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/10.0/sys/sys/systm.h 258127 2013-11-14 09:33:54Z pluknet $
   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;           /* kern_reboot() 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 u_long pagesizes[];      /* supported page sizes */
   57 extern long physmem;            /* physical memory */
   58 extern long realmem;            /* 'real' memory */
   59 
   60 extern char *rootdevnames[2];   /* names of possible root devices */
   61 
   62 extern int boothowto;           /* reboot flags, from console subsystem */
   63 extern int bootverbose;         /* nonzero to print verbose messages */
   64 
   65 extern int maxusers;            /* system tune hint */
   66 extern int ngroups_max;         /* max # of supplemental groups */
   67 extern int vm_guest;            /* Running as virtual machine guest? */
   68 
   69 /*
   70  * Detected virtual machine guest types. The intention is to expand
   71  * and/or add to the VM_GUEST_VM type if specific VM functionality is
   72  * ever implemented (e.g. vendor-specific paravirtualization features).
   73  * Keep in sync with vm_guest_sysctl_names[].
   74  */
   75 enum VM_GUEST { VM_GUEST_NO = 0, VM_GUEST_VM, VM_GUEST_XEN, VM_GUEST_HV,
   76                 VM_LAST };
   77 
   78 #if defined(WITNESS) || defined(INVARIANTS)
   79 void    kassert_panic(const char *fmt, ...)  __printflike(1, 2);
   80 #endif
   81 
   82 #ifdef  INVARIANTS              /* The option is always available */
   83 #define KASSERT(exp,msg) do {                                           \
   84         if (__predict_false(!(exp)))                                    \
   85                 kassert_panic msg;                                              \
   86 } while (0)
   87 #define VNASSERT(exp, vp, msg) do {                                     \
   88         if (__predict_false(!(exp))) {                                  \
   89                 vn_printf(vp, "VNASSERT failed\n");                     \
   90                 kassert_panic msg;                                              \
   91         }                                                               \
   92 } while (0)
   93 #else
   94 #define KASSERT(exp,msg) do { \
   95 } while (0)
   96 
   97 #define VNASSERT(exp, vp, msg) do { \
   98 } while (0)
   99 #endif
  100 
  101 #ifndef CTASSERT        /* Allow lint to override */
  102 #define CTASSERT(x)     _Static_assert(x, "compile-time assertion failed")
  103 #endif
  104 
  105 /*
  106  * Assert that a pointer can be loaded from memory atomically.
  107  *
  108  * This assertion enforces stronger alignment than necessary.  For example,
  109  * on some architectures, atomicity for unaligned loads will depend on
  110  * whether or not the load spans multiple cache lines.
  111  */
  112 #define ASSERT_ATOMIC_LOAD_PTR(var, msg)                                \
  113         KASSERT(sizeof(var) == sizeof(void *) &&                        \
  114             ((uintptr_t)&(var) & (sizeof(void *) - 1)) == 0, msg)
  115 
  116 /*
  117  * Assert that a thread is in critical(9) section.
  118  */
  119 #define CRITICAL_ASSERT(td)                                             \
  120         KASSERT((td)->td_critnest >= 1, ("Not in critical section"));
  121  
  122 /*
  123  * If we have already panic'd and this is the thread that called
  124  * panic(), then don't block on any mutexes but silently succeed.
  125  * Otherwise, the kernel will deadlock since the scheduler isn't
  126  * going to run the thread that holds any lock we need.
  127  */
  128 #define SCHEDULER_STOPPED() __predict_false(curthread->td_stopsched)
  129 
  130 /*
  131  * XXX the hints declarations are even more misplaced than most declarations
  132  * in this file, since they are needed in one file (per arch) and only used
  133  * in two files.
  134  * XXX most of these variables should be const.
  135  */
  136 extern int osreldate;
  137 extern int envmode;
  138 extern int hintmode;            /* 0 = off. 1 = config, 2 = fallback */
  139 extern int dynamic_kenv;
  140 extern struct mtx kenv_lock;
  141 extern char *kern_envp;
  142 extern char static_env[];
  143 extern char static_hints[];     /* by config for now */
  144 
  145 extern char **kenvp;
  146 
  147 extern const void *zero_region; /* address space maps to a zeroed page  */
  148 
  149 extern int unmapped_buf_allowed;
  150 extern int iosize_max_clamp;
  151 extern int devfs_iosize_max_clamp;
  152 #define IOSIZE_MAX      (iosize_max_clamp ? INT_MAX : SSIZE_MAX)
  153 #define DEVFS_IOSIZE_MAX        (devfs_iosize_max_clamp ? INT_MAX : SSIZE_MAX)
  154 
  155 /*
  156  * General function declarations.
  157  */
  158 
  159 struct inpcb;
  160 struct lock_object;
  161 struct malloc_type;
  162 struct mtx;
  163 struct proc;
  164 struct socket;
  165 struct thread;
  166 struct tty;
  167 struct ucred;
  168 struct uio;
  169 struct _jmp_buf;
  170 struct trapframe;
  171 
  172 int     setjmp(struct _jmp_buf *) __returns_twice;
  173 void    longjmp(struct _jmp_buf *, int) __dead2;
  174 int     dumpstatus(vm_offset_t addr, off_t count);
  175 int     nullop(void);
  176 int     eopnotsupp(void);
  177 int     ureadc(int, struct uio *);
  178 void    hashdestroy(void *, struct malloc_type *, u_long);
  179 void    *hashinit(int count, struct malloc_type *type, u_long *hashmask);
  180 void    *hashinit_flags(int count, struct malloc_type *type,
  181     u_long *hashmask, int flags);
  182 #define HASH_NOWAIT     0x00000001
  183 #define HASH_WAITOK     0x00000002
  184 
  185 void    *phashinit(int count, struct malloc_type *type, u_long *nentries);
  186 void    g_waitidle(void);
  187 
  188 void    panic(const char *, ...) __dead2 __printflike(1, 2);
  189 
  190 void    cpu_boot(int);
  191 void    cpu_flush_dcache(void *, size_t);
  192 void    cpu_rootconf(void);
  193 void    critical_enter(void);
  194 void    critical_exit(void);
  195 void    init_param1(void);
  196 void    init_param2(long physpages);
  197 void    init_static_kenv(char *, size_t);
  198 void    tablefull(const char *);
  199 int     kvprintf(char const *, void (*)(int, void*), void *, int,
  200             __va_list) __printflike(1, 0);
  201 void    log(int, const char *, ...) __printflike(2, 3);
  202 void    log_console(struct uio *);
  203 int     printf(const char *, ...) __printflike(1, 2);
  204 int     snprintf(char *, size_t, const char *, ...) __printflike(3, 4);
  205 int     sprintf(char *buf, const char *, ...) __printflike(2, 3);
  206 int     uprintf(const char *, ...) __printflike(1, 2);
  207 int     vprintf(const char *, __va_list) __printflike(1, 0);
  208 int     vsnprintf(char *, size_t, const char *, __va_list) __printflike(3, 0);
  209 int     vsnrprintf(char *, size_t, int, const char *, __va_list) __printflike(4, 0);
  210 int     vsprintf(char *buf, const char *, __va_list) __printflike(2, 0);
  211 int     ttyprintf(struct tty *, const char *, ...) __printflike(2, 3);
  212 int     sscanf(const char *, char const *, ...) __nonnull(1) __nonnull(2);
  213 int     vsscanf(const char *, char const *, __va_list) __nonnull(1) __nonnull(2);
  214 long    strtol(const char *, char **, int) __nonnull(1);
  215 u_long  strtoul(const char *, char **, int) __nonnull(1);
  216 quad_t  strtoq(const char *, char **, int) __nonnull(1);
  217 u_quad_t strtouq(const char *, char **, int) __nonnull(1);
  218 void    tprintf(struct proc *p, int pri, const char *, ...) __printflike(3, 4);
  219 void    vtprintf(struct proc *, int, const char *, __va_list) __printflike(3, 0);
  220 void    hexdump(const void *ptr, int length, const char *hdr, int flags);
  221 #define HD_COLUMN_MASK  0xff
  222 #define HD_DELIM_MASK   0xff00
  223 #define HD_OMIT_COUNT   (1 << 16)
  224 #define HD_OMIT_HEX     (1 << 17)
  225 #define HD_OMIT_CHARS   (1 << 18)
  226 
  227 #define ovbcopy(f, t, l) bcopy((f), (t), (l))
  228 void    bcopy(const void *from, void *to, size_t len) __nonnull(1) __nonnull(2);
  229 void    bzero(void *buf, size_t len) __nonnull(1);
  230 
  231 void    *memcpy(void *to, const void *from, size_t len) __nonnull(1) __nonnull(2);
  232 void    *memmove(void *dest, const void *src, size_t n) __nonnull(1) __nonnull(2);
  233 
  234 int     copystr(const void * __restrict kfaddr, void * __restrict kdaddr,
  235             size_t len, size_t * __restrict lencopied)
  236             __nonnull(1) __nonnull(2);
  237 int     copyinstr(const void * __restrict udaddr, void * __restrict kaddr,
  238             size_t len, size_t * __restrict lencopied)
  239             __nonnull(1) __nonnull(2);
  240 int     copyin(const void * __restrict udaddr, void * __restrict kaddr,
  241             size_t len) __nonnull(1) __nonnull(2);
  242 int     copyin_nofault(const void * __restrict udaddr, void * __restrict kaddr,
  243             size_t len) __nonnull(1) __nonnull(2);
  244 int     copyout(const void * __restrict kaddr, void * __restrict udaddr,
  245             size_t len) __nonnull(1) __nonnull(2);
  246 int     copyout_nofault(const void * __restrict kaddr, void * __restrict udaddr,
  247             size_t len) __nonnull(1) __nonnull(2);
  248 
  249 int     fubyte(const void *base);
  250 long    fuword(const void *base);
  251 int     fuword16(void *base);
  252 int32_t fuword32(const void *base);
  253 int64_t fuword64(const void *base);
  254 int     subyte(void *base, int byte);
  255 int     suword(void *base, long word);
  256 int     suword16(void *base, int word);
  257 int     suword32(void *base, int32_t word);
  258 int     suword64(void *base, int64_t word);
  259 uint32_t casuword32(volatile uint32_t *base, uint32_t oldval, uint32_t newval);
  260 u_long   casuword(volatile u_long *p, u_long oldval, u_long newval);
  261 
  262 void    realitexpire(void *);
  263 
  264 int     sysbeep(int hertz, int period);
  265 
  266 void    hardclock(int usermode, uintfptr_t pc);
  267 void    hardclock_cnt(int cnt, int usermode);
  268 void    hardclock_cpu(int usermode);
  269 void    hardclock_sync(int cpu);
  270 void    softclock(void *);
  271 void    statclock(int usermode);
  272 void    statclock_cnt(int cnt, int usermode);
  273 void    profclock(int usermode, uintfptr_t pc);
  274 void    profclock_cnt(int cnt, int usermode, uintfptr_t pc);
  275 
  276 int     hardclockintr(void);
  277 
  278 void    startprofclock(struct proc *);
  279 void    stopprofclock(struct proc *);
  280 void    cpu_startprofclock(void);
  281 void    cpu_stopprofclock(void);
  282 sbintime_t      cpu_idleclock(void);
  283 void    cpu_activeclock(void);
  284 void    cpu_new_callout(int cpu, sbintime_t bt, sbintime_t bt_opt);
  285 extern int      cpu_can_deep_sleep;
  286 extern int      cpu_disable_deep_sleep;
  287 
  288 int     cr_cansee(struct ucred *u1, struct ucred *u2);
  289 int     cr_canseesocket(struct ucred *cred, struct socket *so);
  290 int     cr_canseeinpcb(struct ucred *cred, struct inpcb *inp);
  291 
  292 char    *getenv(const char *name);
  293 void    freeenv(char *env);
  294 int     getenv_int(const char *name, int *data);
  295 int     getenv_uint(const char *name, unsigned int *data);
  296 int     getenv_long(const char *name, long *data);
  297 int     getenv_ulong(const char *name, unsigned long *data);
  298 int     getenv_string(const char *name, char *data, int size);
  299 int     getenv_quad(const char *name, quad_t *data);
  300 int     setenv(const char *name, const char *value);
  301 int     unsetenv(const char *name);
  302 int     testenv(const char *name);
  303 
  304 typedef uint64_t (cpu_tick_f)(void);
  305 void set_cputicker(cpu_tick_f *func, uint64_t freq, unsigned var);
  306 extern cpu_tick_f *cpu_ticks;
  307 uint64_t cpu_tickrate(void);
  308 uint64_t cputick2usec(uint64_t tick);
  309 
  310 #ifdef APM_FIXUP_CALLTODO
  311 struct timeval;
  312 void    adjust_timeout_calltodo(struct timeval *time_change);
  313 #endif /* APM_FIXUP_CALLTODO */
  314 
  315 #include <sys/libkern.h>
  316 
  317 /* Initialize the world */
  318 void    consinit(void);
  319 void    cpu_initclocks(void);
  320 void    cpu_initclocks_bsp(void);
  321 void    cpu_initclocks_ap(void);
  322 void    usrinfoinit(void);
  323 
  324 /* Finalize the world */
  325 void    kern_reboot(int) __dead2;
  326 void    shutdown_nice(int);
  327 
  328 /* Timeouts */
  329 typedef void timeout_t(void *); /* timeout function type */
  330 #define CALLOUT_HANDLE_INITIALIZER(handle)      \
  331         { NULL }
  332 
  333 void    callout_handle_init(struct callout_handle *);
  334 struct  callout_handle timeout(timeout_t *, void *, int);
  335 void    untimeout(timeout_t *, void *, struct callout_handle);
  336 
  337 /* Stubs for obsolete functions that used to be for interrupt management */
  338 static __inline intrmask_t      splbio(void)            { return 0; }
  339 static __inline intrmask_t      splcam(void)            { return 0; }
  340 static __inline intrmask_t      splclock(void)          { return 0; }
  341 static __inline intrmask_t      splhigh(void)           { return 0; }
  342 static __inline intrmask_t      splimp(void)            { return 0; }
  343 static __inline intrmask_t      splnet(void)            { return 0; }
  344 static __inline intrmask_t      spltty(void)            { return 0; }
  345 static __inline intrmask_t      splvm(void)             { return 0; }
  346 static __inline void            splx(intrmask_t ipl __unused)   { return; }
  347 
  348 /*
  349  * Common `proc' functions are declared here so that proc.h can be included
  350  * less often.
  351  */
  352 int     _sleep(void *chan, struct lock_object *lock, int pri, const char *wmesg,
  353            sbintime_t sbt, sbintime_t pr, int flags) __nonnull(1);
  354 #define msleep(chan, mtx, pri, wmesg, timo)                             \
  355         _sleep((chan), &(mtx)->lock_object, (pri), (wmesg),             \
  356             tick_sbt * (timo), 0, C_HARDCLOCK)
  357 #define msleep_sbt(chan, mtx, pri, wmesg, bt, pr, flags)                \
  358         _sleep((chan), &(mtx)->lock_object, (pri), (wmesg), (bt), (pr), \
  359             (flags))
  360 int     msleep_spin_sbt(void *chan, struct mtx *mtx, const char *wmesg,
  361             sbintime_t sbt, sbintime_t pr, int flags) __nonnull(1);
  362 #define msleep_spin(chan, mtx, wmesg, timo)                             \
  363         msleep_spin_sbt((chan), (mtx), (wmesg), tick_sbt * (timo),      \
  364             0, C_HARDCLOCK)
  365 int     pause_sbt(const char *wmesg, sbintime_t sbt, sbintime_t pr,
  366             int flags);
  367 #define pause(wmesg, timo)                                              \
  368         pause_sbt((wmesg), tick_sbt * (timo), 0, C_HARDCLOCK)
  369 #define tsleep(chan, pri, wmesg, timo)                                  \
  370         _sleep((chan), NULL, (pri), (wmesg), tick_sbt * (timo),         \
  371             0, C_HARDCLOCK)
  372 #define tsleep_sbt(chan, pri, wmesg, bt, pr, flags)                     \
  373         _sleep((chan), NULL, (pri), (wmesg), (bt), (pr), (flags))
  374 void    wakeup(void *chan) __nonnull(1);
  375 void    wakeup_one(void *chan) __nonnull(1);
  376 
  377 /*
  378  * Common `struct cdev *' stuff are declared here to avoid #include poisoning
  379  */
  380 
  381 struct cdev;
  382 dev_t dev2udev(struct cdev *x);
  383 const char *devtoname(struct cdev *cdev);
  384 
  385 int poll_no_poll(int events);
  386 
  387 /* XXX: Should be void nanodelay(u_int nsec); */
  388 void    DELAY(int usec);
  389 
  390 /* Root mount holdback API */
  391 struct root_hold_token;
  392 
  393 struct root_hold_token *root_mount_hold(const char *identifier);
  394 void root_mount_rel(struct root_hold_token *h);
  395 void root_mount_wait(void);
  396 int root_mounted(void);
  397 
  398 
  399 /*
  400  * Unit number allocation API. (kern/subr_unit.c)
  401  */
  402 struct unrhdr;
  403 struct unrhdr *new_unrhdr(int low, int high, struct mtx *mutex);
  404 void init_unrhdr(struct unrhdr *uh, int low, int high, struct mtx *mutex);
  405 void delete_unrhdr(struct unrhdr *uh);
  406 void clean_unrhdr(struct unrhdr *uh);
  407 void clean_unrhdrl(struct unrhdr *uh);
  408 int alloc_unr(struct unrhdr *uh);
  409 int alloc_unr_specific(struct unrhdr *uh, u_int item);
  410 int alloc_unrl(struct unrhdr *uh);
  411 void free_unr(struct unrhdr *uh, u_int item);
  412 
  413 /*
  414  * Population count algorithm using SWAR approach
  415  * - "SIMD Within A Register".
  416  */
  417 static __inline uint32_t
  418 bitcount32(uint32_t x)
  419 {
  420 
  421         x = (x & 0x55555555) + ((x & 0xaaaaaaaa) >> 1);
  422         x = (x & 0x33333333) + ((x & 0xcccccccc) >> 2);
  423         x = (x + (x >> 4)) & 0x0f0f0f0f;
  424         x = (x + (x >> 8));
  425         x = (x + (x >> 16)) & 0x000000ff;
  426         return (x);
  427 }
  428 
  429 static __inline uint16_t
  430 bitcount16(uint32_t x)
  431 {
  432 
  433         x = (x & 0x5555) + ((x & 0xaaaa) >> 1);
  434         x = (x & 0x3333) + ((x & 0xcccc) >> 2);
  435         x = (x + (x >> 4)) & 0x0f0f;
  436         x = (x + (x >> 8)) & 0x00ff;
  437         return (x);
  438 }
  439 
  440 #endif /* !_SYS_SYSTM_H_ */

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