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/10.4/sys/sys/cons.h 270988 2014-09-02 22:01:14Z emaste $
   36  */
   37 
   38 #ifndef _MACHINE_CONS_H_
   39 #define _MACHINE_CONS_H_
   40 
   41 struct consdev;
   42 struct tty;
   43 
   44 typedef void    cn_probe_t(struct consdev *);
   45 typedef void    cn_init_t(struct consdev *);
   46 typedef void    cn_term_t(struct consdev *);
   47 typedef void    cn_grab_t(struct consdev *);
   48 typedef void    cn_ungrab_t(struct consdev *);
   49 typedef int     cn_getc_t(struct consdev *);
   50 typedef void    cn_putc_t(struct consdev *, int);
   51 
   52 struct consdev_ops {
   53         cn_probe_t      *cn_probe;
   54                                 /* probe hardware and fill in consdev info */
   55         cn_init_t       *cn_init;
   56                                 /* turn on as console */
   57         cn_term_t       *cn_term;
   58                                 /* turn off as console */
   59         cn_getc_t       *cn_getc;
   60                                 /* kernel getchar interface */
   61         cn_putc_t       *cn_putc;
   62                                 /* kernel putchar interface */
   63         cn_grab_t       *cn_grab;
   64                                 /* grab console for exclusive kernel use */
   65         cn_ungrab_t     *cn_ungrab;
   66                                 /* ungrab console */
   67 };
   68 
   69 struct consdev {
   70         const struct consdev_ops *cn_ops;
   71                                 /* console device operations. */
   72         short   cn_pri;         /* pecking order; the higher the better */
   73         void    *cn_arg;        /* drivers method argument */
   74         int     cn_flags;       /* capabilities of this console */
   75         char    cn_name[SPECNAMELEN + 1];       /* console (device) name */
   76 };
   77 
   78 /* values for cn_pri - reflect our policy for console selection */
   79 #define CN_DEAD         0       /* device doesn't exist */
   80 #define CN_LOW          1       /* device is a last restort only */
   81 #define CN_NORMAL       2       /* device exists but is nothing special */
   82 #define CN_INTERNAL     3       /* "internal" bit-mapped display */
   83 #define CN_REMOTE       4       /* serial interface with remote bit set */
   84 
   85 /* Values for cn_flags. */
   86 #define CN_FLAG_NODEBUG 0x00000001      /* Not supported with debugger. */
   87 #define CN_FLAG_NOAVAIL 0x00000002      /* Temporarily not available. */
   88 
   89 /* Visibility of characters in cngets() */
   90 #define GETS_NOECHO     0       /* Disable echoing of characters. */
   91 #define GETS_ECHO       1       /* Enable echoing of characters. */
   92 #define GETS_ECHOPASS   2       /* Print a * for every character. */
   93 
   94 #ifdef _KERNEL
   95 
   96 extern  struct msgbuf consmsgbuf; /* Message buffer for constty. */
   97 extern  struct tty *constty;    /* Temporary virtual console. */
   98 
   99 #define CONSOLE_DEVICE(name, ops, arg)                                  \
  100         static struct consdev name = {                                  \
  101                 .cn_ops = &ops,                                         \
  102                 .cn_arg = (arg),                                        \
  103         };                                                              \
  104         DATA_SET(cons_set, name)
  105 
  106 #define CONSOLE_DRIVER(name)                                            \
  107         static const struct consdev_ops name##_consdev_ops = {          \
  108                 .cn_probe = name##_cnprobe,                             \
  109                 .cn_init = name##_cninit,                               \
  110                 .cn_term = name##_cnterm,                               \
  111                 .cn_getc = name##_cngetc,                               \
  112                 .cn_putc = name##_cnputc,                               \
  113                 .cn_grab = name##_cngrab,                               \
  114                 .cn_ungrab = name##_cnungrab,                           \
  115         };                                                              \
  116         CONSOLE_DEVICE(name##_consdev, name##_consdev_ops, NULL)
  117 
  118 /* Other kernel entry points. */
  119 void    cninit(void);
  120 void    cninit_finish(void);
  121 int     cnadd(struct consdev *);
  122 void    cnavailable(struct consdev *, int);
  123 void    cnremove(struct consdev *);
  124 void    cnselect(struct consdev *);
  125 void    cngrab(void);
  126 void    cnungrab(void);
  127 int     cncheckc(void);
  128 int     cngetc(void);
  129 void    cngets(char *, size_t, int);
  130 void    cnputc(int);
  131 void    cnputs(char *);
  132 int     cnunavailable(void);
  133 void    constty_set(struct tty *tp);
  134 void    constty_clear(void);
  135 
  136 /* sc(4) / vt(4) coexistence shim */
  137 #define VTY_SC 0x01
  138 #define VTY_VT 0x02
  139 int     vty_enabled(unsigned int);
  140 void    vty_set_preferred(unsigned int);
  141 
  142 #endif /* _KERNEL */
  143 
  144 #endif /* !_MACHINE_CONS_H_ */

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