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/sys/cons.h

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    1 /*-
    2  * Copyright (c) 1988 University of Utah.
    3  * Copyright (c) 1991 The Regents of the University of California.
    4  * All rights reserved.
    5  *
    6  * This code is derived from software contributed to Berkeley by
    7  * the Systems Programming Group of the University of Utah Computer
    8  * Science Department.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 4. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      from: @(#)cons.h        7.2 (Berkeley) 5/9/91
   35  * $FreeBSD: releng/6.4/sys/sys/cons.h 139825 2005-01-07 02:29:27Z imp $
   36  */
   37 
   38 #ifndef _MACHINE_CONS_H_
   39 #define _MACHINE_CONS_H_
   40 
   41 struct consdev;
   42 typedef void    cn_probe_t(struct consdev *);
   43 typedef void    cn_init_t(struct consdev *);
   44 typedef void    cn_term_t(struct consdev *);
   45 typedef int     cn_getc_t(struct consdev *);
   46 typedef int     cn_checkc_t(struct consdev *);
   47 typedef void    cn_putc_t(struct consdev *, int);
   48 typedef void    cn_dbctl_t(struct consdev *, int);
   49 
   50 struct consdev {
   51         cn_probe_t      *cn_probe;
   52                                 /* probe hardware and fill in consdev info */
   53         cn_init_t       *cn_init;
   54                                 /* turn on as console */
   55         cn_term_t       *cn_term;
   56                                 /* turn off as console */
   57         cn_getc_t       *cn_getc;
   58                                 /* kernel getchar interface */
   59         cn_checkc_t     *cn_checkc;
   60                                 /* kernel "return char if available" interface */
   61         cn_putc_t       *cn_putc;
   62                                 /* kernel putchar interface */
   63         cn_dbctl_t      *cn_dbctl;
   64                                 /* debugger control interface */
   65         struct  tty *cn_tp;     /* tty structure for console device */
   66         short   cn_pri;         /* pecking order; the higher the better */
   67         void    *cn_arg;        /* drivers method argument */
   68         int     cn_unit;        /* some drivers prefer this */
   69         int     cn_flags;       /* capabilities of this console */
   70         char    cn_name[SPECNAMELEN + 1];       /* console (device) name */
   71 };
   72 
   73 /* values for cn_pri - reflect our policy for console selection */
   74 #define CN_DEAD         0       /* device doesn't exist */
   75 #define CN_LOW          1       /* device is a last restort only */
   76 #define CN_NORMAL       2       /* device exists but is nothing special */
   77 #define CN_INTERNAL     3       /* "internal" bit-mapped display */
   78 #define CN_REMOTE       4       /* serial interface with remote bit set */
   79 
   80 /* Values for cn_flags. */
   81 #define CN_FLAG_NODEBUG 0x00000001      /* Not supported with debugger. */
   82 #define CN_FLAG_NOAVAIL 0x00000002      /* Temporarily not available. */
   83 
   84 #ifdef _KERNEL
   85 
   86 #define CONS_DRIVER(name, probe, init, term, getc, checkc, putc, dbctl) \
   87         static struct consdev name##_consdev = {                        \
   88                 probe, init, term, getc, checkc, putc, dbctl            \
   89         };                                                              \
   90         DATA_SET(cons_set, name##_consdev)
   91 
   92 /* Other kernel entry points. */
   93 void    cninit(void);
   94 void    cninit_finish(void);
   95 int     cnadd(struct consdev *);
   96 void    cnavailable(struct consdev *, int);
   97 void    cnremove(struct consdev *);
   98 void    cnselect(struct consdev *);
   99 int     cncheckc(void);
  100 int     cngetc(void);
  101 void    cndbctl(int);
  102 void    cnputc(int);
  103 int     cnunavailable(void);
  104 
  105 #endif /* _KERNEL */
  106 
  107 #endif /* !_MACHINE_CONS_H_ */

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