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

     /*
      * Copyright (c) 1992, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * This software was developed by the Computer Systems Engineering group
      * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
      * contributed to Berkeley.
      *
      * All advertising materials mentioning features or use of this software
     * must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Lawrence Berkeley Laboratories.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)subr_autoconf.c     8.1 (Berkeley) 6/10/93
     *
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/5.2/sys/kern/subr_autoconf.c 117879 2003-07-22 10:36:36Z phk $");
    
    #include <sys/param.h>
    #include <sys/kernel.h>
    #include <sys/systm.h>
    
    /*
     * Autoconfiguration subroutines.
     */
    
    /*
     * "Interrupt driven config" functions.
     */
    static TAILQ_HEAD(, intr_config_hook) intr_config_hook_list =
            TAILQ_HEAD_INITIALIZER(intr_config_hook_list);
    
    
    /* ARGSUSED */
    static void run_interrupt_driven_config_hooks(void *dummy);
    static void
    run_interrupt_driven_config_hooks(dummy)
            void *dummy;
    {
            struct intr_config_hook *hook_entry, *next_entry;
    
            for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
                 hook_entry != NULL;
                 hook_entry = next_entry) {
                    next_entry = TAILQ_NEXT(hook_entry, ich_links);
                    (*hook_entry->ich_func)(hook_entry->ich_arg);
            }
    
            while (!TAILQ_EMPTY(&intr_config_hook_list)) {
                    tsleep(&intr_config_hook_list, PCONFIG, "conifhk", 0);
            }
    }
    SYSINIT(intr_config_hooks, SI_SUB_INT_CONFIG_HOOKS, SI_ORDER_FIRST,
            run_interrupt_driven_config_hooks, NULL)
    
    /*
     * Register a hook that will be called after "cold"
     * autoconfiguration is complete and interrupts can
     * be used to complete initialization.
     */
    int
    config_intrhook_establish(hook)
            struct intr_config_hook *hook;
    {
            struct intr_config_hook *hook_entry;
    
            for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
                 hook_entry != NULL;
                 hook_entry = TAILQ_NEXT(hook_entry, ich_links))
                   if (hook_entry == hook)
                           break;
           if (hook_entry != NULL) {
                   printf("config_intrhook_establish: establishing an "
                          "already established hook.\n");
                   return (1);
           }
           TAILQ_INSERT_TAIL(&intr_config_hook_list, hook, ich_links);
           if (cold == 0)
                   /* XXX Sufficient for modules loaded after initial config??? */
                   run_interrupt_driven_config_hooks(NULL);        
           return (0);
   }
   
   void
   config_intrhook_disestablish(hook)
           struct intr_config_hook *hook;
   {
           struct intr_config_hook *hook_entry;
   
           for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
                hook_entry != NULL;
                hook_entry = TAILQ_NEXT(hook_entry, ich_links))
                   if (hook_entry == hook)
                           break;
           if (hook_entry == NULL)
                   panic("config_intrhook_disestablish: disestablishing an "
                         "unestablished hook");
   
           TAILQ_REMOVE(&intr_config_hook_list, hook, ich_links);
           /* Wakeup anyone watching the list */
           wakeup(&intr_config_hook_list);
   }

Cache object: 3404ea348a1a12f7f907246ee1a2ac40