FreeBSD/Linux Kernel Cross Reference
sys/sys/cons.h

     /*-
      * Copyright (c) 1988 University of Utah.
      * Copyright (c) 1991 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.
     * 4. 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: @(#)cons.h        7.2 (Berkeley) 5/9/91
     * $FreeBSD: releng/9.0/sys/sys/cons.h 196506 2009-08-24 10:53:30Z ed $
     */
    
    #ifndef _MACHINE_CONS_H_
    #define _MACHINE_CONS_H_
    
    struct consdev;
    struct tty;
    
    typedef void    cn_probe_t(struct consdev *);
    typedef void    cn_init_t(struct consdev *);
    typedef void    cn_term_t(struct consdev *);
    typedef int     cn_getc_t(struct consdev *);
    typedef void    cn_putc_t(struct consdev *, int);
    
    struct consdev_ops {
            cn_probe_t      *cn_probe;
                                    /* probe hardware and fill in consdev info */
            cn_init_t       *cn_init;
                                    /* turn on as console */
            cn_term_t       *cn_term;
                                    /* turn off as console */
            cn_getc_t       *cn_getc;
                                    /* kernel getchar interface */
            cn_putc_t       *cn_putc;
                                    /* kernel putchar interface */
    };
    
    struct consdev {
            const struct consdev_ops *cn_ops;
                                    /* console device operations. */
            short   cn_pri;         /* pecking order; the higher the better */
            void    *cn_arg;        /* drivers method argument */
            int     cn_flags;       /* capabilities of this console */
            char    cn_name[SPECNAMELEN + 1];       /* console (device) name */
    };
    
    /* values for cn_pri - reflect our policy for console selection */
    #define CN_DEAD         0       /* device doesn't exist */
    #define CN_LOW          1       /* device is a last restort only */
    #define CN_NORMAL       2       /* device exists but is nothing special */
    #define CN_INTERNAL     3       /* "internal" bit-mapped display */
    #define CN_REMOTE       4       /* serial interface with remote bit set */
    
    /* Values for cn_flags. */
    #define CN_FLAG_NODEBUG 0x00000001      /* Not supported with debugger. */
    #define CN_FLAG_NOAVAIL 0x00000002      /* Temporarily not available. */
    
    #ifdef _KERNEL
    
    extern  struct msgbuf consmsgbuf; /* Message buffer for constty. */
    extern  struct tty *constty;    /* Temporary virtual console. */
    
    #define CONSOLE_DEVICE(name, ops, arg)                                  \
            static struct consdev name = {                                  \
                    .cn_ops = &ops,                                         \
                    .cn_arg = (arg),                                        \
            };                                                              \
            DATA_SET(cons_set, name)
    
    #define CONSOLE_DRIVER(name)                                            \
            static const struct consdev_ops name##_consdev_ops = {          \
                    .cn_probe = name##_cnprobe,                             \
                    .cn_init = name##_cninit,                               \
                    .cn_term = name##_cnterm,                               \
                   .cn_getc = name##_cngetc,                               \
                   .cn_putc = name##_cnputc,                               \
           };                                                              \
           CONSOLE_DEVICE(name##_consdev, name##_consdev_ops, NULL)
   
   /* Other kernel entry points. */
   void    cninit(void);
   void    cninit_finish(void);
   int     cnadd(struct consdev *);
   void    cnavailable(struct consdev *, int);
   void    cnremove(struct consdev *);
   void    cnselect(struct consdev *);
   int     cncheckc(void);
   int     cngetc(void);
   void    cnputc(int);
   void    cnputs(char *);
   int     cnunavailable(void);
   void    constty_set(struct tty *tp);
   void    constty_clear(void);
   
   #endif /* _KERNEL */
   
   #endif /* !_MACHINE_CONS_H_ */

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