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_AUDIT            = 0x24C0000,    /* audit */
  129         SI_SUB_CREATE_INIT      = 0x2500000,    /* create init process*/
  130         SI_SUB_SCHED_IDLE       = 0x2600000,    /* required idle procs */
  131         SI_SUB_MBUF             = 0x2700000,    /* mbuf subsystem */
  132         SI_SUB_INTR             = 0x2800000,    /* interrupt threads */
  133         SI_SUB_SOFTINTR         = 0x2800001,    /* start soft interrupt thread */
  134         SI_SUB_ACL              = 0x2900000,    /* start for filesystem ACLs */
  135         SI_SUB_DEVFS            = 0x2F00000,    /* devfs ready for devices */
  136         SI_SUB_INIT_IF          = 0x3000000,    /* prep for net interfaces */
  137         SI_SUB_NETGRAPH         = 0x3010000,    /* Let Netgraph initialize */
  138         SI_SUB_DRIVERS          = 0x3100000,    /* Let Drivers initialize */
  139         SI_SUB_CONFIGURE        = 0x3800000,    /* Configure devices */
  140         SI_SUB_VFS              = 0x4000000,    /* virtual filesystem*/
  141         SI_SUB_CLOCKS           = 0x4800000,    /* real time and stat clocks*/
  142         SI_SUB_CLIST            = 0x5800000,    /* clists*/
  143         SI_SUB_SYSV_SHM         = 0x6400000,    /* System V shared memory*/
  144         SI_SUB_SYSV_SEM         = 0x6800000,    /* System V semaphores*/
  145         SI_SUB_SYSV_MSG         = 0x6C00000,    /* System V message queues*/
  146         SI_SUB_P1003_1B         = 0x6E00000,    /* P1003.1B realtime */
  147         SI_SUB_PSEUDO           = 0x7000000,    /* pseudo devices*/
  148         SI_SUB_EXEC             = 0x7400000,    /* execve() handlers */
  149         SI_SUB_PROTO_BEGIN      = 0x8000000,    /* XXX: set splimp (kludge)*/
  150         SI_SUB_PROTO_IF         = 0x8400000,    /* interfaces*/
  151         SI_SUB_PROTO_DOMAIN     = 0x8800000,    /* domains (address families?)*/
  152         SI_SUB_PROTO_IFATTACHDOMAIN     = 0x8800001,    /* domain dependent data init*/
  153         SI_SUB_PROTO_END        = 0x8ffffff,    /* XXX: set splx (kludge)*/
  154         SI_SUB_KPROF            = 0x9000000,    /* kernel profiling*/
  155         SI_SUB_KICK_SCHEDULER   = 0xa000000,    /* start the timeout events*/
  156         SI_SUB_INT_CONFIG_HOOKS = 0xa800000,    /* Interrupts enabled config */
  157         SI_SUB_ROOT_CONF        = 0xb000000,    /* Find root devices */
  158         SI_SUB_DUMP_CONF        = 0xb200000,    /* Find dump devices */
  159         SI_SUB_RAID             = 0xb380000,    /* Configure GEOM classes */
  160         SI_SUB_MOUNT_ROOT       = 0xb400000,    /* root mount*/
  161         SI_SUB_SWAP             = 0xc000000,    /* swap */
  162         SI_SUB_INTRINSIC_POST   = 0xd000000,    /* proc 0 cleanup*/
  163         SI_SUB_SYSCALLS         = 0xd800000,    /* register system calls */
  164         SI_SUB_KTHREAD_INIT     = 0xe000000,    /* init process*/
  165         SI_SUB_KTHREAD_PAGE     = 0xe400000,    /* pageout daemon*/
  166         SI_SUB_KTHREAD_VM       = 0xe800000,    /* vm daemon*/
  167         SI_SUB_KTHREAD_BUF      = 0xea00000,    /* buffer daemon*/
  168         SI_SUB_KTHREAD_UPDATE   = 0xec00000,    /* update daemon*/
  169         SI_SUB_KTHREAD_IDLE     = 0xee00000,    /* idle procs*/
  170         SI_SUB_SMP              = 0xf000000,    /* start the APs*/
  171         SI_SUB_RUN_SCHEDULER    = 0xfffffff     /* scheduler*/
  172 };
  173 
  174 
  175 /*
  176  * Some enumerated orders; "ANY" sorts last.
  177  */
  178 enum sysinit_elem_order {
  179         SI_ORDER_FIRST          = 0x0000000,    /* first*/
  180         SI_ORDER_SECOND         = 0x0000001,    /* second*/
  181         SI_ORDER_THIRD          = 0x0000002,    /* third*/
  182         SI_ORDER_MIDDLE         = 0x1000000,    /* somewhere in the middle */
  183         SI_ORDER_ANY            = 0xfffffff     /* last*/
  184 };
  185 
  186 
  187 /*
  188  * A system initialization call instance
  189  *
  190  * At the moment there is one instance of sysinit.  We probably do not
  191  * want two which is why this code is if'd out, but we definitely want
  192  * to discern SYSINIT's which take non-constant data pointers and
  193  * SYSINIT's which take constant data pointers,
  194  *
  195  * The C_* macros take functions expecting const void * arguments
  196  * while the non-C_* macros take functions expecting just void * arguments.
  197  *
  198  * With -Wcast-qual on, the compiler issues warnings:
  199  *      - if we pass non-const data or functions taking non-const data
  200  *        to a C_* macro.
  201  *
  202  *      - if we pass const data to the normal macros
  203  *
  204  * However, no warning is issued if we pass a function taking const data
  205  * through a normal non-const macro.  This is ok because the function is
  206  * saying it won't modify the data so we don't care whether the data is
  207  * modifiable or not.
  208  */
  209 
  210 typedef void (*sysinit_nfunc_t)(void *);
  211 typedef void (*sysinit_cfunc_t)(const void *);
  212 
  213 struct sysinit {
  214         enum sysinit_sub_id     subsystem;      /* subsystem identifier*/
  215         enum sysinit_elem_order order;          /* init order within subsystem*/
  216         sysinit_cfunc_t func;                   /* function             */
  217         const void      *udata;                 /* multiplexer/argument */
  218 };
  219 
  220 /*
  221  * Default: no special processing
  222  *
  223  * The C_ version of SYSINIT is for data pointers to const
  224  * data ( and functions taking data pointers to const data ).
  225  * At the moment it is no different from SYSINIT and thus
  226  * still results in warnings.
  227  *
  228  * The casts are necessary to have the compiler produce the
  229  * correct warnings when -Wcast-qual is used.
  230  *
  231  */
  232 #define C_SYSINIT(uniquifier, subsystem, order, func, ident)    \
  233         static struct sysinit uniquifier ## _sys_init = {       \
  234                 subsystem,                                      \
  235                 order,                                          \
  236                 func,                                           \
  237                 (ident)                                         \
  238         };                                                      \
  239         DATA_SET(sysinit_set,uniquifier ## _sys_init);
  240 
  241 #define SYSINIT(uniquifier, subsystem, order, func, ident)      \
  242         C_SYSINIT(uniquifier, subsystem, order,                 \
  243         (sysinit_cfunc_t)(sysinit_nfunc_t)func, (void *)(ident))
  244 
  245 /*
  246  * Called on module unload: no special processing
  247  */
  248 #define C_SYSUNINIT(uniquifier, subsystem, order, func, ident)  \
  249         static struct sysinit uniquifier ## _sys_uninit = {     \
  250                 subsystem,                                      \
  251                 order,                                          \
  252                 func,                                           \
  253                 (ident)                                         \
  254         };                                                      \
  255         DATA_SET(sysuninit_set,uniquifier ## _sys_uninit)
  256 
  257 #define SYSUNINIT(uniquifier, subsystem, order, func, ident)    \
  258         C_SYSUNINIT(uniquifier, subsystem, order,               \
  259         (sysinit_cfunc_t)(sysinit_nfunc_t)func, (void *)(ident))
  260 
  261 void    sysinit_add(struct sysinit **set, struct sysinit **set_end);
  262 
  263 /*
  264  * Infrastructure for tunable 'constants'.  Value may be specified at compile
  265  * time or kernel load time.  Rules relating tunables together can be placed
  266  * in a SYSINIT function at SI_SUB_TUNABLES with SI_ORDER_LAST.
  267  *
  268  * WARNING: developers should never use the reserved suffixes specified in
  269  * loader.conf(5) for any tunables or conflicts will result.
  270  */
  271 
  272 /*
  273  * int
  274  * please avoid using for new tunables!
  275  */
  276 extern void tunable_int_init(void *);
  277 struct tunable_int {
  278         const char *path;
  279         int *var;
  280 };
  281 #define TUNABLE_INT(path, var)                                  \
  282         static struct tunable_int __CONCAT(__tunable_int_, __LINE__) = { \
  283                 (path),                                         \
  284                 (var),                                          \
  285         };                                                      \
  286         SYSINIT(__CONCAT(__Tunable_init_, __LINE__),            \
  287             SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_int_init, \
  288             &__CONCAT(__tunable_int_, __LINE__))
  289 
  290 #define TUNABLE_INT_FETCH(path, var)    getenv_int((path), (var))
  291 
  292 /*
  293  * long
  294  */
  295 extern void tunable_long_init(void *);
  296 struct tunable_long {
  297         const char *path;
  298         long *var;
  299 };
  300 #define TUNABLE_LONG(path, var)                                 \
  301         static struct tunable_long __CONCAT(__tunable_long_, __LINE__) = { \
  302                 (path),                                         \
  303                 (var),                                          \
  304         };                                                      \
  305         SYSINIT(__CONCAT(__Tunable_init_, __LINE__),            \
  306             SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_long_init,\
  307             &__CONCAT(__tunable_long_, __LINE__))
  308 
  309 #define TUNABLE_LONG_FETCH(path, var)   getenv_long((path), (var))
  310 
  311 /*
  312  * unsigned long
  313  */
  314 extern void tunable_ulong_init(void *);
  315 struct tunable_ulong {
  316         const char *path;
  317         unsigned long *var;
  318 };
  319 #define TUNABLE_ULONG(path, var)                                \
  320         static struct tunable_ulong __CONCAT(__tunable_ulong_, __LINE__) = { \
  321                 (path),                                         \
  322                 (var),                                          \
  323         };                                                      \
  324         SYSINIT(__CONCAT(__Tunable_init_, __LINE__),            \
  325             SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_ulong_init, \
  326             &__CONCAT(__tunable_ulong_, __LINE__))
  327 
  328 #define TUNABLE_ULONG_FETCH(path, var)  getenv_ulong((path), (var))
  329 
  330 extern void tunable_str_init(void *);
  331 struct tunable_str {
  332         const char *path;
  333         char *var;
  334         int size;
  335 };
  336 #define TUNABLE_STR(path, var, size)                            \
  337         static struct tunable_str __CONCAT(__tunable_str_, __LINE__) = { \
  338                 (path),                                         \
  339                 (var),                                          \
  340                 (size),                                         \
  341         };                                                      \
  342         SYSINIT(__CONCAT(__Tunable_init_, __LINE__),            \
  343             SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_str_init, \
  344             &__CONCAT(__tunable_str_, __LINE__))
  345 
  346 #define TUNABLE_STR_FETCH(path, var, size)                      \
  347         getenv_string((path), (var), (size))
  348 
  349 void    net_warn_not_mpsafe(const char *component);
  350 #define NET_NEEDS_GIANT(component)                                      \
  351         SYSINIT(__CONCAT(__net_warn_not_mpsafe_, __LINE__),             \
  352             SI_SUB_SETTINGS, SI_ORDER_SECOND, net_warn_not_mpsafe, component);
  353 
  354 struct intr_config_hook {
  355         TAILQ_ENTRY(intr_config_hook) ich_links;
  356         void    (*ich_func)(void *arg);
  357         void    *ich_arg;
  358 };
  359 
  360 int     config_intrhook_establish(struct intr_config_hook *hook);
  361 void    config_intrhook_disestablish(struct intr_config_hook *hook);
  362 
  363 #endif /* !_SYS_KERNEL_H_*/

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