7108a194c1
definition structure. Define one flag, CN_FLAG_NODEBUG, which indicates the console driver cannot be used in the context of the debugger. This may be used, for example, if the console device interacts with kernel services that cannot be used from the debugger context, such as the network stack. These drivers are skipped over for calls to cn_checkc() and cn_putc(), and the calling function simply moves on to the next available console.
110 lines
4.1 KiB
C
110 lines
4.1 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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* $FreeBSD$
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*/
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#ifndef _MACHINE_CONS_H_
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#define _MACHINE_CONS_H_
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struct consdev;
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typedef void cn_probe_t(struct consdev *);
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typedef void cn_init_t(struct consdev *);
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typedef void cn_term_t(struct consdev *);
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typedef int cn_getc_t(struct consdev *);
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typedef int cn_checkc_t(struct consdev *);
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typedef void cn_putc_t(struct consdev *, int);
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typedef void cn_dbctl_t(struct consdev *, int);
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struct consdev {
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cn_probe_t *cn_probe;
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/* probe hardware and fill in consdev info */
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cn_init_t *cn_init;
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/* turn on as console */
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cn_term_t *cn_term;
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/* turn off as console */
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cn_getc_t *cn_getc;
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/* kernel getchar interface */
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cn_checkc_t *cn_checkc;
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/* kernel "return char if available" interface */
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cn_putc_t *cn_putc;
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/* kernel putchar interface */
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cn_dbctl_t *cn_dbctl;
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/* debugger control interface */
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struct tty *cn_tp; /* tty structure for console device */
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short cn_pri; /* pecking order; the higher the better */
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void *cn_arg; /* drivers method argument */
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int cn_unit; /* some drivers prefer this */
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int cn_flags; /* capabilities of this console */
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char cn_name[SPECNAMELEN + 1]; /* console (device) name */
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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_LOW 1 /* device is a last restort only */
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#define CN_NORMAL 2 /* device exists but is nothing special */
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#define CN_INTERNAL 3 /* "internal" bit-mapped display */
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#define CN_REMOTE 4 /* serial interface with remote bit set */
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/* Values for cn_flags. */
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#define CN_FLAG_NODEBUG 0x00000001 /* Not supported with debugger. */
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#ifdef _KERNEL
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extern int cons_unavail;
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#define CONS_DRIVER(name, probe, init, term, getc, checkc, putc, dbctl) \
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static struct consdev name##_consdev = { \
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probe, init, term, getc, checkc, putc, dbctl \
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}; \
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DATA_SET(cons_set, name##_consdev)
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/* Other kernel entry points. */
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void cninit(void);
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void cninit_finish(void);
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int cnadd(struct consdev *);
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void cnremove(struct consdev *);
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void cnselect(struct consdev *);
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int cncheckc(void);
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int cngetc(void);
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void cndbctl(int);
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void cnputc(int);
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#endif /* _KERNEL */
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#endif /* !_MACHINE_CONS_H_ */
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