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 * All advertising materials mentioning features or use of this software
10 * must display the following acknowledgement:
11 * This product includes software developed by the University of
12 * California, Lawrence Berkeley Laboratories.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
16 * are met:
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
22 * 3. All advertising materials mentioning features or use of this software
23 * must display the following acknowledgement:
24 * This product includes software developed by the University of
25 * California, Berkeley and its contributors.
26 * 4. Neither the name of the University nor the names of its contributors
27 * may be used to endorse or promote products derived from this software
28 * without specific prior written permission.
29 *
30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
33 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 * SUCH DAMAGE.
41 *
42 * @(#)subr_autoconf.c 8.1 (Berkeley) 6/10/93
43 *
44 */
45
46 #include <sys/cdefs.h>
47 __FBSDID("$FreeBSD: releng/5.2/sys/kern/subr_autoconf.c 117879 2003-07-22 10:36:36Z phk $");
48
49 #include <sys/param.h>
50 #include <sys/kernel.h>
51 #include <sys/systm.h>
52
53 /*
54 * Autoconfiguration subroutines.
55 */
56
57 /*
58 * "Interrupt driven config" functions.
59 */
60 static TAILQ_HEAD(, intr_config_hook) intr_config_hook_list =
61 TAILQ_HEAD_INITIALIZER(intr_config_hook_list);
62
63
64 /* ARGSUSED */
65 static void run_interrupt_driven_config_hooks(void *dummy);
66 static void
67 run_interrupt_driven_config_hooks(dummy)
68 void *dummy;
69 {
70 struct intr_config_hook *hook_entry, *next_entry;
71
72 for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
73 hook_entry != NULL;
74 hook_entry = next_entry) {
75 next_entry = TAILQ_NEXT(hook_entry, ich_links);
76 (*hook_entry->ich_func)(hook_entry->ich_arg);
77 }
78
79 while (!TAILQ_EMPTY(&intr_config_hook_list)) {
80 tsleep(&intr_config_hook_list, PCONFIG, "conifhk", 0);
81 }
82 }
83 SYSINIT(intr_config_hooks, SI_SUB_INT_CONFIG_HOOKS, SI_ORDER_FIRST,
84 run_interrupt_driven_config_hooks, NULL)
85
86 /*
87 * Register a hook that will be called after "cold"
88 * autoconfiguration is complete and interrupts can
89 * be used to complete initialization.
90 */
91 int
92 config_intrhook_establish(hook)
93 struct intr_config_hook *hook;
94 {
95 struct intr_config_hook *hook_entry;
96
97 for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
98 hook_entry != NULL;
99 hook_entry = TAILQ_NEXT(hook_entry, ich_links))
100 if (hook_entry == hook)
101 break;
102 if (hook_entry != NULL) {
103 printf("config_intrhook_establish: establishing an "
104 "already established hook.\n");
105 return (1);
106 }
107 TAILQ_INSERT_TAIL(&intr_config_hook_list, hook, ich_links);
108 if (cold == 0)
109 /* XXX Sufficient for modules loaded after initial config??? */
110 run_interrupt_driven_config_hooks(NULL);
111 return (0);
112 }
113
114 void
115 config_intrhook_disestablish(hook)
116 struct intr_config_hook *hook;
117 {
118 struct intr_config_hook *hook_entry;
119
120 for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
121 hook_entry != NULL;
122 hook_entry = TAILQ_NEXT(hook_entry, ich_links))
123 if (hook_entry == hook)
124 break;
125 if (hook_entry == NULL)
126 panic("config_intrhook_disestablish: disestablishing an "
127 "unestablished hook");
128
129 TAILQ_REMOVE(&intr_config_hook_list, hook, ich_links);
130 /* Wakeup anyone watching the list */
131 wakeup(&intr_config_hook_list);
132 }
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