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event_var.h revision 1.2 
      1 /*	$NetBSD: event_var.h,v 1.2 1994/10/26 02:03:00 cgd 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. All advertising materials mentioning features or use of this software
     25  *    must display the following acknowledgement:
     26  *	This product includes software developed by the University of
     27  *	California, Berkeley and its contributors.
     28  * 4. Neither the name of the University nor the names of its contributors
     29  *    may be used to endorse or promote products derived from this software
     30  *    without specific prior written permission.
     31  *
     32  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     33  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     34  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     35  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     36  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     40  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     41  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     42  * SUCH DAMAGE.
     43  *
     44  *	@(#)event_var.h	8.1 (Berkeley) 6/11/93
     45  *
     46  * Header: event_var.h,v 1.5 92/11/26 01:11:51 torek Exp  (LBL)
     47  */
     48 
     49 /*
     50  * Internal `Firm_event' interface for the keyboard and mouse drivers.
     51  * The drivers are expected not to place events in the queue above spltty(),
     52  * i.e., are expected to run off serial ports.
     53  */
     54 
     55 /* EV_QSIZE should be a power of two so that `%' is fast */
     56 #define	EV_QSIZE	256	/* may need tuning; this uses 2k */
     57 
     58 struct evvar {
     59 	u_int	ev_get;		/* get (read) index (modified synchronously) */
     60 	volatile u_int ev_put;	/* put (write) index (modified by interrupt) */
     61 	struct	selinfo ev_sel;	/* process selecting */
     62 	struct	proc *ev_io;	/* process that opened queue (can get SIGIO) */
     63 	char	ev_wanted;	/* wake up on input ready */
     64 	char	ev_async;	/* send SIGIO on input ready */
     65 	struct	firm_event *ev_q;/* circular buffer (queue) of events */
     66 };
     67 
     68 #define	splev()	spltty()
     69 
     70 #define	EV_WAKEUP(ev) { \
     71 	selwakeup(&(ev)->ev_sel); \
     72 	if ((ev)->ev_wanted) { \
     73 		(ev)->ev_wanted = 0; \
     74 		wakeup((caddr_t)(ev)); \
     75 	} \
     76 	if ((ev)->ev_async) \
     77 		psignal((ev)->ev_io, SIGIO); \
     78 }
     79 
     80 void	ev_init __P((struct evvar *));
     81 void	ev_fini __P((struct evvar *));
     82 int	ev_read __P((struct evvar *, struct uio *, int));
     83 int	ev_select __P((struct evvar *, int, struct proc *));
     84 
     85 /*
     86  * PEVENT is set just above PSOCK, which is just above TTIPRI, on the
     87  * theory that mouse and keyboard `user' input should be quick.
     88  */
     89 #define	PEVENT	23
     90