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 * $FreeBSD$
45 */
46
47 #include <sys/param.h>
48 #include <sys/kernel.h>
49 #include <sys/systm.h>
50
51 /*
52 * Autoconfiguration subroutines.
53 */
54
55 /*
56 * "Interrupt driven config" functions.
57 */
58 static TAILQ_HEAD(, intr_config_hook) intr_config_hook_list =
59 TAILQ_HEAD_INITIALIZER(intr_config_hook_list);
60
61
62 /* ARGSUSED */
63 static void run_interrupt_driven_config_hooks __P((void *dummy));
64 static void
65 run_interrupt_driven_config_hooks(dummy)
66 void *dummy;
67 {
68 struct intr_config_hook *hook_entry, *next_entry;
69
70 for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
71 hook_entry != NULL;
72 hook_entry = next_entry) {
73 next_entry = TAILQ_NEXT(hook_entry, ich_links);
74 (*hook_entry->ich_func)(hook_entry->ich_arg);
75 }
76
77 while (!TAILQ_EMPTY(&intr_config_hook_list)) {
78 tsleep(&intr_config_hook_list, PCONFIG, "conifhk", 0);
79 }
80 }
81 SYSINIT(intr_config_hooks, SI_SUB_INT_CONFIG_HOOKS, SI_ORDER_FIRST,
82 run_interrupt_driven_config_hooks, NULL)
83
84 /*
85 * Register a hook that will be called after "cold"
86 * autoconfiguration is complete and interrupts can
87 * be used to complete initialization.
88 */
89 int
90 config_intrhook_establish(hook)
91 struct intr_config_hook *hook;
92 {
93 struct intr_config_hook *hook_entry;
94
95 for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
96 hook_entry != NULL;
97 hook_entry = TAILQ_NEXT(hook_entry, ich_links))
98 if (hook_entry == hook)
99 break;
100 if (hook_entry != NULL) {
101 printf("config_intrhook_establish: establishing an "
102 "already established hook.\n");
103 return (1);
104 }
105 TAILQ_INSERT_TAIL(&intr_config_hook_list, hook, ich_links);
106 if (cold == 0)
107 /* XXX Sufficient for modules loaded after initial config??? */
108 run_interrupt_driven_config_hooks(NULL);
109 return (0);
110 }
111
112 void
113 config_intrhook_disestablish(hook)
114 struct intr_config_hook *hook;
115 {
116 struct intr_config_hook *hook_entry;
117
118 for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
119 hook_entry != NULL;
120 hook_entry = TAILQ_NEXT(hook_entry, ich_links))
121 if (hook_entry == hook)
122 break;
123 if (hook_entry == NULL)
124 panic("config_intrhook_disestablish: disestablishing an "
125 "unestablished hook");
126
127 TAILQ_REMOVE(&intr_config_hook_list, hook, ich_links);
128 /* Wakeup anyone watching the list */
129 wakeup(&intr_config_hook_list);
130 }
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