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      1 /*	$NetBSD: event_var.h,v 1.14 2020/05/24 10:42:28 hannken 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  *	from: @(#)event_var.h	8.1 (Berkeley) 6/11/93
     41  *	from: Hdr: event_var.h,v 1.5 92/11/26 01:11:51 torek Exp  (LBL)
     42  */
     43 
     44 /*
     45  * Internal `Firm_event' interface for the keyboard and mouse drivers.
     46  * The drivers are expected not to place events in the queue above spltty(),
     47  * i.e., are expected to run off serial ports.
     48  */
     49 
     50 /* EV_QSIZE should be a power of two so that `%' is fast */
     51 #define	EV_QSIZE	256	/* may need tuning; this uses 2k */
     52 
     53 struct evvar {
     54 	u_int	ev_get;		/* get (read) index (modified synchronously) */
     55 	volatile u_int ev_put;	/* put (write) index (modified by interrupt) */
     56 	struct	selinfo ev_sel;	/* process selecting */
     57 	struct	proc *ev_io;	/* process that opened queue (can get SIGIO) */
     58 	char	ev_wanted;	/* wake up on input ready */
     59 	char	ev_async;	/* send SIGIO on input ready */
     60 	struct	firm_event *ev_q;/* circular buffer (queue) of events */
     61 };
     62 
     63 #define	splev()	spltty()
     64 
     65 #define	EV_WAKEUP(ev) { \
     66 	selnotify(&(ev)->ev_sel, 0, 0); \
     67 	if ((ev)->ev_wanted) { \
     68 		(ev)->ev_wanted = 0; \
     69 		wakeup((void *)(ev)); \
     70 	} \
     71 	if ((ev)->ev_async) { \
     72 		mutex_enter(&proc_lock); \
     73 		psignal((ev)->ev_io, SIGIO); \
     74 		mutex_exit(&proc_lock); \
     75 	} \
     76 }
     77 
     78 void	ev_init(struct evvar *);
     79 void	ev_fini(struct evvar *);
     80 int	ev_read(struct evvar *, struct uio *, int);
     81 int	ev_poll(struct evvar *, int, struct lwp *);
     82 int	ev_kqfilter(struct evvar *, struct knote *);
     83 
     84 /*
     85  * Hook for 32-bit compatibility on a 64-bit kernel.
     86  */
     87 extern	int (*ev_out32_hook)(struct firm_event *, int, struct uio *);
     88 
     89 /*
     90  * PEVENT is set just above PSOCK, which is just above TTIPRI, on the
     91  * theory that mouse and keyboard `user' input should be quick.
     92  */
     93 #define	PEVENT	23
     94