sys/arch/atari/dev/event_var.h

   1 /*      $NetBSD: event_var.h,v 1.7 2008/03/01 14:16:49 rmind Exp $      */
   2
   3 /*
   4  * Copyright (c) 1992, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This software was developed by the Computer Systems Engineering group
   8  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
   9  * contributed to Berkeley.
  10  *
  11  * All advertising materials mentioning features or use of this software
  12  * must display the following acknowledgement:
  13  *      This product includes software developed by the University of
  14  *      California, Lawrence Berkeley Laboratory.
  15  *
  16  * Redistribution and use in source and binary forms, with or without
  17  * modification, are permitted provided that the following conditions
  18  * are met:
  19  * 1. Redistributions of source code must retain the above copyright
  20  *    notice, this list of conditions and the following disclaimer.
  21  * 2. Redistributions in binary form must reproduce the above copyright
  22  *    notice, this list of conditions and the following disclaimer in the
  23  *    documentation and/or other materials provided with the distribution.
  24  * 3. Neither the name of the University nor the names of its contributors
  25  *    may be used to endorse or promote products derived from this software
  26  *    without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  38  * SUCH DAMAGE.
  39  *
  40  *      @(#)event_var.h 8.1 (Berkeley) 6/11/93
  41  *
  42  * from: Header: event_var.h,v 1.5 92/11/26 01:11:51 torek Exp  (LBL)
  43  */
  44
  45 /*
  46  * Internal `Firm_event' interface for the keyboard and mouse drivers.
  47  * The drivers are expected not to place events in the queue above spltty(),
  48  * i.e., are expected to run off serial ports.
  49  */
  50
  51 /* EV_QSIZE should be a power of two so that `%' is fast */
  52 #define EV_QSIZE        256     /* may need tuning; this uses 2k */
  53
  54 struct evvar {
  55         u_int   ev_get;         /* get (read) index (modified synchronously) */
  56         volatile u_int ev_put;  /* put (write) index (modified by interrupt) */
  57         struct  selinfo ev_sel; /* process selecting */
  58         struct  proc *ev_io;    /* process that opened queue (can get SIGIO) */
  59         char    ev_wanted;      /* wake up on input ready */
  60         char    ev_async;       /* send SIGIO on input ready */
  61         struct  firm_event *ev_q;/* circular buffer (queue) of events */
  62 };
  63
  64 #define splev() spltty()
  65
  66 #define EV_WAKEUP(ev) { \
  67         selnotify(&(ev)->ev_sel, 0, 0); \
  68         if ((ev)->ev_wanted) { \
  69                 (ev)->ev_wanted = 0; \
  70                 wakeup((void *)(ev)); \
  71         } \
  72         if ((ev)->ev_async) \
  73                 psignal((ev)->ev_io, SIGIO); \
  74 }
  75
  76 void    ev_init(struct evvar *);
  77 void    ev_fini(struct evvar *);
  78 int     ev_read(struct evvar *, struct uio *, int);
  79 int     ev_poll(struct evvar *, int, struct lwp *);
  80 int     ev_kqfilter(struct evvar *, struct knote *);
  81
  82 /*
  83  * PEVENT is set just above PSOCK, which is just above TTIPRI, on the
  84  * theory that mouse and keyboard `user' input should be quick.
  85  */
  86 #define PEVENT  23