diff options
Diffstat (limited to 'sys/kern/subr_autoconf.c')
| -rw-r--r-- | sys/kern/subr_autoconf.c | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/sys/kern/subr_autoconf.c b/sys/kern/subr_autoconf.c new file mode 100644 index 0000000..5132e02 --- /dev/null +++ b/sys/kern/subr_autoconf.c @@ -0,0 +1,130 @@ +/* + * Copyright (c) 1992, 1993 + * The Regents of the University of California. All rights reserved. + * + * This software was developed by the Computer Systems Engineering group + * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and + * contributed to Berkeley. + * + * All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Lawrence Berkeley Laboratories. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)subr_autoconf.c 8.1 (Berkeley) 6/10/93 + * + * $FreeBSD$ + */ + +#include <sys/param.h> +#include <sys/kernel.h> +#include <sys/systm.h> + +/* + * Autoconfiguration subroutines. + */ + +/* + * "Interrupt driven config" functions. + */ +static TAILQ_HEAD(, intr_config_hook) intr_config_hook_list = + TAILQ_HEAD_INITIALIZER(intr_config_hook_list); + + +/* ARGSUSED */ +static void run_interrupt_driven_config_hooks(void *dummy); +static void +run_interrupt_driven_config_hooks(dummy) + void *dummy; +{ + struct intr_config_hook *hook_entry, *next_entry; + + for (hook_entry = TAILQ_FIRST(&intr_config_hook_list); + hook_entry != NULL; + hook_entry = next_entry) { + next_entry = TAILQ_NEXT(hook_entry, ich_links); + (*hook_entry->ich_func)(hook_entry->ich_arg); + } + + while (!TAILQ_EMPTY(&intr_config_hook_list)) { + tsleep(&intr_config_hook_list, PCONFIG, "conifhk", 0); + } +} +SYSINIT(intr_config_hooks, SI_SUB_INT_CONFIG_HOOKS, SI_ORDER_FIRST, + run_interrupt_driven_config_hooks, NULL) + +/* + * Register a hook that will be called after "cold" + * autoconfiguration is complete and interrupts can + * be used to complete initialization. + */ +int +config_intrhook_establish(hook) + struct intr_config_hook *hook; +{ + struct intr_config_hook *hook_entry; + + for (hook_entry = TAILQ_FIRST(&intr_config_hook_list); + hook_entry != NULL; + hook_entry = TAILQ_NEXT(hook_entry, ich_links)) + if (hook_entry == hook) + break; + if (hook_entry != NULL) { + printf("config_intrhook_establish: establishing an " + "already established hook.\n"); + return (1); + } + TAILQ_INSERT_TAIL(&intr_config_hook_list, hook, ich_links); + if (cold == 0) + /* XXX Sufficient for modules loaded after initial config??? */ + run_interrupt_driven_config_hooks(NULL); + return (0); +} + +void +config_intrhook_disestablish(hook) + struct intr_config_hook *hook; +{ + struct intr_config_hook *hook_entry; + + for (hook_entry = TAILQ_FIRST(&intr_config_hook_list); + hook_entry != NULL; + hook_entry = TAILQ_NEXT(hook_entry, ich_links)) + if (hook_entry == hook) + break; + if (hook_entry == NULL) + panic("config_intrhook_disestablish: disestablishing an " + "unestablished hook"); + + TAILQ_REMOVE(&intr_config_hook_list, hook, ich_links); + /* Wakeup anyone watching the list */ + wakeup(&intr_config_hook_list); +} |
