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