2 * Copyright (c) 1992, 1993
3 * The Regents of the University of California. All rights reserved.
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.
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.
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
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. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * @(#)subr_autoconf.c 8.1 (Berkeley) 6/10/93
40 * $FreeBSD: src/sys/kern/subr_autoconf.c,v 1.14 1999/10/05 21:19:41 n_hibma Exp $
43 #include <sys/param.h>
44 #include <sys/kernel.h>
45 #include <sys/systm.h>
46 #include <sys/thread.h>
47 #include <sys/thread2.h>
50 * Autoconfiguration subroutines.
54 * "Interrupt driven config" functions.
56 static TAILQ_HEAD(, intr_config_hook) intr_config_hook_list =
57 TAILQ_HEAD_INITIALIZER(intr_config_hook_list);
61 static void run_interrupt_driven_config_hooks (void *dummy);
62 static int ran_config_hooks;
65 run_interrupt_driven_config_hooks(void *dummy)
67 struct intr_config_hook *hook_entry;
69 #ifndef _KERNEL_VIRTUAL
70 int save_ticks = ticks;
75 while (!TAILQ_EMPTY(&intr_config_hook_list)) {
76 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links) {
77 if (hook_entry->ich_ran == 0) {
78 hook_entry->ich_ran = 1;
79 (*hook_entry->ich_func)(hook_entry->ich_arg);
85 if (TAILQ_EMPTY(&intr_config_hook_list))
88 if (waiting >= 20 && (waiting % 10) == 0) {
90 kprintf("**WARNING** waiting for the following device "
91 "to finish configuring:\n");
92 TAILQ_FOREACH(hook_entry, &intr_config_hook_list,
94 kprintf(" %s:\tfunc=%p arg=%p\n",
95 (hook_entry->ich_desc ?
96 hook_entry->ich_desc : "?"),
102 kprintf("Giving up, interrupt routing is "
107 tsleep(&intr_config_hook_list, 0, "conifhk", hz);
112 * Terrible hack to give U4B (usb) a chance to configure, else
113 * the root mount might not see a valid usb device. This can happen
114 * because the AHCI devices might have already finished probing
115 * before the usb ports are even registered.
117 #ifndef _KERNEL_VIRTUAL
118 while (ticks - save_ticks < 5*hz)
119 tsleep(&intr_config_hook_list, 0, "delay", hz / 10);
123 SYSINIT(intr_config_hooks, SI_SUB_INT_CONFIG_HOOKS, SI_ORDER_FIRST,
124 run_interrupt_driven_config_hooks, NULL);
127 * Register a hook that will be called after "cold"
128 * autoconfiguration is complete and interrupts can
129 * be used to complete initialization.
132 config_intrhook_establish(struct intr_config_hook *hook)
134 struct intr_config_hook *hook_entry;
136 for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
138 hook_entry = TAILQ_NEXT(hook_entry, ich_links)) {
139 if (hook_entry == hook)
141 if (hook_entry->ich_order > hook->ich_order)
144 if (hook_entry == hook) {
145 kprintf("config_intrhook_establish: establishing an "
146 "already established hook.\n");
151 TAILQ_INSERT_BEFORE(hook_entry, hook, ich_links);
153 TAILQ_INSERT_TAIL(&intr_config_hook_list, hook, ich_links);
156 * Late hook, run immediately.
158 if (ran_config_hooks)
159 run_interrupt_driven_config_hooks(NULL);
164 config_intrhook_disestablish(struct intr_config_hook *hook)
166 struct intr_config_hook *hook_entry;
168 for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
170 hook_entry = TAILQ_NEXT(hook_entry, ich_links))
171 if (hook_entry == hook)
173 if (hook_entry == NULL)
174 panic("config_intrhook_disestablish: disestablishing an "
175 "unestablished hook");
177 TAILQ_REMOVE(&intr_config_hook_list, hook, ich_links);
178 /* Wakeup anyone watching the list */
179 wakeup(&intr_config_hook_list);