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/systm.h> 43 44 /* 45 * Autoconfiguration subroutines. 46 */ 47 48 /* 49 * "Interrupt driven config" functions. 50 */ 51 static TAILQ_HEAD(, intr_config_hook) intr_config_hook_list = 52 TAILQ_HEAD_INITIALIZER(intr_config_hook_list); 53 54 55 /* ARGSUSED */ 56 static void run_interrupt_driven_config_hooks(void *dummy); 57 static void 58 run_interrupt_driven_config_hooks(dummy) 59 void *dummy; 60 { 61 struct intr_config_hook *hook_entry, *next_entry; 62 63 for (hook_entry = TAILQ_FIRST(&intr_config_hook_list); 64 hook_entry != NULL; 65 hook_entry = next_entry) { 66 next_entry = TAILQ_NEXT(hook_entry, ich_links); 67 (*hook_entry->ich_func)(hook_entry->ich_arg); 68 } 69 70 while (!TAILQ_EMPTY(&intr_config_hook_list)) { 71 tsleep(&intr_config_hook_list, PCONFIG, "conifhk", 0); 72 } 73 } 74 SYSINIT(intr_config_hooks, SI_SUB_INT_CONFIG_HOOKS, SI_ORDER_FIRST, 75 run_interrupt_driven_config_hooks, NULL) 76 77 /* 78 * Register a hook that will be called after "cold" 79 * autoconfiguration is complete and interrupts can 80 * be used to complete initialization. 81 */ 82 int 83 config_intrhook_establish(hook) 84 struct intr_config_hook *hook; 85 { 86 struct intr_config_hook *hook_entry; 87 88 for (hook_entry = TAILQ_FIRST(&intr_config_hook_list); 89 hook_entry != NULL; 90 hook_entry = TAILQ_NEXT(hook_entry, ich_links)) 91 if (hook_entry == hook) 92 break; 93 if (hook_entry != NULL) { 94 printf("config_intrhook_establish: establishing an " 95 "already established hook.\n"); 96 return (1); 97 } 98 TAILQ_INSERT_TAIL(&intr_config_hook_list, hook, ich_links); 99 if (cold == 0) 100 /* XXX Sufficient for modules loaded after initial config??? */ 101 run_interrupt_driven_config_hooks(NULL); 102 return (0); 103 } 104 105 void 106 config_intrhook_disestablish(hook) 107 struct intr_config_hook *hook; 108 { 109 struct intr_config_hook *hook_entry; 110 111 for (hook_entry = TAILQ_FIRST(&intr_config_hook_list); 112 hook_entry != NULL; 113 hook_entry = TAILQ_NEXT(hook_entry, ich_links)) 114 if (hook_entry == hook) 115 break; 116 if (hook_entry == NULL) 117 panic("config_intrhook_disestablish: disestablishing an " 118 "unestablished hook"); 119 120 TAILQ_REMOVE(&intr_config_hook_list, hook, ich_links); 121 /* Wakeup anyone watching the list */ 122 wakeup(&intr_config_hook_list); 123 } 124