2feff74c28
drivers to protect DDB from being invoked while the console is in process-controlled (i.e., graphics) mode. Implement the logic to use this hook from within pcvt. (I'm sure Søren will do the syscons part RSN). I've still got one occasion where the system stalled, but my attempts to trigger the situation artificially resulted int the expected behaviour. It's hard to track bugs without the console and DDB available. :-/
90 lines
3.6 KiB
C
90 lines
3.6 KiB
C
/*
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* Copyright (c) 1988 University of Utah.
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* Copyright (c) 1991 The Regents of the University of California.
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* 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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: @(#)cons.h 7.2 (Berkeley) 5/9/91
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* $Id: cons.h,v 1.6 1994/10/20 00:07:46 phk Exp $
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*/
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#ifndef _MACHINE_CONS_H_
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#define _MACHINE_CONS_H_ 1
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struct consdev {
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int (*cn_probe)(); /* probe hardware and fill in consdev info */
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int (*cn_init)(); /* turn on as console */
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int (*cn_getc)(); /* kernel getchar interface */
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int (*cn_checkc)(); /* kernel "return char if available" interface */
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int (*cn_putc)(); /* kernel putchar interface */
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struct tty *cn_tp; /* tty structure for console device */
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dev_t cn_dev; /* major/minor of device */
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short cn_pri; /* pecking order; the higher the better */
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};
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/* values for cn_pri - reflect our policy for console selection */
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#define CN_DEAD 0 /* device doesn't exist */
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#define CN_NORMAL 1 /* device exists but is nothing special */
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#define CN_INTERNAL 2 /* "internal" bit-mapped display */
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#define CN_REMOTE 3 /* serial interface with remote bit set */
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/* XXX */
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#define CONSMAJOR 0
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#ifdef KERNEL
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extern struct consdev constab[];
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extern struct consdev *cn_tab;
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extern struct tty *cn_tty;
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extern int cons_unavail;
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struct proc; struct uio;
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/* cdevsw[] entries */
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extern int cnopen(dev_t, int, int, struct proc *);
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extern int cnclose(dev_t, int, int, struct proc *);
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extern int cnread(dev_t, struct uio *, int);
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extern int cnwrite(dev_t, struct uio *, int);
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extern int cnioctl(dev_t, int, caddr_t, int, struct proc *);
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extern int cnselect(dev_t, int, struct proc *);
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/* other kernel entry points */
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extern void cninit(void);
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extern int cngetc(void);
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extern int cncheckc(void);
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extern void cnputc(int /*char*/);
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extern int pg(const char *, ...);
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#endif /* KERNEL */
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#endif /* _MACHINE_CONS_H_ */
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