FreeBSD/Linux Kernel Cross Reference
sys/sys/systm.h

     /*-
      * Copyright (c) 1982, 1988, 1991, 1993
      *      The Regents of the University of California.  All rights reserved.
      * (c) UNIX System Laboratories, Inc.
      * All or some portions of this file are derived from material licensed
      * to the University of California by American Telephone and Telegraph
      * Co. or Unix System Laboratories, Inc. and are reproduced herein with
      * the permission of UNIX System Laboratories, Inc.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)systm.h     8.7 (Berkeley) 3/29/95
     * $FreeBSD: releng/5.3/sys/sys/systm.h 136588 2004-10-16 08:43:07Z cvs2svn $
     */
    
    #ifndef _SYS_SYSTM_H_
    #define _SYS_SYSTM_H_
    
    #include <machine/atomic.h>
    #include <machine/cpufunc.h>
    #include <sys/callout.h>
    #include <sys/cdefs.h>
    #include <sys/queue.h>
    #include <sys/stdint.h>         /* for people using printf mainly */
    
    extern int securelevel;         /* system security level (see init(8)) */
    extern int suser_enabled;       /* suser() is permitted to return 0 */
    
    extern int cold;                /* nonzero if we are doing a cold boot */
    extern const char *panicstr;    /* panic message */
    extern char version[];          /* system version */
    extern char copyright[];        /* system copyright */
    extern int kstack_pages;        /* number of kernel stack pages */
    extern int uarea_pages;         /* number of user struct pages */
    
    extern int nswap;               /* size of swap space */
    
    extern u_int nselcoll;          /* select collisions since boot */
    extern struct mtx sellock;      /* select lock variable */
    extern struct cv selwait;       /* select conditional variable */
    
    extern long physmem;            /* physical memory */
    
    extern struct cdev *rootdev;            /* root device */
    extern char *rootdevnames[2];   /* names of possible root devices */
    
    extern int boothowto;           /* reboot flags, from console subsystem */
    extern int bootverbose;         /* nonzero to print verbose messages */
    
    extern int maxusers;            /* system tune hint */
    
    #ifdef  INVARIANTS              /* The option is always available */
    #define KASSERT(exp,msg) do {                                           \
            if (__predict_false(!(exp)))                                    \
                    panic msg;                                              \
    } while (0)
    #else
    #define KASSERT(exp,msg)
    #endif
    
    #ifndef CTASSERT                /* Allow lint to override */
    #define CTASSERT(x)             _CTASSERT(x, __LINE__)
    #define _CTASSERT(x, y)         __CTASSERT(x, y)
    #define __CTASSERT(x, y)        typedef char __assert ## y[(x) ? 1 : -1]
    #endif
    
    /*
     * XXX the hints declarations are even more misplaced than most declarations
     * in this file, since they are needed in one file (per arch) and only used
     * in two files.
     * XXX most of these variables should be const.
     */
    extern int envmode;
    extern int hintmode;            /* 0 = off. 1 = config, 2 = fallback */
    extern int dynamic_kenv;
    extern struct sx kenv_lock;
    extern char *kern_envp;
   extern char static_env[];
   extern char static_hints[];     /* by config for now */
   
   extern char **kenvp;
   
   /*
    * General function declarations.
    */
   
   struct clockframe;
   struct malloc_type;
   struct mtx;
   struct proc;
   struct kse;
   struct socket;
   struct thread;
   struct tty;
   struct ucred;
   struct uio;
   struct _jmp_buf;
   
   int     setjmp(struct _jmp_buf *);
   void    longjmp(struct _jmp_buf *, int) __dead2;
   int     dumpstatus(vm_offset_t addr, off_t count);
   int     nullop(void);
   int     eopnotsupp(void);
   int     ureadc(int, struct uio *);
   void    hashdestroy(void *, struct malloc_type *, u_long);
   void    *hashinit(int count, struct malloc_type *type, u_long *hashmask);
   void    *phashinit(int count, struct malloc_type *type, u_long *nentries);
   
   #ifdef RESTARTABLE_PANICS
   void    panic(const char *, ...) __printflike(1, 2);
   #else
   void    panic(const char *, ...) __dead2 __printflike(1, 2);
   #endif
   
   void    cpu_boot(int);
   void    cpu_rootconf(void);
   extern uint32_t crc32_tab[];
   uint32_t crc32(const void *buf, size_t size);
   void    critical_enter(void);
   void    critical_exit(void);
   void    init_param1(void);
   void    init_param2(long physpages);
   void    init_param3(long kmempages);
   void    tablefull(const char *);
   int     kvprintf(char const *, void (*)(int, void*), void *, int,
               __va_list) __printflike(1, 0);
   void    log(int, const char *, ...) __printflike(2, 3);
   void    log_console(struct uio *);
   int     printf(const char *, ...) __printflike(1, 2);
   int     snprintf(char *, size_t, const char *, ...) __printflike(3, 4);
   int     sprintf(char *buf, const char *, ...) __printflike(2, 3);
   int     uprintf(const char *, ...) __printflike(1, 2);
   int     vprintf(const char *, __va_list) __printflike(1, 0);
   int     vsnprintf(char *, size_t, const char *, __va_list) __printflike(3, 0);
   int     vsnrprintf(char *, size_t, int, const char *, __va_list) __printflike(4, 0); 
   int     vsprintf(char *buf, const char *, __va_list) __printflike(2, 0);
   int     ttyprintf(struct tty *, const char *, ...) __printflike(2, 3);
   int     sscanf(const char *, char const *, ...) __nonnull(1) __nonnull(2);
   int     vsscanf(const char *, char const *, __va_list) __nonnull(1) __nonnull(2);
   long    strtol(const char *, char **, int) __nonnull(1);
   u_long  strtoul(const char *, char **, int) __nonnull(1);
   quad_t  strtoq(const char *, char **, int) __nonnull(1);
   u_quad_t strtouq(const char *, char **, int) __nonnull(1);
   void    tprintf(struct proc *p, int pri, const char *, ...) __printflike(3, 4);
   void    hexdump(void *ptr, int length, const char *hdr, int flags);
   #define HD_COLUMN_MASK  0xff
   #define HD_DELIM_MASK   0xff00
   #define HD_OMIT_COUNT   (1 << 16)
   #define HD_OMIT_HEX     (1 << 17)
   #define HD_OMIT_CHARS   (1 << 18)
   
   #define ovbcopy(f, t, l) bcopy((f), (t), (l))
   void    bcopy(const void *from, void *to, size_t len) __nonnull(1) __nonnull(2);
   void    bzero(void *buf, size_t len) __nonnull(1);
   
   void    *memcpy(void *to, const void *from, size_t len) __nonnull(1) __nonnull(2);
   
   int     copystr(const void * __restrict kfaddr, void * __restrict kdaddr,
               size_t len, size_t * __restrict lencopied)
               __nonnull(1) __nonnull(2);
   int     copyinstr(const void * __restrict udaddr, void * __restrict kaddr,
               size_t len, size_t * __restrict lencopied)
               __nonnull(1) __nonnull(2);
   int     copyin(const void * __restrict udaddr, void * __restrict kaddr,
               size_t len) __nonnull(1) __nonnull(2);
   int     copyout(const void * __restrict kaddr, void * __restrict udaddr,
               size_t len) __nonnull(1) __nonnull(2);
   
   int     fubyte(const void *base);
   long    fuword(const void *base);
   int     fuword16(void *base);
   int32_t fuword32(const void *base);
   int64_t fuword64(const void *base);
   int     subyte(void *base, int byte);
   int     suword(void *base, long word);
   int     suword16(void *base, int word);
   int     suword32(void *base, int32_t word);
   int     suword64(void *base, int64_t word);
   intptr_t casuptr(intptr_t *p, intptr_t old, intptr_t new);
   
   void    realitexpire(void *);
   
   void    hardclock(struct clockframe *frame);
   void    hardclock_process(struct clockframe *frame);
   void    softclock(void *);
   void    statclock(struct clockframe *frame);
   void    profclock(struct clockframe *frame);
   
   void    startprofclock(struct proc *);
   void    stopprofclock(struct proc *);
   void    cpu_startprofclock(void);
   void    cpu_stopprofclock(void);
   
   /* flags for suser() and suser_cred() */
   #define SUSER_ALLOWJAIL 1
   #define SUSER_RUID      2
   
   int     suser(struct thread *td);
   int     suser_cred(struct ucred *cred, int flag);
   int     cr_cansee(struct ucred *u1, struct ucred *u2);
   int     cr_canseesocket(struct ucred *cred, struct socket *so);
   
   char    *getenv(const char *name);
   void    freeenv(char *env);
   int     getenv_int(const char *name, int *data);
   int     getenv_string(const char *name, char *data, int size);
   int     getenv_quad(const char *name, quad_t *data);
   int     setenv(const char *name, const char *value);
   int     unsetenv(const char *name);
   int     testenv(const char *name);
   
   #ifdef APM_FIXUP_CALLTODO 
   struct timeval;
   void    adjust_timeout_calltodo(struct timeval *time_change); 
   #endif /* APM_FIXUP_CALLTODO */ 
   
   #include <sys/libkern.h>
   
   /* Initialize the world */
   void    consinit(void);
   void    cpu_initclocks(void);
   void    usrinfoinit(void);
   
   /* Finalize the world. */
   void    shutdown_nice(int);
   
   /*
    * Kernel to clock driver interface.
    */
   void    inittodr(time_t base);
   void    resettodr(void);
   void    startrtclock(void);
   
   /* Timeouts */
   typedef void timeout_t(void *); /* timeout function type */
   #define CALLOUT_HANDLE_INITIALIZER(handle)      \
           { NULL }
   
   void    callout_handle_init(struct callout_handle *);
   struct  callout_handle timeout(timeout_t *, void *, int);
   void    untimeout(timeout_t *, void *, struct callout_handle);
   caddr_t kern_timeout_callwheel_alloc(caddr_t v);
   void    kern_timeout_callwheel_init(void);
   
   /* Stubs for obsolete functions that used to be for interrupt  management */
   static __inline void            spl0(void)              { return; }
   static __inline intrmask_t      splbio(void)            { return 0; }
   static __inline intrmask_t      splcam(void)            { return 0; }
   static __inline intrmask_t      splclock(void)          { return 0; }
   static __inline intrmask_t      splhigh(void)           { return 0; }
   static __inline intrmask_t      splimp(void)            { return 0; }
   static __inline intrmask_t      splnet(void)            { return 0; }
   static __inline intrmask_t      splsoftcam(void)        { return 0; }
   static __inline intrmask_t      splsoftclock(void)      { return 0; }
   static __inline intrmask_t      splsofttty(void)        { return 0; }
   static __inline intrmask_t      splsoftvm(void)         { return 0; }
   static __inline intrmask_t      splsofttq(void)         { return 0; }
   static __inline intrmask_t      splstatclock(void)      { return 0; }
   static __inline intrmask_t      spltty(void)            { return 0; }
   static __inline intrmask_t      splvm(void)             { return 0; }
   static __inline void            splx(intrmask_t ipl __unused)   { return; }
   
   /*
    * Various callout lists.
    */
   
   /*
    * Not exactly a callout LIST, but a callout entry.
    * Allow an external module to define a hardware watchdog tickler.
    * Normally a process would do this, but there are times when the
    * kernel needs to be able to hold off the watchdog, when the process
    * is not active, e.g., when dumping core.
    */
   typedef void (*watchdog_tickle_fn)(void);
   
   extern watchdog_tickle_fn       wdog_tickler;
   
   /* 
    * Common `proc' functions are declared here so that proc.h can be included
    * less often.
    */
   int     msleep(void *chan, struct mtx *mtx, int pri, const char *wmesg,
               int timo);
   #define tsleep(chan, pri, wmesg, timo)  msleep(chan, NULL, pri, wmesg, timo)
   void    wakeup(void *chan) __nonnull(1);
   void    wakeup_one(void *chan) __nonnull(1);
   
   /*
    * Common `struct cdev *' stuff are declared here to avoid #include poisoning
    */
   
   int major(struct cdev *x);
   int minor(struct cdev *x);
   dev_t dev2udev(struct cdev *x);
   struct cdev *findcdev(dev_t x);
   int uminor(dev_t dev);
   int umajor(dev_t dev);
   
   /* XXX: Should be void nanodelay(u_int nsec); */
   void    DELAY(int usec);
   
   #endif /* !_SYS_SYSTM_H_ */

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