subr_autoconf.c revision 45741
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 * $Id: subr_autoconf.c,v 1.9 1999/04/17 08:36:04 peter Exp $ 45 */ 46 47#include <sys/param.h> 48#include <sys/kernel.h> 49#include <sys/systm.h> 50#include <sys/device.h> 51 52/* 53 * Autoconfiguration subroutines. 54 */ 55 56/* 57 * "Interrupt driven config" functions. 58 */ 59static TAILQ_HEAD(, intr_config_hook) intr_config_hook_list = 60 TAILQ_HEAD_INITIALIZER(intr_config_hook_list); 61 62 63/* ARGSUSED */ 64static void run_interrupt_driven_config_hooks __P((void *dummy)); 65static void 66run_interrupt_driven_config_hooks(dummy) 67 void *dummy; 68{ 69 struct intr_config_hook *hook; 70 71 for (hook = intr_config_hook_list.tqh_first; hook != NULL; 72 hook = hook->ich_links.tqe_next) { 73 (*hook->ich_func)(hook->ich_arg); 74 } 75 76 while (intr_config_hook_list.tqh_first != NULL) { 77 tsleep(&intr_config_hook_list, PCONFIG, "conifhk", 0); 78 } 79} 80SYSINIT(intr_config_hooks, SI_SUB_INT_CONFIG_HOOKS, SI_ORDER_FIRST, 81 run_interrupt_driven_config_hooks, NULL) 82 83/* 84 * Register a hook that will be called after "cold" 85 * autoconfiguration is complete and interrupts can 86 * be used to complete initialization. 87 */ 88int 89config_intrhook_establish(hook) 90 struct intr_config_hook *hook; 91{ 92 struct intr_config_hook *hook_entry; 93 94 for (hook_entry = intr_config_hook_list.tqh_first; hook_entry != NULL; 95 hook_entry = hook_entry->ich_links.tqe_next) 96 if (hook_entry == hook) 97 break; 98 if (hook_entry != NULL) { 99 printf("config_intrhook_establish: establishing an " 100 "already established hook.\n"); 101 return (1); 102 } 103 TAILQ_INSERT_TAIL(&intr_config_hook_list, hook, ich_links); 104 if (cold == 0) 105 /* XXX Sufficient for modules loaded after initial config??? */ 106 run_interrupt_driven_config_hooks(NULL); 107 return (0); 108} 109 110void 111config_intrhook_disestablish(hook) 112 struct intr_config_hook *hook; 113{ 114 struct intr_config_hook *hook_entry; 115 116 for (hook_entry = intr_config_hook_list.tqh_first; hook_entry != NULL; 117 hook_entry = hook_entry->ich_links.tqe_next) 118 if (hook_entry == hook) 119 break; 120 if (hook_entry == NULL) 121 panic("config_intrhook_disestablish: disestablishing an " 122 "unestablished hook"); 123 124 TAILQ_REMOVE(&intr_config_hook_list, hook, ich_links); 125 /* Wakeup anyone watching the list */ 126 wakeup(&intr_config_hook_list); 127} 128