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 /*      $OpenBSD: cninit.c,v 1.15 2017/12/30 20:46:59 guenther Exp $    */
    2 /*      $NetBSD: cninit.c,v 1.2 1995/04/11 22:08:10 pk Exp $    */
    3 
    4 /*
    5  * Copyright (c) 1988 University of Utah.
    6  * Copyright (c) 1990, 1993
    7  *      The Regents of the University of California.  All rights reserved.
    8  *
    9  * This code is derived from software contributed to Berkeley by
   10  * the Systems Programming Group of the University of Utah Computer
   11  * Science Department.
   12  *
   13  * Redistribution and use in source and binary forms, with or without
   14  * modification, are permitted provided that the following conditions
   15  * are met:
   16  * 1. Redistributions of source code must retain the above copyright
   17  *    notice, this list of conditions and the following disclaimer.
   18  * 2. Redistributions in binary form must reproduce the above copyright
   19  *    notice, this list of conditions and the following disclaimer in the
   20  *    documentation and/or other materials provided with the distribution.
   21  * 3. Neither the name of the University nor the names of its contributors
   22  *    may be used to endorse or promote products derived from this software
   23  *    without specific prior written permission.
   24  *
   25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   35  * SUCH DAMAGE.
   36  *
   37  * from: Utah $Hdr: cons.c 1.7 92/01/21$
   38  *
   39  *      @(#)cons.c      8.2 (Berkeley) 1/12/94
   40  */
   41 
   42 #include <sys/param.h>
   43 #include <sys/systm.h>
   44 #include <sys/ioctl.h>
   45 #include <sys/tty.h>
   46 #include <sys/conf.h>
   47 #include <sys/vnode.h>
   48 
   49 #include <dev/cons.h>
   50 
   51 struct consdev *cn_tab = NULL;
   52 
   53 void
   54 cninit(void)
   55 {
   56         struct consdev *cp;
   57 
   58         /*
   59          * Collect information about all possible consoles
   60          * and find the one with highest priority.
   61          */
   62         for (cp = constab; cp->cn_probe; cp++) {
   63                 (*cp->cn_probe)(cp);
   64                 if (cp->cn_pri != CN_DEAD &&
   65                     (cn_tab == NULL || cp->cn_pri > cn_tab->cn_pri))
   66                         cn_tab = cp;
   67         }
   68 
   69         /*
   70          * No console, we can handle it.
   71          */
   72         if ((cp = cn_tab) == NULL)
   73                 return;
   74 
   75         /*
   76          * Turn on console.
   77          */
   78         (*cp->cn_init)(cp);
   79 }

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