2 * Copyright (c) 1995 Terrence R. Lambert
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.
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
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.
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30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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41 * @(#)kernel.h 8.3 (Berkeley) 1/21/94
45 #ifndef _SYS_KERNEL_H_
46 #define _SYS_KERNEL_H_
48 #include <sys/linker_set.h>
52 /* for intrhook below */
53 #include <sys/queue.h>
56 #include <sys/module.h>
58 /* Global variables for the kernel. */
62 extern char hostname[MAXHOSTNAMELEN];
63 extern int hostnamelen;
64 extern char domainname[MAXHOSTNAMELEN];
65 extern int domainnamelen;
66 extern char kernelname[MAXPATHLEN];
69 extern struct timeval boottime;
71 extern struct timezone tz; /* XXX */
73 extern int tick; /* usec per tick (1000000 / hz) */
74 extern int tickadj; /* "standard" clock skew, us./tick */
75 extern int hz; /* system clock's frequency */
76 extern int psratio; /* ratio: prof / stat */
77 extern int stathz; /* statistics clock's frequency */
78 extern int profhz; /* profiling clock's frequency */
80 extern int lbolt; /* once a second sleep address */
82 extern long timedelta;
87 * Enumerated types for known system startup interfaces.
89 * Startup occurs in ascending numeric order; the list entries are
90 * sorted prior to attempting startup to guarantee order. Items
91 * of the same level are arbitrated for order based on the 'order'
94 * These numbers are arbitrary and are chosen ONLY for ordering; the
95 * enumeration values are explicit rather than implicit to provide
96 * for binary compatibility with inserted elements.
98 * The SI_SUB_RUN_SCHEDULER value must have the highest lexical value.
100 * The SI_SUB_CONSOLE and SI_SUB_SWAP values represent values used by
101 * the BSD 4.4Lite but not by FreeBSD; they are maintained in dependent
102 * order to support porting.
104 * The SI_SUB_PROTO_BEGIN and SI_SUB_PROTO_END bracket a range of
105 * initializations to take place at splimp(). This is a historical
106 * wart that should be removed -- probably running everything at
107 * splimp() until the first init that doesn't want it is the correct
108 * fix. They are currently present to ensure historical behavior.
110 enum sysinit_sub_id {
111 SI_SUB_DUMMY = 0x0000000, /* not executed; for linker*/
112 SI_SUB_DONE = 0x0000001, /* processed*/
113 SI_SUB_TUNABLES = 0x0700000, /* establish tunable values */
114 SI_SUB_CONSOLE = 0x0800000, /* console*/
115 SI_SUB_COPYRIGHT = 0x0800001, /* first use of console*/
116 SI_SUB_VM = 0x1000000, /* virtual memory system init*/
117 SI_SUB_KMEM = 0x1800000, /* kernel memory*/
118 SI_SUB_KVM_RSRC = 0x1A00000, /* kvm operational limits*/
119 SI_SUB_WITNESS = 0x1A80000, /* witness initialization */
120 SI_SUB_LOCK = 0x1B00000, /* lockmgr locks */
121 SI_SUB_EVENTHANDLER = 0x1C00000, /* eventhandler init */
122 SI_SUB_CPU = 0x2000000, /* CPU resource(s)*/
123 SI_SUB_KLD = 0x2100000, /* KLD and module setup */
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_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_DRIVERS = 0x3100000, /* Let Drivers initialize */
133 SI_SUB_CONFIGURE = 0x3800000, /* Configure devices */
134 SI_SUB_VFS = 0x4000000, /* virtual file system*/
135 SI_SUB_CLOCKS = 0x4800000, /* real time and stat clocks*/
136 SI_SUB_CLIST = 0x5800000, /* clists*/
137 SI_SUB_SYSV_SHM = 0x6400000, /* System V shared memory*/
138 SI_SUB_SYSV_SEM = 0x6800000, /* System V semaphores*/
139 SI_SUB_SYSV_MSG = 0x6C00000, /* System V message queues*/
140 SI_SUB_P1003_1B = 0x6E00000, /* P1003.1B realtime */
141 SI_SUB_PSEUDO = 0x7000000, /* pseudo devices*/
142 SI_SUB_EXEC = 0x7400000, /* execve() handlers */
143 SI_SUB_PROTO_BEGIN = 0x8000000, /* XXX: set splimp (kludge)*/
144 SI_SUB_PROTO_IF = 0x8400000, /* interfaces*/
145 SI_SUB_PROTO_DOMAIN = 0x8800000, /* domains (address families?)*/
146 SI_SUB_PROTO_END = 0x8ffffff, /* XXX: set splx (kludge)*/
147 SI_SUB_KPROF = 0x9000000, /* kernel profiling*/
148 SI_SUB_KICK_SCHEDULER = 0xa000000, /* start the timeout events*/
149 SI_SUB_INT_CONFIG_HOOKS = 0xa800000, /* Interrupts enabled config */
150 SI_SUB_ROOT_CONF = 0xb000000, /* Find root devices */
151 SI_SUB_DUMP_CONF = 0xb200000, /* Find dump devices */
152 SI_SUB_VINUM = 0xb300000, /* Configure vinum */
153 SI_SUB_MOUNT_ROOT = 0xb400000, /* root mount*/
154 SI_SUB_SWAP = 0xc000000, /* swap*/
155 SI_SUB_INTRINSIC_POST = 0xd000000, /* proc 0 cleanup*/
156 SI_SUB_KTHREAD_INIT = 0xe000000, /* init process*/
157 SI_SUB_KTHREAD_PAGE = 0xe400000, /* pageout daemon*/
158 SI_SUB_KTHREAD_VM = 0xe800000, /* vm daemon*/
159 SI_SUB_KTHREAD_BUF = 0xea00000, /* buffer daemon*/
160 SI_SUB_KTHREAD_UPDATE = 0xec00000, /* update daemon*/
161 SI_SUB_KTHREAD_IDLE = 0xee00000, /* idle procs*/
162 SI_SUB_SMP = 0xf000000, /* start the APs*/
163 SI_SUB_RUN_SCHEDULER = 0xfffffff /* scheduler*/
168 * Some enumerated orders; "ANY" sorts last.
170 enum sysinit_elem_order {
171 SI_ORDER_FIRST = 0x0000000, /* first*/
172 SI_ORDER_SECOND = 0x0000001, /* second*/
173 SI_ORDER_THIRD = 0x0000002, /* third*/
174 SI_ORDER_MIDDLE = 0x1000000, /* somewhere in the middle */
175 SI_ORDER_ANY = 0xfffffff /* last*/
180 * A system initialization call instance
182 * At the moment there is one instance of sysinit. We probably do not
183 * want two which is why this code is if'd out, but we definitely want
184 * to discern SYSINIT's which take non-constant data pointers and
185 * SYSINIT's which take constant data pointers,
187 * The C_* macros take functions expecting const void * arguments
188 * while the non-C_* macros take functions expecting just void * arguments.
190 * With -Wcast-qual on, the compiler issues warnings:
191 * - if we pass non-const data or functions taking non-const data
194 * - if we pass const data to the normal macros
196 * However, no warning is issued if we pass a function taking const data
197 * through a normal non-const macro. This is ok because the function is
198 * saying it won't modify the data so we don't care whether the data is
202 typedef void (*sysinit_nfunc_t) __P((void *));
203 typedef void (*sysinit_cfunc_t) __P((const void *));
206 unsigned int subsystem; /* subsystem identifier*/
207 unsigned int order; /* init order within subsystem*/
208 sysinit_cfunc_t func; /* function */
209 const void *udata; /* multiplexer/argument */
213 * Default: no special processing
215 * The C_ version of SYSINIT is for data pointers to const
216 * data ( and functions taking data pointers to const data ).
217 * At the moment it is no different from SYSINIT and thus
218 * still results in warnings.
220 * The casts are necessary to have the compiler produce the
221 * correct warnings when -Wcast-qual is used.
224 #define C_SYSINIT(uniquifier, subsystem, order, func, ident) \
225 static struct sysinit uniquifier ## _sys_init = { \
231 DATA_SET(sysinit_set,uniquifier ## _sys_init);
233 #define SYSINIT(uniquifier, subsystem, order, func, ident) \
234 C_SYSINIT(uniquifier, subsystem, order, \
235 (sysinit_cfunc_t)(sysinit_nfunc_t)func, (void *)ident)
238 * Called on module unload: no special processing
240 #define C_SYSUNINIT(uniquifier, subsystem, order, func, ident) \
241 static struct sysinit uniquifier ## _sys_uninit = { \
247 DATA_SET(sysuninit_set,uniquifier ## _sys_uninit)
249 #define SYSUNINIT(uniquifier, subsystem, order, func, ident) \
250 C_SYSUNINIT(uniquifier, subsystem, order, \
251 (sysinit_cfunc_t)(sysinit_nfunc_t)func, (void *)ident)
253 void sysinit_add __P((struct sysinit **set));
256 * Infrastructure for tunable 'constants'. Value may be specified at compile
257 * time or kernel load time. Rules relating tunables together can be placed
258 * in a SYSINIT function at SI_SUB_TUNABLES with SI_ORDER_LAST.
261 #define TUNABLE_INT_DECL(path, defval, var) \
262 static void __Tunable_ ## var (void *ignored) \
264 TUNABLE_INT_FETCH((path), (defval), (var)) \
266 SYSINIT(__Tunable_init_ ## var, SI_SUB_TUNABLES, SI_ORDER_MIDDLE, __Tunable_ ## var , NULL);
268 #define TUNABLE_INT_FETCH(path, defval, var) \
269 if (!getenv_int((path), &(var))) \
272 #define TUNABLE_STR_DECL(path, defval, var, size) \
273 static void __Tunable_ ## var (void *ignored) \
275 TUNABLE_STR_FETCH((path), (defval), (var), (size)) \
277 SYSINIT(__Tunable_init_ ## var, SI_SUB_TUNABLES, SI_ORDER_MIDDLE, __Tunable_ ## var , NULL);
279 #define TUNABLE_STR_FETCH(path, defval, var, size) \
281 tmp = getenv((path)); \
284 strncpy((var), tmp, (size)); \
285 (var)[(size) - 1] = 0;
287 struct intr_config_hook {
288 TAILQ_ENTRY(intr_config_hook) ich_links;
289 void (*ich_func) __P((void *arg));
293 int config_intrhook_establish __P((struct intr_config_hook *hook));
294 void config_intrhook_disestablish __P((struct intr_config_hook *hook));
296 #endif /* !_SYS_KERNEL_H_*/