FreeBSD/Linux Kernel Cross Reference
sys/dev/sun/event_var.h

     /*      $NetBSD: event_var.h,v 1.7 2003/08/07 16:31:24 agc Exp $        */
     
     /*
      * 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.
     *
     *      from: @(#)event_var.h   8.1 (Berkeley) 6/11/93
     *      from: Hdr: event_var.h,v 1.5 92/11/26 01:11:51 torek Exp  (LBL)
     */
    
    /*
     * Internal `Firm_event' 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.
     */
    
    /* EV_QSIZE should be a power of two so that `%' is fast */
    #define EV_QSIZE        256     /* may need tuning; this uses 2k */
    
    struct evvar {
            u_int   ev_get;         /* get (read) index (modified synchronously) */
            volatile u_int ev_put;  /* put (write) index (modified by interrupt) */
            struct  selinfo ev_sel; /* process selecting */
            struct  proc *ev_io;    /* process that opened queue (can get SIGIO) */
            char    ev_wanted;      /* wake up on input ready */
            char    ev_async;       /* send SIGIO on input ready */
            struct  firm_event *ev_q;/* circular buffer (queue) of events */
    };
    
    #define splev() spltty()
    
    #define EV_WAKEUP(ev) { \
            selnotify(&(ev)->ev_sel, 0); \
            if ((ev)->ev_wanted) { \
                    (ev)->ev_wanted = 0; \
                    wakeup((caddr_t)(ev)); \
            } \
            if ((ev)->ev_async) \
                    psignal((ev)->ev_io, SIGIO); \
    }
    
    void    ev_init __P((struct evvar *));
    void    ev_fini __P((struct evvar *));
    int     ev_read __P((struct evvar *, struct uio *, int));
    int     ev_poll __P((struct evvar *, int, struct proc *));
    int     ev_kqfilter __P((struct evvar *, struct knote *));
    
    /*
     * Hook for 32-bit compatibility on a 64-bit kernel.
     */
    extern  int (*ev_out32_hook) __P((struct firm_event *, int, struct uio *));
    
    /*
     * PEVENT is set just above PSOCK, which is just above TTIPRI, on the
     * theory that mouse and keyboard `user' input should be quick.
     */
    #define PEVENT  23

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