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  * SPDX-License-Identifier: BSD-4-Clause
    3  *
    4  * Copyright (c) 1995 Terrence R. Lambert
    5  * All rights reserved.
    6  *
    7  * Copyright (c) 1990, 1993
    8  *      The Regents of the University of California.  All rights reserved.
    9  * (c) UNIX System Laboratories, Inc.
   10  * All or some portions of this file are derived from material licensed
   11  * to the University of California by American Telephone and Telegraph
   12  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   13  * the permission of UNIX System Laboratories, Inc.
   14  *
   15  * Redistribution and use in source and binary forms, with or without
   16  * modification, are permitted provided that the following conditions
   17  * are met:
   18  * 1. Redistributions of source code must retain the above copyright
   19  *    notice, this list of conditions and the following disclaimer.
   20  * 2. Redistributions in binary form must reproduce the above copyright
   21  *    notice, this list of conditions and the following disclaimer in the
   22  *    documentation and/or other materials provided with the distribution.
   23  * 3. All advertising materials mentioning features or use of this software
   24  *    must display the following acknowledgement:
   25  *      This product includes software developed by the University of
   26  *      California, Berkeley and its contributors.
   27  * 4. Neither the name of the University nor the names of its contributors
   28  *    may be used to endorse or promote products derived from this software
   29  *    without specific prior written permission.
   30  *
   31  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   32  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   33  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   34  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   35  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   39  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   40  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   41  * SUCH DAMAGE.
   42  *
   43  *      @(#)kernel.h    8.3 (Berkeley) 1/21/94
   44  * $FreeBSD: head/sys/sys/kernel.h 331290 2018-03-21 10:26:39Z kib $
   45  */
   46 
   47 #ifndef _SYS_KERNEL_H_
   48 #define _SYS_KERNEL_H_
   49 
   50 #include <sys/linker_set.h>
   51 
   52 #ifdef _KERNEL
   53 
   54 /* for intrhook below */
   55 #include <sys/queue.h>
   56 
   57 /* for timestamping SYSINITs; other files may assume this is included here */
   58 #include <sys/tslog.h>
   59 
   60 /* Global variables for the kernel. */
   61 
   62 /* 1.1 */
   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 volatile int ticks;
   72 
   73 #endif /* _KERNEL */
   74 
   75 /*
   76  * Enumerated types for known system startup interfaces.
   77  *
   78  * Startup occurs in ascending numeric order; the list entries are
   79  * sorted prior to attempting startup to guarantee order.  Items
   80  * of the same level are arbitrated for order based on the 'order'
   81  * element.
   82  *
   83  * These numbers are arbitrary and are chosen ONLY for ordering; the
   84  * enumeration values are explicit rather than implicit to provide
   85  * for binary compatibility with inserted elements.
   86  *
   87  * The SI_SUB_LAST value must have the highest lexical value.
   88  */
   89 enum sysinit_sub_id {
   90         SI_SUB_DUMMY            = 0x0000000,    /* not executed; for linker*/
   91         SI_SUB_DONE             = 0x0000001,    /* processed*/
   92         SI_SUB_TUNABLES         = 0x0700000,    /* establish tunable values */
   93         SI_SUB_COPYRIGHT        = 0x0800001,    /* first use of console*/
   94         SI_SUB_VM               = 0x1000000,    /* virtual memory system init*/
   95         SI_SUB_KMEM             = 0x1800000,    /* kernel memory*/
   96         SI_SUB_HYPERVISOR       = 0x1A40000,    /*
   97                                                  * Hypervisor detection and
   98                                                  * virtualization support 
   99                                                  * setup.
  100                                                  */
  101         SI_SUB_WITNESS          = 0x1A80000,    /* witness initialization */
  102         SI_SUB_MTX_POOL_DYNAMIC = 0x1AC0000,    /* dynamic mutex pool */
  103         SI_SUB_LOCK             = 0x1B00000,    /* various locks */
  104         SI_SUB_EVENTHANDLER     = 0x1C00000,    /* eventhandler init */
  105         SI_SUB_VNET_PRELINK     = 0x1E00000,    /* vnet init before modules */
  106         SI_SUB_KLD              = 0x2000000,    /* KLD and module setup */
  107         SI_SUB_CPU              = 0x2100000,    /* CPU resource(s)*/
  108         SI_SUB_RACCT            = 0x2110000,    /* resource accounting */
  109         SI_SUB_KDTRACE          = 0x2140000,    /* Kernel dtrace hooks */
  110         SI_SUB_RANDOM           = 0x2160000,    /* random number generator */
  111         SI_SUB_MAC              = 0x2180000,    /* TrustedBSD MAC subsystem */
  112         SI_SUB_MAC_POLICY       = 0x21C0000,    /* TrustedBSD MAC policies */
  113         SI_SUB_MAC_LATE         = 0x21D0000,    /* TrustedBSD MAC subsystem */
  114         SI_SUB_VNET             = 0x21E0000,    /* vnet 0 */
  115         SI_SUB_INTRINSIC        = 0x2200000,    /* proc 0*/
  116         SI_SUB_VM_CONF          = 0x2300000,    /* config VM, set limits*/
  117         SI_SUB_DDB_SERVICES     = 0x2380000,    /* capture, scripting, etc. */
  118         SI_SUB_RUN_QUEUE        = 0x2400000,    /* set up run queue*/
  119         SI_SUB_KTRACE           = 0x2480000,    /* ktrace */
  120         SI_SUB_OPENSOLARIS      = 0x2490000,    /* OpenSolaris compatibility */
  121         SI_SUB_AUDIT            = 0x24C0000,    /* audit */
  122         SI_SUB_CREATE_INIT      = 0x2500000,    /* create init process*/
  123         SI_SUB_SCHED_IDLE       = 0x2600000,    /* required idle procs */
  124         SI_SUB_MBUF             = 0x2700000,    /* mbuf subsystem */
  125         SI_SUB_INTR             = 0x2800000,    /* interrupt threads */
  126         SI_SUB_TASKQ            = 0x2880000,    /* task queues */
  127 #ifdef EARLY_AP_STARTUP
  128         SI_SUB_SMP              = 0x2900000,    /* start the APs*/
  129 #endif
  130         SI_SUB_SOFTINTR         = 0x2A00000,    /* start soft interrupt thread */
  131         SI_SUB_DEVFS            = 0x2F00000,    /* devfs ready for devices */
  132         SI_SUB_INIT_IF          = 0x3000000,    /* prep for net interfaces */
  133         SI_SUB_NETGRAPH         = 0x3010000,    /* Let Netgraph initialize */
  134         SI_SUB_DTRACE           = 0x3020000,    /* DTrace subsystem */
  135         SI_SUB_DTRACE_PROVIDER  = 0x3048000,    /* DTrace providers */
  136         SI_SUB_DTRACE_ANON      = 0x308C000,    /* DTrace anon enabling */
  137         SI_SUB_DRIVERS          = 0x3100000,    /* Let Drivers initialize */
  138         SI_SUB_CONFIGURE        = 0x3800000,    /* Configure devices */
  139         SI_SUB_VFS              = 0x4000000,    /* virtual filesystem*/
  140         SI_SUB_CLOCKS           = 0x4800000,    /* real time and stat clocks*/
  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,    /* VNET initialization */
  148         SI_SUB_PROTO_PFIL       = 0x8100000,    /* Initialize pfil before FWs */
  149         SI_SUB_PROTO_IF         = 0x8400000,    /* interfaces*/
  150         SI_SUB_PROTO_DOMAININIT = 0x8600000,    /* domain registration system */
  151         SI_SUB_PROTO_MC         = 0x8700000,    /* Multicast */
  152         SI_SUB_PROTO_DOMAIN     = 0x8800000,    /* domains (address families?)*/
  153         SI_SUB_PROTO_FIREWALL   = 0x8806000,    /* Firewalls */
  154         SI_SUB_PROTO_IFATTACHDOMAIN = 0x8808000,/* domain dependent data init */
  155         SI_SUB_PROTO_END        = 0x8ffffff,    /* VNET helper functions */
  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_INTRINSIC_POST   = 0xd000000,    /* proc 0 cleanup*/
  161         SI_SUB_SYSCALLS         = 0xd800000,    /* register system calls */
  162         SI_SUB_VNET_DONE        = 0xdc00000,    /* vnet registration complete */
  163         SI_SUB_KTHREAD_INIT     = 0xe000000,    /* init process*/
  164         SI_SUB_KTHREAD_PAGE     = 0xe400000,    /* pageout daemon*/
  165         SI_SUB_KTHREAD_VM       = 0xe800000,    /* vm daemon*/
  166         SI_SUB_KTHREAD_BUF      = 0xea00000,    /* buffer daemon*/
  167         SI_SUB_KTHREAD_UPDATE   = 0xec00000,    /* update daemon*/
  168         SI_SUB_KTHREAD_IDLE     = 0xee00000,    /* idle procs*/
  169 #ifndef EARLY_AP_STARTUP
  170         SI_SUB_SMP              = 0xf000000,    /* start the APs*/
  171 #endif  
  172         SI_SUB_RACCTD           = 0xf100000,    /* start racctd*/
  173         SI_SUB_LAST             = 0xfffffff     /* final initialization */
  174 };
  175 
  176 
  177 /*
  178  * Some enumerated orders; "ANY" sorts last.
  179  */
  180 enum sysinit_elem_order {
  181         SI_ORDER_FIRST          = 0x0000000,    /* first*/
  182         SI_ORDER_SECOND         = 0x0000001,    /* second*/
  183         SI_ORDER_THIRD          = 0x0000002,    /* third*/
  184         SI_ORDER_FOURTH         = 0x0000003,    /* fourth*/
  185         SI_ORDER_MIDDLE         = 0x1000000,    /* somewhere in the middle */
  186         SI_ORDER_ANY            = 0xfffffff     /* last*/
  187 };
  188 
  189 
  190 /*
  191  * A system initialization call instance
  192  *
  193  * At the moment there is one instance of sysinit.  We probably do not
  194  * want two which is why this code is if'd out, but we definitely want
  195  * to discern SYSINIT's which take non-constant data pointers and
  196  * SYSINIT's which take constant data pointers,
  197  *
  198  * The C_* macros take functions expecting const void * arguments
  199  * while the non-C_* macros take functions expecting just void * arguments.
  200  *
  201  * With -Wcast-qual on, the compiler issues warnings:
  202  *      - if we pass non-const data or functions taking non-const data
  203  *        to a C_* macro.
  204  *
  205  *      - if we pass const data to the normal macros
  206  *
  207  * However, no warning is issued if we pass a function taking const data
  208  * through a normal non-const macro.  This is ok because the function is
  209  * saying it won't modify the data so we don't care whether the data is
  210  * modifiable or not.
  211  */
  212 
  213 typedef void (*sysinit_nfunc_t)(void *);
  214 typedef void (*sysinit_cfunc_t)(const void *);
  215 
  216 struct sysinit {
  217         enum sysinit_sub_id     subsystem;      /* subsystem identifier*/
  218         enum sysinit_elem_order order;          /* init order within subsystem*/
  219         sysinit_cfunc_t func;                   /* function             */
  220         const void      *udata;                 /* multiplexer/argument */
  221 };
  222 
  223 /*
  224  * Default: no special processing
  225  *
  226  * The C_ version of SYSINIT is for data pointers to const
  227  * data ( and functions taking data pointers to const data ).
  228  * At the moment it is no different from SYSINIT and thus
  229  * still results in warnings.
  230  *
  231  * The casts are necessary to have the compiler produce the
  232  * correct warnings when -Wcast-qual is used.
  233  *
  234  */
  235 #ifdef TSLOG
  236 struct sysinit_tslog {
  237         sysinit_cfunc_t func;
  238         const void * data;
  239         const char * name;
  240 };
  241 static inline void
  242 sysinit_tslog_shim(const void * data)
  243 {
  244         const struct sysinit_tslog * x = data;
  245 
  246         TSRAW(curthread, TS_ENTER, "SYSINIT", x->name);
  247         (x->func)(x->data);
  248         TSRAW(curthread, TS_EXIT, "SYSINIT", x->name);
  249 }
  250 #define C_SYSINIT(uniquifier, subsystem, order, func, ident)    \
  251         static struct sysinit_tslog uniquifier ## _sys_init_tslog = {   \
  252                 func,                                           \
  253                 (ident),                                        \
  254                 #uniquifier                                     \
  255         };                                                      \
  256         static struct sysinit uniquifier ## _sys_init = {       \
  257                 subsystem,                                      \
  258                 order,                                          \
  259                 sysinit_tslog_shim,                             \
  260                 &uniquifier ## _sys_init_tslog                  \
  261         };                                                      \
  262         DATA_WSET(sysinit_set,uniquifier ## _sys_init)
  263 #else
  264 #define C_SYSINIT(uniquifier, subsystem, order, func, ident)    \
  265         static struct sysinit uniquifier ## _sys_init = {       \
  266                 subsystem,                                      \
  267                 order,                                          \
  268                 func,                                           \
  269                 (ident)                                         \
  270         };                                                      \
  271         DATA_WSET(sysinit_set,uniquifier ## _sys_init)
  272 #endif
  273 
  274 #define SYSINIT(uniquifier, subsystem, order, func, ident)      \
  275         C_SYSINIT(uniquifier, subsystem, order,                 \
  276         (sysinit_cfunc_t)(sysinit_nfunc_t)func, (void *)(ident))
  277 
  278 /*
  279  * Called on module unload: no special processing
  280  */
  281 #define C_SYSUNINIT(uniquifier, subsystem, order, func, ident)  \
  282         static struct sysinit uniquifier ## _sys_uninit = {     \
  283                 subsystem,                                      \
  284                 order,                                          \
  285                 func,                                           \
  286                 (ident)                                         \
  287         };                                                      \
  288         DATA_WSET(sysuninit_set,uniquifier ## _sys_uninit)
  289 
  290 #define SYSUNINIT(uniquifier, subsystem, order, func, ident)    \
  291         C_SYSUNINIT(uniquifier, subsystem, order,               \
  292         (sysinit_cfunc_t)(sysinit_nfunc_t)func, (void *)(ident))
  293 
  294 void    sysinit_add(struct sysinit **set, struct sysinit **set_end);
  295 
  296 /*
  297  * Infrastructure for tunable 'constants'.  Value may be specified at compile
  298  * time or kernel load time.  Rules relating tunables together can be placed
  299  * in a SYSINIT function at SI_SUB_TUNABLES with SI_ORDER_ANY.
  300  *
  301  * WARNING: developers should never use the reserved suffixes specified in
  302  * loader.conf(5) for any tunables or conflicts will result.
  303  */
  304 
  305 /*
  306  * int
  307  * please avoid using for new tunables!
  308  */
  309 extern void tunable_int_init(void *);
  310 struct tunable_int {
  311         const char *path;
  312         int *var;
  313 };
  314 #define TUNABLE_INT(path, var)                                  \
  315         static struct tunable_int __CONCAT(__tunable_int_, __LINE__) = { \
  316                 (path),                                         \
  317                 (var),                                          \
  318         };                                                      \
  319         SYSINIT(__CONCAT(__Tunable_init_, __LINE__),            \
  320             SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_int_init, \
  321             &__CONCAT(__tunable_int_, __LINE__))
  322 
  323 #define TUNABLE_INT_FETCH(path, var)    getenv_int((path), (var))
  324 
  325 /*
  326  * long
  327  */
  328 extern void tunable_long_init(void *);
  329 struct tunable_long {
  330         const char *path;
  331         long *var;
  332 };
  333 #define TUNABLE_LONG(path, var)                                 \
  334         static struct tunable_long __CONCAT(__tunable_long_, __LINE__) = { \
  335                 (path),                                         \
  336                 (var),                                          \
  337         };                                                      \
  338         SYSINIT(__CONCAT(__Tunable_init_, __LINE__),            \
  339             SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_long_init,\
  340             &__CONCAT(__tunable_long_, __LINE__))
  341 
  342 #define TUNABLE_LONG_FETCH(path, var)   getenv_long((path), (var))
  343 
  344 /*
  345  * unsigned long
  346  */
  347 extern void tunable_ulong_init(void *);
  348 struct tunable_ulong {
  349         const char *path;
  350         unsigned long *var;
  351 };
  352 #define TUNABLE_ULONG(path, var)                                \
  353         static struct tunable_ulong __CONCAT(__tunable_ulong_, __LINE__) = { \
  354                 (path),                                         \
  355                 (var),                                          \
  356         };                                                      \
  357         SYSINIT(__CONCAT(__Tunable_init_, __LINE__),            \
  358             SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_ulong_init, \
  359             &__CONCAT(__tunable_ulong_, __LINE__))
  360 
  361 #define TUNABLE_ULONG_FETCH(path, var)  getenv_ulong((path), (var))
  362 
  363 /*
  364  * int64_t
  365  */
  366 extern void tunable_int64_init(void *);
  367 struct tunable_int64 {
  368         const char *path;
  369         int64_t *var;
  370 };
  371 #define TUNABLE_INT64(path, var)                                \
  372         static struct tunable_int64 __CONCAT(__tunable_int64_, __LINE__) = { \
  373                 (path),                                         \
  374                 (var),                                          \
  375         };                                                      \
  376         SYSINIT(__CONCAT(__Tunable_init_, __LINE__),            \
  377             SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_int64_init, \
  378             &__CONCAT(__tunable_int64_, __LINE__))
  379 
  380 #define TUNABLE_INT64_FETCH(path, var)  getenv_int64((path), (var))
  381 
  382 /*
  383  * uint64_t
  384  */
  385 extern void tunable_uint64_init(void *);
  386 struct tunable_uint64 {
  387         const char *path;
  388         uint64_t *var;
  389 };
  390 #define TUNABLE_UINT64(path, var)                               \
  391         static struct tunable_uint64 __CONCAT(__tunable_uint64_, __LINE__) = { \
  392                 (path),                                         \
  393                 (var),                                          \
  394         };                                                      \
  395         SYSINIT(__CONCAT(__Tunable_init_, __LINE__),            \
  396             SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_uint64_init, \
  397             &__CONCAT(__tunable_uint64_, __LINE__))
  398 
  399 #define TUNABLE_UINT64_FETCH(path, var) getenv_uint64((path), (var))
  400 
  401 /*
  402  * quad
  403  */
  404 extern void tunable_quad_init(void *);
  405 struct tunable_quad {
  406         const char *path;
  407         quad_t *var;
  408 };
  409 #define TUNABLE_QUAD(path, var)                                 \
  410         static struct tunable_quad __CONCAT(__tunable_quad_, __LINE__) = { \
  411                 (path),                                         \
  412                 (var),                                          \
  413         };                                                      \
  414         SYSINIT(__CONCAT(__Tunable_init_, __LINE__),            \
  415             SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_quad_init, \
  416             &__CONCAT(__tunable_quad_, __LINE__))
  417 
  418 #define TUNABLE_QUAD_FETCH(path, var)   getenv_quad((path), (var))
  419 
  420 extern void tunable_str_init(void *);
  421 struct tunable_str {
  422         const char *path;
  423         char *var;
  424         int size;
  425 };
  426 #define TUNABLE_STR(path, var, size)                            \
  427         static struct tunable_str __CONCAT(__tunable_str_, __LINE__) = { \
  428                 (path),                                         \
  429                 (var),                                          \
  430                 (size),                                         \
  431         };                                                      \
  432         SYSINIT(__CONCAT(__Tunable_init_, __LINE__),            \
  433             SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_str_init, \
  434             &__CONCAT(__tunable_str_, __LINE__))
  435 
  436 #define TUNABLE_STR_FETCH(path, var, size)                      \
  437         getenv_string((path), (var), (size))
  438 
  439 typedef void (*ich_func_t)(void *_arg);
  440 
  441 struct intr_config_hook {
  442         TAILQ_ENTRY(intr_config_hook) ich_links;
  443         ich_func_t      ich_func;
  444         void            *ich_arg;
  445 };
  446 
  447 int     config_intrhook_establish(struct intr_config_hook *hook);
  448 void    config_intrhook_disestablish(struct intr_config_hook *hook);
  449 void    config_intrhook_oneshot(ich_func_t _func, void *_arg);
  450 
  451 #endif /* !_SYS_KERNEL_H_*/

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