100 lines
3.1 KiB
C
100 lines
3.1 KiB
C
/* $NetBSD: cninit.c,v 1.14 2020/07/29 01:55:58 uwe Exp $ */
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/*
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* Copyright (c) 1988 University of Utah.
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: Utah $Hdr: cons.c 1.7 92/01/21$
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*
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* @(#)cons.c 8.2 (Berkeley) 1/12/94
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: cninit.c,v 1.14 2020/07/29 01:55:58 uwe Exp $");
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <sys/systm.h>
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#include <sys/buf.h>
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#include <sys/ioctl.h>
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#include <sys/tty.h>
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#include <sys/file.h>
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#include <sys/conf.h>
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#include <sys/vnode.h>
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#include <dev/cons.h>
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void
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cninit(void)
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{
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struct consdev *bestMatch;
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struct consdev *cp;
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/*
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* Collect information about all possible consoles
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* and find the one with highest priority
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*/
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bestMatch = NULL;
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for (cp = constab; cp->cn_probe; cp++) {
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(*cp->cn_probe)(cp);
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if (cp->cn_pri > CN_DEAD &&
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(bestMatch == NULL || cp->cn_pri > bestMatch->cn_pri)) {
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bestMatch = cp;
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}
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}
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/*
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* No console, we can handle it
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*/
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if (bestMatch == NULL)
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return;
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/*
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* Turn on console
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*/
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{
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struct consdev *old_cn_tab = cn_tab;
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/* cn_init may set cn_tab to self */
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(*bestMatch->cn_init)(bestMatch);
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/*
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* Now let everyone know we have an active console they can
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* use for diagnostics. If we use cn_tab in the search loop
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* then interrupts from the ethernet at boot may cause system
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* hang.
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*/
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if (cn_tab == old_cn_tab) /* if cn_init didn't, set it */
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cn_tab = bestMatch;
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}
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}
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