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