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