96 lines
3.0 KiB
C
96 lines
3.0 KiB
C
/* $NetBSD: cninit.c,v 1.11 2011/02/08 20:20:26 rmind Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1988 University of Utah.
|
|
* Copyright (c) 1990, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* the Systems Programming Group of the University of Utah Computer
|
|
* Science Department.
|
|
*
|
|
* 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. 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.
|
|
*
|
|
* from: Utah $Hdr: cons.c 1.7 92/01/21$
|
|
*
|
|
* @(#)cons.c 8.2 (Berkeley) 1/12/94
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: cninit.c,v 1.11 2011/02/08 20:20:26 rmind Exp $");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/buf.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/tty.h>
|
|
#include <sys/file.h>
|
|
#include <sys/conf.h>
|
|
#include <sys/vnode.h>
|
|
|
|
#include <dev/cons.h>
|
|
|
|
void
|
|
cninit(void)
|
|
{
|
|
struct consdev *cp;
|
|
struct consdev *bestMatch;
|
|
|
|
bestMatch = cn_tab = NULL;
|
|
/*
|
|
* Collect information about all possible consoles
|
|
* and find the one with highest priority
|
|
*/
|
|
for (cp = constab; cp->cn_probe; cp++) {
|
|
(*cp->cn_probe)(cp);
|
|
if (cp->cn_pri > CN_DEAD &&
|
|
(bestMatch == NULL || cp->cn_pri > bestMatch->cn_pri)) {
|
|
bestMatch = cp;
|
|
}
|
|
}
|
|
/*
|
|
* No console, we can handle it
|
|
*/
|
|
if ((cp = bestMatch) == NULL)
|
|
return;
|
|
/*
|
|
* Turn on console
|
|
*/
|
|
{
|
|
struct consdev *old_cn_tab = cn_tab;
|
|
|
|
(*cp->cn_init)(cp);
|
|
/*
|
|
* Now let everyone know we have an active console they can
|
|
* use for diagnostics. If we use cn_tab in the search loop
|
|
* then interrupts from the ethernet at boot may cause system
|
|
* hang.
|
|
*/
|
|
if (cn_tab == old_cn_tab)
|
|
cn_tab = bestMatch;
|
|
}
|
|
}
|