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 1.14 2020/07/29 01:55:58 uwe Exp $  */
    2 
    3 /*
    4  * Copyright (c) 1988 University of Utah.
    5  * Copyright (c) 1990, 1993
    6  *      The Regents of the University of California.  All rights reserved.
    7  *
    8  * This code is derived from software contributed to Berkeley by
    9  * the Systems Programming Group of the University of Utah Computer
   10  * Science Department.
   11  *
   12  * Redistribution and use in source and binary forms, with or without
   13  * modification, are permitted provided that the following conditions
   14  * are met:
   15  * 1. Redistributions of source code must retain the above copyright
   16  *    notice, this list of conditions and the following disclaimer.
   17  * 2. Redistributions in binary form must reproduce the above copyright
   18  *    notice, this list of conditions and the following disclaimer in the
   19  *    documentation and/or other materials provided with the distribution.
   20  * 3. Neither the name of the University nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  * from: Utah $Hdr: cons.c 1.7 92/01/21$
   37  *
   38  *      @(#)cons.c      8.2 (Berkeley) 1/12/94
   39  */
   40 
   41 #include <sys/cdefs.h>
   42 __KERNEL_RCSID(0, "$NetBSD: cninit.c,v 1.14 2020/07/29 01:55:58 uwe Exp $");
   43 
   44 #include <sys/param.h>
   45 #include <sys/proc.h>
   46 #include <sys/systm.h>
   47 #include <sys/buf.h>
   48 #include <sys/ioctl.h>
   49 #include <sys/tty.h>
   50 #include <sys/file.h>
   51 #include <sys/conf.h>
   52 #include <sys/vnode.h>
   53 
   54 #include <dev/cons.h>
   55 
   56 void
   57 cninit(void)
   58 {
   59         struct consdev *bestMatch;
   60         struct consdev *cp;
   61 
   62         /*
   63          * Collect information about all possible consoles
   64          * and find the one with highest priority
   65          */
   66         bestMatch = NULL;
   67         for (cp = constab; cp->cn_probe; cp++) {
   68                 (*cp->cn_probe)(cp);
   69                 if (cp->cn_pri > CN_DEAD &&
   70                     (bestMatch == NULL || cp->cn_pri > bestMatch->cn_pri)) {
   71                         bestMatch = cp;
   72                 }
   73         }
   74 
   75         /*
   76          * No console, we can handle it
   77          */
   78         if (bestMatch == NULL)
   79                 return;
   80 
   81         /*
   82          * Turn on console
   83          */
   84         {
   85                 struct consdev *old_cn_tab = cn_tab;
   86 
   87                 /* cn_init may set cn_tab to self */
   88                 (*bestMatch->cn_init)(bestMatch);
   89 
   90                 /*
   91                  * Now let everyone know we have an active console they can
   92                  * use for diagnostics. If we use cn_tab in the search loop
   93                  * then interrupts from the ethernet at boot may cause system
   94                  * hang.
   95                  */
   96                 if (cn_tab == old_cn_tab) /* if cn_init didn't, set it */
   97                         cn_tab = bestMatch;
   98         }
   99 }

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