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.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * @(#)systm.h 8.7 (Berkeley) 3/29/95
41 #include <machine/atomic.h>
42 #include <machine/cpufunc.h>
43 #include <sys/callout.h>
44 #include <sys/cdefs.h>
45 #include <sys/queue.h>
46 #include <sys/stdint.h> /* for people using printf mainly */
48 extern int securelevel; /* system security level (see init(8)) */
50 extern int cold; /* nonzero if we are doing a cold boot */
51 extern int rebooting; /* boot() has been called. */
52 extern const char *panicstr; /* panic message */
53 extern char version[]; /* system version */
54 extern char copyright[]; /* system copyright */
55 extern int kstack_pages; /* number of kernel stack pages */
57 extern int nswap; /* size of swap space */
59 extern long physmem; /* physical memory */
60 extern long realmem; /* 'real' memory */
62 extern char *rootdevnames[2]; /* names of possible root devices */
64 extern int boothowto; /* reboot flags, from console subsystem */
65 extern int bootverbose; /* nonzero to print verbose messages */
67 extern int maxusers; /* system tune hint */
69 #ifdef INVARIANTS /* The option is always available */
70 #define KASSERT(exp,msg) do { \
71 if (__predict_false(!(exp))) \
74 #define VNASSERT(exp, vp, msg) do { \
75 if (__predict_false(!(exp))) { \
76 vn_printf(vp, "VNASSERT failed\n"); \
81 #define KASSERT(exp,msg) do { \
84 #define VNASSERT(exp, vp, msg) do { \
88 #ifndef CTASSERT /* Allow lint to override */
89 #define CTASSERT(x) _CTASSERT(x, __LINE__)
90 #define _CTASSERT(x, y) __CTASSERT(x, y)
91 #define __CTASSERT(x, y) typedef char __assert ## y[(x) ? 1 : -1]
95 * XXX the hints declarations are even more misplaced than most declarations
96 * in this file, since they are needed in one file (per arch) and only used
98 * XXX most of these variables should be const.
100 extern int osreldate;
102 extern int hintmode; /* 0 = off. 1 = config, 2 = fallback */
103 extern int dynamic_kenv;
104 extern struct mtx kenv_lock;
105 extern char *kern_envp;
106 extern char static_env[];
107 extern char static_hints[]; /* by config for now */
112 * General function declarations.
126 int setjmp(struct _jmp_buf *);
127 void longjmp(struct _jmp_buf *, int) __dead2;
128 int dumpstatus(vm_offset_t addr, off_t count);
130 int eopnotsupp(void);
131 int ureadc(int, struct uio *);
132 void hashdestroy(void *, struct malloc_type *, u_long);
133 void *hashinit(int count, struct malloc_type *type, u_long *hashmark);
134 void *hashinit_flags(int count, struct malloc_type *type,
135 u_long *hashmask, int flags);
136 #define HASH_NOWAIT 0x00000001
137 #define HASH_WAITOK 0x00000002
139 void *phashinit(int count, struct malloc_type *type, u_long *nentries);
140 void g_waitidle(void);
142 #ifdef RESTARTABLE_PANICS
143 void panic(const char *, ...) __printflike(1, 2);
145 void panic(const char *, ...) __dead2 __printflike(1, 2);
149 void cpu_rootconf(void);
150 void critical_enter(void);
151 void critical_exit(void);
152 void init_param1(void);
153 void init_param2(long physpages);
154 void init_param3(long kmempages);
155 void tablefull(const char *);
156 int kvprintf(char const *, void (*)(int, void*), void *, int,
157 __va_list) __printflike(1, 0);
158 void log(int, const char *, ...) __printflike(2, 3);
159 void log_console(struct uio *);
160 int printf(const char *, ...) __printflike(1, 2);
161 int snprintf(char *, size_t, const char *, ...) __printflike(3, 4);
162 int sprintf(char *buf, const char *, ...) __printflike(2, 3);
163 int uprintf(const char *, ...) __printflike(1, 2);
164 int vprintf(const char *, __va_list) __printflike(1, 0);
165 int vsnprintf(char *, size_t, const char *, __va_list) __printflike(3, 0);
166 int vsnrprintf(char *, size_t, int, const char *, __va_list) __printflike(4, 0);
167 int vsprintf(char *buf, const char *, __va_list) __printflike(2, 0);
168 int ttyprintf(struct tty *, const char *, ...) __printflike(2, 3);
169 int sscanf(const char *, char const *, ...) __nonnull(1) __nonnull(2);
170 int vsscanf(const char *, char const *, __va_list) __nonnull(1) __nonnull(2);
171 long strtol(const char *, char **, int) __nonnull(1);
172 u_long strtoul(const char *, char **, int) __nonnull(1);
173 quad_t strtoq(const char *, char **, int) __nonnull(1);
174 u_quad_t strtouq(const char *, char **, int) __nonnull(1);
175 void tprintf(struct proc *p, int pri, const char *, ...) __printflike(3, 4);
176 void hexdump(const void *ptr, int length, const char *hdr, int flags);
177 #define HD_COLUMN_MASK 0xff
178 #define HD_DELIM_MASK 0xff00
179 #define HD_OMIT_COUNT (1 << 16)
180 #define HD_OMIT_HEX (1 << 17)
181 #define HD_OMIT_CHARS (1 << 18)
183 #define ovbcopy(f, t, l) bcopy((f), (t), (l))
184 void bcopy(const void *from, void *to, size_t len) __nonnull(1) __nonnull(2);
185 void bzero(void *buf, size_t len) __nonnull(1);
187 void *memcpy(void *to, const void *from, size_t len) __nonnull(1) __nonnull(2);
189 int copystr(const void * __restrict kfaddr, void * __restrict kdaddr,
190 size_t len, size_t * __restrict lencopied)
191 __nonnull(1) __nonnull(2);
192 int copyinstr(const void * __restrict udaddr, void * __restrict kaddr,
193 size_t len, size_t * __restrict lencopied)
194 __nonnull(1) __nonnull(2);
195 int copyin(const void * __restrict udaddr, void * __restrict kaddr,
196 size_t len) __nonnull(1) __nonnull(2);
197 int copyout(const void * __restrict kaddr, void * __restrict udaddr,
198 size_t len) __nonnull(1) __nonnull(2);
200 int fubyte(const void *base);
201 long fuword(const void *base);
202 int fuword16(void *base);
203 int32_t fuword32(const void *base);
204 int64_t fuword64(const void *base);
205 int subyte(void *base, int byte);
206 int suword(void *base, long word);
207 int suword16(void *base, int word);
208 int suword32(void *base, int32_t word);
209 int suword64(void *base, int64_t word);
210 uint32_t casuword32(volatile uint32_t *base, uint32_t oldval, uint32_t newval);
211 u_long casuword(volatile u_long *p, u_long oldval, u_long newval);
213 void realitexpire(void *);
215 int sysbeep(int hertz, int period);
218 * Cyclic clock function type definition used to hook the cyclic
219 * subsystem into the appropriate timer interrupt.
221 typedef void (*cyclic_clock_func_t)(void);
223 void hardclock(int usermode, uintfptr_t pc);
224 void hardclock_cpu(int usermode);
225 void softclock(void *);
226 void statclock(int usermode);
227 void profclock(int usermode, uintfptr_t pc);
229 void startprofclock(struct proc *);
230 void stopprofclock(struct proc *);
231 void cpu_startprofclock(void);
232 void cpu_stopprofclock(void);
234 int cr_cansee(struct ucred *u1, struct ucred *u2);
235 int cr_canseesocket(struct ucred *cred, struct socket *so);
237 char *getenv(const char *name);
238 void freeenv(char *env);
239 int getenv_int(const char *name, int *data);
240 int getenv_uint(const char *name, unsigned int *data);
241 int getenv_long(const char *name, long *data);
242 int getenv_ulong(const char *name, unsigned long *data);
243 int getenv_string(const char *name, char *data, int size);
244 int getenv_quad(const char *name, quad_t *data);
245 int setenv(const char *name, const char *value);
246 int unsetenv(const char *name);
247 int testenv(const char *name);
249 typedef uint64_t (cpu_tick_f)(void);
250 void set_cputicker(cpu_tick_f *func, uint64_t freq, unsigned var);
251 extern cpu_tick_f *cpu_ticks;
252 uint64_t cpu_tickrate(void);
253 uint64_t cputick2usec(uint64_t tick);
255 #ifdef APM_FIXUP_CALLTODO
257 void adjust_timeout_calltodo(struct timeval *time_change);
258 #endif /* APM_FIXUP_CALLTODO */
260 #include <sys/libkern.h>
262 /* Initialize the world */
264 void cpu_initclocks(void);
265 void usrinfoinit(void);
267 /* Finalize the world */
268 void shutdown_nice(int);
271 typedef void timeout_t(void *); /* timeout function type */
272 #define CALLOUT_HANDLE_INITIALIZER(handle) \
275 void callout_handle_init(struct callout_handle *);
276 struct callout_handle timeout(timeout_t *, void *, int);
277 void untimeout(timeout_t *, void *, struct callout_handle);
278 caddr_t kern_timeout_callwheel_alloc(caddr_t v);
279 void kern_timeout_callwheel_init(void);
281 /* Stubs for obsolete functions that used to be for interrupt management */
282 static __inline void spl0(void) { return; }
283 static __inline intrmask_t splbio(void) { return 0; }
284 static __inline intrmask_t splcam(void) { return 0; }
285 static __inline intrmask_t splclock(void) { return 0; }
286 static __inline intrmask_t splhigh(void) { return 0; }
287 static __inline intrmask_t splimp(void) { return 0; }
288 static __inline intrmask_t splnet(void) { return 0; }
289 static __inline intrmask_t splsoftcam(void) { return 0; }
290 static __inline intrmask_t splsoftclock(void) { return 0; }
291 static __inline intrmask_t splsofttty(void) { return 0; }
292 static __inline intrmask_t splsoftvm(void) { return 0; }
293 static __inline intrmask_t splsofttq(void) { return 0; }
294 static __inline intrmask_t splstatclock(void) { return 0; }
295 static __inline intrmask_t spltty(void) { return 0; }
296 static __inline intrmask_t splvm(void) { return 0; }
297 static __inline void splx(intrmask_t ipl __unused) { return; }
300 * Common `proc' functions are declared here so that proc.h can be included
303 int _sleep(void *chan, struct lock_object *lock, int pri, const char *wmesg,
304 int timo) __nonnull(1);
305 #define msleep(chan, mtx, pri, wmesg, timo) \
306 _sleep((chan), &(mtx)->lock_object, (pri), (wmesg), (timo))
307 int msleep_spin(void *chan, struct mtx *mtx, const char *wmesg, int timo)
309 int pause(const char *wmesg, int timo);
310 #define tsleep(chan, pri, wmesg, timo) \
311 _sleep((chan), NULL, (pri), (wmesg), (timo))
312 void wakeup(void *chan) __nonnull(1);
313 void wakeup_one(void *chan) __nonnull(1);
316 * Common `struct cdev *' stuff are declared here to avoid #include poisoning
320 int minor(struct cdev *x);
321 dev_t dev2udev(struct cdev *x);
322 int uminor(dev_t dev);
323 int umajor(dev_t dev);
324 const char *devtoname(struct cdev *cdev);
326 /* XXX: Should be void nanodelay(u_int nsec); */
327 void DELAY(int usec);
329 /* Root mount holdback API */
330 struct root_hold_token;
332 struct root_hold_token *root_mount_hold(const char *identifier);
333 void root_mount_rel(struct root_hold_token *h);
334 void root_mount_wait(void);
335 int root_mounted(void);
339 * Unit number allocation API. (kern/subr_unit.c)
342 struct unrhdr *new_unrhdr(int low, int high, struct mtx *mutex);
343 void delete_unrhdr(struct unrhdr *uh);
344 void clean_unrhdr(struct unrhdr *uh);
345 void clean_unrhdrl(struct unrhdr *uh);
346 int alloc_unr(struct unrhdr *uh);
347 int alloc_unrl(struct unrhdr *uh);
348 void free_unr(struct unrhdr *uh, u_int item);
351 * This is about as magic as it gets. fortune(1) has got similar code
352 * for reversing bits in a word. Who thinks up this stuff??
354 * Yes, it does appear to be consistently faster than:
355 * while (i = ffs(m)) {
360 * while (lsb = (m & -m)) { // This is magic too
361 * m &= ~lsb; // or: m ^= lsb
364 * Both of these latter forms do some very strange things on gcc-3.1 with
365 * -mcpu=pentiumpro and/or -march=pentiumpro and/or -O or -O2.
366 * There is probably an SSE or MMX popcnt instruction.
368 * I wonder if this should be in libkern?
370 * XXX Stop the presses! Another one:
371 * static __inline u_int32_t
372 * popcnt1(u_int32_t v)
374 * v -= ((v >> 1) & 0x55555555);
375 * v = (v & 0x33333333) + ((v >> 2) & 0x33333333);
376 * v = (v + (v >> 4)) & 0x0F0F0F0F;
377 * return (v * 0x01010101) >> 24;
379 * The downside is that it has a multiply. With a pentium3 with
380 * -mcpu=pentiumpro and -march=pentiumpro then gcc-3.1 will use
381 * an imull, and in that case it is faster. In most other cases
382 * it appears slightly slower.
384 * Another variant (also from fortune):
385 * #define BITCOUNT(x) (((BX_(x)+(BX_(x)>>4)) & 0x0F0F0F0F) % 255)
386 * #define BX_(x) ((x) - (((x)>>1)&0x77777777) \
387 * - (((x)>>2)&0x33333333) \
388 * - (((x)>>3)&0x11111111))
390 static __inline uint32_t
391 bitcount32(uint32_t x)
394 x = (x & 0x55555555) + ((x & 0xaaaaaaaa) >> 1);
395 x = (x & 0x33333333) + ((x & 0xcccccccc) >> 2);
396 x = (x + (x >> 4)) & 0x0f0f0f0f;
398 x = (x + (x >> 16)) & 0x000000ff;
402 #endif /* !_SYS_SYSTM_H_ */