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  * 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(, 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 }

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