sys/sys/systm.h

   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  * 3. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  *
  38  *      @(#)systm.h     8.7 (Berkeley) 3/29/95
  39  * $FreeBSD: src/sys/sys/systm.h,v 1.111.2.18 2002/12/17 18:04:02 sam Exp $
  40  * $DragonFly: src/sys/sys/systm.h,v 1.81 2008/09/11 00:35:49 dillon Exp $
  41  */
  42
  43 #ifndef _SYS_SYSTM_H_
  44 #define _SYS_SYSTM_H_
  45
  46 #ifndef _KERNEL
  47 #error "This file should not be included by userland programs."
  48 #else
  49
  50 #ifndef _MACHINE_TYPES_H_
  51 #include <machine/types.h>
  52 #endif
  53 #ifndef _MACHINE_STDARG_H_
  54 #include <machine/stdarg.h>
  55 #endif
  56 #include <machine/atomic.h>
  57 #include <machine/cpufunc.h>
  58 #include <sys/callout.h>
  59
  60 extern int securelevel;         /* system security level (see init(8)) */
  61 extern int kernel_mem_readonly; /* disable writes to kernel memory */
  62
  63 extern int cold;                /* nonzero if we are doing a cold boot */
  64 extern int tsleep_now_works;    /* tsleep won't just return any more */
  65 extern const char *panicstr;    /* panic message */
  66 extern int dumping;             /* system is dumping */
  67 extern int safepri;             /* safe ipl when cold or panicing */
  68 extern char version[];          /* system version */
  69 extern char copyright[];        /* system copyright */
  70
  71 extern int selwait;             /* select timeout address */
  72
  73 extern u_char curpriority;      /* priority of current process */
  74
  75 extern int physmem;             /* physical memory */
  76
  77 extern cdev_t dumpdev;          /* dump device */
  78 extern u_int64_t dumplo64;      /* block number into dumpdev, start of dump */
  79
  80 extern cdev_t rootdev;          /* root device */
  81 extern cdev_t rootdevs[2];      /* possible root devices */
  82 extern char *rootdevnames[2];   /* names of possible root devices */
  83 extern char *ZeroPage;
  84
  85 extern int boothowto;           /* reboot flags, from console subsystem */
  86 extern int bootverbose;         /* nonzero to print verbose messages */
  87
  88 extern int maxusers;            /* system tune hint */
  89
  90 extern int ncpus;               /* total number of cpus (real, hyper, virtual)*/
  91 extern int ncpus2;              /* ncpus rounded down to power of 2 */
  92 extern int ncpus2_shift;        /* log base 2 of ncpus2 */
  93 extern int ncpus2_mask;         /* ncpus2 - 1 */
  94 extern int ncpus_fit;           /* round up to a power of 2 */
  95 extern int ncpus_fit_mask;      /* ncpus_fit - 1 */
  96 extern int clocks_running;      /* timing/timeout subsystem is operational */
  97
  98 /* XXX TGEN these don't belong here, they're MD on i386/x86_64 */
  99 extern u_int cpu_feature;       /* CPUID_* features */
 100 extern u_int cpu_feature2;      /* CPUID2_* features */
 101
 102 extern int nfs_diskless_valid;  /* NFS diskless params were obtained */
 103 extern vm_paddr_t Maxmem;       /* Highest physical memory address in system */
 104
 105 #ifdef  INVARIANTS              /* The option is always available */
 106 #define KASSERT(exp,msg)        do { if (__predict_false(!(exp)))       \
 107                                         panic msg; } while (0)
 108 #define KKASSERT(exp)           do { if (__predict_false(!(exp)))       \
 109                                         panic("assertion: %s in %s",    \
 110                                               #exp, __func__); } while (0)
 111 #define __debugvar
 112 #else
 113 #define KASSERT(exp,msg)
 114 #define KKASSERT(exp)
 115 #define __debugvar              __attribute__((__unused__))
 116 #endif
 117
 118 #define CTASSERT(x)             _CTASSERT(x, __LINE__)
 119 #define _CTASSERT(x, y)         __CTASSERT(x, y)
 120 #define __CTASSERT(x, y)        typedef char __assert ## y[(x) ? 1 : -1]
 121
 122 /*
 123  * General function declarations.
 124  */
 125
 126 struct intrframe;
 127 struct spinlock;
 128 struct lock;
 129 struct mtx;
 130 struct lwkt_serialize;
 131 struct malloc_type;
 132 struct proc;
 133 struct xwait;
 134 struct timeval;
 135 struct tty;
 136 struct uio;
 137 struct globaldata;
 138 struct thread;
 139 struct trapframe;
 140 struct user;
 141 struct vmspace;
 142 struct savetls;
 143 struct krate;
 144
 145 void    Debugger (const char *msg);
 146 void    print_backtrace(void);
 147 void    mi_gdinit (struct globaldata *gd, int cpu);
 148 void    mi_proc0init(struct globaldata *gd, struct user *proc0paddr);
 149 int     nullop (void);
 150 int     seltrue (cdev_t dev, int which);
 151 int     ureadc (int, struct uio *);
 152 void    *hashinit (int count, struct malloc_type *type, u_long *hashmask);
 153 void    *phashinit (int count, struct malloc_type *type, u_long *nentries);
 154 void    *hashinit_ext (int count, size_t size,
 155                         struct malloc_type *type, u_long *hashmask);
 156 void    *phashinit_ext (int count, size_t size,
 157                         struct malloc_type *type, u_long *nentries);
 158
 159 int     cpu_sanitize_frame (struct trapframe *);
 160 int     cpu_sanitize_tls (struct savetls *);
 161 void    cpu_spinlock_contested(void);
 162 void    cpu_halt (void);
 163 void    cpu_reset (void);
 164 void    cpu_boot (int);
 165 void    cpu_rootconf (void);
 166 void    cpu_vmspace_alloc(struct vmspace *);
 167 void    cpu_vmspace_free(struct vmspace *);
 168 void    cpu_vkernel_trap(struct trapframe *, int);
 169 void    set_user_TLS(void);
 170 void    set_vkernel_fp(struct trapframe *);
 171 int     kvm_access_check(vm_offset_t, vm_offset_t, int);
 172
 173 vm_paddr_t kvtop(void *addr);
 174 int     is_physical_memory (vm_offset_t addr);
 175
 176 extern uint32_t crc32_tab[];
 177 uint32_t crc32(const void *buf, size_t size);
 178 uint32_t crc32_ext(const void *buf, size_t size, uint32_t ocrc);
 179 void    init_param1 (void);
 180 void    init_param2 (int physpages);
 181 void    tablefull (const char *);
 182 int     kvcprintf (char const *, void (*)(int, void*), void *, int,
 183                       __va_list) __printflike(1, 0);
 184 int     log (int, const char *, ...) __printflike(2, 3);
 185 void    logwakeup (void);
 186 void    log_console (struct uio *);
 187 int     kprintf (const char *, ...) __printflike(1, 2);
 188 int     kprintf0(const char *, ...) __printflike(1, 2);
 189 void    krateprintf (struct krate *, const char *, ...) __printflike(2, 3);
 190 int     ksnprintf (char *, size_t, const char *, ...) __printflike(3, 4);
 191 int     ksnrprintf (char *, size_t, int, const char *, ...) __printflike(4, 5);
 192 int     ksprintf (char *buf, const char *, ...) __printflike(2, 3);
 193 int     uprintf (const char *, ...) __printflike(1, 2);
 194 int     kvprintf (const char *, __va_list) __printflike(1, 0);
 195 int     kvsnprintf (char *, size_t, const char *,
 196                         __va_list) __printflike(3, 0);
 197 int     kvsnrprintf (char *, size_t, int, const char *,
 198                         __va_list) __printflike(4, 0);
 199 int     kvasnrprintf (char **, size_t, int, const char *,
 200                         __va_list) __printflike(4, 0);
 201 int     kvsprintf (char *buf, const char *,
 202                         __va_list) __printflike(2, 0);
 203 int     ttyprintf (struct tty *, const char *, ...) __printflike(2, 3);
 204 int     ksscanf (const char *, char const *, ...);
 205 int     kvsscanf (const char *, char const *, __va_list);
 206 void    kvasfree(char **);
 207
 208 long    strtol (const char *, char **, int);
 209 u_long  strtoul (const char *, char **, int);
 210 quad_t  strtoq (const char *, char **, int);
 211 u_quad_t strtouq (const char *, char **, int);
 212
 213 /*
 214  * note: some functions commonly used by device drivers may be passed
 215  * pointers to volatile storage, volatile set to avoid warnings.
 216  *
 217  * NOTE: bcopyb() - is a dumb byte-granular bcopy.  This routine is
 218  *                  explicitly not meant to be sophisticated.
 219  * NOTE: bcopyi() - is a dumb int-granular bcopy (len is still in bytes).
 220  *                  This routine is explicitly not meant to be sophisticated.
 221  */
 222 void    bcopyb (const void *from, void *to, size_t len);
 223 void    bcopyi (const void *from, void *to, size_t len);
 224 void    bcopy (volatile const void *from, volatile void *to, size_t len);
 225 void    ovbcopy (const void *from, void *to, size_t len);
 226 void    bzero (volatile void *buf, size_t len);
 227 void    *memcpy (void *to, const void *from, size_t len);
 228
 229 int     copystr (const void *kfaddr, void *kdaddr, size_t len,
 230                 size_t *lencopied);
 231 int     copyinstr (const void *udaddr, void *kaddr, size_t len,
 232                 size_t *lencopied);
 233 int     copyin (const void *udaddr, void *kaddr, size_t len);
 234 int     copyout (const void *kaddr, void *udaddr, size_t len);
 235
 236 int     fubyte (const void *base);
 237 int     subyte (void *base, int byte);
 238 long    fuword (const void *base);
 239 int     suword (void *base, long word);
 240 int     fusword (void *base);
 241 int     susword (void *base, int word);
 242
 243 void    realitexpire (void *);
 244 void    DELAY(int usec);
 245 void    DRIVERSLEEP(int usec);
 246
 247 void    startprofclock (struct proc *);
 248 void    stopprofclock (struct proc *);
 249 void    setstatclockrate (int hzrate);
 250
 251 /*
 252  * Console I/O spinlocks - these typically also hard-disable interrupts
 253  * for the duration.
 254  */
 255 void    cons_lock(void);
 256 void    cons_unlock(void);
 257
 258 /*
 259  * Kernel environment support functions and sundry.
 260  */
 261 char    *kgetenv (const char *name);
 262 int     ksetenv(const char *name, const char *value);
 263 int     kunsetenv(const char *name);
 264 void    kfreeenv(char *env);
 265 int     ktestenv(const char *name);
 266 int     kgetenv_int (const char *name, int *data);
 267 int     kgetenv_string (const char *name, char *data, int size);
 268 int     kgetenv_ulong(const char *name, unsigned long *data);
 269 int     kgetenv_quad (const char *name, quad_t *data);
 270 int     kgetenv_long(const char *name, long *data);
 271 extern char *kern_envp;
 272
 273 #ifdef APM_FIXUP_CALLTODO
 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    mi_startup (void);
 281 void    nchinit (void);
 282
 283 /* Finalize the world. */
 284 void    shutdown_nice (int);
 285
 286 /*
 287  * Kernel to clock driver interface.
 288  */
 289 void    inittodr (time_t base);
 290 void    resettodr (void);
 291 void    startrtclock (void);
 292
 293 /* Timeouts */
 294 typedef void timeout_t (void *);        /* timeout function type */
 295
 296 /* Interrupt management */
 297
 298 /*
 299  * For the alpha arch, some of these functions are static __inline, and
 300  * the others should be.
 301  */
 302 #if defined(__i386__) || defined(__x86_64__)
 303 void            setdelayed (void);
 304 void            setsoftcambio (void);
 305 void            setsoftcamnet (void);
 306 void            setsoftunused02 (void);
 307 void            setsoftcrypto (void);
 308 void            setsoftunused01 (void);
 309 void            setsofttty (void);
 310 void            setsoftvm (void);
 311 void            setsofttq (void);
 312 void            schedsofttty (void);
 313 void            splz (void);
 314 void            splz_check (void);
 315 #endif /* __i386__ */
 316
 317 /*
 318  * Various callout lists.
 319  */
 320
 321 /* Exit callout list declarations. */
 322 typedef void (*exitlist_fn) (struct thread *td);
 323
 324 int     at_exit (exitlist_fn function);
 325 int     rm_at_exit (exitlist_fn function);
 326
 327 /* Fork callout list declarations. */
 328 typedef void (*forklist_fn) (struct proc *parent, struct proc *child,
 329                                  int flags);
 330
 331 int     at_fork (forklist_fn function);
 332 int     rm_at_fork (forklist_fn function);
 333
 334 /*
 335  * Not exactly a callout LIST, but a callout entry.
 336  * Allow an external module to define a hardware watchdog tickler.
 337  * Normally a process would do this, but there are times when the
 338  * kernel needs to be able to hold off the watchdog, when the process
 339  * is not active, e.g., when dumping core.
 340  */
 341 typedef void (*watchdog_tickle_fn) (void);
 342
 343 extern watchdog_tickle_fn       wdog_tickler;
 344
 345 /*
 346  * Common `proc' functions are declared here so that proc.h can be included
 347  * less often.
 348  */
 349 int     tsleep (void *, int, const char *, int);
 350 int     ssleep (void *, struct spinlock *, int, const char *, int);
 351 int     lksleep (void *, struct lock *, int, const char *, int);
 352 int     mtxsleep (void *, struct mtx *, int, const char *, int);
 353 int     zsleep(void *, struct lwkt_serialize *, int, const char *, int);
 354 void    tsleep_interlock (void *, int);
 355 void    tsleep_remove (struct thread *);
 356 int     lwkt_sleep (const char *, int);
 357 void    tstop (void);
 358 void    wakeup (void *chan);
 359 void    wakeup_one (void *chan);
 360 void    wakeup_mycpu (void *chan);
 361 void    wakeup_mycpu_one (void *chan);
 362 void    wakeup_oncpu (struct globaldata *gd, void *chan);
 363 void    wakeup_oncpu_one (struct globaldata *gd, void *chan);
 364 void    wakeup_domain (void *chan, int domain);
 365 void    wakeup_domain_one (void *chan, int domain);
 366
 367 /*
 368  * Common `cdev_t' stuff are declared here to avoid #include poisoning
 369  */
 370
 371 int major(cdev_t x);
 372 int minor(cdev_t x);
 373 udev_t dev2udev(cdev_t x);
 374 cdev_t udev2dev(udev_t x, int b);
 375 int uminor(udev_t dev);
 376 int umajor(udev_t dev);
 377 udev_t makeudev(int x, int y);
 378
 379 #endif  /* _KERNEL */
 380 #endif /* !_SYS_SYSTM_H_ */