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
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8 * the permission of UNIX System Laboratories, Inc.
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14 * notice, this list of conditions and the following disclaimer.
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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 u_int nselcoll; /* select collisions since boot */
60 extern struct mtx sellock; /* select lock variable */
61 extern struct cv selwait; /* select conditional variable */
63 extern long physmem; /* physical memory */
64 extern long realmem; /* 'real' memory */
66 extern char *rootdevnames[2]; /* names of possible root devices */
68 extern int boothowto; /* reboot flags, from console subsystem */
69 extern int bootverbose; /* nonzero to print verbose messages */
71 extern int maxusers; /* system tune hint */
73 #ifdef INVARIANTS /* The option is always available */
74 #define KASSERT(exp,msg) do { \
75 if (__predict_false(!(exp))) \
78 #define VNASSERT(exp, vp, msg) do { \
79 if (__predict_false(!(exp))) { \
80 vn_printf(vp, "VNASSERT failed\n"); \
85 #define KASSERT(exp,msg) do { \
88 #define VNASSERT(exp, vp, msg) do { \
92 #ifndef CTASSERT /* Allow lint to override */
93 #define CTASSERT(x) _CTASSERT(x, __LINE__)
94 #define _CTASSERT(x, y) __CTASSERT(x, y)
95 #define __CTASSERT(x, y) typedef char __assert ## y[(x) ? 1 : -1]
99 * XXX the hints declarations are even more misplaced than most declarations
100 * in this file, since they are needed in one file (per arch) and only used
102 * XXX most of these variables should be const.
104 extern int osreldate;
106 extern int hintmode; /* 0 = off. 1 = config, 2 = fallback */
107 extern int dynamic_kenv;
108 extern struct mtx kenv_lock;
109 extern char *kern_envp;
110 extern char static_env[];
111 extern char static_hints[]; /* by config for now */
116 * General function declarations.
132 int setjmp(struct _jmp_buf *);
133 void longjmp(struct _jmp_buf *, int) __dead2;
134 int dumpstatus(vm_offset_t addr, off_t count);
136 int eopnotsupp(void);
137 int ureadc(int, struct uio *);
138 void hashdestroy(void *, struct malloc_type *, u_long);
139 void *hashinit(int count, struct malloc_type *type, u_long *hashmark);
140 void *hashinit_flags(int count, struct malloc_type *type,
141 u_long *hashmask, int flags);
142 #define HASH_NOWAIT 0x00000001
143 #define HASH_WAITOK 0x00000002
145 void *phashinit(int count, struct malloc_type *type, u_long *nentries);
146 void g_waitidle(void);
148 #ifdef RESTARTABLE_PANICS
149 void panic(const char *, ...) __printflike(1, 2);
151 void panic(const char *, ...) __dead2 __printflike(1, 2);
155 void cpu_rootconf(void);
156 void critical_enter(void);
157 void critical_exit(void);
158 void init_param1(void);
159 void init_param2(long physpages);
160 void init_param3(long kmempages);
161 void tablefull(const char *);
162 int kvprintf(char const *, void (*)(int, void*), void *, int,
163 __va_list) __printflike(1, 0);
164 void log(int, const char *, ...) __printflike(2, 3);
165 void log_console(struct uio *);
166 int printf(const char *, ...) __printflike(1, 2);
167 int snprintf(char *, size_t, const char *, ...) __printflike(3, 4);
168 int sprintf(char *buf, const char *, ...) __printflike(2, 3);
169 int uprintf(const char *, ...) __printflike(1, 2);
170 int vprintf(const char *, __va_list) __printflike(1, 0);
171 int vsnprintf(char *, size_t, const char *, __va_list) __printflike(3, 0);
172 int vsnrprintf(char *, size_t, int, const char *, __va_list) __printflike(4, 0);
173 int vsprintf(char *buf, const char *, __va_list) __printflike(2, 0);
174 int ttyprintf(struct tty *, const char *, ...) __printflike(2, 3);
175 int sscanf(const char *, char const *, ...) __nonnull(1) __nonnull(2);
176 int vsscanf(const char *, char const *, __va_list) __nonnull(1) __nonnull(2);
177 long strtol(const char *, char **, int) __nonnull(1);
178 u_long strtoul(const char *, char **, int) __nonnull(1);
179 quad_t strtoq(const char *, char **, int) __nonnull(1);
180 u_quad_t strtouq(const char *, char **, int) __nonnull(1);
181 void tprintf(struct proc *p, int pri, const char *, ...) __printflike(3, 4);
182 void hexdump(const void *ptr, int length, const char *hdr, int flags);
183 #define HD_COLUMN_MASK 0xff
184 #define HD_DELIM_MASK 0xff00
185 #define HD_OMIT_COUNT (1 << 16)
186 #define HD_OMIT_HEX (1 << 17)
187 #define HD_OMIT_CHARS (1 << 18)
189 #define ovbcopy(f, t, l) bcopy((f), (t), (l))
190 void bcopy(const void *from, void *to, size_t len) __nonnull(1) __nonnull(2);
191 void bzero(void *buf, size_t len) __nonnull(1);
193 void *memcpy(void *to, const void *from, size_t len) __nonnull(1) __nonnull(2);
195 int copystr(const void * __restrict kfaddr, void * __restrict kdaddr,
196 size_t len, size_t * __restrict lencopied)
197 __nonnull(1) __nonnull(2);
198 int copyinstr(const void * __restrict udaddr, void * __restrict kaddr,
199 size_t len, size_t * __restrict lencopied)
200 __nonnull(1) __nonnull(2);
201 int copyin(const void * __restrict udaddr, void * __restrict kaddr,
202 size_t len) __nonnull(1) __nonnull(2);
203 int copyout(const void * __restrict kaddr, void * __restrict udaddr,
204 size_t len) __nonnull(1) __nonnull(2);
206 int fubyte(const void *base);
207 long fuword(const void *base);
208 int fuword16(void *base);
209 int32_t fuword32(const void *base);
210 int64_t fuword64(const void *base);
211 int subyte(void *base, int byte);
212 int suword(void *base, long word);
213 int suword16(void *base, int word);
214 int suword32(void *base, int32_t word);
215 int suword64(void *base, int64_t word);
216 uint32_t casuword32(volatile uint32_t *base, uint32_t oldval, uint32_t newval);
217 u_long casuword(volatile u_long *p, u_long oldval, u_long newval);
219 void realitexpire(void *);
221 void hardclock(int usermode, uintfptr_t pc);
222 void hardclock_cpu(int usermode);
223 void softclock(void *);
224 void statclock(int usermode);
225 void profclock(int usermode, uintfptr_t pc);
227 void startprofclock(struct proc *);
228 void stopprofclock(struct proc *);
229 void cpu_startprofclock(void);
230 void cpu_stopprofclock(void);
232 int cr_cansee(struct ucred *u1, struct ucred *u2);
233 int cr_canseesocket(struct ucred *cred, struct socket *so);
234 int cr_canseeinpcb(struct ucred *cred, struct inpcb *inp);
236 char *getenv(const char *name);
237 void freeenv(char *env);
238 int getenv_int(const char *name, int *data);
239 long getenv_long(const char *name, long *data);
240 unsigned long getenv_ulong(const char *name, unsigned long *data);
241 int getenv_string(const char *name, char *data, int size);
242 int getenv_quad(const char *name, quad_t *data);
243 int setenv(const char *name, const char *value);
244 int unsetenv(const char *name);
245 int testenv(const char *name);
247 typedef uint64_t (cpu_tick_f)(void);
248 void set_cputicker(cpu_tick_f *func, uint64_t freq, unsigned var);
249 extern cpu_tick_f *cpu_ticks;
250 uint64_t cpu_tickrate(void);
251 uint64_t cputick2usec(uint64_t tick);
253 #ifdef APM_FIXUP_CALLTODO
255 void adjust_timeout_calltodo(struct timeval *time_change);
256 #endif /* APM_FIXUP_CALLTODO */
258 #include <sys/libkern.h>
260 /* Initialize the world */
262 void cpu_initclocks(void);
263 void usrinfoinit(void);
265 /* Finalize the world */
266 void shutdown_nice(int);
269 typedef void timeout_t(void *); /* timeout function type */
270 #define CALLOUT_HANDLE_INITIALIZER(handle) \
273 void callout_handle_init(struct callout_handle *);
274 struct callout_handle timeout(timeout_t *, void *, int);
275 void untimeout(timeout_t *, void *, struct callout_handle);
276 caddr_t kern_timeout_callwheel_alloc(caddr_t v);
277 void kern_timeout_callwheel_init(void);
279 /* Stubs for obsolete functions that used to be for interrupt management */
280 static __inline void spl0(void) { return; }
281 static __inline intrmask_t splbio(void) { return 0; }
282 static __inline intrmask_t splcam(void) { return 0; }
283 static __inline intrmask_t splclock(void) { return 0; }
284 static __inline intrmask_t splhigh(void) { return 0; }
285 static __inline intrmask_t splimp(void) { return 0; }
286 static __inline intrmask_t splnet(void) { return 0; }
287 static __inline intrmask_t splsoftcam(void) { return 0; }
288 static __inline intrmask_t splsoftclock(void) { return 0; }
289 static __inline intrmask_t splsofttty(void) { return 0; }
290 static __inline intrmask_t splsoftvm(void) { return 0; }
291 static __inline intrmask_t splsofttq(void) { return 0; }
292 static __inline intrmask_t splstatclock(void) { return 0; }
293 static __inline intrmask_t spltty(void) { return 0; }
294 static __inline intrmask_t splvm(void) { return 0; }
295 static __inline void splx(intrmask_t ipl __unused) { return; }
298 * Common `proc' functions are declared here so that proc.h can be included
301 int _sleep(void *chan, struct lock_object *lock, int pri, const char *wmesg,
302 int timo) __nonnull(1);
303 #define msleep(chan, mtx, pri, wmesg, timo) \
304 _sleep((chan), &(mtx)->lock_object, (pri), (wmesg), (timo))
305 int msleep_spin(void *chan, struct mtx *mtx, const char *wmesg, int timo)
307 int pause(const char *wmesg, int timo);
308 #define tsleep(chan, pri, wmesg, timo) \
309 _sleep((chan), NULL, (pri), (wmesg), (timo))
310 void wakeup(void *chan) __nonnull(1);
311 void wakeup_one(void *chan) __nonnull(1);
314 * Common `struct cdev *' stuff are declared here to avoid #include poisoning
318 int minor(struct cdev *x);
319 dev_t dev2udev(struct cdev *x);
320 int uminor(dev_t dev);
321 int umajor(dev_t dev);
322 const char *devtoname(struct cdev *cdev);
324 int poll_no_poll(int events);
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_ */