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  * 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: releng/5.1/sys/sys/systm.h 113090 2003-04-04 17:29:55Z des $
   40  */
   41 
   42 #ifndef _SYS_SYSTM_H_
   43 #define _SYS_SYSTM_H_
   44 
   45 #include <machine/atomic.h>
   46 #include <machine/cpufunc.h>
   47 #include <sys/callout.h>
   48 #include <sys/queue.h>
   49 #include <sys/stdint.h>         /* for people using printf mainly */
   50 
   51 extern int securelevel;         /* system security level (see init(8)) */
   52 extern int suser_enabled;       /* suser() is permitted to return 0 */
   53 
   54 extern int cold;                /* nonzero if we are doing a cold boot */
   55 extern const char *panicstr;    /* panic message */
   56 extern char version[];          /* system version */
   57 extern char copyright[];        /* system copyright */
   58 extern int kstack_pages;        /* number of kernel stack pages */
   59 extern int uarea_pages;         /* number of user struct pages */
   60 
   61 extern int nswap;               /* size of swap space */
   62 
   63 extern u_int nselcoll;          /* select collisions since boot */
   64 extern struct mtx sellock;      /* select lock variable */
   65 extern struct cv selwait;       /* select conditional variable */
   66 
   67 extern long physmem;            /* physical memory */
   68 
   69 extern dev_t rootdev;           /* root device */
   70 extern dev_t rootdevs[2];       /* possible root devices */
   71 extern char *rootdevnames[2];   /* names of possible root devices */
   72 extern struct vnode *rootvp;    /* vnode equivalent to above */
   73 
   74 extern int boothowto;           /* reboot flags, from console subsystem */
   75 extern int bootverbose;         /* nonzero to print verbose messages */
   76 
   77 extern int maxusers;            /* system tune hint */
   78 
   79 #ifdef  INVARIANTS              /* The option is always available */
   80 #define KASSERT(exp,msg)        do { if (!(exp)) panic msg; } while (0)
   81 #else
   82 #define KASSERT(exp,msg)
   83 #endif
   84 
   85 #ifndef CTASSERT                /* Allow lint to override */
   86 #define CTASSERT(x)             _CTASSERT(x, __LINE__)
   87 #define _CTASSERT(x, y)         __CTASSERT(x, y)
   88 #define __CTASSERT(x, y)        typedef char __assert ## y[(x) ? 1 : -1]
   89 #endif
   90 
   91 /*
   92  * XXX the hints declarations are even more misplaced than most declarations
   93  * in this file, since they are needed in one file (per arch) and only used
   94  * in two files.
   95  * XXX most of these variables should be const.
   96  */
   97 extern int envmode;
   98 extern int hintmode;            /* 0 = off. 1 = config, 2 = fallback */
   99 extern int dynamic_kenv;
  100 extern struct sx kenv_lock;
  101 extern char *kern_envp;
  102 extern char static_env[];
  103 extern char static_hints[];     /* by config for now */
  104 
  105 extern char **kenvp;
  106 
  107 /*
  108  * General function declarations.
  109  */
  110 
  111 struct clockframe;
  112 struct malloc_type;
  113 struct mtx;
  114 struct proc;
  115 struct kse;
  116 struct socket;
  117 struct thread;
  118 struct tty;
  119 struct ucred;
  120 struct uio;
  121 struct _jmp_buf;
  122 
  123 int     setjmp(struct _jmp_buf *);
  124 void    longjmp(struct _jmp_buf *, int) __dead2;
  125 void    Debugger(const char *msg);
  126 int     dumpstatus(vm_offset_t addr, off_t count);
  127 int     nullop(void);
  128 int     eopnotsupp(void);
  129 int     seltrue(dev_t dev, int which, struct thread *td);
  130 int     ureadc(int, struct uio *);
  131 void    hashdestroy(void *, struct malloc_type *, u_long);
  132 void    *hashinit(int count, struct malloc_type *type, u_long *hashmask);
  133 void    *phashinit(int count, struct malloc_type *type, u_long *nentries);
  134 
  135 #ifdef RESTARTABLE_PANICS
  136 void    panic(const char *, ...) __printflike(1, 2);
  137 #else
  138 void    panic(const char *, ...) __dead2 __printflike(1, 2);
  139 #endif
  140 
  141 void    backtrace(void);
  142 void    cpu_boot(int);
  143 void    cpu_rootconf(void);
  144 extern uint32_t crc32_tab[];
  145 uint32_t crc32(const void *buf, size_t size);
  146 void    critical_enter(void);
  147 void    critical_exit(void);
  148 void    init_param1(void);
  149 void    init_param2(long physpages);
  150 void    tablefull(const char *);
  151 int     kvprintf(char const *, void (*)(int, void*), void *, int,
  152             __va_list) __printflike(1, 0);
  153 void    log(int, const char *, ...) __printflike(2, 3);
  154 void    log_console(struct uio *);
  155 int     printf(const char *, ...) __printflike(1, 2);
  156 int     snprintf(char *, size_t, const char *, ...) __printflike(3, 4);
  157 int     sprintf(char *buf, const char *, ...) __printflike(2, 3);
  158 int     uprintf(const char *, ...) __printflike(1, 2);
  159 int     vprintf(const char *, __va_list) __printflike(1, 0);
  160 int     vsnprintf(char *, size_t, const char *, __va_list) __printflike(3, 0);
  161 int     vsnrprintf(char *, size_t, int, const char *, __va_list) __printflike(4, 0); 
  162 int     vsprintf(char *buf, const char *, __va_list) __printflike(2, 0);
  163 int     ttyprintf(struct tty *, const char *, ...) __printflike(2, 3);
  164 int     sscanf(const char *, char const *, ...);
  165 int     vsscanf(const char *, char const *, __va_list);
  166 long    strtol(const char *, char **, int);
  167 u_long  strtoul(const char *, char **, int);
  168 quad_t  strtoq(const char *, char **, int);
  169 u_quad_t strtouq(const char *, char **, int);
  170 void    tprintf(struct proc *p, int pri, const char *, ...) __printflike(3, 4);
  171 
  172 #define ovbcopy(f, t, l) bcopy((f), (t), (l))
  173 void    bcopy(const void *from, void *to, size_t len);
  174 void    bzero(void *buf, size_t len);
  175 
  176 void    *memcpy(void *to, const void *from, size_t len);
  177 
  178 int     copystr(const void *kfaddr, void *kdaddr, size_t len,
  179             size_t *lencopied);
  180 int     copyinstr(const void *udaddr, void *kaddr, size_t len,
  181             size_t *lencopied);
  182 int     copyin(const void *udaddr, void *kaddr, size_t len);
  183 int     copyout(const void *kaddr, void *udaddr, size_t len);
  184 
  185 int     fubyte(const void *base);
  186 long    fuword(const void *base);
  187 int     fuword16(void *base);
  188 int32_t fuword32(const void *base);
  189 int64_t fuword64(const void *base);
  190 int     subyte(void *base, int byte);
  191 int     suword(void *base, long word);
  192 int     suword16(void *base, int word);
  193 int     suword32(void *base, int32_t word);
  194 int     suword64(void *base, int64_t word);
  195 intptr_t casuptr(intptr_t *p, intptr_t old, intptr_t new);
  196 
  197 void    realitexpire(void *);
  198 
  199 void    hardclock(struct clockframe *frame);
  200 void    hardclock_process(struct clockframe *frame);
  201 void    softclock(void *);
  202 void    statclock(struct clockframe *frame);
  203 void    profclock(struct clockframe *frame);
  204 
  205 void    startprofclock(struct proc *);
  206 void    stopprofclock(struct proc *);
  207 void    cpu_startprofclock(void);
  208 void    cpu_stopprofclock(void);
  209 
  210 /* flags for suser() and suser_cred() */
  211 #define PRISON_ROOT     1
  212 
  213 int     suser(struct thread *td);
  214 int     suser_cred(struct ucred *cred, int flag);
  215 int     cr_cansee(struct ucred *u1, struct ucred *u2);
  216 int     cr_canseesocket(struct ucred *cred, struct socket *so);
  217 
  218 char    *getenv(const char *name);
  219 void    freeenv(char *env);
  220 int     getenv_int(const char *name, int *data);
  221 int     getenv_string(const char *name, char *data, int size);
  222 int     getenv_quad(const char *name, quad_t *data);
  223 int     setenv(const char *name, const char *value);
  224 int     unsetenv(const char *name);
  225 int     testenv(const char *name);
  226 
  227 #ifdef APM_FIXUP_CALLTODO 
  228 struct timeval;
  229 void    adjust_timeout_calltodo(struct timeval *time_change); 
  230 #endif /* APM_FIXUP_CALLTODO */ 
  231 
  232 #include <sys/libkern.h>
  233 
  234 /* Initialize the world */
  235 void    consinit(void);
  236 void    cpu_initclocks(void);
  237 void    usrinfoinit(void);
  238 
  239 /* Finalize the world. */
  240 void    shutdown_nice(int);
  241 
  242 /*
  243  * Kernel to clock driver interface.
  244  */
  245 void    inittodr(time_t base);
  246 void    resettodr(void);
  247 void    startrtclock(void);
  248 
  249 /* Timeouts */
  250 typedef void timeout_t(void *); /* timeout function type */
  251 #define CALLOUT_HANDLE_INITIALIZER(handle)      \
  252         { NULL }
  253 
  254 void    callout_handle_init(struct callout_handle *);
  255 struct  callout_handle timeout(timeout_t *, void *, int);
  256 void    untimeout(timeout_t *, void *, struct callout_handle);
  257 caddr_t kern_timeout_callwheel_alloc(caddr_t v);
  258 void    kern_timeout_callwheel_init(void);
  259 
  260 /* Stubs for obsolete functions that used to be for interrupt  management */
  261 static __inline void            spl0(void)              { return; }
  262 static __inline intrmask_t      splbio(void)            { return 0; }
  263 static __inline intrmask_t      splcam(void)            { return 0; }
  264 static __inline intrmask_t      splclock(void)          { return 0; }
  265 static __inline intrmask_t      splhigh(void)           { return 0; }
  266 static __inline intrmask_t      splimp(void)            { return 0; }
  267 static __inline intrmask_t      splnet(void)            { return 0; }
  268 static __inline intrmask_t      splsoftcam(void)        { return 0; }
  269 static __inline intrmask_t      splsoftclock(void)      { return 0; }
  270 static __inline intrmask_t      splsofttty(void)        { return 0; }
  271 static __inline intrmask_t      splsoftvm(void)         { return 0; }
  272 static __inline intrmask_t      splsofttq(void)         { return 0; }
  273 static __inline intrmask_t      splstatclock(void)      { return 0; }
  274 static __inline intrmask_t      spltty(void)            { return 0; }
  275 static __inline intrmask_t      splvm(void)             { return 0; }
  276 static __inline void            splx(intrmask_t ipl __unused)   { return; }
  277 
  278 /*
  279  * Various callout lists.
  280  */
  281 
  282 /*
  283  * Not exactly a callout LIST, but a callout entry.
  284  * Allow an external module to define a hardware watchdog tickler.
  285  * Normally a process would do this, but there are times when the
  286  * kernel needs to be able to hold off the watchdog, when the process
  287  * is not active, e.g., when dumping core.
  288  */
  289 typedef void (*watchdog_tickle_fn)(void);
  290 
  291 extern watchdog_tickle_fn       wdog_tickler;
  292 
  293 /* 
  294  * Common `proc' functions are declared here so that proc.h can be included
  295  * less often.
  296  */
  297 int     msleep(void *chan, struct mtx *mtx, int pri, const char *wmesg,
  298             int timo);
  299 void    abortsleep(struct thread *td);
  300 #define tsleep(chan, pri, wmesg, timo)  msleep(chan, NULL, pri, wmesg, timo)
  301 void    wakeup(void *chan);
  302 void    wakeup_one(void *chan);
  303 
  304 /*
  305  * Common `dev_t' stuff are declared here to avoid #include poisoning
  306  */
  307 
  308 int major(dev_t x);
  309 int minor(dev_t x);
  310 dev_t makedev(int x, int y);
  311 udev_t dev2udev(dev_t x);
  312 dev_t udev2dev(udev_t x, int b);
  313 int uminor(udev_t dev);
  314 int umajor(udev_t dev);
  315 udev_t makeudev(int x, int y);
  316 
  317 /* XXX: Should be void nanodelay(u_int nsec); */
  318 void    DELAY(int usec);
  319 
  320 #endif /* !_SYS_SYSTM_H_ */

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