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: releng/9.0/sys/sys/kernel.h 220137 2011-03-29 17:47:25Z trasz $
   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 char kernelname[MAXPATHLEN];
   59 
   60 extern int tick;                        /* usec per tick (1000000 / hz) */
   61 extern int hz;                          /* system clock's frequency */
   62 extern int psratio;                     /* ratio: prof / stat */
   63 extern int stathz;                      /* statistics clock's frequency */
   64 extern int profhz;                      /* profiling clock's frequency */
   65 extern int profprocs;                   /* number of process's profiling */
   66 extern int ticks;
   67 
   68 #endif /* _KERNEL */
   69 
   70 /*
   71  * Enumerated types for known system startup interfaces.
   72  *
   73  * Startup occurs in ascending numeric order; the list entries are
   74  * sorted prior to attempting startup to guarantee order.  Items
   75  * of the same level are arbitrated for order based on the 'order'
   76  * element.
   77  *
   78  * These numbers are arbitrary and are chosen ONLY for ordering; the
   79  * enumeration values are explicit rather than implicit to provide
   80  * for binary compatibility with inserted elements.
   81  *
   82  * The SI_SUB_RUN_SCHEDULER value must have the highest lexical value.
   83  *
   84  * The SI_SUB_SWAP values represent a value used by
   85  * the BSD 4.4Lite but not by FreeBSD; it is maintained in dependent
   86  * order to support porting.
   87  *
   88  * The SI_SUB_PROTO_BEGIN and SI_SUB_PROTO_END bracket a range of
   89  * initializations to take place at splimp().  This is a historical
   90  * wart that should be removed -- probably running everything at
   91  * splimp() until the first init that doesn't want it is the correct
   92  * fix.  They are currently present to ensure historical behavior.
   93  */
   94 enum sysinit_sub_id {
   95         SI_SUB_DUMMY            = 0x0000000,    /* not executed; for linker*/
   96         SI_SUB_DONE             = 0x0000001,    /* processed*/
   97         SI_SUB_TUNABLES         = 0x0700000,    /* establish tunable values */
   98         SI_SUB_COPYRIGHT        = 0x0800001,    /* first use of console*/
   99         SI_SUB_SETTINGS         = 0x0880000,    /* check and recheck settings */
  100         SI_SUB_MTX_POOL_STATIC  = 0x0900000,    /* static mutex pool */
  101         SI_SUB_LOCKMGR          = 0x0980000,    /* lockmgr locks */
  102         SI_SUB_VM               = 0x1000000,    /* virtual memory system init*/
  103         SI_SUB_KMEM             = 0x1800000,    /* kernel memory*/
  104         SI_SUB_KVM_RSRC         = 0x1A00000,    /* kvm operational limits*/
  105         SI_SUB_WITNESS          = 0x1A80000,    /* witness initialization */
  106         SI_SUB_MTX_POOL_DYNAMIC = 0x1AC0000,    /* dynamic mutex pool */
  107         SI_SUB_LOCK             = 0x1B00000,    /* various locks */
  108         SI_SUB_EVENTHANDLER     = 0x1C00000,    /* eventhandler init */
  109         SI_SUB_VNET_PRELINK     = 0x1E00000,    /* vnet init before modules */
  110         SI_SUB_KLD              = 0x2000000,    /* KLD and module setup */
  111         SI_SUB_CPU              = 0x2100000,    /* CPU resource(s)*/
  112         SI_SUB_RACCT            = 0x2110000,    /* resource accounting */
  113         SI_SUB_RANDOM           = 0x2120000,    /* random number generator */
  114         SI_SUB_KDTRACE          = 0x2140000,    /* Kernel dtrace hooks */
  115         SI_SUB_MAC              = 0x2180000,    /* TrustedBSD MAC subsystem */
  116         SI_SUB_MAC_POLICY       = 0x21C0000,    /* TrustedBSD MAC policies */
  117         SI_SUB_MAC_LATE         = 0x21D0000,    /* TrustedBSD MAC subsystem */
  118         SI_SUB_VNET             = 0x21E0000,    /* vnet 0 */
  119         SI_SUB_INTRINSIC        = 0x2200000,    /* proc 0*/
  120         SI_SUB_VM_CONF          = 0x2300000,    /* config VM, set limits*/
  121         SI_SUB_DDB_SERVICES     = 0x2380000,    /* capture, scripting, etc. */
  122         SI_SUB_RUN_QUEUE        = 0x2400000,    /* set up run queue*/
  123         SI_SUB_KTRACE           = 0x2480000,    /* ktrace */
  124         SI_SUB_OPENSOLARIS      = 0x2490000,    /* OpenSolaris compatibility */
  125         SI_SUB_CYCLIC           = 0x24A0000,    /* Cyclic timers */
  126         SI_SUB_AUDIT            = 0x24C0000,    /* audit */
  127         SI_SUB_CREATE_INIT      = 0x2500000,    /* create init process*/
  128         SI_SUB_SCHED_IDLE       = 0x2600000,    /* required idle procs */
  129         SI_SUB_MBUF             = 0x2700000,    /* mbuf subsystem */
  130         SI_SUB_INTR             = 0x2800000,    /* interrupt threads */
  131         SI_SUB_SOFTINTR         = 0x2800001,    /* start soft interrupt thread */
  132         SI_SUB_ACL              = 0x2900000,    /* start for filesystem ACLs */
  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_DTRACE           = 0x3020000,    /* DTrace subsystem */
  137         SI_SUB_DTRACE_PROVIDER  = 0x3048000,    /* DTrace providers */
  138         SI_SUB_DTRACE_ANON      = 0x308C000,    /* DTrace anon enabling */
  139         SI_SUB_DRIVERS          = 0x3100000,    /* Let Drivers initialize */
  140         SI_SUB_CONFIGURE        = 0x3800000,    /* Configure devices */
  141         SI_SUB_VFS              = 0x4000000,    /* virtual filesystem*/
  142         SI_SUB_CLOCKS           = 0x4800000,    /* real time and stat clocks*/
  143         SI_SUB_CLIST            = 0x5800000,    /* clists*/
  144         SI_SUB_SYSV_SHM         = 0x6400000,    /* System V shared memory*/
  145         SI_SUB_SYSV_SEM         = 0x6800000,    /* System V semaphores*/
  146         SI_SUB_SYSV_MSG         = 0x6C00000,    /* System V message queues*/
  147         SI_SUB_P1003_1B         = 0x6E00000,    /* P1003.1B realtime */
  148         SI_SUB_PSEUDO           = 0x7000000,    /* pseudo devices*/
  149         SI_SUB_EXEC             = 0x7400000,    /* execve() handlers */
  150         SI_SUB_PROTO_BEGIN      = 0x8000000,    /* XXX: set splimp (kludge)*/
  151         SI_SUB_PROTO_IF         = 0x8400000,    /* interfaces*/
  152         SI_SUB_PROTO_DOMAININIT = 0x8600000,    /* domain registration system */
  153         SI_SUB_PROTO_DOMAIN     = 0x8800000,    /* domains (address families?)*/
  154         SI_SUB_PROTO_IFATTACHDOMAIN     = 0x8800001,    /* domain dependent data init*/
  155         SI_SUB_PROTO_END        = 0x8ffffff,    /* XXX: set splx (kludge)*/
  156         SI_SUB_KPROF            = 0x9000000,    /* kernel profiling*/
  157         SI_SUB_KICK_SCHEDULER   = 0xa000000,    /* start the timeout events*/
  158         SI_SUB_INT_CONFIG_HOOKS = 0xa800000,    /* Interrupts enabled config */
  159         SI_SUB_ROOT_CONF        = 0xb000000,    /* Find root devices */
  160         SI_SUB_DUMP_CONF        = 0xb200000,    /* Find dump devices */
  161         SI_SUB_RAID             = 0xb380000,    /* Configure GEOM classes */
  162         SI_SUB_SWAP             = 0xc000000,    /* swap */
  163         SI_SUB_INTRINSIC_POST   = 0xd000000,    /* proc 0 cleanup*/
  164         SI_SUB_SYSCALLS         = 0xd800000,    /* register system calls */
  165         SI_SUB_VNET_DONE        = 0xdc00000,    /* vnet registration complete */
  166         SI_SUB_KTHREAD_INIT     = 0xe000000,    /* init process*/
  167         SI_SUB_KTHREAD_PAGE     = 0xe400000,    /* pageout daemon*/
  168         SI_SUB_KTHREAD_VM       = 0xe800000,    /* vm daemon*/
  169         SI_SUB_KTHREAD_BUF      = 0xea00000,    /* buffer daemon*/
  170         SI_SUB_KTHREAD_UPDATE   = 0xec00000,    /* update daemon*/
  171         SI_SUB_KTHREAD_IDLE     = 0xee00000,    /* idle procs*/
  172         SI_SUB_SMP              = 0xf000000,    /* start the APs*/
  173         SI_SUB_RACCTD           = 0xf100000,    /* start raccd*/
  174         SI_SUB_RUN_SCHEDULER    = 0xfffffff     /* scheduler*/
  175 };
  176 
  177 
  178 /*
  179  * Some enumerated orders; "ANY" sorts last.
  180  */
  181 enum sysinit_elem_order {
  182         SI_ORDER_FIRST          = 0x0000000,    /* first*/
  183         SI_ORDER_SECOND         = 0x0000001,    /* second*/
  184         SI_ORDER_THIRD          = 0x0000002,    /* third*/
  185         SI_ORDER_FOURTH         = 0x0000003,    /* fourth*/
  186         SI_ORDER_MIDDLE         = 0x1000000,    /* somewhere in the middle */
  187         SI_ORDER_ANY            = 0xfffffff     /* last*/
  188 };
  189 
  190 
  191 /*
  192  * A system initialization call instance
  193  *
  194  * At the moment there is one instance of sysinit.  We probably do not
  195  * want two which is why this code is if'd out, but we definitely want
  196  * to discern SYSINIT's which take non-constant data pointers and
  197  * SYSINIT's which take constant data pointers,
  198  *
  199  * The C_* macros take functions expecting const void * arguments
  200  * while the non-C_* macros take functions expecting just void * arguments.
  201  *
  202  * With -Wcast-qual on, the compiler issues warnings:
  203  *      - if we pass non-const data or functions taking non-const data
  204  *        to a C_* macro.
  205  *
  206  *      - if we pass const data to the normal macros
  207  *
  208  * However, no warning is issued if we pass a function taking const data
  209  * through a normal non-const macro.  This is ok because the function is
  210  * saying it won't modify the data so we don't care whether the data is
  211  * modifiable or not.
  212  */
  213 
  214 typedef void (*sysinit_nfunc_t)(void *);
  215 typedef void (*sysinit_cfunc_t)(const void *);
  216 
  217 struct sysinit {
  218         enum sysinit_sub_id     subsystem;      /* subsystem identifier*/
  219         enum sysinit_elem_order order;          /* init order within subsystem*/
  220         sysinit_cfunc_t func;                   /* function             */
  221         const void      *udata;                 /* multiplexer/argument */
  222 };
  223 
  224 /*
  225  * Default: no special processing
  226  *
  227  * The C_ version of SYSINIT is for data pointers to const
  228  * data ( and functions taking data pointers to const data ).
  229  * At the moment it is no different from SYSINIT and thus
  230  * still results in warnings.
  231  *
  232  * The casts are necessary to have the compiler produce the
  233  * correct warnings when -Wcast-qual is used.
  234  *
  235  */
  236 #define C_SYSINIT(uniquifier, subsystem, order, func, ident)    \
  237         static struct sysinit uniquifier ## _sys_init = {       \
  238                 subsystem,                                      \
  239                 order,                                          \
  240                 func,                                           \
  241                 (ident)                                         \
  242         };                                                      \
  243         DATA_SET(sysinit_set,uniquifier ## _sys_init)
  244 
  245 #define SYSINIT(uniquifier, subsystem, order, func, ident)      \
  246         C_SYSINIT(uniquifier, subsystem, order,                 \
  247         (sysinit_cfunc_t)(sysinit_nfunc_t)func, (void *)(ident))
  248 
  249 /*
  250  * Called on module unload: no special processing
  251  */
  252 #define C_SYSUNINIT(uniquifier, subsystem, order, func, ident)  \
  253         static struct sysinit uniquifier ## _sys_uninit = {     \
  254                 subsystem,                                      \
  255                 order,                                          \
  256                 func,                                           \
  257                 (ident)                                         \
  258         };                                                      \
  259         DATA_SET(sysuninit_set,uniquifier ## _sys_uninit)
  260 
  261 #define SYSUNINIT(uniquifier, subsystem, order, func, ident)    \
  262         C_SYSUNINIT(uniquifier, subsystem, order,               \
  263         (sysinit_cfunc_t)(sysinit_nfunc_t)func, (void *)(ident))
  264 
  265 void    sysinit_add(struct sysinit **set, struct sysinit **set_end);
  266 
  267 /*
  268  * Infrastructure for tunable 'constants'.  Value may be specified at compile
  269  * time or kernel load time.  Rules relating tunables together can be placed
  270  * in a SYSINIT function at SI_SUB_TUNABLES with SI_ORDER_LAST.
  271  *
  272  * WARNING: developers should never use the reserved suffixes specified in
  273  * loader.conf(5) for any tunables or conflicts will result.
  274  */
  275 
  276 /*
  277  * int
  278  * please avoid using for new tunables!
  279  */
  280 extern void tunable_int_init(void *);
  281 struct tunable_int {
  282         const char *path;
  283         int *var;
  284 };
  285 #define TUNABLE_INT(path, var)                                  \
  286         static struct tunable_int __CONCAT(__tunable_int_, __LINE__) = { \
  287                 (path),                                         \
  288                 (var),                                          \
  289         };                                                      \
  290         SYSINIT(__CONCAT(__Tunable_init_, __LINE__),            \
  291             SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_int_init, \
  292             &__CONCAT(__tunable_int_, __LINE__))
  293 
  294 #define TUNABLE_INT_FETCH(path, var)    getenv_int((path), (var))
  295 
  296 /*
  297  * long
  298  */
  299 extern void tunable_long_init(void *);
  300 struct tunable_long {
  301         const char *path;
  302         long *var;
  303 };
  304 #define TUNABLE_LONG(path, var)                                 \
  305         static struct tunable_long __CONCAT(__tunable_long_, __LINE__) = { \
  306                 (path),                                         \
  307                 (var),                                          \
  308         };                                                      \
  309         SYSINIT(__CONCAT(__Tunable_init_, __LINE__),            \
  310             SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_long_init,\
  311             &__CONCAT(__tunable_long_, __LINE__))
  312 
  313 #define TUNABLE_LONG_FETCH(path, var)   getenv_long((path), (var))
  314 
  315 /*
  316  * unsigned long
  317  */
  318 extern void tunable_ulong_init(void *);
  319 struct tunable_ulong {
  320         const char *path;
  321         unsigned long *var;
  322 };
  323 #define TUNABLE_ULONG(path, var)                                \
  324         static struct tunable_ulong __CONCAT(__tunable_ulong_, __LINE__) = { \
  325                 (path),                                         \
  326                 (var),                                          \
  327         };                                                      \
  328         SYSINIT(__CONCAT(__Tunable_init_, __LINE__),            \
  329             SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_ulong_init, \
  330             &__CONCAT(__tunable_ulong_, __LINE__))
  331 
  332 #define TUNABLE_ULONG_FETCH(path, var)  getenv_ulong((path), (var))
  333 
  334 /*
  335  * quad
  336  */
  337 extern void tunable_quad_init(void *);
  338 struct tunable_quad {
  339         const char *path;
  340         quad_t *var;
  341 };
  342 #define TUNABLE_QUAD(path, var)                                 \
  343         static struct tunable_quad __CONCAT(__tunable_quad_, __LINE__) = { \
  344                 (path),                                         \
  345                 (var),                                          \
  346         };                                                      \
  347         SYSINIT(__CONCAT(__Tunable_init_, __LINE__),            \
  348             SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_quad_init, \
  349             &__CONCAT(__tunable_quad_, __LINE__))
  350 
  351 #define TUNABLE_QUAD_FETCH(path, var)   getenv_quad((path), (var))
  352 
  353 extern void tunable_str_init(void *);
  354 struct tunable_str {
  355         const char *path;
  356         char *var;
  357         int size;
  358 };
  359 #define TUNABLE_STR(path, var, size)                            \
  360         static struct tunable_str __CONCAT(__tunable_str_, __LINE__) = { \
  361                 (path),                                         \
  362                 (var),                                          \
  363                 (size),                                         \
  364         };                                                      \
  365         SYSINIT(__CONCAT(__Tunable_init_, __LINE__),            \
  366             SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_str_init, \
  367             &__CONCAT(__tunable_str_, __LINE__))
  368 
  369 #define TUNABLE_STR_FETCH(path, var, size)                      \
  370         getenv_string((path), (var), (size))
  371 
  372 struct intr_config_hook {
  373         TAILQ_ENTRY(intr_config_hook) ich_links;
  374         void    (*ich_func)(void *arg);
  375         void    *ich_arg;
  376 };
  377 
  378 int     config_intrhook_establish(struct intr_config_hook *hook);
  379 void    config_intrhook_disestablish(struct intr_config_hook *hook);
  380 
  381 #endif /* !_SYS_KERNEL_H_*/

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