sys/kern/subr_autoconf.c

   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 }