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
37#ifndef _SYS_SYSTM_H_
38#define _SYS_SYSTM_H_
39
40#include <sys/types.h>
41#include <sys/callout.h>
42#include <sys/kassert.h>
43#include <sys/queue.h>
44#include <sys/stdint.h> /* for people using printf mainly */
45#include <machine/atomic.h>
46#include <machine/cpufunc.h>
47
48__NULLABILITY_PRAGMA_PUSH
49
50#ifdef _KERNEL
51extern int cold; /* nonzero if we are doing a cold boot */
52extern int suspend_blocked; /* block suspend due to pending shutdown */
53extern int rebooting; /* kern_reboot() has been called. */
54extern const char version[]; /* system version */
55extern const char compiler_version[]; /* compiler version */
56extern const char copyright[]; /* system copyright */
57extern int kstack_pages; /* number of kernel stack pages */
58
59extern u_long pagesizes[]; /* supported page sizes */
60extern long physmem; /* physical memory */
61extern long realmem; /* 'real' memory */
62
63extern char *rootdevnames[2]; /* names of possible root devices */
64
65extern int boothowto; /* reboot flags, from console subsystem */
66extern int bootverbose; /* nonzero to print verbose messages */
67
68extern int maxusers; /* system tune hint */
69extern int ngroups_max; /* max # of supplemental groups */
70extern int vm_guest; /* Running as virtual machine guest? */
71
72extern u_long maxphys; /* max raw I/O transfer size */
73
74/*
75 * Detected virtual machine guest types. The intention is to expand
76 * and/or add to the VM_GUEST_VM type if specific VM functionality is
77 * ever implemented (e.g. vendor-specific paravirtualization features).
78 * Keep in sync with vm_guest_sysctl_names[].
79 */
80enum VM_GUEST { VM_GUEST_NO = 0, VM_GUEST_VM, VM_GUEST_XEN, VM_GUEST_HV,
81 VM_GUEST_VMWARE, VM_GUEST_KVM, VM_GUEST_BHYVE, VM_GUEST_VBOX,
82 VM_GUEST_PARALLELS, VM_GUEST_NVMM, VM_GUEST_LAST };
83
84#endif /* KERNEL */
85
86/*
87 * Align variables.
88 */
89#define __read_mostly __section(".data.read_mostly")
90#define __read_frequently __section(".data.read_frequently")
91#define __exclusive_cache_line __aligned(CACHE_LINE_SIZE) \
92 __section(".data.exclusive_cache_line")
93#if defined(_STANDALONE)
94struct ucred;
95#endif
96
97#ifdef _KERNEL
98#include <sys/param.h> /* MAXCPU */
99#include <sys/pcpu.h> /* curthread */
100#include <sys/kpilite.h>
101
102extern bool scheduler_stopped;
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() __predict_false(scheduler_stopped)
111
112extern const int osreldate;
113
114extern const void *zero_region; /* address space maps to a zeroed page */
115
116extern int unmapped_buf_allowed;
117
118#ifdef __LP64__
119#define IOSIZE_MAX iosize_max()
120#define DEVFS_IOSIZE_MAX devfs_iosize_max()
121#else
122#define IOSIZE_MAX SSIZE_MAX
123#define DEVFS_IOSIZE_MAX SSIZE_MAX
124#endif
125
126/*
127 * General function declarations.
128 */
129
130struct inpcb;
131struct lock_object;
132struct malloc_type;
133struct mtx;
134struct proc;
135struct socket;
136struct thread;
137struct tty;
138struct ucred;
139struct uio;
140struct _jmp_buf;
141struct trapframe;
142struct eventtimer;
143
144int setjmp(struct _jmp_buf *) __returns_twice;
145void longjmp(struct _jmp_buf *, int) __dead2;
146int dumpstatus(vm_offset_t addr, off_t count);
147int nullop(void);
148int eopnotsupp(void);
149int ureadc(int, struct uio *);
150void hashdestroy(void *, struct malloc_type *, u_long);
151void *hashinit(int count, struct malloc_type *type, u_long *hashmask);
152void *hashinit_flags(int count, struct malloc_type *type,
153 u_long *hashmask, int flags);
154#define HASH_NOWAIT 0x00000001
155#define HASH_WAITOK 0x00000002
156
157void *phashinit(int count, struct malloc_type *type, u_long *nentries);
158void *phashinit_flags(int count, struct malloc_type *type, u_long *nentries,
159 int flags);
160
161void cpu_flush_dcache(void *, size_t);
162void cpu_rootconf(void);
163void critical_enter_KBI(void);
164void critical_exit_KBI(void);
165void critical_exit_preempt(void);
166void init_param1(void);
167void init_param2(long physpages);
168void init_static_kenv(char *, size_t);
169void tablefull(const char *);
170
171/*
172 * Allocate per-thread "current" state in the linuxkpi
173 */
174extern int (*lkpi_alloc_current)(struct thread *, int);
175int linux_alloc_current_noop(struct thread *, int);
176
177#if (defined(KLD_MODULE) && !defined(KLD_TIED)) || defined(KTR_CRITICAL) || !defined(_KERNEL) || defined(GENOFFSET)
178#define critical_enter() critical_enter_KBI()
179#define critical_exit() critical_exit_KBI()
180#else
181static __inline void
182critical_enter(void)
183{
184 struct thread_lite *td;
185
186 td = (struct thread_lite *)curthread;
187 td->td_critnest++;
188 atomic_interrupt_fence();
189}
190
191static __inline void
192critical_exit(void)
193{
194 struct thread_lite *td;
195
196 td = (struct thread_lite *)curthread;
197 KASSERT(td->td_critnest != 0,
198 ("critical_exit: td_critnest == 0"));
199 atomic_interrupt_fence();
200 td->td_critnest--;
201 atomic_interrupt_fence();
202 if (__predict_false(td->td_owepreempt))
203 critical_exit_preempt();
204
205}
206#endif
207
208#ifdef EARLY_PRINTF
209typedef void early_putc_t(int ch);
210extern early_putc_t *early_putc;
211#define CHECK_EARLY_PRINTF(x) \
212 __CONCAT(early_printf_, EARLY_PRINTF) == __CONCAT(early_printf_, x)
213#define early_printf_1 1
214#define early_printf_mvebu 2
215#define early_printf_ns8250 3
216#define early_printf_pl011 4
217#define early_printf_snps 5
218#define early_printf_sbi 6
219#else
220#define CHECK_EARLY_PRINTF(x) 0
221#endif
222int kvprintf(char const *, void (*)(int, void*), void *, int,
223 __va_list) __printflike(1, 0);
224void log(int, const char *, ...) __printflike(2, 3);
225void log_console(struct uio *);
226void vlog(int, const char *, __va_list) __printflike(2, 0);
227int asprintf(char **ret, struct malloc_type *mtp, const char *format,
228 ...) __printflike(3, 4);
229int printf(const char *, ...) __printflike(1, 2);
230int snprintf(char *, size_t, const char *, ...) __printflike(3, 4);
231int sprintf(char *buf, const char *, ...) __printflike(2, 3);
232int uprintf(const char *, ...) __printflike(1, 2);
233int vprintf(const char *, __va_list) __printflike(1, 0);
234int vasprintf(char **ret, struct malloc_type *mtp, const char *format,
235 __va_list ap) __printflike(3, 0);
236int vsnprintf(char *, size_t, const char *, __va_list) __printflike(3, 0);
237int vsnrprintf(char *, size_t, int, const char *, __va_list) __printflike(4, 0);
238int vsprintf(char *buf, const char *, __va_list) __printflike(2, 0);
239int sscanf(const char *, char const * _Nonnull, ...) __scanflike(2, 3);
240int vsscanf(const char * _Nonnull, char const * _Nonnull, __va_list) __scanflike(2, 0);
241long strtol(const char *, char **, int);
242u_long strtoul(const char *, char **, int);
243quad_t strtoq(const char *, char **, int);
244u_quad_t strtouq(const char *, char **, int);
245void tprintf(struct proc *p, int pri, const char *, ...) __printflike(3, 4);
246void vtprintf(struct proc *, int, const char *, __va_list) __printflike(3, 0);
247void hexdump(const void *ptr, int length, const char *hdr, int flags);
248#define HD_COLUMN_MASK 0xff
249#define HD_DELIM_MASK 0xff00
250#define HD_OMIT_COUNT (1 << 16)
251#define HD_OMIT_HEX (1 << 17)
252#define HD_OMIT_CHARS (1 << 18)
253
254#define ovbcopy(f, t, l) bcopy((f), (t), (l))
255void explicit_bzero(void * _Nonnull, size_t);
256
257void *memset(void * _Nonnull buf, int c, size_t len);
258void *memcpy(void * _Nonnull to, const void * _Nonnull from, size_t len);
259void *memmove(void * _Nonnull dest, const void * _Nonnull src, size_t n);
260int memcmp(const void *b1, const void *b2, size_t len);
261
262#ifdef SAN_NEEDS_INTERCEPTORS
263#define SAN_INTERCEPTOR(func) \
264 __CONCAT(SAN_INTERCEPTOR_PREFIX, __CONCAT(_, func))
265void *SAN_INTERCEPTOR(memset)(void *, int, size_t);
266void *SAN_INTERCEPTOR(memcpy)(void *, const void *, size_t);
267void *SAN_INTERCEPTOR(memmove)(void *, const void *, size_t);
268int SAN_INTERCEPTOR(memcmp)(const void *, const void *, size_t);
269#ifndef SAN_RUNTIME
270#define bcopy(from, to, len) SAN_INTERCEPTOR(memmove)((to), (from), (len))
271#define bzero(buf, len) SAN_INTERCEPTOR(memset)((buf), 0, (len))
272#define bcmp(b1, b2, len) SAN_INTERCEPTOR(memcmp)((b1), (b2), (len))
273#define memset(buf, c, len) SAN_INTERCEPTOR(memset)((buf), (c), (len))
274#define memcpy(to, from, len) SAN_INTERCEPTOR(memcpy)((to), (from), (len))
275#define memmove(dest, src, n) SAN_INTERCEPTOR(memmove)((dest), (src), (n))
276#define memcmp(b1, b2, len) SAN_INTERCEPTOR(memcmp)((b1), (b2), (len))
277#endif /* !SAN_RUNTIME */
278#else /* !SAN_NEEDS_INTERCEPTORS */
279#define bcopy(from, to, len) __builtin_memmove((to), (from), (len))
280#define bzero(buf, len) __builtin_memset((buf), 0, (len))
281#define bcmp(b1, b2, len) __builtin_memcmp((b1), (b2), (len))
282#define memset(buf, c, len) __builtin_memset((buf), (c), (len))
283#define memcpy(to, from, len) __builtin_memcpy((to), (from), (len))
284#define memmove(dest, src, n) __builtin_memmove((dest), (src), (n))
285#define memcmp(b1, b2, len) __builtin_memcmp((b1), (b2), (len))
286#endif /* SAN_NEEDS_INTERCEPTORS */
287
288void *memset_early(void * _Nonnull buf, int c, size_t len);
289#define bzero_early(buf, len) memset_early((buf), 0, (len))
290void *memcpy_early(void * _Nonnull to, const void * _Nonnull from, size_t len);
291void *memmove_early(void * _Nonnull dest, const void * _Nonnull src, size_t n);
292#define bcopy_early(from, to, len) memmove_early((to), (from), (len))
293
294#define copystr(src, dst, len, outlen) ({ \
295 size_t __r, __len, *__outlen; \
296 \
297 __len = (len); \
298 __outlen = (outlen); \
299 __r = strlcpy((dst), (src), __len); \
300 if (__outlen != NULL) \
301 *__outlen = ((__r >= __len) ? __len : __r + 1); \
302 ((__r >= __len) ? ENAMETOOLONG : 0); \
303})
304
305int __result_use_check copyinstr(const void * __restrict udaddr,
306 void * _Nonnull __restrict kaddr, size_t len,
307 size_t * __restrict lencopied);
308int __result_use_check copyin(const void * __restrict udaddr,
309 void * _Nonnull __restrict kaddr, size_t len);
310int __result_use_check copyin_nofault(const void * __restrict udaddr,
311 void * _Nonnull __restrict kaddr, size_t len);
312__nodiscard int copyout(const void * _Nonnull __restrict kaddr,
313 void * __restrict udaddr, size_t len);
314__nodiscard int copyout_nofault(
315 const void * _Nonnull __restrict kaddr, void * __restrict udaddr,
316 size_t len);
317
318#ifdef SAN_NEEDS_INTERCEPTORS
319int SAN_INTERCEPTOR(copyin)(const void *, void *, size_t);
320int SAN_INTERCEPTOR(copyinstr)(const void *, void *, size_t, size_t *);
321int SAN_INTERCEPTOR(copyout)(const void *, void *, size_t);
322#ifndef SAN_RUNTIME
323#define copyin(u, k, l) SAN_INTERCEPTOR(copyin)((u), (k), (l))
324#define copyinstr(u, k, l, lc) SAN_INTERCEPTOR(copyinstr)((u), (k), (l), (lc))
325#define copyout(k, u, l) SAN_INTERCEPTOR(copyout)((k), (u), (l))
326#endif /* !SAN_RUNTIME */
327#endif /* SAN_NEEDS_INTERCEPTORS */
328
329int fubyte(volatile const void *base);
330long fuword(volatile const void *base);
331int fuword16(volatile const void *base);
332int32_t fuword32(volatile const void *base);
333int64_t fuword64(volatile const void *base);
334int __result_use_check fueword(volatile const void *base, long *val);
335int __result_use_check fueword32(volatile const void *base, int32_t *val);
336int __result_use_check fueword64(volatile const void *base, int64_t *val);
337__nodiscard int subyte(volatile void *base, int byte);
338__nodiscard int suword(volatile void *base, long word);
339__nodiscard int suword16(volatile void *base, int word);
340__nodiscard int suword32(volatile void *base, int32_t word);
341__nodiscard int suword64(volatile void *base, int64_t word);
342uint32_t casuword32(volatile uint32_t *base, uint32_t oldval, uint32_t newval);
343u_long casuword(volatile u_long *p, u_long oldval, u_long newval);
344int casueword32(volatile uint32_t *base, uint32_t oldval, uint32_t *oldvalp,
345 uint32_t newval);
346int casueword(volatile u_long *p, u_long oldval, u_long *oldvalp,
347 u_long newval);
348
349#if defined(SAN_NEEDS_INTERCEPTORS) && !defined(KCSAN)
350int SAN_INTERCEPTOR(fubyte)(volatile const void *base);
351int SAN_INTERCEPTOR(fuword16)(volatile const void *base);
352int SAN_INTERCEPTOR(fueword)(volatile const void *base, long *val);
353int SAN_INTERCEPTOR(fueword32)(volatile const void *base, int32_t *val);
354int SAN_INTERCEPTOR(fueword64)(volatile const void *base, int64_t *val);
355int SAN_INTERCEPTOR(subyte)(volatile void *base, int byte);
356int SAN_INTERCEPTOR(suword)(volatile void *base, long word);
357int SAN_INTERCEPTOR(suword16)(volatile void *base, int word);
358int SAN_INTERCEPTOR(suword32)(volatile void *base, int32_t word);
359int SAN_INTERCEPTOR(suword64)(volatile void *base, int64_t word);
360int SAN_INTERCEPTOR(casueword32)(volatile uint32_t *base, uint32_t oldval,
361 uint32_t *oldvalp, uint32_t newval);
362int SAN_INTERCEPTOR(casueword)(volatile u_long *p, u_long oldval,
363 u_long *oldvalp, u_long newval);
364#ifndef SAN_RUNTIME
365#define fubyte(b) SAN_INTERCEPTOR(fubyte)((b))
366#define fuword16(b) SAN_INTERCEPTOR(fuword16)((b))
367#define fueword(b, v) SAN_INTERCEPTOR(fueword)((b), (v))
368#define fueword32(b, v) SAN_INTERCEPTOR(fueword32)((b), (v))
369#define fueword64(b, v) SAN_INTERCEPTOR(fueword64)((b), (v))
370#define subyte(b, w) SAN_INTERCEPTOR(subyte)((b), (w))
371#define suword(b, w) SAN_INTERCEPTOR(suword)((b), (w))
372#define suword16(b, w) SAN_INTERCEPTOR(suword16)((b), (w))
373#define suword32(b, w) SAN_INTERCEPTOR(suword32)((b), (w))
374#define suword64(b, w) SAN_INTERCEPTOR(suword64)((b), (w))
375#define casueword32(b, o, p, n) SAN_INTERCEPTOR(casueword32)((b), (o), (p), (n))
376#define casueword(b, o, p, n) SAN_INTERCEPTOR(casueword)((b), (o), (p), (n))
377#endif /* !SAN_RUNTIME */
378#endif /* SAN_NEEDS_INTERCEPTORS && !KCSAN */
379
380int sysbeep(int hertz, sbintime_t duration);
381
382void hardclock(int cnt, int usermode);
383void hardclock_sync(int cpu);
384void statclock(int cnt, int usermode);
385void profclock(int cnt, int usermode, uintfptr_t pc);
386
387int hardclockintr(void);
388
389void startprofclock(struct proc *);
390void stopprofclock(struct proc *);
391void cpu_startprofclock(void);
392void cpu_stopprofclock(void);
393void suspendclock(void);
394void resumeclock(void);
395sbintime_t cpu_idleclock(void);
396void cpu_activeclock(void);
397void cpu_new_callout(int cpu, sbintime_t bt, sbintime_t bt_opt);
398void cpu_et_frequency(struct eventtimer *et, uint64_t newfreq);
399extern int cpu_disable_c2_sleep;
400extern int cpu_disable_c3_sleep;
401
402extern void (*tcp_hpts_softclock)(void);
403extern volatile uint32_t __read_frequently hpts_that_need_softclock;
404
405#define tcp_hpts_softclock() do { \
406 if (hpts_that_need_softclock > 0) \
407 tcp_hpts_softclock(); \
408} while (0)
409
410char *kern_getenv(const char *name);
411void freeenv(char *env);
412int getenv_int(const char *name, int *data);
413int getenv_uint(const char *name, unsigned int *data);
414int getenv_long(const char *name, long *data);
415int getenv_ulong(const char *name, unsigned long *data);
416int getenv_string(const char *name, char *data, int size);
417int getenv_int64(const char *name, int64_t *data);
418int getenv_uint64(const char *name, uint64_t *data);
419int getenv_quad(const char *name, quad_t *data);
420int getenv_bool(const char *name, bool *data);
421bool getenv_is_true(const char *name);
422bool getenv_is_false(const char *name);
423int kern_setenv(const char *name, const char *value);
424int kern_unsetenv(const char *name);
425int testenv(const char *name);
426
427int getenv_array(const char *name, void *data, int size, int *psize,
428 int type_size, bool allow_signed);
429#define GETENV_UNSIGNED false /* negative numbers not allowed */
430#define GETENV_SIGNED true /* negative numbers allowed */
431
432typedef uint64_t (cpu_tick_f)(void);
433void set_cputicker(cpu_tick_f *func, uint64_t freq, bool isvariable);
434extern cpu_tick_f *cpu_ticks;
435uint64_t cpu_tickrate(void);
436uint64_t cputick2usec(uint64_t tick);
437
438#include <sys/libkern.h>
439
440/* Initialize the world */
441void consinit(void);
442void cpu_initclocks(void);
443void cpu_initclocks_bsp(void);
444void cpu_initclocks_ap(void);
445void usrinfoinit(void);
446
447/* Finalize the world */
448void kern_reboot(int) __dead2;
449void shutdown_nice(int);
450
451/* Stubs for obsolete functions that used to be for interrupt management */
452static __inline intrmask_t splhigh(void) { return 0; }
453static __inline intrmask_t splimp(void) { return 0; }
454static __inline intrmask_t splnet(void) { return 0; }
455static __inline intrmask_t spltty(void) { return 0; }
456static __inline void splx(intrmask_t ipl __unused) { return; }
457
458/*
459 * Common `proc' functions are declared here so that proc.h can be included
460 * less often.
461 */
462int _sleep(const void * _Nonnull chan, struct lock_object *lock, int pri,
463 const char *wmesg, sbintime_t sbt, sbintime_t pr, int flags);
464#define msleep(chan, mtx, pri, wmesg, timo) \
465 _sleep((chan), &(mtx)->lock_object, (pri), (wmesg), \
466 tick_sbt * (timo), 0, C_HARDCLOCK)
467#define msleep_sbt(chan, mtx, pri, wmesg, bt, pr, flags) \
468 _sleep((chan), &(mtx)->lock_object, (pri), (wmesg), (bt), (pr), \
469 (flags))
470int msleep_spin_sbt(const void * _Nonnull chan, struct mtx *mtx,
471 const char *wmesg, sbintime_t sbt, sbintime_t pr, int flags);
472#define msleep_spin(chan, mtx, wmesg, timo) \
473 msleep_spin_sbt((chan), (mtx), (wmesg), tick_sbt * (timo), \
474 0, C_HARDCLOCK)
475int pause_sbt(const char *wmesg, sbintime_t sbt, sbintime_t pr,
476 int flags);
477static __inline int
478pause(const char *wmesg, int timo)
479{
480 return (pause_sbt(wmesg, tick_sbt * timo, 0, C_HARDCLOCK));
481}
482#define pause_sig(wmesg, timo) \
483 pause_sbt((wmesg), tick_sbt * (timo), 0, C_HARDCLOCK | C_CATCH)
484#define tsleep(chan, pri, wmesg, timo) \
485 _sleep((chan), NULL, (pri), (wmesg), tick_sbt * (timo), \
486 0, C_HARDCLOCK)
487#define tsleep_sbt(chan, pri, wmesg, bt, pr, flags) \
488 _sleep((chan), NULL, (pri), (wmesg), (bt), (pr), (flags))
489void wakeup(const void *chan);
490void wakeup_one(const void *chan);
491void wakeup_any(const void *chan);
492
493/*
494 * Common `struct cdev *' stuff are declared here to avoid #include poisoning
495 */
496
497struct cdev;
498dev_t dev2udev(struct cdev *x);
499const char *devtoname(struct cdev *cdev);
500
501#ifdef __LP64__
502size_t devfs_iosize_max(void);
503size_t iosize_max(void);
504#endif
505
506int poll_no_poll(int events);
507
508/* XXX: Should be void nanodelay(u_int nsec); */
509void DELAY(int usec);
510
511int kcmp_cmp(uintptr_t a, uintptr_t b);
512
513/* Root mount holdback API */
514struct root_hold_token {
515 int flags;
516 const char *who;
517 TAILQ_ENTRY(root_hold_token) list;
518};
519
520struct root_hold_token *root_mount_hold(const char *identifier);
521void root_mount_hold_token(const char *identifier, struct root_hold_token *h);
522void root_mount_rel(struct root_hold_token *h);
523int root_mounted(void);
524
525/*
526 * Unit number allocation API. (kern/subr_unit.c)
527 */
528struct unrhdr;
529#define UNR_NO_MTX ((void *)(uintptr_t)-1)
530struct unrhdr *new_unrhdr(int low, int high, struct mtx *mutex);
531void init_unrhdr(struct unrhdr *uh, int low, int high, struct mtx *mutex);
532void delete_unrhdr(struct unrhdr *uh);
533void clear_unrhdr(struct unrhdr *uh);
534void clean_unrhdr(struct unrhdr *uh);
535void clean_unrhdrl(struct unrhdr *uh);
536int alloc_unr(struct unrhdr *uh);
537int alloc_unr_specific(struct unrhdr *uh, u_int item);
538int alloc_unrl(struct unrhdr *uh);
539void free_unr(struct unrhdr *uh, u_int item);
540void *create_iter_unr(struct unrhdr *uh);
541int next_iter_unr(void *handle);
542void free_iter_unr(void *handle);
543
544struct unrhdr64 {
545 uint64_t counter;
546};
547
548static __inline void
549new_unrhdr64(struct unrhdr64 *unr64, uint64_t low)
550{
551
552 unr64->counter = low;
553}
554
555static __inline uint64_t
556alloc_unr64(struct unrhdr64 *unr64)
557{
558
559 return (atomic_fetchadd_64(&unr64->counter, 1));
560}
561
562void intr_prof_stack_use(struct thread *td, struct trapframe *frame);
563
564void counted_warning(unsigned *counter, const char *msg);
565
566/*
567 * APIs to manage deprecation and obsolescence.
568 */
569void _gone_in(int major, const char *msg, ...) __printflike(2, 3);
570void _gone_in_dev(device_t dev, int major, const char *msg, ...)
571 __printflike(3, 4);
572#ifdef NO_OBSOLETE_CODE
573#define __gone_ok(m, msg) \
574 _Static_assert(m < P_OSREL_MAJOR(__FreeBSD_version)), \
575 "Obsolete code: " msg)
576#else
577#define __gone_ok(m, msg)
578#endif
579#define gone_in(major, msg, ...) do { \
580 static bool __read_mostly __gone_in_ ## __LINE__ = true; \
581 __gone_ok(major, msg); \
582 if (__predict_false(__gone_in_ ## __LINE__)) { \
583 __gone_in_ ## __LINE__ = false; \
584 _gone_in(major, msg __VA_OPT__(,) __VA_ARGS__); \
585 } \
586} while (0)
587#define gone_in_dev(dev, major, msg, ...) do { \
588 static bool __read_mostly __gone_in_ ## __LINE__ = true; \
589 __gone_ok(major, msg); \
590 if (__predict_false(__gone_in_ ## __LINE__)) { \
591 __gone_in_ ## __LINE__ = false; \
592 _gone_in_dev(dev, major, msg __VA_OPT__(,) __VA_ARGS__);\
593 } \
594} while (0)
595
596#ifdef INVARIANTS
597#define __diagused
598#else
599#define __diagused __unused
600#endif
601
602#ifdef WITNESS
603#define __witness_used
604#else
605#define __witness_used __unused
606#endif
607
608#endif /* _KERNEL */
609
610__NULLABILITY_PRAGMA_POP
611#endif /* !_SYS_SYSTM_H_ */