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("$FreeBSD$");
39
40 #include <sys/param.h>
41 #include <sys/kernel.h>
42 #include <sys/lock.h>
43 #include <sys/mutex.h>
44 #include <sys/systm.h>
45
46 /*
47 * Autoconfiguration subroutines.
48 */
49
50 /*
51 * "Interrupt driven config" functions.
52 */
53 static TAILQ_HEAD(, intr_config_hook) intr_config_hook_list =
54 TAILQ_HEAD_INITIALIZER(intr_config_hook_list);
55 static struct mtx intr_config_hook_lock;
56 MTX_SYSINIT(intr_config_hook, &intr_config_hook_lock, "intr config", MTX_DEF);
57
58 /* ARGSUSED */
59 static void run_interrupt_driven_config_hooks(void *dummy);
60
61 static void
62 run_interrupt_driven_config_hooks(dummy)
63 void *dummy;
64 {
65 struct intr_config_hook *hook_entry, *next_entry;
66
67 mtx_lock(&intr_config_hook_lock);
68 TAILQ_FOREACH_SAFE(hook_entry, &intr_config_hook_list, ich_links,
69 next_entry) {
70 next_entry = TAILQ_NEXT(hook_entry, ich_links);
71 mtx_unlock(&intr_config_hook_lock);
72 (*hook_entry->ich_func)(hook_entry->ich_arg);
73 mtx_lock(&intr_config_hook_lock);
74 }
75
76 while (!TAILQ_EMPTY(&intr_config_hook_list)) {
77 msleep(&intr_config_hook_list, &intr_config_hook_lock, PCONFIG,
78 "conifhk", 0);
79 }
80 mtx_unlock(&intr_config_hook_lock);
81 }
82 SYSINIT(intr_config_hooks, SI_SUB_INT_CONFIG_HOOKS, SI_ORDER_FIRST,
83 run_interrupt_driven_config_hooks, NULL)
84
85 /*
86 * Register a hook that will be called after "cold"
87 * autoconfiguration is complete and interrupts can
88 * be used to complete initialization.
89 */
90 int
91 config_intrhook_establish(hook)
92 struct intr_config_hook *hook;
93 {
94 struct intr_config_hook *hook_entry;
95
96 mtx_lock(&intr_config_hook_lock);
97 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links)
98 if (hook_entry == hook)
99 break;
100 if (hook_entry != NULL) {
101 mtx_unlock(&intr_config_hook_lock);
102 printf("config_intrhook_establish: establishing an "
103 "already established hook.\n");
104 return (1);
105 }
106 TAILQ_INSERT_TAIL(&intr_config_hook_list, hook, ich_links);
107 mtx_unlock(&intr_config_hook_lock);
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 mtx_lock(&intr_config_hook_lock);
121 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links)
122 if (hook_entry == hook)
123 break;
124 if (hook_entry == NULL)
125 panic("config_intrhook_disestablish: disestablishing an "
126 "unestablished hook");
127
128 TAILQ_REMOVE(&intr_config_hook_list, hook, ich_links);
129
130 /* Wakeup anyone watching the list */
131 wakeup(&intr_config_hook_list);
132 mtx_unlock(&intr_config_hook_lock);
133 }
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