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/8.1/sys/sys/systm.h 204827 2010-03-07 12:29:50Z ivoras $
   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 copyright[];        /* system copyright */
   53 extern int kstack_pages;        /* number of kernel stack pages */
   54 
   55 extern int nswap;               /* size of swap space */
   56 
   57 extern u_long pagesizes[];      /* supported page sizes */
   58 extern long physmem;            /* physical memory */
   59 extern long realmem;            /* 'real' memory */
   60 
   61 extern char *rootdevnames[2];   /* names of possible root devices */
   62 
   63 extern int boothowto;           /* reboot flags, from console subsystem */
   64 extern int bootverbose;         /* nonzero to print verbose messages */
   65 
   66 extern int maxusers;            /* system tune hint */
   67 extern int ngroups_max;         /* max # of supplemental groups */
   68 extern int vm_guest;            /* Running as virtual machine guest? */
   69 
   70 /*
   71  * Detected virtual machine guest types. The intention is to expand
   72  * and/or add to the VM_GUEST_VM type if specific VM functionality is
   73  * ever implemented (e.g. vendor-specific paravirtualization features).
   74  */
   75 enum VM_GUEST { VM_GUEST_NO = 0, VM_GUEST_VM, VM_GUEST_XEN };
   76 
   77 #ifdef  INVARIANTS              /* The option is always available */
   78 #define KASSERT(exp,msg) do {                                           \
   79         if (__predict_false(!(exp)))                                    \
   80                 panic msg;                                              \
   81 } while (0)
   82 #define VNASSERT(exp, vp, msg) do {                                     \
   83         if (__predict_false(!(exp))) {                                  \
   84                 vn_printf(vp, "VNASSERT failed\n");                     \
   85                 panic msg;                                              \
   86         }                                                               \
   87 } while (0)
   88 #else
   89 #define KASSERT(exp,msg) do { \
   90 } while (0)
   91 
   92 #define VNASSERT(exp, vp, msg) do { \
   93 } while (0)
   94 #endif
   95 
   96 #ifndef CTASSERT                /* Allow lint to override */
   97 #define CTASSERT(x)             _CTASSERT(x, __LINE__)
   98 #define _CTASSERT(x, y)         __CTASSERT(x, y)
   99 #define __CTASSERT(x, y)        typedef char __assert ## y[(x) ? 1 : -1]
  100 #endif
  101 
  102 /*
  103  * Assert that a pointer can be loaded from memory atomically.
  104  *
  105  * This assertion enforces stronger alignment than necessary.  For example,
  106  * on some architectures, atomicity for unaligned loads will depend on
  107  * whether or not the load spans multiple cache lines.
  108  */
  109 #define ASSERT_ATOMIC_LOAD_PTR(var, msg)                                \
  110         KASSERT(sizeof(var) == sizeof(void *) &&                        \
  111             ((uintptr_t)&(var) & (sizeof(void *) - 1)) == 0, msg)
  112 
  113 /*
  114  * XXX the hints declarations are even more misplaced than most declarations
  115  * in this file, since they are needed in one file (per arch) and only used
  116  * in two files.
  117  * XXX most of these variables should be const.
  118  */
  119 extern int osreldate;
  120 extern int envmode;
  121 extern int hintmode;            /* 0 = off. 1 = config, 2 = fallback */
  122 extern int dynamic_kenv;
  123 extern struct mtx kenv_lock;
  124 extern char *kern_envp;
  125 extern char static_env[];
  126 extern char static_hints[];     /* by config for now */
  127 
  128 extern char **kenvp;
  129 
  130 /*
  131  * General function declarations.
  132  */
  133 
  134 struct inpcb;
  135 struct lock_object;
  136 struct malloc_type;
  137 struct mtx;
  138 struct proc;
  139 struct socket;
  140 struct thread;
  141 struct tty;
  142 struct ucred;
  143 struct uio;
  144 struct _jmp_buf;
  145 
  146 int     setjmp(struct _jmp_buf *);
  147 void    longjmp(struct _jmp_buf *, int) __dead2;
  148 int     dumpstatus(vm_offset_t addr, off_t count);
  149 int     nullop(void);
  150 int     eopnotsupp(void);
  151 int     ureadc(int, struct uio *);
  152 void    hashdestroy(void *, struct malloc_type *, u_long);
  153 void    *hashinit(int count, struct malloc_type *type, u_long *hashmark);
  154 void    *hashinit_flags(int count, struct malloc_type *type,
  155     u_long *hashmask, int flags);
  156 #define HASH_NOWAIT     0x00000001
  157 #define HASH_WAITOK     0x00000002
  158 
  159 void    *phashinit(int count, struct malloc_type *type, u_long *nentries);
  160 void    g_waitidle(void);
  161 
  162 #ifdef RESTARTABLE_PANICS
  163 void    panic(const char *, ...) __printflike(1, 2);
  164 #else
  165 void    panic(const char *, ...) __dead2 __printflike(1, 2);
  166 #endif
  167 
  168 void    cpu_boot(int);
  169 void    cpu_flush_dcache(void *, size_t);
  170 void    cpu_rootconf(void);
  171 void    critical_enter(void);
  172 void    critical_exit(void);
  173 void    init_param1(void);
  174 void    init_param2(long physpages);
  175 void    init_param3(long kmempages);
  176 void    tablefull(const char *);
  177 int     kvprintf(char const *, void (*)(int, void*), void *, int,
  178             __va_list) __printflike(1, 0);
  179 void    log(int, const char *, ...) __printflike(2, 3);
  180 void    log_console(struct uio *);
  181 int     printf(const char *, ...) __printflike(1, 2);
  182 int     snprintf(char *, size_t, const char *, ...) __printflike(3, 4);
  183 int     sprintf(char *buf, const char *, ...) __printflike(2, 3);
  184 int     uprintf(const char *, ...) __printflike(1, 2);
  185 int     vprintf(const char *, __va_list) __printflike(1, 0);
  186 int     vsnprintf(char *, size_t, const char *, __va_list) __printflike(3, 0);
  187 int     vsnrprintf(char *, size_t, int, const char *, __va_list) __printflike(4, 0);
  188 int     vsprintf(char *buf, const char *, __va_list) __printflike(2, 0);
  189 int     ttyprintf(struct tty *, const char *, ...) __printflike(2, 3);
  190 int     sscanf(const char *, char const *, ...) __nonnull(1) __nonnull(2);
  191 int     vsscanf(const char *, char const *, __va_list) __nonnull(1) __nonnull(2);
  192 long    strtol(const char *, char **, int) __nonnull(1);
  193 u_long  strtoul(const char *, char **, int) __nonnull(1);
  194 quad_t  strtoq(const char *, char **, int) __nonnull(1);
  195 u_quad_t strtouq(const char *, char **, int) __nonnull(1);
  196 void    tprintf(struct proc *p, int pri, const char *, ...) __printflike(3, 4);
  197 void    hexdump(const void *ptr, int length, const char *hdr, int flags);
  198 #define HD_COLUMN_MASK  0xff
  199 #define HD_DELIM_MASK   0xff00
  200 #define HD_OMIT_COUNT   (1 << 16)
  201 #define HD_OMIT_HEX     (1 << 17)
  202 #define HD_OMIT_CHARS   (1 << 18)
  203 
  204 #define ovbcopy(f, t, l) bcopy((f), (t), (l))
  205 void    bcopy(const void *from, void *to, size_t len) __nonnull(1) __nonnull(2);
  206 void    bzero(void *buf, size_t len) __nonnull(1);
  207 
  208 void    *memcpy(void *to, const void *from, size_t len) __nonnull(1) __nonnull(2);
  209 void    *memmove(void *dest, const void *src, size_t n) __nonnull(1) __nonnull(2);
  210 
  211 int     copystr(const void * __restrict kfaddr, void * __restrict kdaddr,
  212             size_t len, size_t * __restrict lencopied)
  213             __nonnull(1) __nonnull(2);
  214 int     copyinstr(const void * __restrict udaddr, void * __restrict kaddr,
  215             size_t len, size_t * __restrict lencopied)
  216             __nonnull(1) __nonnull(2);
  217 int     copyin(const void * __restrict udaddr, void * __restrict kaddr,
  218             size_t len) __nonnull(1) __nonnull(2);
  219 int     copyout(const void * __restrict kaddr, void * __restrict udaddr,
  220             size_t len) __nonnull(1) __nonnull(2);
  221 
  222 int     fubyte(const void *base);
  223 long    fuword(const void *base);
  224 int     fuword16(void *base);
  225 int32_t fuword32(const void *base);
  226 int64_t fuword64(const void *base);
  227 int     subyte(void *base, int byte);
  228 int     suword(void *base, long word);
  229 int     suword16(void *base, int word);
  230 int     suword32(void *base, int32_t word);
  231 int     suword64(void *base, int64_t word);
  232 uint32_t casuword32(volatile uint32_t *base, uint32_t oldval, uint32_t newval);
  233 u_long   casuword(volatile u_long *p, u_long oldval, u_long newval);
  234 
  235 void    realitexpire(void *);
  236 
  237 int     sysbeep(int hertz, int period);
  238 
  239 void    hardclock(int usermode, uintfptr_t pc);
  240 void    hardclock_cpu(int usermode);
  241 void    softclock(void *);
  242 void    statclock(int usermode);
  243 void    profclock(int usermode, uintfptr_t pc);
  244 
  245 void    startprofclock(struct proc *);
  246 void    stopprofclock(struct proc *);
  247 void    cpu_startprofclock(void);
  248 void    cpu_stopprofclock(void);
  249 
  250 int     cr_cansee(struct ucred *u1, struct ucred *u2);
  251 int     cr_canseesocket(struct ucred *cred, struct socket *so);
  252 int     cr_canseeinpcb(struct ucred *cred, struct inpcb *inp);
  253 
  254 char    *getenv(const char *name);
  255 void    freeenv(char *env);
  256 int     getenv_int(const char *name, int *data);
  257 int     getenv_uint(const char *name, unsigned int *data);
  258 int     getenv_long(const char *name, long *data);
  259 int     getenv_ulong(const char *name, unsigned long *data);
  260 int     getenv_string(const char *name, char *data, int size);
  261 int     getenv_quad(const char *name, quad_t *data);
  262 int     setenv(const char *name, const char *value);
  263 int     unsetenv(const char *name);
  264 int     testenv(const char *name);
  265 
  266 typedef uint64_t (cpu_tick_f)(void);
  267 void set_cputicker(cpu_tick_f *func, uint64_t freq, unsigned var);
  268 extern cpu_tick_f *cpu_ticks;
  269 uint64_t cpu_tickrate(void);
  270 uint64_t cputick2usec(uint64_t tick);
  271 
  272 #ifdef APM_FIXUP_CALLTODO
  273 struct timeval;
  274 void    adjust_timeout_calltodo(struct timeval *time_change);
  275 #endif /* APM_FIXUP_CALLTODO */
  276 
  277 #include <sys/libkern.h>
  278 
  279 /* Initialize the world */
  280 void    consinit(void);
  281 void    cpu_initclocks(void);
  282 void    usrinfoinit(void);
  283 
  284 /* Finalize the world */
  285 void    shutdown_nice(int);
  286 
  287 /* Timeouts */
  288 typedef void timeout_t(void *); /* timeout function type */
  289 #define CALLOUT_HANDLE_INITIALIZER(handle)      \
  290         { NULL }
  291 
  292 void    callout_handle_init(struct callout_handle *);
  293 struct  callout_handle timeout(timeout_t *, void *, int);
  294 void    untimeout(timeout_t *, void *, struct callout_handle);
  295 caddr_t kern_timeout_callwheel_alloc(caddr_t v);
  296 void    kern_timeout_callwheel_init(void);
  297 
  298 /* Stubs for obsolete functions that used to be for interrupt management */
  299 static __inline void            spl0(void)              { return; }
  300 static __inline intrmask_t      splbio(void)            { return 0; }
  301 static __inline intrmask_t      splcam(void)            { return 0; }
  302 static __inline intrmask_t      splclock(void)          { return 0; }
  303 static __inline intrmask_t      splhigh(void)           { return 0; }
  304 static __inline intrmask_t      splimp(void)            { return 0; }
  305 static __inline intrmask_t      splnet(void)            { return 0; }
  306 static __inline intrmask_t      splsoftcam(void)        { return 0; }
  307 static __inline intrmask_t      splsoftclock(void)      { return 0; }
  308 static __inline intrmask_t      splsofttty(void)        { return 0; }
  309 static __inline intrmask_t      splsoftvm(void)         { return 0; }
  310 static __inline intrmask_t      splsofttq(void)         { return 0; }
  311 static __inline intrmask_t      splstatclock(void)      { return 0; }
  312 static __inline intrmask_t      spltty(void)            { return 0; }
  313 static __inline intrmask_t      splvm(void)             { return 0; }
  314 static __inline void            splx(intrmask_t ipl __unused)   { return; }
  315 
  316 /*
  317  * Common `proc' functions are declared here so that proc.h can be included
  318  * less often.
  319  */
  320 int     _sleep(void *chan, struct lock_object *lock, int pri, const char *wmesg,
  321             int timo) __nonnull(1);
  322 #define msleep(chan, mtx, pri, wmesg, timo)                             \
  323         _sleep((chan), &(mtx)->lock_object, (pri), (wmesg), (timo))
  324 int     msleep_spin(void *chan, struct mtx *mtx, const char *wmesg, int timo)
  325             __nonnull(1);
  326 int     pause(const char *wmesg, int timo);
  327 #define tsleep(chan, pri, wmesg, timo)                                  \
  328         _sleep((chan), NULL, (pri), (wmesg), (timo))
  329 void    wakeup(void *chan) __nonnull(1);
  330 void    wakeup_one(void *chan) __nonnull(1);
  331 
  332 /*
  333  * Common `struct cdev *' stuff are declared here to avoid #include poisoning
  334  */
  335 
  336 struct cdev;
  337 dev_t dev2udev(struct cdev *x);
  338 const char *devtoname(struct cdev *cdev);
  339 
  340 int poll_no_poll(int events);
  341 
  342 /* XXX: Should be void nanodelay(u_int nsec); */
  343 void    DELAY(int usec);
  344 
  345 /* Root mount holdback API */
  346 struct root_hold_token;
  347 
  348 struct root_hold_token *root_mount_hold(const char *identifier);
  349 void root_mount_rel(struct root_hold_token *h);
  350 void root_mount_wait(void);
  351 int root_mounted(void);
  352 
  353 
  354 /*
  355  * Unit number allocation API. (kern/subr_unit.c)
  356  */
  357 struct unrhdr;
  358 struct unrhdr *new_unrhdr(int low, int high, struct mtx *mutex);
  359 void delete_unrhdr(struct unrhdr *uh);
  360 void clean_unrhdr(struct unrhdr *uh);
  361 void clean_unrhdrl(struct unrhdr *uh);
  362 int alloc_unr(struct unrhdr *uh);
  363 int alloc_unrl(struct unrhdr *uh);
  364 void free_unr(struct unrhdr *uh, u_int item);
  365 
  366 /*
  367  * This is about as magic as it gets.  fortune(1) has got similar code
  368  * for reversing bits in a word.  Who thinks up this stuff??
  369  *
  370  * Yes, it does appear to be consistently faster than:
  371  * while (i = ffs(m)) {
  372  *      m >>= i;
  373  *      bits++;
  374  * }
  375  * and
  376  * while (lsb = (m & -m)) {     // This is magic too
  377  *      m &= ~lsb;              // or: m ^= lsb
  378  *      bits++;
  379  * }
  380  * Both of these latter forms do some very strange things on gcc-3.1 with
  381  * -mcpu=pentiumpro and/or -march=pentiumpro and/or -O or -O2.
  382  * There is probably an SSE or MMX popcnt instruction.
  383  *
  384  * I wonder if this should be in libkern?
  385  *
  386  * XXX Stop the presses!  Another one:
  387  * static __inline u_int32_t
  388  * popcnt1(u_int32_t v)
  389  * {
  390  *      v -= ((v >> 1) & 0x55555555);
  391  *      v = (v & 0x33333333) + ((v >> 2) & 0x33333333);
  392  *      v = (v + (v >> 4)) & 0x0F0F0F0F;
  393  *      return (v * 0x01010101) >> 24;
  394  * }
  395  * The downside is that it has a multiply.  With a pentium3 with
  396  * -mcpu=pentiumpro and -march=pentiumpro then gcc-3.1 will use
  397  * an imull, and in that case it is faster.  In most other cases
  398  * it appears slightly slower.
  399  *
  400  * Another variant (also from fortune):
  401  * #define BITCOUNT(x) (((BX_(x)+(BX_(x)>>4)) & 0x0F0F0F0F) % 255)
  402  * #define  BX_(x)     ((x) - (((x)>>1)&0x77777777)            \
  403  *                          - (((x)>>2)&0x33333333)            \
  404  *                          - (((x)>>3)&0x11111111))
  405  */
  406 static __inline uint32_t
  407 bitcount32(uint32_t x)
  408 {
  409 
  410         x = (x & 0x55555555) + ((x & 0xaaaaaaaa) >> 1);
  411         x = (x & 0x33333333) + ((x & 0xcccccccc) >> 2);
  412         x = (x + (x >> 4)) & 0x0f0f0f0f;
  413         x = (x + (x >> 8));
  414         x = (x + (x >> 16)) & 0x000000ff;
  415         return (x);
  416 }
  417 
  418 #endif /* !_SYS_SYSTM_H_ */

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