int subyte(volatile void *base, int byte);
331int suword(volatile void *base, long word);
332int suword16(volatile void *base, int word);
333int suword32(volatile void *base, int32_t word);
334int suword64(volatile void *base, int64_t word);
335uint32_t casuword32(volatile uint32_t *base, uint32_t oldval, uint32_t newval);
336u_long casuword(volatile u_long *p, u_long oldval, u_long newval);
337int casueword32(volatile uint32_t *base, uint32_t oldval, uint32_t *oldvalp,
338 uint32_t newval);
339int casueword(volatile u_long *p, u_long oldval, u_long *oldvalp,
340 u_long newval);
341
342#if defined(SAN_NEEDS_INTERCEPTORS) && !defined(KCSAN)
343int SAN_INTERCEPTOR(fubyte)(volatile const void *base);
344int SAN_INTERCEPTOR(fuword16)(volatile const void *base);
345int SAN_INTERCEPTOR(fueword)(volatile const void *base, long *val);
346int SAN_INTERCEPTOR(fueword32)(volatile const void *base, int32_t *val);
347int SAN_INTERCEPTOR(fueword64)(volatile const void *base, int64_t *val);
348int SAN_INTERCEPTOR(subyte)(volatile void *base, int byte);
349int SAN_INTERCEPTOR(suword)(volatile void *base, long word);
350int SAN_INTERCEPTOR(suword16)(volatile void *base, int word);
351int SAN_INTERCEPTOR(suword32)(volatile void *base, int32_t word);
352int SAN_INTERCEPTOR(suword64)(volatile void *base, int64_t word);
353int SAN_INTERCEPTOR(casueword32)(volatile uint32_t *base, uint32_t oldval,
354 uint32_t *oldvalp, uint32_t newval);
355int 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
373int sysbeep(int hertz, sbintime_t duration);
374
375void hardclock(int cnt, int usermode);
376void hardclock_sync(int cpu);
377void statclock(int cnt, int usermode);
378void profclock(int cnt, int usermode, uintfptr_t pc);
379
380int hardclockintr(void);
381
382void startprofclock(struct proc *);
383void stopprofclock(struct proc *);
384void cpu_startprofclock(void);
385void cpu_stopprofclock(void);
386void suspendclock(void);
387void resumeclock(void);
388sbintime_t cpu_idleclock(void);
389void cpu_activeclock(void);
390void cpu_new_callout(int cpu, sbintime_t bt, sbintime_t bt_opt);
391void cpu_et_frequency(struct eventtimer *et, uint64_t newfreq);
392extern int cpu_disable_c2_sleep;
393extern int cpu_disable_c3_sleep;
394
395extern void (*tcp_hpts_softclock)(void);
396extern 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
403char *kern_getenv(const char *name);
404void freeenv(char *env);
405int getenv_int(const char *name, int *data);
406int getenv_uint(const char *name, unsigned int *data);
407int getenv_long(const char *name, long *data);
408int getenv_ulong(const char *name, unsigned long *data);
409int getenv_string(const char *name, char *data, int size);
410int getenv_int64(const char *name, int64_t *data);
411int getenv_uint64(const char *name, uint64_t *data);
412int getenv_quad(const char *name, quad_t *data);
413int getenv_bool(const char *name, bool *data);
414bool getenv_is_true(const char *name);
415bool getenv_is_false(const char *name);
416int kern_setenv(const char *name, const char *value);
417int kern_unsetenv(const char *name);
418int testenv(const char *name);
419
420int 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
425typedef uint64_t (cpu_tick_f)(void);
426void set_cputicker(cpu_tick_f *func, uint64_t freq, bool isvariable);
427extern cpu_tick_f *cpu_ticks;
428uint64_t cpu_tickrate(void);
429uint64_t cputick2usec(uint64_t tick);
430
431#include <sys/libkern.h>
432
433/* Initialize the world */
434void consinit(void);
435void cpu_initclocks(void);
436void cpu_initclocks_bsp(void);
437void cpu_initclocks_ap(void);
438void usrinfoinit(void);
439
440/* Finalize the world */
441void kern_reboot(int) __dead2;
442void shutdown_nice(int);
443
444/* Stubs for obsolete functions that used to be for interrupt management */
445static __inline intrmask_t splhigh(void) { return 0; }
446static __inline intrmask_t splimp(void) { return 0; }
447static __inline intrmask_t splnet(void) { return 0; }
448static __inline intrmask_t spltty(void) { return 0; }
449static __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 */
455int _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))
463int 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)
468int pause_sbt(const char *wmesg, sbintime_t sbt, sbintime_t pr,
469 int flags);
470static __inline int
471pause(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))
482void wakeup(const void *chan);
483void wakeup_one(const void *chan);
484void wakeup_any(const void *chan);
485
486/*
487 * Common `struct cdev *' stuff are declared here to avoid #include poisoning
488 */
489
490struct cdev;
491dev_t dev2udev(struct cdev *x);
492const char *devtoname(struct cdev *cdev);
493
494#ifdef __LP64__
495size_t devfs_iosize_max(void);
496size_t iosize_max(void);
497#endif
498
499int poll_no_poll(int events);
500
501/* XXX: Should be void nanodelay(u_int nsec); */
502void DELAY(int usec);
503
504int kcmp_cmp(uintptr_t a, uintptr_t b);
505
506/* Root mount holdback API */
507struct root_hold_token {
508 int flags;
509 const char *who;
510 TAILQ_ENTRY(root_hold_token) list;
511};
512
513struct root_hold_token *root_mount_hold(const char *identifier);
514void root_mount_hold_token(const char *identifier, struct root_hold_token *h);
515void root_mount_rel(struct root_hold_token *h);
516int root_mounted(void);
517
518/*
519 * Unit number allocation API. (kern/subr_unit.c)
520 */
521struct unrhdr;
522#define UNR_NO_MTX ((void *)(uintptr_t)-1)
523struct unrhdr *new_unrhdr(int low, int high, struct mtx *mutex);
524void init_unrhdr(struct unrhdr *uh, int low, int high, struct mtx *mutex);
525void delete_unrhdr(struct unrhdr *uh);
526void clear_unrhdr(struct unrhdr *uh);
527void clean_unrhdr(struct unrhdr *uh);
528void clean_unrhdrl(struct unrhdr *uh);
529int alloc_unr(struct unrhdr *uh);
530int alloc_unr_specific(struct unrhdr *uh, u_int item);
531int alloc_unrl(struct unrhdr *uh);
532void free_unr(struct unrhdr *uh, u_int item);
533void *create_iter_unr(struct unrhdr *uh);
534int next_iter_unr(void *handle);
535void free_iter_unr(void *handle);
536
537struct unrhdr64 {
538 uint64_t counter;
539};
540
541static __inline void
542new_unrhdr64(struct unrhdr64 *unr64, uint64_t low)
543{
544
545 unr64->counter = low;
546}
547
548static __inline uint64_t
549alloc_unr64(struct unrhdr64 *unr64)
550{
551
552 return (atomic_fetchadd_64(&unr64->counter, 1));
553}
554
555void intr_prof_stack_use(struct thread *td, struct trapframe *frame);
556
557void counted_warning(unsigned *counter, const char *msg);
558
559/*
560 * APIs to manage deprecation and obsolescence.
561 */
562void _gone_in(int major, const char *msg);
563void _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_ */