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: releng/8.4/sys/sys/systm.h 247875 2013-03-06 09:16:01Z avg $
   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 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 compiler_version[]; /* compiler version */
   53 extern char copyright[];        /* system copyright */
   54 extern int kstack_pages;        /* number of kernel stack pages */
   55 
   56 extern int nswap;               /* size of swap space */
   57 
   58 extern u_long pagesizes[];      /* supported page sizes */
   59 extern long physmem;            /* physical memory */
   60 extern long realmem;            /* 'real' memory */
   61 
   62 extern char *rootdevnames[2];   /* names of possible root devices */
   63 
   64 extern int boothowto;           /* reboot flags, from console subsystem */
   65 extern int bootverbose;         /* nonzero to print verbose messages */
   66 
   67 extern int maxusers;            /* system tune hint */
   68 extern int ngroups_max;         /* max # of supplemental groups */
   69 extern int vm_guest;            /* Running as virtual machine guest? */
   70 
   71 /*
   72  * Detected virtual machine guest types. The intention is to expand
   73  * and/or add to the VM_GUEST_VM type if specific VM functionality is
   74  * ever implemented (e.g. vendor-specific paravirtualization features).
   75  */
   76 enum VM_GUEST { VM_GUEST_NO = 0, VM_GUEST_VM, VM_GUEST_XEN };
   77 
   78 #ifdef  INVARIANTS              /* The option is always available */
   79 #define KASSERT(exp,msg) do {                                           \
   80         if (__predict_false(!(exp)))                                    \
   81                 panic msg;                                              \
   82 } while (0)
   83 #define VNASSERT(exp, vp, msg) do {                                     \
   84         if (__predict_false(!(exp))) {                                  \
   85                 vn_printf(vp, "VNASSERT failed\n");                     \
   86                 panic msg;                                              \
   87         }                                                               \
   88 } while (0)
   89 #else
   90 #define KASSERT(exp,msg) do { \
   91 } while (0)
   92 
   93 #define VNASSERT(exp, vp, msg) do { \
   94 } while (0)
   95 #endif
   96 
   97 #ifndef CTASSERT                /* Allow lint to override */
   98 #define CTASSERT(x)             _CTASSERT(x, __LINE__)
   99 #define _CTASSERT(x, y)         __CTASSERT(x, y)
  100 #define __CTASSERT(x, y)        typedef char __assert ## y[(x) ? 1 : -1]
  101 #endif
  102 
  103 /*
  104  * Assert that a pointer can be loaded from memory atomically.
  105  *
  106  * This assertion enforces stronger alignment than necessary.  For example,
  107  * on some architectures, atomicity for unaligned loads will depend on
  108  * whether or not the load spans multiple cache lines.
  109  */
  110 #define ASSERT_ATOMIC_LOAD_PTR(var, msg)                                \
  111         KASSERT(sizeof(var) == sizeof(void *) &&                        \
  112             ((uintptr_t)&(var) & (sizeof(void *) - 1)) == 0, msg)
  113 
  114 /*
  115  * If we have already panic'd and this is the thread that called
  116  * panic(), then don't block on any mutexes but silently succeed.
  117  * Otherwise, the kernel will deadlock since the scheduler isn't
  118  * going to run the thread that holds any lock we need.
  119  */
  120 #define SCHEDULER_STOPPED() __predict_false(curthread->td_stopsched)
  121 
  122 /*
  123  * XXX the hints declarations are even more misplaced than most declarations
  124  * in this file, since they are needed in one file (per arch) and only used
  125  * in two files.
  126  * XXX most of these variables should be const.
  127  */
  128 extern int osreldate;
  129 extern int envmode;
  130 extern int hintmode;            /* 0 = off. 1 = config, 2 = fallback */
  131 extern int dynamic_kenv;
  132 extern struct mtx kenv_lock;
  133 extern char *kern_envp;
  134 extern char static_env[];
  135 extern char static_hints[];     /* by config for now */
  136 
  137 extern char **kenvp;
  138 
  139 /*
  140  * General function declarations.
  141  */
  142 
  143 struct inpcb;
  144 struct lock_object;
  145 struct malloc_type;
  146 struct mtx;
  147 struct proc;
  148 struct socket;
  149 struct thread;
  150 struct tty;
  151 struct ucred;
  152 struct uio;
  153 struct _jmp_buf;
  154 
  155 int     setjmp(struct _jmp_buf *);
  156 void    longjmp(struct _jmp_buf *, int) __dead2;
  157 int     dumpstatus(vm_offset_t addr, off_t count);
  158 int     nullop(void);
  159 int     eopnotsupp(void);
  160 int     ureadc(int, struct uio *);
  161 void    hashdestroy(void *, struct malloc_type *, u_long);
  162 void    *hashinit(int count, struct malloc_type *type, u_long *hashmask);
  163 void    *hashinit_flags(int count, struct malloc_type *type,
  164     u_long *hashmask, int flags);
  165 #define HASH_NOWAIT     0x00000001
  166 #define HASH_WAITOK     0x00000002
  167 
  168 void    *phashinit(int count, struct malloc_type *type, u_long *nentries);
  169 void    g_waitidle(void);
  170 
  171 #ifdef RESTARTABLE_PANICS
  172 void    panic(const char *, ...) __printflike(1, 2);
  173 #else
  174 void    panic(const char *, ...) __dead2 __printflike(1, 2);
  175 #endif
  176 
  177 void    cpu_boot(int);
  178 void    cpu_flush_dcache(void *, size_t);
  179 void    cpu_rootconf(void);
  180 void    critical_enter(void);
  181 void    critical_exit(void);
  182 void    init_param1(void);
  183 void    init_param2(long physpages);
  184 void    init_param3(long kmempages);
  185 void    tablefull(const char *);
  186 int     kvprintf(char const *, void (*)(int, void*), void *, int,
  187             __va_list) __printflike(1, 0);
  188 void    log(int, const char *, ...) __printflike(2, 3);
  189 void    log_console(struct uio *);
  190 int     printf(const char *, ...) __printflike(1, 2);
  191 int     snprintf(char *, size_t, const char *, ...) __printflike(3, 4);
  192 int     sprintf(char *buf, const char *, ...) __printflike(2, 3);
  193 int     uprintf(const char *, ...) __printflike(1, 2);
  194 int     vprintf(const char *, __va_list) __printflike(1, 0);
  195 int     vsnprintf(char *, size_t, const char *, __va_list) __printflike(3, 0);
  196 int     vsnrprintf(char *, size_t, int, const char *, __va_list) __printflike(4, 0);
  197 int     vsprintf(char *buf, const char *, __va_list) __printflike(2, 0);
  198 int     ttyprintf(struct tty *, const char *, ...) __printflike(2, 3);
  199 int     sscanf(const char *, char const *, ...) __nonnull(1) __nonnull(2);
  200 int     vsscanf(const char *, char const *, __va_list) __nonnull(1) __nonnull(2);
  201 long    strtol(const char *, char **, int) __nonnull(1);
  202 u_long  strtoul(const char *, char **, int) __nonnull(1);
  203 quad_t  strtoq(const char *, char **, int) __nonnull(1);
  204 u_quad_t strtouq(const char *, char **, int) __nonnull(1);
  205 void    tprintf(struct proc *p, int pri, const char *, ...) __printflike(3, 4);
  206 void    hexdump(const void *ptr, int length, const char *hdr, int flags);
  207 #define HD_COLUMN_MASK  0xff
  208 #define HD_DELIM_MASK   0xff00
  209 #define HD_OMIT_COUNT   (1 << 16)
  210 #define HD_OMIT_HEX     (1 << 17)
  211 #define HD_OMIT_CHARS   (1 << 18)
  212 
  213 #define ovbcopy(f, t, l) bcopy((f), (t), (l))
  214 void    bcopy(const void *from, void *to, size_t len) __nonnull(1) __nonnull(2);
  215 void    bzero(void *buf, size_t len) __nonnull(1);
  216 
  217 void    *memcpy(void *to, const void *from, size_t len) __nonnull(1) __nonnull(2);
  218 void    *memmove(void *dest, const void *src, size_t n) __nonnull(1) __nonnull(2);
  219 
  220 int     copystr(const void * __restrict kfaddr, void * __restrict kdaddr,
  221             size_t len, size_t * __restrict lencopied)
  222             __nonnull(1) __nonnull(2);
  223 int     copyinstr(const void * __restrict udaddr, void * __restrict kaddr,
  224             size_t len, size_t * __restrict lencopied)
  225             __nonnull(1) __nonnull(2);
  226 int     copyin(const void * __restrict udaddr, void * __restrict kaddr,
  227             size_t len) __nonnull(1) __nonnull(2);
  228 int     copyin_nofault(const void * __restrict udaddr, void * __restrict kaddr,
  229             size_t len) __nonnull(1) __nonnull(2);
  230 int     copyout(const void * __restrict kaddr, void * __restrict udaddr,
  231             size_t len) __nonnull(1) __nonnull(2);
  232 int     copyout_nofault(const void * __restrict kaddr, void * __restrict udaddr,
  233             size_t len) __nonnull(1) __nonnull(2);
  234 
  235 int     fubyte(const void *base);
  236 long    fuword(const void *base);
  237 int     fuword16(void *base);
  238 int32_t fuword32(const void *base);
  239 int64_t fuword64(const void *base);
  240 int     subyte(void *base, int byte);
  241 int     suword(void *base, long word);
  242 int     suword16(void *base, int word);
  243 int     suword32(void *base, int32_t word);
  244 int     suword64(void *base, int64_t word);
  245 uint32_t casuword32(volatile uint32_t *base, uint32_t oldval, uint32_t newval);
  246 u_long   casuword(volatile u_long *p, u_long oldval, u_long newval);
  247 
  248 void    realitexpire(void *);
  249 
  250 int     sysbeep(int hertz, int period);
  251 
  252 void    hardclock(int usermode, uintfptr_t pc);
  253 void    hardclock_cpu(int usermode);
  254 void    softclock(void *);
  255 void    statclock(int usermode);
  256 void    profclock(int usermode, uintfptr_t pc);
  257 
  258 void    startprofclock(struct proc *);
  259 void    stopprofclock(struct proc *);
  260 void    cpu_startprofclock(void);
  261 void    cpu_stopprofclock(void);
  262 
  263 int     cr_cansee(struct ucred *u1, struct ucred *u2);
  264 int     cr_canseesocket(struct ucred *cred, struct socket *so);
  265 int     cr_canseeinpcb(struct ucred *cred, struct inpcb *inp);
  266 
  267 char    *getenv(const char *name);
  268 void    freeenv(char *env);
  269 int     getenv_int(const char *name, int *data);
  270 int     getenv_uint(const char *name, unsigned int *data);
  271 int     getenv_long(const char *name, long *data);
  272 int     getenv_ulong(const char *name, unsigned long *data);
  273 int     getenv_string(const char *name, char *data, int size);
  274 int     getenv_quad(const char *name, quad_t *data);
  275 int     setenv(const char *name, const char *value);
  276 int     unsetenv(const char *name);
  277 int     testenv(const char *name);
  278 
  279 typedef uint64_t (cpu_tick_f)(void);
  280 void set_cputicker(cpu_tick_f *func, uint64_t freq, unsigned var);
  281 extern cpu_tick_f *cpu_ticks;
  282 uint64_t cpu_tickrate(void);
  283 uint64_t cputick2usec(uint64_t tick);
  284 
  285 #ifdef APM_FIXUP_CALLTODO
  286 struct timeval;
  287 void    adjust_timeout_calltodo(struct timeval *time_change);
  288 #endif /* APM_FIXUP_CALLTODO */
  289 
  290 #include <sys/libkern.h>
  291 
  292 /* Initialize the world */
  293 void    consinit(void);
  294 void    cpu_initclocks(void);
  295 void    usrinfoinit(void);
  296 
  297 /* Finalize the world */
  298 void    shutdown_nice(int);
  299 
  300 /* Timeouts */
  301 typedef void timeout_t(void *); /* timeout function type */
  302 #define CALLOUT_HANDLE_INITIALIZER(handle)      \
  303         { NULL }
  304 
  305 void    callout_handle_init(struct callout_handle *);
  306 struct  callout_handle timeout(timeout_t *, void *, int);
  307 void    untimeout(timeout_t *, void *, struct callout_handle);
  308 caddr_t kern_timeout_callwheel_alloc(caddr_t v);
  309 void    kern_timeout_callwheel_init(void);
  310 
  311 /* Stubs for obsolete functions that used to be for interrupt management */
  312 static __inline void            spl0(void)              { return; }
  313 static __inline intrmask_t      splbio(void)            { return 0; }
  314 static __inline intrmask_t      splcam(void)            { return 0; }
  315 static __inline intrmask_t      splclock(void)          { return 0; }
  316 static __inline intrmask_t      splhigh(void)           { return 0; }
  317 static __inline intrmask_t      splimp(void)            { return 0; }
  318 static __inline intrmask_t      splnet(void)            { return 0; }
  319 static __inline intrmask_t      splsoftcam(void)        { return 0; }
  320 static __inline intrmask_t      splsoftclock(void)      { return 0; }
  321 static __inline intrmask_t      splsofttty(void)        { return 0; }
  322 static __inline intrmask_t      splsoftvm(void)         { return 0; }
  323 static __inline intrmask_t      splsofttq(void)         { return 0; }
  324 static __inline intrmask_t      splstatclock(void)      { return 0; }
  325 static __inline intrmask_t      spltty(void)            { return 0; }
  326 static __inline intrmask_t      splvm(void)             { return 0; }
  327 static __inline void            splx(intrmask_t ipl __unused)   { return; }
  328 
  329 /*
  330  * Common `proc' functions are declared here so that proc.h can be included
  331  * less often.
  332  */
  333 int     _sleep(void *chan, struct lock_object *lock, int pri, const char *wmesg,
  334             int timo) __nonnull(1);
  335 #define msleep(chan, mtx, pri, wmesg, timo)                             \
  336         _sleep((chan), &(mtx)->lock_object, (pri), (wmesg), (timo))
  337 int     msleep_spin(void *chan, struct mtx *mtx, const char *wmesg, int timo)
  338             __nonnull(1);
  339 int     pause(const char *wmesg, int timo);
  340 #define tsleep(chan, pri, wmesg, timo)                                  \
  341         _sleep((chan), NULL, (pri), (wmesg), (timo))
  342 void    wakeup(void *chan) __nonnull(1);
  343 void    wakeup_one(void *chan) __nonnull(1);
  344 
  345 /*
  346  * Common `struct cdev *' stuff are declared here to avoid #include poisoning
  347  */
  348 
  349 struct cdev;
  350 dev_t dev2udev(struct cdev *x);
  351 const char *devtoname(struct cdev *cdev);
  352 
  353 int poll_no_poll(int events);
  354 
  355 /* XXX: Should be void nanodelay(u_int nsec); */
  356 void    DELAY(int usec);
  357 
  358 /* Root mount holdback API */
  359 struct root_hold_token;
  360 
  361 struct root_hold_token *root_mount_hold(const char *identifier);
  362 void root_mount_rel(struct root_hold_token *h);
  363 void root_mount_wait(void);
  364 int root_mounted(void);
  365 
  366 
  367 /*
  368  * Unit number allocation API. (kern/subr_unit.c)
  369  */
  370 struct unrhdr;
  371 struct unrhdr *new_unrhdr(int low, int high, struct mtx *mutex);
  372 void delete_unrhdr(struct unrhdr *uh);
  373 void clean_unrhdr(struct unrhdr *uh);
  374 void clean_unrhdrl(struct unrhdr *uh);
  375 int alloc_unr(struct unrhdr *uh);
  376 int alloc_unr_specific(struct unrhdr *uh, u_int item);
  377 int alloc_unrl(struct unrhdr *uh);
  378 void free_unr(struct unrhdr *uh, u_int item);
  379 
  380 /*
  381  * Population count algorithm using SWAR approach
  382  * - "SIMD Within A Register".
  383  */
  384 static __inline uint32_t
  385 bitcount32(uint32_t x)
  386 {
  387 
  388         x = (x & 0x55555555) + ((x & 0xaaaaaaaa) >> 1);
  389         x = (x & 0x33333333) + ((x & 0xcccccccc) >> 2);
  390         x = (x + (x >> 4)) & 0x0f0f0f0f;
  391         x = (x + (x >> 8));
  392         x = (x + (x >> 16)) & 0x000000ff;
  393         return (x);
  394 }
  395 
  396 static __inline uint16_t
  397 bitcount16(uint32_t x)
  398 {
  399 
  400         x = (x & 0x5555) + ((x & 0xaaaa) >> 1);
  401         x = (x & 0x3333) + ((x & 0xcccc) >> 2);
  402         x = (x + (x >> 4)) & 0x0f0f;
  403         x = (x + (x >> 8)) & 0x00ff;
  404         return (x);
  405 }
  406 
  407 #endif /* !_SYS_SYSTM_H_ */

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