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: src/sys/kern/subr_autoconf.c,v 1.14 1999/10/05 21:19:41 n_hibma Exp $ 45 * $DragonFly: src/sys/kern/subr_autoconf.c,v 1.5 2004/05/26 20:04:07 dillon Exp $ 46 */ 47 48 #include <sys/param.h> 49 #include <sys/kernel.h> 50 #include <sys/systm.h> 51 52 /* 53 * Autoconfiguration subroutines. 54 */ 55 56 /* 57 * "Interrupt driven config" functions. 58 */ 59 static TAILQ_HEAD(, intr_config_hook) intr_config_hook_list = 60 TAILQ_HEAD_INITIALIZER(intr_config_hook_list); 61 62 63 /* ARGSUSED */ 64 static void run_interrupt_driven_config_hooks (void *dummy); 65 66 static void 67 run_interrupt_driven_config_hooks(void *dummy) 68 { 69 struct intr_config_hook *hook_entry, *next_entry; 70 71 for (hook_entry = TAILQ_FIRST(&intr_config_hook_list); 72 hook_entry != NULL; 73 hook_entry = next_entry) { 74 next_entry = TAILQ_NEXT(hook_entry, ich_links); 75 (*hook_entry->ich_func)(hook_entry->ich_arg); 76 } 77 78 while (!TAILQ_EMPTY(&intr_config_hook_list)) { 79 tsleep(&intr_config_hook_list, 0, "conifhk", 0); 80 } 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(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(struct intr_config_hook *hook) 114 { 115 struct intr_config_hook *hook_entry; 116 117 for (hook_entry = TAILQ_FIRST(&intr_config_hook_list); 118 hook_entry != NULL; 119 hook_entry = TAILQ_NEXT(hook_entry, ich_links)) 120 if (hook_entry == hook) 121 break; 122 if (hook_entry == NULL) 123 panic("config_intrhook_disestablish: disestablishing an " 124 "unestablished hook"); 125 126 TAILQ_REMOVE(&intr_config_hook_list, hook, ich_links); 127 /* Wakeup anyone watching the list */ 128 wakeup(&intr_config_hook_list); 129 } 130