2 * Copyright (c) 1982, 1988, 1991, 1993
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4 * (c) UNIX System Laboratories, Inc.
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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 cold; /* nonzero if we are doing a cold boot */
49 extern int rebooting; /* boot() has been called. */
50 extern const char *panicstr; /* panic message */
51 extern char version[]; /* system version */
52 extern char copyright[]; /* system copyright */
53 extern int kstack_pages; /* number of kernel stack pages */
55 extern int nswap; /* size of swap space */
57 extern u_long pagesizes[]; /* supported page sizes */
58 extern long physmem; /* physical memory */
59 extern long realmem; /* 'real' memory */
61 extern char *rootdevnames[2]; /* names of possible root devices */
63 extern int boothowto; /* reboot flags, from console subsystem */
64 extern int bootverbose; /* nonzero to print verbose messages */
66 extern int maxusers; /* system tune hint */
68 #ifdef INVARIANTS /* The option is always available */
69 #define KASSERT(exp,msg) do { \
70 if (__predict_false(!(exp))) \
73 #define VNASSERT(exp, vp, msg) do { \
74 if (__predict_false(!(exp))) { \
75 vn_printf(vp, "VNASSERT failed\n"); \
80 #define KASSERT(exp,msg) do { \
83 #define VNASSERT(exp, vp, msg) do { \
87 #ifndef CTASSERT /* Allow lint to override */
88 #define CTASSERT(x) _CTASSERT(x, __LINE__)
89 #define _CTASSERT(x, y) __CTASSERT(x, y)
90 #define __CTASSERT(x, y) typedef char __assert ## y[(x) ? 1 : -1]
94 * Assert that a pointer can be loaded from memory atomically.
96 * This assertion enforces stronger alignment than necessary. For example,
97 * on some architectures, atomicity for unaligned loads will depend on
98 * whether or not the load spans multiple cache lines.
100 #define ASSERT_ATOMIC_LOAD_PTR(var, msg) \
101 KASSERT(sizeof(var) == sizeof(void *) && \
102 ((uintptr_t)&(var) & (sizeof(void *) - 1)) == 0, msg)
105 * XXX the hints declarations are even more misplaced than most declarations
106 * in this file, since they are needed in one file (per arch) and only used
108 * XXX most of these variables should be const.
110 extern int osreldate;
112 extern int hintmode; /* 0 = off. 1 = config, 2 = fallback */
113 extern int dynamic_kenv;
114 extern struct mtx kenv_lock;
115 extern char *kern_envp;
116 extern char static_env[];
117 extern char static_hints[]; /* by config for now */
122 * General function declarations.
137 int setjmp(struct _jmp_buf *);
138 void longjmp(struct _jmp_buf *, int) __dead2;
139 int dumpstatus(vm_offset_t addr, off_t count);
141 int eopnotsupp(void);
142 int ureadc(int, struct uio *);
143 void hashdestroy(void *, struct malloc_type *, u_long);
144 void *hashinit(int count, struct malloc_type *type, u_long *hashmark);
145 void *hashinit_flags(int count, struct malloc_type *type,
146 u_long *hashmask, int flags);
147 #define HASH_NOWAIT 0x00000001
148 #define HASH_WAITOK 0x00000002
150 void *phashinit(int count, struct malloc_type *type, u_long *nentries);
151 void g_waitidle(void);
153 #ifdef RESTARTABLE_PANICS
154 void panic(const char *, ...) __printflike(1, 2);
156 void panic(const char *, ...) __dead2 __printflike(1, 2);
160 void cpu_flush_dcache(void *, size_t);
161 void cpu_rootconf(void);
162 void critical_enter(void);
163 void critical_exit(void);
164 void init_param1(void);
165 void init_param2(long physpages);
166 void init_param3(long kmempages);
167 void tablefull(const char *);
168 int kvprintf(char const *, void (*)(int, void*), void *, int,
169 __va_list) __printflike(1, 0);
170 void log(int, const char *, ...) __printflike(2, 3);
171 void log_console(struct uio *);
172 int printf(const char *, ...) __printflike(1, 2);
173 int snprintf(char *, size_t, const char *, ...) __printflike(3, 4);
174 int sprintf(char *buf, const char *, ...) __printflike(2, 3);
175 int uprintf(const char *, ...) __printflike(1, 2);
176 int vprintf(const char *, __va_list) __printflike(1, 0);
177 int vsnprintf(char *, size_t, const char *, __va_list) __printflike(3, 0);
178 int vsnrprintf(char *, size_t, int, const char *, __va_list) __printflike(4, 0);
179 int vsprintf(char *buf, const char *, __va_list) __printflike(2, 0);
180 int ttyprintf(struct tty *, const char *, ...) __printflike(2, 3);
181 int sscanf(const char *, char const *, ...) __nonnull(1) __nonnull(2);
182 int vsscanf(const char *, char const *, __va_list) __nonnull(1) __nonnull(2);
183 long strtol(const char *, char **, int) __nonnull(1);
184 u_long strtoul(const char *, char **, int) __nonnull(1);
185 quad_t strtoq(const char *, char **, int) __nonnull(1);
186 u_quad_t strtouq(const char *, char **, int) __nonnull(1);
187 void tprintf(struct proc *p, int pri, const char *, ...) __printflike(3, 4);
188 void hexdump(const void *ptr, int length, const char *hdr, int flags);
189 #define HD_COLUMN_MASK 0xff
190 #define HD_DELIM_MASK 0xff00
191 #define HD_OMIT_COUNT (1 << 16)
192 #define HD_OMIT_HEX (1 << 17)
193 #define HD_OMIT_CHARS (1 << 18)
195 #define ovbcopy(f, t, l) bcopy((f), (t), (l))
196 void bcopy(const void *from, void *to, size_t len) __nonnull(1) __nonnull(2);
197 void bzero(void *buf, size_t len) __nonnull(1);
199 void *memcpy(void *to, const void *from, size_t len) __nonnull(1) __nonnull(2);
200 void *memmove(void *dest, const void *src, size_t n) __nonnull(1) __nonnull(2);
202 int copystr(const void * __restrict kfaddr, void * __restrict kdaddr,
203 size_t len, size_t * __restrict lencopied)
204 __nonnull(1) __nonnull(2);
205 int copyinstr(const void * __restrict udaddr, void * __restrict kaddr,
206 size_t len, size_t * __restrict lencopied)
207 __nonnull(1) __nonnull(2);
208 int copyin(const void * __restrict udaddr, void * __restrict kaddr,
209 size_t len) __nonnull(1) __nonnull(2);
210 int copyout(const void * __restrict kaddr, void * __restrict udaddr,
211 size_t len) __nonnull(1) __nonnull(2);
213 int fubyte(const void *base);
214 long fuword(const void *base);
215 int fuword16(void *base);
216 int32_t fuword32(const void *base);
217 int64_t fuword64(const void *base);
218 int subyte(void *base, int byte);
219 int suword(void *base, long word);
220 int suword16(void *base, int word);
221 int suword32(void *base, int32_t word);
222 int suword64(void *base, int64_t word);
223 uint32_t casuword32(volatile uint32_t *base, uint32_t oldval, uint32_t newval);
224 u_long casuword(volatile u_long *p, u_long oldval, u_long newval);
226 void realitexpire(void *);
228 int sysbeep(int hertz, int period);
230 void hardclock(int usermode, uintfptr_t pc);
231 void hardclock_cpu(int usermode);
232 void softclock(void *);
233 void statclock(int usermode);
234 void profclock(int usermode, uintfptr_t pc);
236 void startprofclock(struct proc *);
237 void stopprofclock(struct proc *);
238 void cpu_startprofclock(void);
239 void cpu_stopprofclock(void);
241 int cr_cansee(struct ucred *u1, struct ucred *u2);
242 int cr_canseesocket(struct ucred *cred, struct socket *so);
243 int cr_canseeinpcb(struct ucred *cred, struct inpcb *inp);
245 char *getenv(const char *name);
246 void freeenv(char *env);
247 int getenv_int(const char *name, int *data);
248 int getenv_uint(const char *name, unsigned int *data);
249 int getenv_long(const char *name, long *data);
250 int getenv_ulong(const char *name, unsigned long *data);
251 int getenv_string(const char *name, char *data, int size);
252 int getenv_quad(const char *name, quad_t *data);
253 int setenv(const char *name, const char *value);
254 int unsetenv(const char *name);
255 int testenv(const char *name);
257 typedef uint64_t (cpu_tick_f)(void);
258 void set_cputicker(cpu_tick_f *func, uint64_t freq, unsigned var);
259 extern cpu_tick_f *cpu_ticks;
260 uint64_t cpu_tickrate(void);
261 uint64_t cputick2usec(uint64_t tick);
263 #ifdef APM_FIXUP_CALLTODO
265 void adjust_timeout_calltodo(struct timeval *time_change);
266 #endif /* APM_FIXUP_CALLTODO */
268 #include <sys/libkern.h>
270 /* Initialize the world */
272 void cpu_initclocks(void);
273 void usrinfoinit(void);
275 /* Finalize the world */
276 void shutdown_nice(int);
279 typedef void timeout_t(void *); /* timeout function type */
280 #define CALLOUT_HANDLE_INITIALIZER(handle) \
283 void callout_handle_init(struct callout_handle *);
284 struct callout_handle timeout(timeout_t *, void *, int);
285 void untimeout(timeout_t *, void *, struct callout_handle);
286 caddr_t kern_timeout_callwheel_alloc(caddr_t v);
287 void kern_timeout_callwheel_init(void);
289 /* Stubs for obsolete functions that used to be for interrupt management */
290 static __inline void spl0(void) { return; }
291 static __inline intrmask_t splbio(void) { return 0; }
292 static __inline intrmask_t splcam(void) { return 0; }
293 static __inline intrmask_t splclock(void) { return 0; }
294 static __inline intrmask_t splhigh(void) { return 0; }
295 static __inline intrmask_t splimp(void) { return 0; }
296 static __inline intrmask_t splnet(void) { return 0; }
297 static __inline intrmask_t splsoftcam(void) { return 0; }
298 static __inline intrmask_t splsoftclock(void) { return 0; }
299 static __inline intrmask_t splsofttty(void) { return 0; }
300 static __inline intrmask_t splsoftvm(void) { return 0; }
301 static __inline intrmask_t splsofttq(void) { return 0; }
302 static __inline intrmask_t splstatclock(void) { return 0; }
303 static __inline intrmask_t spltty(void) { return 0; }
304 static __inline intrmask_t splvm(void) { return 0; }
305 static __inline void splx(intrmask_t ipl __unused) { return; }
308 * Common `proc' functions are declared here so that proc.h can be included
311 int _sleep(void *chan, struct lock_object *lock, int pri, const char *wmesg,
312 int timo) __nonnull(1);
313 #define msleep(chan, mtx, pri, wmesg, timo) \
314 _sleep((chan), &(mtx)->lock_object, (pri), (wmesg), (timo))
315 int msleep_spin(void *chan, struct mtx *mtx, const char *wmesg, int timo)
317 int pause(const char *wmesg, int timo);
318 #define tsleep(chan, pri, wmesg, timo) \
319 _sleep((chan), NULL, (pri), (wmesg), (timo))
320 void wakeup(void *chan) __nonnull(1);
321 void wakeup_one(void *chan) __nonnull(1);
324 * Common `struct cdev *' stuff are declared here to avoid #include poisoning
328 dev_t dev2udev(struct cdev *x);
329 const char *devtoname(struct cdev *cdev);
331 int poll_no_poll(int events);
333 /* XXX: Should be void nanodelay(u_int nsec); */
334 void DELAY(int usec);
336 /* Root mount holdback API */
337 struct root_hold_token;
339 struct root_hold_token *root_mount_hold(const char *identifier);
340 void root_mount_rel(struct root_hold_token *h);
341 void root_mount_wait(void);
342 int root_mounted(void);
346 * Unit number allocation API. (kern/subr_unit.c)
349 struct unrhdr *new_unrhdr(int low, int high, struct mtx *mutex);
350 void delete_unrhdr(struct unrhdr *uh);
351 void clean_unrhdr(struct unrhdr *uh);
352 void clean_unrhdrl(struct unrhdr *uh);
353 int alloc_unr(struct unrhdr *uh);
354 int alloc_unrl(struct unrhdr *uh);
355 void free_unr(struct unrhdr *uh, u_int item);
358 * This is about as magic as it gets. fortune(1) has got similar code
359 * for reversing bits in a word. Who thinks up this stuff??
361 * Yes, it does appear to be consistently faster than:
362 * while (i = ffs(m)) {
367 * while (lsb = (m & -m)) { // This is magic too
368 * m &= ~lsb; // or: m ^= lsb
371 * Both of these latter forms do some very strange things on gcc-3.1 with
372 * -mcpu=pentiumpro and/or -march=pentiumpro and/or -O or -O2.
373 * There is probably an SSE or MMX popcnt instruction.
375 * I wonder if this should be in libkern?
377 * XXX Stop the presses! Another one:
378 * static __inline u_int32_t
379 * popcnt1(u_int32_t v)
381 * v -= ((v >> 1) & 0x55555555);
382 * v = (v & 0x33333333) + ((v >> 2) & 0x33333333);
383 * v = (v + (v >> 4)) & 0x0F0F0F0F;
384 * return (v * 0x01010101) >> 24;
386 * The downside is that it has a multiply. With a pentium3 with
387 * -mcpu=pentiumpro and -march=pentiumpro then gcc-3.1 will use
388 * an imull, and in that case it is faster. In most other cases
389 * it appears slightly slower.
391 * Another variant (also from fortune):
392 * #define BITCOUNT(x) (((BX_(x)+(BX_(x)>>4)) & 0x0F0F0F0F) % 255)
393 * #define BX_(x) ((x) - (((x)>>1)&0x77777777) \
394 * - (((x)>>2)&0x33333333) \
395 * - (((x)>>3)&0x11111111))
397 static __inline uint32_t
398 bitcount32(uint32_t x)
401 x = (x & 0x55555555) + ((x & 0xaaaaaaaa) >> 1);
402 x = (x & 0x33333333) + ((x & 0xcccccccc) >> 2);
403 x = (x + (x >> 4)) & 0x0f0f0f0f;
405 x = (x + (x >> 16)) & 0x000000ff;
409 #endif /* !_SYS_SYSTM_H_ */