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      1 /*	$NetBSD: event_var.h,v 1.10 2014/03/21 16:58:54 tsutsui 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 
     43 /*
     44  * Internal `Firm_event' interface for the keyboard and mouse drivers.
     45  * The drivers are expected not to place events in the queue above spltty(),
     46  * i.e., are expected to run off serial ports.
     47  */
     48 
     49 /* EV_QSIZE should be a power of two so that `%' is fast */
     50 #define	EV_QSIZE	256	/* may need tuning; this uses 2k */
     51 
     52 struct evvar {
     53 	u_int	ev_get;		/* get (read) index (modified synchronously) */
     54 	volatile u_int ev_put;	/* put (write) index (modified by interrupt) */
     55 	struct	selinfo ev_sel;	/* process selecting */
     56 	struct	proc *ev_io;	/* process that opened queue (can get SIGIO) */
     57 	bool	ev_wanted;	/* wake up on input ready */
     58 	bool	ev_async;	/* send SIGIO on input ready */
     59 	struct	firm_event *ev_q;/* circular buffer (queue) of events */
     60 	kmutex_t *ev_lock;	/* lock from the parent device */
     61 	kcondvar_t ev_cv;	/* condvar(9) to delever signal */
     62 };
     63 
     64 void	ev_init(struct evvar *, const char *, kmutex_t *);
     65 void	ev_fini(struct evvar *);
     66 int	ev_read(struct evvar *, struct uio *, int);
     67 int	ev_select(struct evvar *, int, struct lwp *);
     68 int	ev_poll(struct evvar *, int, struct lwp *);
     69 void	ev_wakeup(struct evvar *);
     70 int	ev_kqfilter(struct evvar *, struct knote *);
     71 
     72 /*
     73  * PEVENT is set just above PSOCK, which is just above TTIPRI, on the
     74  * theory that mouse and keyboard `user' input should be quick.
     75  */
     76 #define	PEVENT	23
     77