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event_var.h revision 1.6 
      1  1.6       agc /*	$NetBSD: event_var.h,v 1.6 2003/08/07 16:26:41 agc Exp $	*/
      2  1.2       cgd 
      3  1.1        mw /*
      4  1.1        mw  * Copyright (c) 1992, 1993
      5  1.1        mw  *	The Regents of the University of California.  All rights reserved.
      6  1.1        mw  *
      7  1.1        mw  * This software was developed by the Computer Systems Engineering group
      8  1.1        mw  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
      9  1.1        mw  * contributed to Berkeley.
     10  1.1        mw  *
     11  1.1        mw  * All advertising materials mentioning features or use of this software
     12  1.1        mw  * must display the following acknowledgement:
     13  1.1        mw  *	This product includes software developed by the University of
     14  1.1        mw  *	California, Lawrence Berkeley Laboratory.
     15  1.1        mw  *
     16  1.1        mw  * Redistribution and use in source and binary forms, with or without
     17  1.1        mw  * modification, are permitted provided that the following conditions
     18  1.1        mw  * are met:
     19  1.1        mw  * 1. Redistributions of source code must retain the above copyright
     20  1.1        mw  *    notice, this list of conditions and the following disclaimer.
     21  1.1        mw  * 2. Redistributions in binary form must reproduce the above copyright
     22  1.1        mw  *    notice, this list of conditions and the following disclaimer in the
     23  1.1        mw  *    documentation and/or other materials provided with the distribution.
     24  1.6       agc  * 3. Neither the name of the University nor the names of its contributors
     25  1.1        mw  *    may be used to endorse or promote products derived from this software
     26  1.1        mw  *    without specific prior written permission.
     27  1.1        mw  *
     28  1.1        mw  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     29  1.1        mw  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     30  1.1        mw  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     31  1.1        mw  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     32  1.1        mw  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     33  1.1        mw  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     34  1.1        mw  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     35  1.1        mw  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     36  1.1        mw  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     37  1.1        mw  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     38  1.1        mw  * SUCH DAMAGE.
     39  1.1        mw  *
     40  1.1        mw  *	@(#)event_var.h	8.1 (Berkeley) 6/11/93
     41  1.1        mw  *
     42  1.2       cgd  * Header: event_var.h,v 1.5 92/11/26 01:11:51 torek Exp  (LBL)
     43  1.1        mw  */
     44  1.1        mw 
     45  1.1        mw /*
     46  1.1        mw  * Internal `Firm_event' interface for the keyboard and mouse drivers.
     47  1.1        mw  * The drivers are expected not to place events in the queue above spltty(),
     48  1.1        mw  * i.e., are expected to run off serial ports.
     49  1.1        mw  */
     50  1.1        mw 
     51  1.1        mw /* EV_QSIZE should be a power of two so that `%' is fast */
     52  1.1        mw #define	EV_QSIZE	256	/* may need tuning; this uses 2k */
     53  1.1        mw 
     54  1.1        mw struct evvar {
     55  1.1        mw 	u_int	ev_get;		/* get (read) index (modified synchronously) */
     56  1.1        mw 	volatile u_int ev_put;	/* put (write) index (modified by interrupt) */
     57  1.1        mw 	struct	selinfo ev_sel;	/* process selecting */
     58  1.1        mw 	struct	proc *ev_io;	/* process that opened queue (can get SIGIO) */
     59  1.1        mw 	char	ev_wanted;	/* wake up on input ready */
     60  1.1        mw 	char	ev_async;	/* send SIGIO on input ready */
     61  1.1        mw 	struct	firm_event *ev_q;/* circular buffer (queue) of events */
     62  1.1        mw };
     63  1.1        mw 
     64  1.1        mw #define	splev()	spltty()
     65  1.1        mw 
     66  1.1        mw #define	EV_WAKEUP(ev) { \
     67  1.5  jdolecek 	selnotify(&(ev)->ev_sel, 0); \
     68  1.1        mw 	if ((ev)->ev_wanted) { \
     69  1.1        mw 		(ev)->ev_wanted = 0; \
     70  1.1        mw 		wakeup((caddr_t)(ev)); \
     71  1.1        mw 	} \
     72  1.1        mw 	if ((ev)->ev_async) \
     73  1.1        mw 		psignal((ev)->ev_io, SIGIO); \
     74  1.1        mw }
     75  1.1        mw 
     76  1.4   aymeric void	ev_init(struct evvar *);
     77  1.4   aymeric void	ev_fini(struct evvar *);
     78  1.4   aymeric int	ev_read(struct evvar *, struct uio *, int);
     79  1.4   aymeric int	ev_poll(struct evvar *, int, struct proc *);
     80  1.5  jdolecek int	ev_kqfilter(struct evvar *, struct knote *);
     81  1.1        mw 
     82  1.1        mw /*
     83  1.1        mw  * PEVENT is set just above PSOCK, which is just above TTIPRI, on the
     84  1.1        mw  * theory that mouse and keyboard `user' input should be quick.
     85  1.1        mw  */
     86  1.1        mw #define	PEVENT	23
     87