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event_var.h revision 1.1 
      1 /*
      2  * Copyright (c) 1992, 1993
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * This software was developed by the Computer Systems Engineering group
      6  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
      7  * contributed to Berkeley.
      8  *
      9  * All advertising materials mentioning features or use of this software
     10  * must display the following acknowledgement:
     11  *	This product includes software developed by the University of
     12  *	California, Lawrence Berkeley Laboratory.
     13  *
     14  * Redistribution and use in source and binary forms, with or without
     15  * modification, are permitted provided that the following conditions
     16  * are met:
     17  * 1. Redistributions of source code must retain the above copyright
     18  *    notice, this list of conditions and the following disclaimer.
     19  * 2. Redistributions in binary form must reproduce the above copyright
     20  *    notice, this list of conditions and the following disclaimer in the
     21  *    documentation and/or other materials provided with the distribution.
     22  * 3. All advertising materials mentioning features or use of this software
     23  *    must display the following acknowledgement:
     24  *	This product includes software developed by the University of
     25  *	California, Berkeley and its contributors.
     26  * 4. Neither the name of the University nor the names of its contributors
     27  *    may be used to endorse or promote products derived from this software
     28  *    without specific prior written permission.
     29  *
     30  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     31  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     32  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     33  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     34  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     35  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     36  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     37  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     38  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     39  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     40  * SUCH DAMAGE.
     41  *
     42  *	@(#)event_var.h	8.1 (Berkeley) 6/11/93
     43  *
     44  * from: Header: event_var.h,v 1.5 92/11/26 01:11:51 torek Exp  (LBL)
     45  * $Id: event_var.h,v 1.1 1994/01/26 21:05:42 mw Exp $
     46  */
     47 
     48 /*
     49  * Internal `Firm_event' interface for the keyboard and mouse drivers.
     50  * The drivers are expected not to place events in the queue above spltty(),
     51  * i.e., are expected to run off serial ports.
     52  */
     53 
     54 /* EV_QSIZE should be a power of two so that `%' is fast */
     55 #define	EV_QSIZE	256	/* may need tuning; this uses 2k */
     56 
     57 struct evvar {
     58 	u_int	ev_get;		/* get (read) index (modified synchronously) */
     59 	volatile u_int ev_put;	/* put (write) index (modified by interrupt) */
     60 	struct	selinfo ev_sel;	/* process selecting */
     61 	struct	proc *ev_io;	/* process that opened queue (can get SIGIO) */
     62 	char	ev_wanted;	/* wake up on input ready */
     63 	char	ev_async;	/* send SIGIO on input ready */
     64 	struct	firm_event *ev_q;/* circular buffer (queue) of events */
     65 };
     66 
     67 #define	splev()	spltty()
     68 
     69 #define	EV_WAKEUP(ev) { \
     70 	selwakeup(&(ev)->ev_sel); \
     71 	if ((ev)->ev_wanted) { \
     72 		(ev)->ev_wanted = 0; \
     73 		wakeup((caddr_t)(ev)); \
     74 	} \
     75 	if ((ev)->ev_async) \
     76 		psignal((ev)->ev_io, SIGIO); \
     77 }
     78 
     79 void	ev_init __P((struct evvar *));
     80 void	ev_fini __P((struct evvar *));
     81 int	ev_read __P((struct evvar *, struct uio *, int));
     82 int	ev_select __P((struct evvar *, int, struct proc *));
     83 
     84 /*
     85  * PEVENT is set just above PSOCK, which is just above TTIPRI, on the
     86  * theory that mouse and keyboard `user' input should be quick.
     87  */
     88 #define	PEVENT	23
     89