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 mtx_unlock(&intr_config_hook_lock); 71 (*hook_entry->ich_func)(hook_entry->ich_arg); 72 mtx_lock(&intr_config_hook_lock); 73 } 74 75 while (!TAILQ_EMPTY(&intr_config_hook_list)) { 76 msleep(&intr_config_hook_list, &intr_config_hook_lock, PCONFIG, 77 "conifhk", 0); 78 } 79 mtx_unlock(&intr_config_hook_lock); 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 mtx_lock(&intr_config_hook_lock); 96 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links) 97 if (hook_entry == hook) 98 break; 99 if (hook_entry != NULL) { 100 mtx_unlock(&intr_config_hook_lock); 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 mtx_unlock(&intr_config_hook_lock); 107 if (cold == 0) 108 /* XXX Sufficient for modules loaded after initial config??? */ 109 run_interrupt_driven_config_hooks(NULL); 110 return (0); 111 } 112 113 void 114 config_intrhook_disestablish(hook) 115 struct intr_config_hook *hook; 116 { 117 struct intr_config_hook *hook_entry; 118 119 mtx_lock(&intr_config_hook_lock); 120 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, 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); 128 129 /* Wakeup anyone watching the list */ 130 wakeup(&intr_config_hook_list); 131 mtx_unlock(&intr_config_hook_lock); 132 } 133