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/dev/cninit.c

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    1 /*      $NetBSD: cninit.c,v 1.6 2003/10/21 17:03:52 tsutsui Exp $       */
    2 
    3 /*
    4  * Copyright (c) 1990, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * This code is derived from software contributed to Berkeley by
    8  * the Systems Programming Group of the University of Utah Computer
    9  * Science Department.
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  * 3. Neither the name of the University nor the names of its contributors
   20  *    may be used to endorse or promote products derived from this software
   21  *    without specific prior written permission.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   33  * SUCH DAMAGE.
   34  *
   35  * from: Utah $Hdr: cons.c 1.7 92/01/21$
   36  *
   37  *      @(#)cons.c      8.2 (Berkeley) 1/12/94
   38  */
   39 
   40 /*
   41  * Copyright (c) 1988 University of Utah.
   42  *
   43  * This code is derived from software contributed to Berkeley by
   44  * the Systems Programming Group of the University of Utah Computer
   45  * Science Department.
   46  *
   47  * Redistribution and use in source and binary forms, with or without
   48  * modification, are permitted provided that the following conditions
   49  * are met:
   50  * 1. Redistributions of source code must retain the above copyright
   51  *    notice, this list of conditions and the following disclaimer.
   52  * 2. Redistributions in binary form must reproduce the above copyright
   53  *    notice, this list of conditions and the following disclaimer in the
   54  *    documentation and/or other materials provided with the distribution.
   55  * 3. All advertising materials mentioning features or use of this software
   56  *    must display the following acknowledgement:
   57  *      This product includes software developed by the University of
   58  *      California, Berkeley and its contributors.
   59  * 4. Neither the name of the University nor the names of its contributors
   60  *    may be used to endorse or promote products derived from this software
   61  *    without specific prior written permission.
   62  *
   63  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   64  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   65  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   66  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   67  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   68  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   69  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   70  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   71  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   72  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   73  * SUCH DAMAGE.
   74  *
   75  * from: Utah $Hdr: cons.c 1.7 92/01/21$
   76  *
   77  *      @(#)cons.c      8.2 (Berkeley) 1/12/94
   78  */
   79 
   80 #include <sys/cdefs.h>
   81 __KERNEL_RCSID(0, "$NetBSD: cninit.c,v 1.6 2003/10/21 17:03:52 tsutsui Exp $");
   82 
   83 #include <sys/param.h>
   84 #include <sys/proc.h>
   85 #include <sys/user.h>
   86 #include <sys/systm.h>
   87 #include <sys/buf.h>
   88 #include <sys/ioctl.h>
   89 #include <sys/tty.h>
   90 #include <sys/file.h>
   91 #include <sys/conf.h>
   92 #include <sys/vnode.h>
   93 
   94 #include <dev/cons.h>
   95 
   96 void
   97 cninit()
   98 {
   99         struct consdev *cp;
  100         struct consdev *bestMatch;
  101         
  102         bestMatch = cn_tab = NULL;
  103         /*
  104          * Collect information about all possible consoles
  105          * and find the one with highest priority
  106          */
  107         for (cp = constab; cp->cn_probe; cp++) {
  108                 (*cp->cn_probe)(cp);
  109                 if (cp->cn_pri > CN_DEAD &&
  110                     (bestMatch == NULL || cp->cn_pri > bestMatch->cn_pri)) {
  111                         bestMatch = cp;
  112                 }
  113         }
  114         /*
  115          * No console, we can handle it
  116          */
  117         if ((cp = bestMatch) == NULL)
  118                 return;
  119         /*
  120          * Turn on console
  121          */
  122         {
  123                 struct consdev *old_cn_tab = cn_tab;
  124 
  125                 (*cp->cn_init)(cp);
  126                 /*
  127                  * Now let everyone know we have an active console they can
  128                  * use for diagnostics. If we use cn_tab in the search loop
  129                  * then interrupts from the ethernet at boot may cause system
  130                  * hang.
  131                  */
  132                 if (cn_tab == old_cn_tab)
  133                         cn_tab = bestMatch;
  134         }
  135 }

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