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/kernel.h

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    1 /*-
    2  * Copyright (c) 1995 Terrence R. Lambert
    3  * All rights reserved.
    4  *
    5  * Copyright (c) 1990, 1993
    6  *      The Regents of the University of California.  All rights reserved.
    7  * (c) UNIX System Laboratories, Inc.
    8  * All or some portions of this file are derived from material licensed
    9  * to the University of California by American Telephone and Telegraph
   10  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   11  * the permission of UNIX System Laboratories, Inc.
   12  *
   13  * Redistribution and use in source and binary forms, with or without
   14  * modification, are permitted provided that the following conditions
   15  * are met:
   16  * 1. Redistributions of source code must retain the above copyright
   17  *    notice, this list of conditions and the following disclaimer.
   18  * 2. Redistributions in binary form must reproduce the above copyright
   19  *    notice, this list of conditions and the following disclaimer in the
   20  *    documentation and/or other materials provided with the distribution.
   21  * 3. All advertising materials mentioning features or use of this software
   22  *    must display the following acknowledgement:
   23  *      This product includes software developed by the University of
   24  *      California, Berkeley and its contributors.
   25  * 4. Neither the name of the University nor the names of its contributors
   26  *    may be used to endorse or promote products derived from this software
   27  *    without specific prior written permission.
   28  *
   29  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   30  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   31  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   32  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   33  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   34  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   35  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   36  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   37  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   38  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   39  * SUCH DAMAGE.
   40  *
   41  *      @(#)kernel.h    8.3 (Berkeley) 1/21/94
   42  * $FreeBSD$
   43  */
   44 
   45 #ifndef _SYS_KERNEL_H_
   46 #define _SYS_KERNEL_H_
   47 
   48 #include <sys/linker_set.h>
   49 
   50 #ifdef _KERNEL
   51 
   52 /* for intrhook below */
   53 #include <sys/queue.h>
   54 
   55 /* Global variables for the kernel. */
   56 
   57 /* 1.1 */
   58 extern unsigned long hostid;
   59 extern char hostname[MAXHOSTNAMELEN];
   60 extern int hostnamelen;
   61 extern char domainname[MAXHOSTNAMELEN];
   62 extern int domainnamelen;
   63 extern char kernelname[MAXPATHLEN];
   64 
   65 extern int tick;                        /* usec per tick (1000000 / hz) */
   66 extern int hz;                          /* system clock's frequency */
   67 extern int psratio;                     /* ratio: prof / stat */
   68 extern int stathz;                      /* statistics clock's frequency */
   69 extern int profhz;                      /* profiling clock's frequency */
   70 extern int profprocs;                   /* number of process's profiling */
   71 extern int ticks;
   72 extern int lbolt;                       /* once a second sleep address */
   73 
   74 extern int tz_minuteswest;
   75 extern int tz_dsttime;
   76 
   77 #endif /* _KERNEL */
   78 
   79 /*
   80  * Enumerated types for known system startup interfaces.
   81  *
   82  * Startup occurs in ascending numeric order; the list entries are
   83  * sorted prior to attempting startup to guarantee order.  Items
   84  * of the same level are arbitrated for order based on the 'order'
   85  * element.
   86  *
   87  * These numbers are arbitrary and are chosen ONLY for ordering; the
   88  * enumeration values are explicit rather than implicit to provide
   89  * for binary compatibility with inserted elements.
   90  *
   91  * The SI_SUB_RUN_SCHEDULER value must have the highest lexical value.
   92  *
   93  * The SI_SUB_CONSOLE and SI_SUB_SWAP values represent values used by
   94  * the BSD 4.4Lite but not by FreeBSD; they are maintained in dependent
   95  * order to support porting.
   96  *
   97  * The SI_SUB_PROTO_BEGIN and SI_SUB_PROTO_END bracket a range of
   98  * initializations to take place at splimp().  This is a historical
   99  * wart that should be removed -- probably running everything at
  100  * splimp() until the first init that doesn't want it is the correct
  101  * fix.  They are currently present to ensure historical behavior.
  102  */
  103 enum sysinit_sub_id {
  104         SI_SUB_DUMMY            = 0x0000000,    /* not executed; for linker*/
  105         SI_SUB_DONE             = 0x0000001,    /* processed*/
  106         SI_SUB_TUNABLES         = 0x0700000,    /* establish tunable values */
  107         SI_SUB_CONSOLE          = 0x0800000,    /* console*/
  108         SI_SUB_COPYRIGHT        = 0x0800001,    /* first use of console*/
  109         SI_SUB_SETTINGS         = 0x0880000,    /* check and recheck settings */
  110         SI_SUB_MTX_POOL_STATIC  = 0x0900000,    /* static mutex pool */
  111         SI_SUB_LOCKMGR          = 0x0980000,    /* lockmgr locks */
  112         SI_SUB_VM               = 0x1000000,    /* virtual memory system init*/
  113         SI_SUB_KMEM             = 0x1800000,    /* kernel memory*/
  114         SI_SUB_KVM_RSRC         = 0x1A00000,    /* kvm operational limits*/
  115         SI_SUB_WITNESS          = 0x1A80000,    /* witness initialization */
  116         SI_SUB_MTX_POOL_DYNAMIC = 0x1AC0000,    /* dynamic mutex pool */
  117         SI_SUB_LOCK             = 0x1B00000,    /* various locks */
  118         SI_SUB_EVENTHANDLER     = 0x1C00000,    /* eventhandler init */
  119         SI_SUB_KLD              = 0x2000000,    /* KLD and module setup */
  120         SI_SUB_CPU              = 0x2100000,    /* CPU resource(s)*/
  121         SI_SUB_MAC              = 0x2180000,    /* TrustedBSD MAC subsystem */
  122         SI_SUB_MAC_POLICY       = 0x21C0000,    /* TrustedBSD MAC policies */
  123         SI_SUB_MAC_LATE         = 0x21D0000,    /* TrustedBSD MAC subsystem */
  124         SI_SUB_INTRINSIC        = 0x2200000,    /* proc 0*/
  125         SI_SUB_VM_CONF          = 0x2300000,    /* config VM, set limits*/
  126         SI_SUB_RUN_QUEUE        = 0x2400000,    /* set up run queue*/
  127         SI_SUB_KTRACE           = 0x2480000,    /* ktrace */
  128         SI_SUB_CREATE_INIT      = 0x2500000,    /* create init process*/
  129         SI_SUB_SCHED_IDLE       = 0x2600000,    /* required idle procs */
  130         SI_SUB_MBUF             = 0x2700000,    /* mbuf subsystem */
  131         SI_SUB_INTR             = 0x2800000,    /* interrupt threads */
  132         SI_SUB_SOFTINTR         = 0x2800001,    /* start soft interrupt thread */
  133         SI_SUB_DEVFS            = 0x2F00000,    /* devfs ready for devices */
  134         SI_SUB_INIT_IF          = 0x3000000,    /* prep for net interfaces */
  135         SI_SUB_NETGRAPH         = 0x3010000,    /* Let Netgraph initialize */
  136         SI_SUB_DRIVERS          = 0x3100000,    /* Let Drivers initialize */
  137         SI_SUB_CONFIGURE        = 0x3800000,    /* Configure devices */
  138         SI_SUB_VFS              = 0x4000000,    /* virtual filesystem*/
  139         SI_SUB_CLOCKS           = 0x4800000,    /* real time and stat clocks*/
  140         SI_SUB_CLIST            = 0x5800000,    /* clists*/
  141         SI_SUB_SYSV_SHM         = 0x6400000,    /* System V shared memory*/
  142         SI_SUB_SYSV_SEM         = 0x6800000,    /* System V semaphores*/
  143         SI_SUB_SYSV_MSG         = 0x6C00000,    /* System V message queues*/
  144         SI_SUB_P1003_1B         = 0x6E00000,    /* P1003.1B realtime */
  145         SI_SUB_PSEUDO           = 0x7000000,    /* pseudo devices*/
  146         SI_SUB_EXEC             = 0x7400000,    /* execve() handlers */
  147         SI_SUB_PROTO_BEGIN      = 0x8000000,    /* XXX: set splimp (kludge)*/
  148         SI_SUB_PROTO_IF         = 0x8400000,    /* interfaces*/
  149         SI_SUB_PROTO_DOMAIN     = 0x8800000,    /* domains (address families?)*/
  150         SI_SUB_PROTO_IFATTACHDOMAIN     = 0x8800001,    /* domain dependent data init*/
  151         SI_SUB_PROTO_END        = 0x8ffffff,    /* XXX: set splx (kludge)*/
  152         SI_SUB_KPROF            = 0x9000000,    /* kernel profiling*/
  153         SI_SUB_KICK_SCHEDULER   = 0xa000000,    /* start the timeout events*/
  154         SI_SUB_INT_CONFIG_HOOKS = 0xa800000,    /* Interrupts enabled config */
  155         SI_SUB_ROOT_CONF        = 0xb000000,    /* Find root devices */
  156         SI_SUB_DUMP_CONF        = 0xb200000,    /* Find dump devices */
  157         SI_SUB_RAID             = 0xb380000,    /* Configure RAIDframe or Vinum */
  158         SI_SUB_MOUNT_ROOT       = 0xb400000,    /* root mount*/
  159         SI_SUB_SWAP             = 0xc000000,    /* swap */
  160         SI_SUB_INTRINSIC_POST   = 0xd000000,    /* proc 0 cleanup*/
  161         SI_SUB_KTHREAD_INIT     = 0xe000000,    /* init process*/
  162         SI_SUB_KTHREAD_PAGE     = 0xe400000,    /* pageout daemon*/
  163         SI_SUB_KTHREAD_VM       = 0xe800000,    /* vm daemon*/
  164         SI_SUB_KTHREAD_BUF      = 0xea00000,    /* buffer daemon*/
  165         SI_SUB_KTHREAD_UPDATE   = 0xec00000,    /* update daemon*/
  166         SI_SUB_KTHREAD_IDLE     = 0xee00000,    /* idle procs*/
  167         SI_SUB_SMP              = 0xf000000,    /* start the APs*/
  168         SI_SUB_RUN_SCHEDULER    = 0xfffffff     /* scheduler*/
  169 };
  170 
  171 
  172 /*
  173  * Some enumerated orders; "ANY" sorts last.
  174  */
  175 enum sysinit_elem_order {
  176         SI_ORDER_FIRST          = 0x0000000,    /* first*/
  177         SI_ORDER_SECOND         = 0x0000001,    /* second*/
  178         SI_ORDER_THIRD          = 0x0000002,    /* third*/
  179         SI_ORDER_MIDDLE         = 0x1000000,    /* somewhere in the middle */
  180         SI_ORDER_ANY            = 0xfffffff     /* last*/
  181 };
  182 
  183 
  184 /*
  185  * A system initialization call instance
  186  *
  187  * At the moment there is one instance of sysinit.  We probably do not
  188  * want two which is why this code is if'd out, but we definitely want
  189  * to discern SYSINIT's which take non-constant data pointers and
  190  * SYSINIT's which take constant data pointers,
  191  *
  192  * The C_* macros take functions expecting const void * arguments
  193  * while the non-C_* macros take functions expecting just void * arguments.
  194  *
  195  * With -Wcast-qual on, the compiler issues warnings:
  196  *      - if we pass non-const data or functions taking non-const data
  197  *        to a C_* macro.
  198  *
  199  *      - if we pass const data to the normal macros
  200  *
  201  * However, no warning is issued if we pass a function taking const data
  202  * through a normal non-const macro.  This is ok because the function is
  203  * saying it won't modify the data so we don't care whether the data is
  204  * modifiable or not.
  205  */
  206 
  207 typedef void (*sysinit_nfunc_t)(void *);
  208 typedef void (*sysinit_cfunc_t)(const void *);
  209 
  210 struct sysinit {
  211         enum sysinit_sub_id     subsystem;      /* subsystem identifier*/
  212         enum sysinit_elem_order order;          /* init order within subsystem*/
  213         sysinit_cfunc_t func;                   /* function             */
  214         const void      *udata;                 /* multiplexer/argument */
  215 };
  216 
  217 /*
  218  * Default: no special processing
  219  *
  220  * The C_ version of SYSINIT is for data pointers to const
  221  * data ( and functions taking data pointers to const data ).
  222  * At the moment it is no different from SYSINIT and thus
  223  * still results in warnings.
  224  *
  225  * The casts are necessary to have the compiler produce the
  226  * correct warnings when -Wcast-qual is used.
  227  *
  228  */
  229 #define C_SYSINIT(uniquifier, subsystem, order, func, ident)    \
  230         static struct sysinit uniquifier ## _sys_init = {       \
  231                 subsystem,                                      \
  232                 order,                                          \
  233                 func,                                           \
  234                 (ident)                                         \
  235         };                                                      \
  236         DATA_SET(sysinit_set,uniquifier ## _sys_init);
  237 
  238 #define SYSINIT(uniquifier, subsystem, order, func, ident)      \
  239         C_SYSINIT(uniquifier, subsystem, order,                 \
  240         (sysinit_cfunc_t)(sysinit_nfunc_t)func, (void *)(ident))
  241 
  242 /*
  243  * Called on module unload: no special processing
  244  */
  245 #define C_SYSUNINIT(uniquifier, subsystem, order, func, ident)  \
  246         static struct sysinit uniquifier ## _sys_uninit = {     \
  247                 subsystem,                                      \
  248                 order,                                          \
  249                 func,                                           \
  250                 (ident)                                         \
  251         };                                                      \
  252         DATA_SET(sysuninit_set,uniquifier ## _sys_uninit)
  253 
  254 #define SYSUNINIT(uniquifier, subsystem, order, func, ident)    \
  255         C_SYSUNINIT(uniquifier, subsystem, order,               \
  256         (sysinit_cfunc_t)(sysinit_nfunc_t)func, (void *)(ident))
  257 
  258 void    sysinit_add(struct sysinit **set, struct sysinit **set_end);
  259 
  260 /*
  261  * Infrastructure for tunable 'constants'.  Value may be specified at compile
  262  * time or kernel load time.  Rules relating tunables together can be placed
  263  * in a SYSINIT function at SI_SUB_TUNABLES with SI_ORDER_LAST.
  264  *
  265  * WARNING: developers should never use the reserved suffixes specified in
  266  * loader.conf(5) for any tunables or conflicts will result.
  267  */
  268 
  269 /*
  270  * int
  271  * please avoid using for new tunables!
  272  */
  273 extern void tunable_int_init(void *);
  274 struct tunable_int {
  275         const char *path;
  276         int *var;
  277 };
  278 #define TUNABLE_INT(path, var)                                  \
  279         _TUNABLE_INT((path), (var), __LINE__)
  280 #define _TUNABLE_INT(path, var, line)                           \
  281         __TUNABLE_INT((path), (var), line)
  282 
  283 #define __TUNABLE_INT(path, var, line)                          \
  284         static struct tunable_int __tunable_int_ ## line = {    \
  285                 path,                                           \
  286                 var,                                            \
  287         };                                                      \
  288         SYSINIT(__Tunable_init_ ## line, SI_SUB_TUNABLES, SI_ORDER_MIDDLE, \
  289              tunable_int_init, &__tunable_int_ ## line)
  290 
  291 #define TUNABLE_INT_FETCH(path, var)    getenv_int((path), (var))
  292 
  293 /*
  294  * long
  295  */
  296 extern void tunable_long_init(void *);
  297 struct tunable_long {
  298         const char *path;
  299         long *var;
  300 };
  301 #define TUNABLE_LONG(path, var)                                 \
  302         _TUNABLE_LONG((path), (var), __LINE__)
  303 #define _TUNABLE_LONG(path, var, line)                          \
  304         __TUNABLE_LONG((path), (var), line)
  305 
  306 #define __TUNABLE_LONG(path, var, line)                         \
  307         static struct tunable_long __tunable_long_ ## line = {  \
  308                 path,                                           \
  309                 var,                                            \
  310         };                                                      \
  311         SYSINIT(__Tunable_init_ ## line, SI_SUB_TUNABLES, SI_ORDER_MIDDLE, \
  312              tunable_long_init, &__tunable_long_ ## line)
  313 
  314 #define TUNABLE_LONG_FETCH(path, var)   getenv_long((path), (var))
  315 
  316 /*
  317  * unsigned long
  318  */
  319 extern void tunable_ulong_init(void *);
  320 struct tunable_ulong {
  321         const char *path;
  322         unsigned long *var;
  323 };
  324 #define TUNABLE_ULONG(path, var)                                \
  325         _TUNABLE_ULONG((path), (var), __LINE__)
  326 #define _TUNABLE_ULONG(path, var, line)                         \
  327         __TUNABLE_ULONG((path), (var), line)
  328 
  329 #define __TUNABLE_ULONG(path, var, line)                        \
  330         static struct tunable_ulong __tunable_ulong_ ## line = {\
  331                 path,                                           \
  332                 var,                                            \
  333         };                                                      \
  334         SYSINIT(__Tunable_init_ ## line, SI_SUB_TUNABLES, SI_ORDER_MIDDLE, \
  335              tunable_ulong_init, &__tunable_ulong_ ## line)
  336 
  337 #define TUNABLE_ULONG_FETCH(path, var)  getenv_ulong((path), (var))
  338 
  339 /*
  340  * Quad (64-bit)
  341  * please avoid using for new tunables!
  342  */
  343 extern void tunable_quad_init(void *);
  344 struct tunable_quad {
  345         const char *path;
  346         quad_t *var;
  347 };
  348 #define TUNABLE_QUAD(path, var)                                 \
  349         _TUNABLE_QUAD((path), (var), __LINE__)
  350 #define _TUNABLE_QUAD(path, var, line)                          \
  351         __TUNABLE_QUAD((path), (var), line)
  352 
  353 #define __TUNABLE_QUAD(path, var, line)                 \
  354         static struct tunable_quad __tunable_quad_ ## line = {  \
  355                 path,                                           \
  356                 var,                                            \
  357         };                                                      \
  358         SYSINIT(__Tunable_init_ ## line, SI_SUB_TUNABLES, SI_ORDER_MIDDLE, \
  359             tunable_quad_init, &__tunable_quad_ ## line)
  360 
  361 #define TUNABLE_QUAD_FETCH(path, var)   getenv_quad((path), (var))
  362 
  363 extern void tunable_str_init(void *);
  364 struct tunable_str {
  365         const char *path;
  366         char *var;
  367         int size;
  368 };
  369 #define TUNABLE_STR(path, var, size)                            \
  370         _TUNABLE_STR((path), (var), (size), __LINE__)
  371 #define _TUNABLE_STR(path, var, size, line)                     \
  372         __TUNABLE_STR((path), (var), (size), line)
  373 
  374 #define __TUNABLE_STR(path, var, size, line)                    \
  375         static struct tunable_str __tunable_str_ ## line = {    \
  376                 path,                                           \
  377                 var,                                            \
  378                 size,                                           \
  379         };                                                      \
  380         SYSINIT(__Tunable_init_ ## line, SI_SUB_TUNABLES, SI_ORDER_MIDDLE, \
  381              tunable_str_init, &__tunable_str_ ## line)
  382 
  383 #define TUNABLE_STR_FETCH(path, var, size)                      \
  384         getenv_string((path), (var), (size))
  385 
  386 void    net_warn_not_mpsafe(const char *component);
  387 #define NET_NEEDS_GIANT(component)                                      \
  388         SYSINIT(__net_warn_not_mpsafe_ ## __FILE__,                     \
  389             SI_SUB_SETTINGS, SI_ORDER_SECOND, net_warn_not_mpsafe, component);
  390 
  391 struct intr_config_hook {
  392         TAILQ_ENTRY(intr_config_hook) ich_links;
  393         void    (*ich_func)(void *arg);
  394         void    *ich_arg;
  395 };
  396 
  397 int     config_intrhook_establish(struct intr_config_hook *hook);
  398 void    config_intrhook_disestablish(struct intr_config_hook *hook);
  399 
  400 #endif /* !_SYS_KERNEL_H_*/

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