The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_autoconf.c

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    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/lock.h>
   43 #include <sys/mutex.h>
   44 #include <sys/systm.h>
   45 
   46 /*
   47  * Autoconfiguration subroutines.
   48  */
   49 
   50 /*
   51  * "Interrupt driven config" functions.
   52  */
   53 static TAILQ_HEAD(, intr_config_hook) intr_config_hook_list =
   54         TAILQ_HEAD_INITIALIZER(intr_config_hook_list);
   55 static struct mtx intr_config_hook_lock;
   56 MTX_SYSINIT(intr_config_hook, &intr_config_hook_lock, "intr config", MTX_DEF);
   57 
   58 /* ARGSUSED */
   59 static void run_interrupt_driven_config_hooks(void *dummy);
   60 
   61 static void
   62 run_interrupt_driven_config_hooks(dummy)
   63         void *dummy;
   64 {
   65         struct intr_config_hook *hook_entry, *next_entry;
   66 
   67         mtx_lock(&intr_config_hook_lock);
   68         TAILQ_FOREACH_SAFE(hook_entry, &intr_config_hook_list, ich_links,
   69             next_entry) {
   70                 next_entry = TAILQ_NEXT(hook_entry, ich_links);
   71                 mtx_unlock(&intr_config_hook_lock);
   72                 (*hook_entry->ich_func)(hook_entry->ich_arg);
   73                 mtx_lock(&intr_config_hook_lock);
   74         }
   75 
   76         while (!TAILQ_EMPTY(&intr_config_hook_list)) {
   77                 msleep(&intr_config_hook_list, &intr_config_hook_lock, PCONFIG,
   78                     "conifhk", 0);
   79         }
   80         mtx_unlock(&intr_config_hook_lock);
   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         mtx_lock(&intr_config_hook_lock);
   97         TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links)
   98                 if (hook_entry == hook)
   99                         break;
  100         if (hook_entry != NULL) {
  101                 mtx_unlock(&intr_config_hook_lock);
  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         mtx_unlock(&intr_config_hook_lock);
  108         if (cold == 0)
  109                 /* XXX Sufficient for modules loaded after initial config??? */
  110                 run_interrupt_driven_config_hooks(NULL);        
  111         return (0);
  112 }
  113 
  114 void
  115 config_intrhook_disestablish(hook)
  116         struct intr_config_hook *hook;
  117 {
  118         struct intr_config_hook *hook_entry;
  119 
  120         mtx_lock(&intr_config_hook_lock);
  121         TAILQ_FOREACH(hook_entry, &intr_config_hook_list, 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 
  130         /* Wakeup anyone watching the list */
  131         wakeup(&intr_config_hook_list);
  132         mtx_unlock(&intr_config_hook_lock);
  133 }

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