FreeBSD/Linux Kernel Cross Reference
sys/dev/wscons/wseventvar.h

     /* $NetBSD: wseventvar.h,v 1.8 2003/08/07 16:31:29 agc Exp $ */
     
     /*
      * Copyright (c) 1996, 1997 Christopher G. Demetriou.  All rights reserved.
      *
      * 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 Christopher G. Demetriou
     *      for the NetBSD Project.
     * 4. The name of the author may not be used to endorse or promote products
     *    derived from this software without specific prior written permission
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
     */
    
    /*
     * Copyright (c) 1992, 1993
     *      The Regents of the University of California.  All rights reserved.
     *
     * This software was developed by the Computer Systems Engineering group
     * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
     * contributed to Berkeley.
     *
     * 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, Lawrence Berkeley Laboratory.
     *
     * 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. 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.
     *
     *      @(#)event_var.h 8.1 (Berkeley) 6/11/93
     */
    
    /*
     * Internal "wscons_event" queue interface for the keyboard and mouse drivers.
     * The drivers are expected not to place events in the queue above spltty(),
     * i.e., are expected to run off serial ports or similar devices.
     */
    
    /* WSEVENT_QSIZE should be a power of two so that `%' is fast */
    #define WSEVENT_QSIZE   256     /* may need tuning; this uses 2k */
    
    struct wseventvar {
            u_int   get;            /* get (read) index (modified synchronously) */
            volatile u_int put;     /* put (write) index (modified by interrupt) */
            struct selinfo sel;     /* process selecting */
            struct proc *io;        /* process that opened queue (can get SIGIO) */
            int     wanted;         /* wake up on input ready */
            int     async;          /* send SIGIO on input ready */
            struct wscons_event *q; /* circular buffer (queue) of events */
    };
    
    #define splwsevent()    spltty()
    
    #define WSEVENT_WAKEUP(ev) { \
            selnotify(&(ev)->sel, 0); \
            if ((ev)->wanted) { \
                    (ev)->wanted = 0; \
                    wakeup((ev)); \
            } \
           if ((ev)->async) \
                   psignal((ev)->io, SIGIO); \
   }
   
   void    wsevent_init(struct wseventvar *);
   void    wsevent_fini(struct wseventvar *);
   int     wsevent_read(struct wseventvar *, struct uio *, int);
   int     wsevent_poll(struct wseventvar *, int, struct proc *);
   int     wsevent_kqfilter(struct wseventvar *ev, struct knote *kn);
   
   /*
    * PWSEVENT is set just above PSOCK, which is just above TTIPRI, on the
    * theory that mouse and keyboard `user' input should be quick.
    */
   #define PWSEVENT        23

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