The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
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  * 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.
   21  *
   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
   32  * SUCH DAMAGE.
   33  *
   34  *      @(#)systm.h     8.7 (Berkeley) 3/29/95
   35  * $FreeBSD$
   36  */
   37 
   38 #ifndef _SYS_SYSTM_H_
   39 #define _SYS_SYSTM_H_
   40 
   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 */
   47 
   48 extern int securelevel;         /* system security level (see init(8)) */
   49 
   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 */
   56 
   57 extern int nswap;               /* size of swap space */
   58 
   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 */
   62 
   63 extern long physmem;            /* physical memory */
   64 extern long realmem;            /* 'real' memory */
   65 
   66 extern char *rootdevnames[2];   /* names of possible root devices */
   67 
   68 extern int boothowto;           /* reboot flags, from console subsystem */
   69 extern int bootverbose;         /* nonzero to print verbose messages */
   70 
   71 extern int maxusers;            /* system tune hint */
   72 
   73 #ifdef  INVARIANTS              /* The option is always available */
   74 #define KASSERT(exp,msg) do {                                           \
   75         if (__predict_false(!(exp)))                                    \
   76                 panic msg;                                              \
   77 } while (0)
   78 #define VNASSERT(exp, vp, msg) do {                                     \
   79         if (__predict_false(!(exp))) {                                  \
   80                 vn_printf(vp, "VNASSERT failed\n");             \
   81                 panic msg;                                              \
   82         }                                                               \
   83 } while (0)
   84 #else
   85 #define KASSERT(exp,msg) do { \
   86 } while (0)
   87 
   88 #define VNASSERT(exp, vp, msg) do { \
   89 } while (0)
   90 #endif
   91 
   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]
   96 #endif
   97 
   98 /*
   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
  101  * in two files.
  102  * XXX most of these variables should be const.
  103  */
  104 extern int osreldate;
  105 extern int envmode;
  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 */
  112 
  113 extern char **kenvp;
  114 
  115 /*
  116  * General function declarations.
  117  */
  118 
  119 struct inpcb;
  120 struct lock_object;
  121 struct malloc_type;
  122 struct mtx;
  123 struct proc;
  124 struct kse;
  125 struct socket;
  126 struct thread;
  127 struct tty;
  128 struct ucred;
  129 struct uio;
  130 struct _jmp_buf;
  131 
  132 int     setjmp(struct _jmp_buf *);
  133 void    longjmp(struct _jmp_buf *, int) __dead2;
  134 int     dumpstatus(vm_offset_t addr, off_t count);
  135 int     nullop(void);
  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
  144 
  145 void    *phashinit(int count, struct malloc_type *type, u_long *nentries);
  146 void    g_waitidle(void);
  147 
  148 #ifdef RESTARTABLE_PANICS
  149 void    panic(const char *, ...) __printflike(1, 2);
  150 #else
  151 void    panic(const char *, ...) __dead2 __printflike(1, 2);
  152 #endif
  153 
  154 void    cpu_boot(int);
  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)
  188 
  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);
  192 
  193 void    *memcpy(void *to, const void *from, size_t len) __nonnull(1) __nonnull(2);
  194 
  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);
  205 
  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);
  218 
  219 void    realitexpire(void *);
  220 
  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);
  226 
  227 void    startprofclock(struct proc *);
  228 void    stopprofclock(struct proc *);
  229 void    cpu_startprofclock(void);
  230 void    cpu_stopprofclock(void);
  231 
  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);
  235 
  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);
  246 
  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);
  252 
  253 #ifdef APM_FIXUP_CALLTODO
  254 struct timeval;
  255 void    adjust_timeout_calltodo(struct timeval *time_change);
  256 #endif /* APM_FIXUP_CALLTODO */
  257 
  258 #include <sys/libkern.h>
  259 
  260 /* Initialize the world */
  261 void    consinit(void);
  262 void    cpu_initclocks(void);
  263 void    usrinfoinit(void);
  264 
  265 /* Finalize the world */
  266 void    shutdown_nice(int);
  267 
  268 /* Timeouts */
  269 typedef void timeout_t(void *); /* timeout function type */
  270 #define CALLOUT_HANDLE_INITIALIZER(handle)      \
  271         { NULL }
  272 
  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);
  278 
  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; }
  296 
  297 /*
  298  * Common `proc' functions are declared here so that proc.h can be included
  299  * less often.
  300  */
  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)
  306             __nonnull(1);
  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);
  312 
  313 /*
  314  * Common `struct cdev *' stuff are declared here to avoid #include poisoning
  315  */
  316 
  317 struct cdev;
  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);
  323 
  324 /* XXX: Should be void nanodelay(u_int nsec); */
  325 void    DELAY(int usec);
  326 
  327 /* Root mount holdback API */
  328 struct root_hold_token;
  329 
  330 struct root_hold_token *root_mount_hold(const char *identifier);
  331 void root_mount_rel(struct root_hold_token *h);
  332 void root_mount_wait(void);
  333 int root_mounted(void);
  334 
  335 
  336 /*
  337  * Unit number allocation API. (kern/subr_unit.c)
  338  */
  339 struct unrhdr;
  340 struct unrhdr *new_unrhdr(int low, int high, struct mtx *mutex);
  341 void delete_unrhdr(struct unrhdr *uh);
  342 void clean_unrhdr(struct unrhdr *uh);
  343 void clean_unrhdrl(struct unrhdr *uh);
  344 int alloc_unr(struct unrhdr *uh);
  345 int alloc_unrl(struct unrhdr *uh);
  346 void free_unr(struct unrhdr *uh, u_int item);
  347 
  348 /*
  349  * This is about as magic as it gets.  fortune(1) has got similar code
  350  * for reversing bits in a word.  Who thinks up this stuff??
  351  *
  352  * Yes, it does appear to be consistently faster than:
  353  * while (i = ffs(m)) {
  354  *      m >>= i;
  355  *      bits++;
  356  * }
  357  * and
  358  * while (lsb = (m & -m)) {     // This is magic too
  359  *      m &= ~lsb;              // or: m ^= lsb
  360  *      bits++;
  361  * }
  362  * Both of these latter forms do some very strange things on gcc-3.1 with
  363  * -mcpu=pentiumpro and/or -march=pentiumpro and/or -O or -O2.
  364  * There is probably an SSE or MMX popcnt instruction.
  365  *
  366  * I wonder if this should be in libkern?
  367  *
  368  * XXX Stop the presses!  Another one:
  369  * static __inline u_int32_t
  370  * popcnt1(u_int32_t v)
  371  * {
  372  *      v -= ((v >> 1) & 0x55555555);
  373  *      v = (v & 0x33333333) + ((v >> 2) & 0x33333333);
  374  *      v = (v + (v >> 4)) & 0x0F0F0F0F;
  375  *      return (v * 0x01010101) >> 24;
  376  * }
  377  * The downside is that it has a multiply.  With a pentium3 with
  378  * -mcpu=pentiumpro and -march=pentiumpro then gcc-3.1 will use
  379  * an imull, and in that case it is faster.  In most other cases
  380  * it appears slightly slower.
  381  *
  382  * Another variant (also from fortune):
  383  * #define BITCOUNT(x) (((BX_(x)+(BX_(x)>>4)) & 0x0F0F0F0F) % 255)
  384  * #define  BX_(x)     ((x) - (((x)>>1)&0x77777777)            \
  385  *                          - (((x)>>2)&0x33333333)            \
  386  *                          - (((x)>>3)&0x11111111))
  387  */
  388 static __inline uint32_t
  389 bitcount32(uint32_t x)
  390 {
  391 
  392         x = (x & 0x55555555) + ((x & 0xaaaaaaaa) >> 1);
  393         x = (x & 0x33333333) + ((x & 0xcccccccc) >> 2);
  394         x = (x + (x >> 4)) & 0x0f0f0f0f;
  395         x = (x + (x >> 8));
  396         x = (x + (x >> 16)) & 0x000000ff;
  397         return (x);
  398 }
  399 
  400 #endif /* !_SYS_SYSTM_H_ */

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