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.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 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
     * $FreeBSD$
     */
    
    #ifndef _MACHINE_CONS_H_
    #define _MACHINE_CONS_H_
    
    struct consdev;
    typedef void    cn_probe_t __P((struct consdev *));
    typedef void    cn_init_t __P((struct consdev *));
    typedef void    cn_term_t __P((struct consdev *));
    typedef int     cn_getc_t __P((dev_t));
    typedef int     cn_checkc_t __P((dev_t));
    typedef void    cn_putc_t __P((dev_t, int));
    typedef void    cn_dbctl_t __P((dev_t, int));
    
    struct consdev {
            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_checkc_t     *cn_checkc;
                                    /* kernel "return char if available" interface */
            cn_putc_t       *cn_putc;
                                    /* kernel putchar interface */
            cn_dbctl_t      *cn_dbctl;
                                    /* debugger control interface */
            struct  tty *cn_tp;     /* tty structure for console device */
            dev_t   cn_dev;         /* major/minor of device */
            short   cn_pri;         /* pecking order; the higher the better */
    };
    
    /* values for cn_pri - reflect our policy for console selection */
    #define CN_DEAD         0       /* device doesn't exist */
    #define CN_NORMAL       1       /* device exists but is nothing special */
    #define CN_INTERNAL     2       /* "internal" bit-mapped display */
    #define CN_REMOTE       3       /* serial interface with remote bit set */
    
    #ifdef _KERNEL
    extern  struct linker_set cons_set;
    extern  int cons_unavail;
    extern  struct consdev *cn_tab;
    
    #define CONS_DRIVER(name, probe, init, term, getc, checkc, putc, dbctl) \
            static struct consdev name##_consdev = {                        \
                    probe, init, term, getc, checkc, putc, dbctl            \
            };                                                              \
            DATA_SET(cons_set, name##_consdev)
    
    /* Other kernel entry points. */
    int     cncheckc __P((void));
    int     cngetc __P((void));
    void    cninit __P((void));
    void    cninit_finish __P((void));
    void    cndbctl __P((int));
    void    cnputc __P((int));
    
    #endif /* _KERNEL */
   
   #endif /* !_MACHINE_CONS_H_ */

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