A virtual kernel can cause a vm_page's hold_count to exceed 32768. Make
[dragonfly.git] / sys / sys / systm.h
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1/*-
2 * Copyright (c) 1982, 1988, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * @(#)systm.h 8.7 (Berkeley) 3/29/95
39 * $FreeBSD: src/sys/sys/systm.h,v 1.111.2.18 2002/12/17 18:04:02 sam Exp $
b402c633 40 * $DragonFly: src/sys/sys/systm.h,v 1.72 2007/07/02 01:37:11 dillon Exp $
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41 */
42
43#ifndef _SYS_SYSTM_H_
44#define _SYS_SYSTM_H_
45
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46#ifndef _KERNEL
47#error "This file should not be included by userland programs."
03d6a592 48#else
d9f3f6fa 49
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50#ifndef _MACHINE_TYPES_H_
51#include <machine/types.h>
52#endif
53#ifndef _MACHINE_STDARG_H_
54#include <machine/stdarg.h>
55#endif
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56#include <machine/atomic.h>
57#include <machine/cpufunc.h>
58#include <sys/callout.h>
59
60extern int securelevel; /* system security level (see init(8)) */
7e42c007 61extern int kernel_mem_readonly; /* disable writes to kernel memory */
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62
63extern int cold; /* nonzero if we are doing a cold boot */
dbcd0c9b 64extern int tsleep_now_works; /* tsleep won't just return any more */
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65extern const char *panicstr; /* panic message */
66extern int dumping; /* system is dumping */
67extern int safepri; /* safe ipl when cold or panicing */
68extern char version[]; /* system version */
69extern char copyright[]; /* system copyright */
70
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71extern int selwait; /* select timeout address */
72
73extern u_char curpriority; /* priority of current process */
74
75extern int physmem; /* physical memory */
76
b13267a5 77extern cdev_t dumpdev; /* dump device */
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78extern int dumplo; /* OBSOLETE */
79extern u_int64_t dumplo64; /* block number into dumpdev, start of dump */
984263bc 80
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81extern cdev_t rootdev; /* root device */
82extern cdev_t rootdevs[2]; /* possible root devices */
984263bc 83extern char *rootdevnames[2]; /* names of possible root devices */
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84
85extern int boothowto; /* reboot flags, from console subsystem */
86extern int bootverbose; /* nonzero to print verbose messages */
87
88extern int maxusers; /* system tune hint */
89
17a9f566 90extern int ncpus; /* total number of cpus (real, hyper, virtual)*/
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91extern int ncpus2; /* ncpus rounded down to power of 2 */
92extern int ncpus2_shift; /* log base 2 of ncpus2 */
93extern int ncpus2_mask; /* ncpus2 - 1 */
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94extern int ncpus_fit; /* round up to a power of 2 */
95extern int ncpus_fit_mask; /* ncpus_fit - 1 */
da3639ef 96extern int clocks_running; /* timing/timeout subsystem is operational */
17a9f566 97
97ee3efc 98/* XXX TGEN these don't belong here, they're MD on i386/amd64 */
527fddf7 99extern u_int cpu_feature; /* CPUID_* features */
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100extern u_int cpu_feature2; /* CPUID2_* features */
101
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102extern int nfs_diskless_valid; /* NFS diskless params were obtained */
103extern vm_paddr_t Maxmem; /* Highest physical memory address in system */
527fddf7 104
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105#ifdef INVARIANTS /* The option is always available */
106#define KASSERT(exp,msg) do { if (!(exp)) panic msg; } while (0)
5ee2acaa 107#define KKASSERT(exp) if (!(exp)) panic("assertion: %s in %s", #exp, __func__)
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108#else
109#define KASSERT(exp,msg)
41c20dac 110#define KKASSERT(exp)
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111#endif
112
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113#define CTASSERT(x) _CTASSERT(x, __LINE__)
114#define _CTASSERT(x, y) __CTASSERT(x, y)
115#define __CTASSERT(x, y) typedef char __assert ## y[(x) ? 1 : -1]
116
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117/*
118 * General function declarations.
119 */
120
88c4d2f6 121struct intrframe;
bf765287 122struct spinlock;
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123struct malloc_type;
124struct proc;
f1d1c3fa 125struct xwait;
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126struct timeval;
127struct tty;
128struct uio;
8ad65e08 129struct globaldata;
41c20dac 130struct thread;
4a22e893 131struct trapframe;
6bf59cd2 132struct user;
135d7199 133struct vmspace;
4e7c41c5 134struct savetls;
984263bc 135
b153f746 136void Debugger (const char *msg);
801f17b9 137void backtrace(void);
b153f746 138void mi_gdinit (struct globaldata *gd, int cpu);
6bf59cd2 139void mi_proc0init(struct globaldata *gd, struct user *proc0paddr);
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140int dumpstatus (vm_offset_t addr, off_t count);
141int nullop (void);
b13267a5 142int seltrue (cdev_t dev, int which);
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143int ureadc (int, struct uio *);
144void *hashinit (int count, struct malloc_type *type, u_long *hashmask);
145void *phashinit (int count, struct malloc_type *type, u_long *nentries);
146
4a22e893 147int cpu_sanitize_frame (struct trapframe *);
4e7c41c5 148int cpu_sanitize_tls (struct savetls *);
b402c633 149void cpu_mplock_contested(void);
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150void cpu_halt (void);
151void cpu_reset (void);
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152void cpu_boot (int);
153void cpu_rootconf (void);
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154void cpu_vmspace_alloc(struct vmspace *);
155void cpu_vmspace_free(struct vmspace *);
4e7c41c5 156void set_user_TLS(void);
431d0fef 157void set_vkernel_fp(struct trapframe *);
460426e6 158int kvm_access_check(vm_offset_t, vm_offset_t, int);
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159
160vm_paddr_t kvtop(void *addr);
161int is_physical_memory (vm_offset_t addr);
162
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163extern uint32_t crc32_tab[];
164uint32_t crc32(const void *buf, size_t size);
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165void init_param1 (void);
166void init_param2 (int physpages);
167void tablefull (const char *);
379210cb 168int kvcprintf (char const *, void (*)(int, void*), void *, int,
e2565a42 169 __va_list) __printflike(1, 0);
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170int log (int, const char *, ...) __printflike(2, 3);
171void logwakeup (void);
172void log_console (struct uio *);
169276ba 173int kprintf (const char *, ...) __printflike(1, 2);
169276ba 174int ksnprintf (char *, size_t, const char *, ...) __printflike(3, 4);
169276ba 175int ksprintf (char *buf, const char *, ...) __printflike(2, 3);
b153f746 176int uprintf (const char *, ...) __printflike(1, 2);
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177int kvprintf (const char *, __va_list) __printflike(1, 0);
178int kvsnprintf (char *, size_t, const char *, __va_list) __printflike(3, 0);
179int kvsprintf (char *buf, const char *, __va_list) __printflike(2, 0);
b153f746 180int ttyprintf (struct tty *, const char *, ...) __printflike(2, 3);
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181int ksscanf (const char *, char const *, ...);
182int kvsscanf (const char *, char const *, __va_list);
44a09dd6 183
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184long strtol (const char *, char **, int);
185u_long strtoul (const char *, char **, int);
186quad_t strtoq (const char *, char **, int);
187u_quad_t strtouq (const char *, char **, int);
984263bc 188
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189/*
190 * note: some functions commonly used by device drivers may be passed
191 * pointers to volatile storage, volatile set to avoid warnings.
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192 *
193 * NOTE: bcopyb() - is a dumb byte-granular bcopy. This routine is
194 * explicitly not meant to be sophisticated.
195 * NOTE: bcopyi() - is a dumb int-granular bcopy (len is still in bytes).
196 * This routine is explicitly not meant to be sophisticated.
f15db79e 197 */
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198void bcopyb (const void *from, void *to, size_t len);
199void bcopyi (const void *from, void *to, size_t len);
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200void bcopy (volatile const void *from, volatile void *to, size_t len);
201void ovbcopy (const void *from, void *to, size_t len);
afaa1d56 202void bzero (volatile void *buf, size_t len);
b153f746 203void *memcpy (void *to, const void *from, size_t len);
984263bc 204
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205int copystr (const void *kfaddr, void *kdaddr, size_t len,
206 size_t *lencopied);
207int copyinstr (const void *udaddr, void *kaddr, size_t len,
208 size_t *lencopied);
209int copyin (const void *udaddr, void *kaddr, size_t len);
210int copyout (const void *kaddr, void *udaddr, size_t len);
984263bc 211
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212int fubyte (const void *base);
213int subyte (void *base, int byte);
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214long fuword (const void *base);
215int suword (void *base, long word);
216int fusword (void *base);
217int susword (void *base, int word);
984263bc 218
b153f746 219void realitexpire (void *);
f0f0df1c 220void DELAY(int usec);
dbcd0c9b 221void DRIVERSLEEP(int usec);
984263bc 222
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223void startprofclock (struct proc *);
224void stopprofclock (struct proc *);
225void setstatclockrate (int hzrate);
984263bc 226
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227/*
228 * Console I/O spinlocks - these typically also hard-disable interrupts
229 * for the duration.
230 */
231void cons_lock(void);
232void cons_unlock(void);
233
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234/*
235 * Kernel environment support functions and sundry.
236 */
bc01a404 237char *kgetenv (const char *name);
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238int ksetenv(const char *name, const char *value);
239int kunsetenv(const char *name);
240void kfreeenv(char *env);
241int ktestenv(const char *name);
242/* XXX TGEN Get rid of these compat defines. */
243#define testenv ktestenv
244#define freeenv kfreeenv
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245int kgetenv_int (const char *name, int *data);
246int kgetenv_string (const char *name, char *data, int size);
247int kgetenv_quad (const char *name, quad_t *data);
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248extern char *kern_envp;
249
250#ifdef APM_FIXUP_CALLTODO
b153f746 251void adjust_timeout_calltodo (struct timeval *time_change);
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252#endif /* APM_FIXUP_CALLTODO */
253
254#include <sys/libkern.h>
255
256/* Initialize the world */
a8a86718 257void mi_startup (void);
b153f746 258void consinit (void);
ba39e2e0 259void cpu_initclocks (void *arg __unused);
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260void nchinit (void);
261void usrinfoinit (void);
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262
263/* Finalize the world. */
b153f746 264void shutdown_nice (int);
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265
266/*
267 * Kernel to clock driver interface.
268 */
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269void inittodr (time_t base);
270void resettodr (void);
271void startrtclock (void);
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272
273/* Timeouts */
b153f746 274typedef void timeout_t (void *); /* timeout function type */
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275#define CALLOUT_HANDLE_INITIALIZER(handle) \
276 { NULL }
277
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278#if 0
279/* OBSOLETE INTERFACE */
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280void callout_handle_init (struct callout_handle *);
281struct callout_handle timeout (timeout_t *, void *, int);
282void untimeout (timeout_t *, void *, struct callout_handle);
7eb3b2ae 283#endif
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284
285/* Interrupt management */
286
287/*
288 * For the alpha arch, some of these functions are static __inline, and
289 * the others should be.
290 */
291#ifdef __i386__
b153f746 292void setdelayed (void);
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293void setsoftcambio (void);
294void setsoftcamnet (void);
0fb6ec96 295void setsoftunused02 (void);
b153f746 296void setsoftcrypto (void);
0fb6ec96 297void setsoftunused01 (void);
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298void setsofttty (void);
299void setsoftvm (void);
300void setsofttq (void);
b153f746 301void schedsofttty (void);
b153f746 302void splz (void);
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303#endif /* __i386__ */
304
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305/*
306 * Various callout lists.
307 */
308
309/* Exit callout list declarations. */
b153f746 310typedef void (*exitlist_fn) (struct thread *td);
984263bc 311
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312int at_exit (exitlist_fn function);
313int rm_at_exit (exitlist_fn function);
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314
315/* Fork callout list declarations. */
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316typedef void (*forklist_fn) (struct proc *parent, struct proc *child,
317 int flags);
984263bc 318
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319int at_fork (forklist_fn function);
320int rm_at_fork (forklist_fn function);
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321
322/*
323 * Not exactly a callout LIST, but a callout entry.
324 * Allow an external module to define a hardware watchdog tickler.
325 * Normally a process would do this, but there are times when the
326 * kernel needs to be able to hold off the watchdog, when the process
327 * is not active, e.g., when dumping core.
328 */
b153f746 329typedef void (*watchdog_tickle_fn) (void);
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330
331extern watchdog_tickle_fn wdog_tickler;
332
333/*
334 * Common `proc' functions are declared here so that proc.h can be included
335 * less often.
336 */
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337int tsleep (void *, int, const char *, int);
338int msleep (void *, struct spinlock *, int, const char *, int);
16523a43 339void tsleep_interlock (void *chan);
a22c590e 340int lwkt_sleep (const char *, int);
9a379a4a 341void tstop (void);
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342void wakeup (void *chan);
343void wakeup_one (void *chan);
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344void wakeup_mycpu (void *chan);
345void wakeup_mycpu_one (void *chan);
346void wakeup_oncpu (struct globaldata *gd, void *chan);
347void wakeup_oncpu_one (struct globaldata *gd, void *chan);
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348void wakeup_domain (void *chan, int domain);
349void wakeup_domain_one (void *chan, int domain);
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350
351/*
b13267a5 352 * Common `cdev_t' stuff are declared here to avoid #include poisoning
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353 */
354
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355int major(cdev_t x);
356int minor(cdev_t x);
357udev_t dev2udev(cdev_t x);
358cdev_t udev2dev(udev_t x, int b);
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359int uminor(udev_t dev);
360int umajor(udev_t dev);
361udev_t makeudev(int x, int y);
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362
363#endif /* _KERNEL */
984263bc 364#endif /* !_SYS_SYSTM_H_ */