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


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

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

Version: -  FREEBSD  -  FREEBSD-13-STABLE  -  FREEBSD-13-0  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  l41  -  OPENBSD  -  linux-2.6  -  MK84  -  PLAN9  -  xnu-8792 
SearchContext: -  none  -  3  -  10 

    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: releng/6.4/sys/sys/systm.h 170945 2007-06-18 22:44:59Z jhb $
   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 extern int suser_enabled;       /* suser() is permitted to return 0 */
   50 
   51 extern int cold;                /* nonzero if we are doing a cold boot */
   52 extern int rebooting;           /* boot() has been called. */
   53 extern const char *panicstr;    /* panic message */
   54 extern char version[];          /* system version */
   55 extern char copyright[];        /* system copyright */
   56 extern int kstack_pages;        /* number of kernel stack pages */
   57 
   58 extern int nswap;               /* size of swap space */
   59 
   60 extern u_int nselcoll;          /* select collisions since boot */
   61 extern struct mtx sellock;      /* select lock variable */
   62 extern struct cv selwait;       /* select conditional variable */
   63 
   64 extern long physmem;            /* physical memory */
   65 extern long realmem;            /* 'real' memory */
   66 
   67 extern char *rootdevnames[2];   /* names of possible root devices */
   68 
   69 extern int boothowto;           /* reboot flags, from console subsystem */
   70 extern int bootverbose;         /* nonzero to print verbose messages */
   71 
   72 extern int maxusers;            /* system tune hint */
   73 
   74 #ifdef  INVARIANTS              /* The option is always available */
   75 #define KASSERT(exp,msg) do {                                           \
   76         if (__predict_false(!(exp)))                                    \
   77                 panic msg;                                              \
   78 } while (0)
   79 #define VNASSERT(exp, vp, msg) do {                                     \
   80         if (__predict_false(!(exp))) {                                  \
   81                 vn_printf(vp, "VNASSERT failed\n");             \
   82                 panic msg;                                              \
   83         }                                                               \
   84 } while (0)
   85 #else
   86 #define KASSERT(exp,msg)
   87 #define VNASSERT(exp, vp, msg)
   88 #endif
   89 
   90 #ifndef CTASSERT                /* Allow lint to override */
   91 #define CTASSERT(x)             _CTASSERT(x, __LINE__)
   92 #define _CTASSERT(x, y)         __CTASSERT(x, y)
   93 #define __CTASSERT(x, y)        typedef char __assert ## y[(x) ? 1 : -1]
   94 #endif
   95 
   96 /*
   97  * XXX the hints declarations are even more misplaced than most declarations
   98  * in this file, since they are needed in one file (per arch) and only used
   99  * in two files.
  100  * XXX most of these variables should be const.
  101  */
  102 extern int envmode;
  103 extern int hintmode;            /* 0 = off. 1 = config, 2 = fallback */
  104 extern int dynamic_kenv;
  105 extern struct sx kenv_lock;
  106 extern char *kern_envp;
  107 extern char static_env[];
  108 extern char static_hints[];     /* by config for now */
  109 
  110 extern char **kenvp;
  111 
  112 /*
  113  * General function declarations.
  114  */
  115 
  116 struct clockframe;
  117 struct malloc_type;
  118 struct mtx;
  119 struct proc;
  120 struct kse;
  121 struct socket;
  122 struct thread;
  123 struct tty;
  124 struct ucred;
  125 struct uio;
  126 struct _jmp_buf;
  127 
  128 int     setjmp(struct _jmp_buf *);
  129 void    longjmp(struct _jmp_buf *, int) __dead2;
  130 int     dumpstatus(vm_offset_t addr, off_t count);
  131 int     nullop(void);
  132 int     eopnotsupp(void);
  133 int     ureadc(int, struct uio *);
  134 void    hashdestroy(void *, struct malloc_type *, u_long);
  135 void    *hashinit(int count, struct malloc_type *type, u_long *hashmask);
  136 void    *phashinit(int count, struct malloc_type *type, u_long *nentries);
  137 void    g_waitidle(void);
  138 
  139 #ifdef RESTARTABLE_PANICS
  140 void    panic(const char *, ...) __printflike(1, 2);
  141 #else
  142 void    panic(const char *, ...) __dead2 __printflike(1, 2);
  143 #endif
  144 
  145 void    cpu_boot(int);
  146 void    cpu_rootconf(void);
  147 void    critical_enter(void);
  148 void    critical_exit(void);
  149 void    init_param1(void);
  150 void    init_param2(long physpages);
  151 void    init_param3(long kmempages);
  152 void    tablefull(const char *);
  153 int     kvprintf(char const *, void (*)(int, void*), void *, int,
  154             __va_list) __printflike(1, 0);
  155 void    log(int, const char *, ...) __printflike(2, 3);
  156 void    log_console(struct uio *);
  157 int     printf(const char *, ...) __printflike(1, 2);
  158 int     snprintf(char *, size_t, const char *, ...) __printflike(3, 4);
  159 int     sprintf(char *buf, const char *, ...) __printflike(2, 3);
  160 int     uprintf(const char *, ...) __printflike(1, 2);
  161 int     vprintf(const char *, __va_list) __printflike(1, 0);
  162 int     vsnprintf(char *, size_t, const char *, __va_list) __printflike(3, 0);
  163 int     vsnrprintf(char *, size_t, int, const char *, __va_list) __printflike(4, 0);
  164 int     vsprintf(char *buf, const char *, __va_list) __printflike(2, 0);
  165 int     ttyprintf(struct tty *, const char *, ...) __printflike(2, 3);
  166 int     sscanf(const char *, char const *, ...) __nonnull(1) __nonnull(2);
  167 int     vsscanf(const char *, char const *, __va_list) __nonnull(1) __nonnull(2);
  168 long    strtol(const char *, char **, int) __nonnull(1);
  169 u_long  strtoul(const char *, char **, int) __nonnull(1);
  170 quad_t  strtoq(const char *, char **, int) __nonnull(1);
  171 u_quad_t strtouq(const char *, char **, int) __nonnull(1);
  172 void    tprintf(struct proc *p, int pri, const char *, ...) __printflike(3, 4);
  173 void    hexdump(const void *ptr, int length, const char *hdr, int flags);
  174 #define HD_COLUMN_MASK  0xff
  175 #define HD_DELIM_MASK   0xff00
  176 #define HD_OMIT_COUNT   (1 << 16)
  177 #define HD_OMIT_HEX     (1 << 17)
  178 #define HD_OMIT_CHARS   (1 << 18)
  179 
  180 #define ovbcopy(f, t, l) bcopy((f), (t), (l))
  181 void    bcopy(const void *from, void *to, size_t len) __nonnull(1) __nonnull(2);
  182 void    bzero(void *buf, size_t len) __nonnull(1);
  183 
  184 void    *memcpy(void *to, const void *from, size_t len) __nonnull(1) __nonnull(2);
  185 
  186 int     copystr(const void * __restrict kfaddr, void * __restrict kdaddr,
  187             size_t len, size_t * __restrict lencopied)
  188             __nonnull(1) __nonnull(2);
  189 int     copyinstr(const void * __restrict udaddr, void * __restrict kaddr,
  190             size_t len, size_t * __restrict lencopied)
  191             __nonnull(1) __nonnull(2);
  192 int     copyin(const void * __restrict udaddr, void * __restrict kaddr,
  193             size_t len) __nonnull(1) __nonnull(2);
  194 int     copyout(const void * __restrict kaddr, void * __restrict udaddr,
  195             size_t len) __nonnull(1) __nonnull(2);
  196 
  197 int     fubyte(const void *base);
  198 long    fuword(const void *base);
  199 int     fuword16(void *base);
  200 int32_t fuword32(const void *base);
  201 int64_t fuword64(const void *base);
  202 int     subyte(void *base, int byte);
  203 int     suword(void *base, long word);
  204 int     suword16(void *base, int word);
  205 int     suword32(void *base, int32_t word);
  206 int     suword64(void *base, int64_t word);
  207 int32_t casuword32(volatile uint32_t *base, uint32_t oldval, uint32_t newval);
  208 intptr_t casuptr(intptr_t *p, intptr_t old, intptr_t new);
  209 
  210 void    realitexpire(void *);
  211 
  212 void    hardclock(struct clockframe *frame);
  213 void    hardclock_process(struct clockframe *frame);
  214 void    softclock(void *);
  215 void    statclock(struct clockframe *frame);
  216 void    profclock(struct clockframe *frame);
  217 
  218 void    startprofclock(struct proc *);
  219 void    stopprofclock(struct proc *);
  220 void    cpu_startprofclock(void);
  221 void    cpu_stopprofclock(void);
  222 
  223 /* flags for suser() and suser_cred() */
  224 #define SUSER_ALLOWJAIL 1
  225 #define SUSER_RUID      2
  226 
  227 int     suser(struct thread *td);
  228 int     suser_cred(struct ucred *cred, int flag);
  229 int     cr_cansee(struct ucred *u1, struct ucred *u2);
  230 int     cr_canseesocket(struct ucred *cred, struct socket *so);
  231 
  232 char    *getenv(const char *name);
  233 void    freeenv(char *env);
  234 int     getenv_int(const char *name, int *data);
  235 long    getenv_long(const char *name, long *data);
  236 unsigned long getenv_ulong(const char *name, unsigned long *data);
  237 int     getenv_string(const char *name, char *data, int size);
  238 int     getenv_quad(const char *name, quad_t *data);
  239 int     setenv(const char *name, const char *value);
  240 int     unsetenv(const char *name);
  241 int     testenv(const char *name);
  242 
  243 #ifdef APM_FIXUP_CALLTODO
  244 struct timeval;
  245 void    adjust_timeout_calltodo(struct timeval *time_change);
  246 #endif /* APM_FIXUP_CALLTODO */
  247 
  248 #include <sys/libkern.h>
  249 
  250 /* Initialize the world */
  251 void    consinit(void);
  252 void    cpu_initclocks(void);
  253 void    usrinfoinit(void);
  254 
  255 /* Finalize the world. */
  256 void    shutdown_nice(int);
  257 
  258 /*
  259  * Kernel to clock driver interface.
  260  */
  261 void    inittodr(time_t base);
  262 void    resettodr(void);
  263 void    startrtclock(void);
  264 
  265 /* Timeouts */
  266 typedef void timeout_t(void *); /* timeout function type */
  267 #define CALLOUT_HANDLE_INITIALIZER(handle)      \
  268         { NULL }
  269 
  270 void    callout_handle_init(struct callout_handle *);
  271 struct  callout_handle timeout(timeout_t *, void *, int);
  272 void    untimeout(timeout_t *, void *, struct callout_handle);
  273 caddr_t kern_timeout_callwheel_alloc(caddr_t v);
  274 void    kern_timeout_callwheel_init(void);
  275 
  276 /* Stubs for obsolete functions that used to be for interrupt  management */
  277 static __inline void            spl0(void)              { return; }
  278 static __inline intrmask_t      splbio(void)            { return 0; }
  279 static __inline intrmask_t      splcam(void)            { return 0; }
  280 static __inline intrmask_t      splclock(void)          { return 0; }
  281 static __inline intrmask_t      splhigh(void)           { return 0; }
  282 static __inline intrmask_t      splimp(void)            { return 0; }
  283 static __inline intrmask_t      splnet(void)            { return 0; }
  284 static __inline intrmask_t      splsoftcam(void)        { return 0; }
  285 static __inline intrmask_t      splsoftclock(void)      { return 0; }
  286 static __inline intrmask_t      splsofttty(void)        { return 0; }
  287 static __inline intrmask_t      splsoftvm(void)         { return 0; }
  288 static __inline intrmask_t      splsofttq(void)         { return 0; }
  289 static __inline intrmask_t      splstatclock(void)      { return 0; }
  290 static __inline intrmask_t      spltty(void)            { return 0; }
  291 static __inline intrmask_t      splvm(void)             { return 0; }
  292 static __inline void            splx(intrmask_t ipl __unused)   { return; }
  293 
  294 /*
  295  * Common `proc' functions are declared here so that proc.h can be included
  296  * less often.
  297  */
  298 int     msleep(void *chan, struct mtx *mtx, int pri, const char *wmesg,
  299             int timo);
  300 int     msleep_spin(void *chan, struct mtx *mtx, const char *wmesg, int timo);
  301 #define tsleep(chan, pri, wmesg, timo)  msleep(chan, NULL, pri, wmesg, timo)
  302 void    wakeup(void *chan) __nonnull(1);
  303 void    wakeup_one(void *chan) __nonnull(1);
  304 
  305 /*
  306  * Common `struct cdev *' stuff are declared here to avoid #include poisoning
  307  */
  308 
  309 struct cdev;
  310 int minor(struct cdev *x);
  311 dev_t dev2udev(struct cdev *x);
  312 int uminor(dev_t dev);
  313 int umajor(dev_t dev);
  314 const char *devtoname(struct cdev *cdev);
  315 
  316 /* XXX: Should be void nanodelay(u_int nsec); */
  317 void    DELAY(int usec);
  318 
  319 /* Root mount holdback API */
  320 struct root_hold_token;
  321 
  322 struct root_hold_token *root_mount_hold(const char *identifier);
  323 void root_mount_rel(struct root_hold_token *h);
  324 
  325 
  326 /*
  327  * Unit number allocation API. (kern/subr_unit.c)
  328  */
  329 struct unrhdr;
  330 struct unrhdr *new_unrhdr(int low, int high, struct mtx *mutex);
  331 void delete_unrhdr(struct unrhdr *uh);
  332 int alloc_unr(struct unrhdr *uh);
  333 int alloc_unrl(struct unrhdr *uh);
  334 void free_unr(struct unrhdr *uh, u_int item);
  335 
  336 /*
  337  * This is about as magic as it gets.  fortune(1) has got similar code
  338  * for reversing bits in a word.  Who thinks up this stuff??
  339  *
  340  * Yes, it does appear to be consistently faster than:
  341  * while (i = ffs(m)) {
  342  *      m >>= i;
  343  *      bits++;
  344  * }
  345  * and
  346  * while (lsb = (m & -m)) {     // This is magic too
  347  *      m &= ~lsb;              // or: m ^= lsb
  348  *      bits++;
  349  * }
  350  * Both of these latter forms do some very strange things on gcc-3.1 with
  351  * -mcpu=pentiumpro and/or -march=pentiumpro and/or -O or -O2.
  352  * There is probably an SSE or MMX popcnt instruction.
  353  *
  354  * I wonder if this should be in libkern?
  355  *
  356  * XXX Stop the presses!  Another one:
  357  * static __inline u_int32_t
  358  * popcnt1(u_int32_t v)
  359  * {
  360  *      v -= ((v >> 1) & 0x55555555);
  361  *      v = (v & 0x33333333) + ((v >> 2) & 0x33333333);
  362  *      v = (v + (v >> 4)) & 0x0F0F0F0F;
  363  *      return (v * 0x01010101) >> 24;
  364  * }
  365  * The downside is that it has a multiply.  With a pentium3 with
  366  * -mcpu=pentiumpro and -march=pentiumpro then gcc-3.1 will use
  367  * an imull, and in that case it is faster.  In most other cases
  368  * it appears slightly slower.
  369  *
  370  * Another variant (also from fortune):
  371  * #define BITCOUNT(x) (((BX_(x)+(BX_(x)>>4)) & 0x0F0F0F0F) % 255)
  372  * #define  BX_(x)     ((x) - (((x)>>1)&0x77777777)            \
  373  *                          - (((x)>>2)&0x33333333)            \
  374  *                          - (((x)>>3)&0x11111111))
  375  */
  376 static __inline uint32_t
  377 bitcount32(uint32_t x)
  378 {
  379 
  380         x = (x & 0x55555555) + ((x & 0xaaaaaaaa) >> 1);
  381         x = (x & 0x33333333) + ((x & 0xcccccccc) >> 2);
  382         x = (x & 0x0f0f0f0f) + ((x & 0xf0f0f0f0) >> 4);
  383         x = (x & 0x00ff00ff) + ((x & 0xff00ff00) >> 8);
  384         x = (x & 0x0000ffff) + ((x & 0xffff0000) >> 16);
  385         return (x);
  386 }
  387 
  388 #endif /* !_SYS_SYSTM_H_ */

Cache object: 648e93737f586937274455369260d792


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.