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: src/sys/kern/subr_autoconf.c,v 1.14 1999/10/05 21:19:41 n_hibma Exp $
  45  * $DragonFly: src/sys/kern/subr_autoconf.c,v 1.4 2003/08/26 21:09:02 rob Exp $
  46  */
  47
  48 #include <sys/param.h>
  49 #include <sys/kernel.h>
  50 #include <sys/systm.h>
  51
  52 /*
  53  * Autoconfiguration subroutines.
  54  */
  55
  56 /*
  57  * "Interrupt driven config" functions.
  58  */
  59 static TAILQ_HEAD(, intr_config_hook) intr_config_hook_list =
  60         TAILQ_HEAD_INITIALIZER(intr_config_hook_list);
  61
  62
  63 /* ARGSUSED */
  64 static void run_interrupt_driven_config_hooks (void *dummy);
  65 static void
  66 run_interrupt_driven_config_hooks(dummy)
  67         void *dummy;
  68 {
  69         struct intr_config_hook *hook_entry, *next_entry;
  70
  71         for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
  72              hook_entry != NULL;
  73              hook_entry = next_entry) {
  74                 next_entry = TAILQ_NEXT(hook_entry, ich_links);
  75                 (*hook_entry->ich_func)(hook_entry->ich_arg);
  76         }
  77
  78         while (!TAILQ_EMPTY(&intr_config_hook_list)) {
  79                 tsleep(&intr_config_hook_list, 0, "conifhk", 0);
  80         }
  81 }
  82 SYSINIT(intr_config_hooks, SI_SUB_INT_CONFIG_HOOKS, SI_ORDER_FIRST,
  83         run_interrupt_driven_config_hooks, NULL)
  84
  85 /*
  86  * Register a hook that will be called after "cold"
  87  * autoconfiguration is complete and interrupts can
  88  * be used to complete initialization.
  89  */
  90 int
  91 config_intrhook_establish(hook)
  92         struct intr_config_hook *hook;
  93 {
  94         struct intr_config_hook *hook_entry;
  95
  96         for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
  97              hook_entry != NULL;
  98              hook_entry = TAILQ_NEXT(hook_entry, ich_links))
  99                 if (hook_entry == hook)
 100                         break;
 101         if (hook_entry != NULL) {
 102                 printf("config_intrhook_establish: establishing an "
 103                        "already established hook.\n");
 104                 return (1);
 105         }
 106         TAILQ_INSERT_TAIL(&intr_config_hook_list, hook, ich_links);
 107         if (cold == 0)
 108                 /* XXX Sufficient for modules loaded after initial config??? */
 109                 run_interrupt_driven_config_hooks(NULL);
 110         return (0);
 111 }
 112
 113 void
 114 config_intrhook_disestablish(hook)
 115         struct intr_config_hook *hook;
 116 {
 117         struct intr_config_hook *hook_entry;
 118
 119         for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
 120              hook_entry != NULL;
 121              hook_entry = TAILQ_NEXT(hook_entry, ich_links))
 122                 if (hook_entry == hook)
 123                         break;
 124         if (hook_entry == NULL)
 125                 panic("config_intrhook_disestablish: disestablishing an "
 126                       "unestablished hook");
 127
 128         TAILQ_REMOVE(&intr_config_hook_list, hook, ich_links);
 129         /* Wakeup anyone watching the list */
 130         wakeup(&intr_config_hook_list);
 131 }