1 /*-
2 * Copyright (c) 1992, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This software was developed by the Computer Systems Engineering group
6 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
7 * contributed to Berkeley.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)subr_autoconf.c 8.1 (Berkeley) 6/10/93
34 *
35 */
36
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD: releng/6.0/sys/kern/subr_autoconf.c 139804 2005-01-06 23:35:40Z imp $");
39
40 #include <sys/param.h>
41 #include <sys/kernel.h>
42 #include <sys/systm.h>
43
44 /*
45 * Autoconfiguration subroutines.
46 */
47
48 /*
49 * "Interrupt driven config" functions.
50 */
51 static TAILQ_HEAD(, intr_config_hook) intr_config_hook_list =
52 TAILQ_HEAD_INITIALIZER(intr_config_hook_list);
53
54
55 /* ARGSUSED */
56 static void run_interrupt_driven_config_hooks(void *dummy);
57 static void
58 run_interrupt_driven_config_hooks(dummy)
59 void *dummy;
60 {
61 struct intr_config_hook *hook_entry, *next_entry;
62
63 for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
64 hook_entry != NULL;
65 hook_entry = next_entry) {
66 next_entry = TAILQ_NEXT(hook_entry, ich_links);
67 (*hook_entry->ich_func)(hook_entry->ich_arg);
68 }
69
70 while (!TAILQ_EMPTY(&intr_config_hook_list)) {
71 tsleep(&intr_config_hook_list, PCONFIG, "conifhk", 0);
72 }
73 }
74 SYSINIT(intr_config_hooks, SI_SUB_INT_CONFIG_HOOKS, SI_ORDER_FIRST,
75 run_interrupt_driven_config_hooks, NULL)
76
77 /*
78 * Register a hook that will be called after "cold"
79 * autoconfiguration is complete and interrupts can
80 * be used to complete initialization.
81 */
82 int
83 config_intrhook_establish(hook)
84 struct intr_config_hook *hook;
85 {
86 struct intr_config_hook *hook_entry;
87
88 for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
89 hook_entry != NULL;
90 hook_entry = TAILQ_NEXT(hook_entry, ich_links))
91 if (hook_entry == hook)
92 break;
93 if (hook_entry != NULL) {
94 printf("config_intrhook_establish: establishing an "
95 "already established hook.\n");
96 return (1);
97 }
98 TAILQ_INSERT_TAIL(&intr_config_hook_list, hook, ich_links);
99 if (cold == 0)
100 /* XXX Sufficient for modules loaded after initial config??? */
101 run_interrupt_driven_config_hooks(NULL);
102 return (0);
103 }
104
105 void
106 config_intrhook_disestablish(hook)
107 struct intr_config_hook *hook;
108 {
109 struct intr_config_hook *hook_entry;
110
111 for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
112 hook_entry != NULL;
113 hook_entry = TAILQ_NEXT(hook_entry, ich_links))
114 if (hook_entry == hook)
115 break;
116 if (hook_entry == NULL)
117 panic("config_intrhook_disestablish: disestablishing an "
118 "unestablished hook");
119
120 TAILQ_REMOVE(&intr_config_hook_list, hook, ich_links);
121 /* Wakeup anyone watching the list */
122 wakeup(&intr_config_hook_list);
123 }
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