subr_autoconf.c revision 117878
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 */ 45 46#include <sys/cdefs.h> 47__FBSDID("$FreeBSD: head/sys/kern/subr_autoconf.c 117878 2003-07-22 10:24:41Z phk $"); 48 49#include <sys/param.h> 50#include <sys/kernel.h> 51#include <sys/systm.h> 52 53/* 54 * Autoconfiguration subroutines. 55 */ 56 57/* 58 * "Interrupt driven config" functions. 59 */ 60static TAILQ_HEAD(, intr_config_hook) intr_config_hook_list = 61 TAILQ_HEAD_INITIALIZER(intr_config_hook_list); 62 63 64/* ARGSUSED */ 65static void run_interrupt_driven_config_hooks(void *dummy); 66static void 67run_interrupt_driven_config_hooks(dummy) 68 void *dummy; 69{ 70 struct intr_config_hook *hook_entry, *next_entry; 71 72 for (hook_entry = TAILQ_FIRST(&intr_config_hook_list); 73 hook_entry != NULL; 74 hook_entry = next_entry) { 75 next_entry = TAILQ_NEXT(hook_entry, ich_links); 76 printf("IDCH: %p(%p)\n", 77 hook_entry->ich_func, 78 hook_entry->ich_arg); 79 (*hook_entry->ich_func)(hook_entry->ich_arg); 80 } 81 82 while (!TAILQ_EMPTY(&intr_config_hook_list)) { 83 tsleep(&intr_config_hook_list, PCONFIG, "conifhk", 0); 84 } 85} 86SYSINIT(intr_config_hooks, SI_SUB_INT_CONFIG_HOOKS, SI_ORDER_FIRST, 87 run_interrupt_driven_config_hooks, NULL) 88 89/* 90 * Register a hook that will be called after "cold" 91 * autoconfiguration is complete and interrupts can 92 * be used to complete initialization. 93 */ 94int 95config_intrhook_establish(hook) 96 struct intr_config_hook *hook; 97{ 98 struct intr_config_hook *hook_entry; 99 100 for (hook_entry = TAILQ_FIRST(&intr_config_hook_list); 101 hook_entry != NULL; 102 hook_entry = TAILQ_NEXT(hook_entry, ich_links)) 103 if (hook_entry == hook) 104 break; 105 if (hook_entry != NULL) { 106 printf("config_intrhook_establish: establishing an " 107 "already established hook.\n"); 108 return (1); 109 } 110 TAILQ_INSERT_TAIL(&intr_config_hook_list, hook, ich_links); 111 if (cold == 0) 112 /* XXX Sufficient for modules loaded after initial config??? */ 113 run_interrupt_driven_config_hooks(NULL); 114 return (0); 115} 116 117void 118config_intrhook_disestablish(hook) 119 struct intr_config_hook *hook; 120{ 121 struct intr_config_hook *hook_entry; 122 123 for (hook_entry = TAILQ_FIRST(&intr_config_hook_list); 124 hook_entry != NULL; 125 hook_entry = TAILQ_NEXT(hook_entry, ich_links)) 126 if (hook_entry == hook) 127 break; 128 if (hook_entry == NULL) 129 panic("config_intrhook_disestablish: disestablishing an " 130 "unestablished hook"); 131 132 TAILQ_REMOVE(&intr_config_hook_list, hook, ich_links); 133 /* Wakeup anyone watching the list */ 134 wakeup(&intr_config_hook_list); 135} 136