diff options
Diffstat (limited to 'sys/dev/sun/event.c')
| -rw-r--r-- | sys/dev/sun/event.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/sys/dev/sun/event.c b/sys/dev/sun/event.c new file mode 100644 index 00000000000..08463379d68 --- /dev/null +++ b/sys/dev/sun/event.c @@ -0,0 +1,171 @@ +/* $NetBSD: event.c,v 1.1.1.1 1996/01/24 01:15:34 gwr Exp $ */ + +/* + * Copyright (c) 1992, 1993 + * The Regents of the University of California. All rights reserved. + * + * This software was developed by the Computer Systems Engineering group + * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and + * contributed to Berkeley. + * + * All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Lawrence Berkeley Laboratory. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)event.c 8.1 (Berkeley) 6/11/93 + */ + +/* + * Internal `Firm_event' interface for the keyboard and mouse drivers. + */ + +#include <sys/param.h> +#include <sys/fcntl.h> +#include <sys/malloc.h> +#include <sys/proc.h> +#include <sys/systm.h> +#include <sys/vnode.h> + +#include <machine/vuid_event.h> +#include "event_var.h" + +/* + * Initialize a firm_event queue. + */ +void +ev_init(ev) + register struct evvar *ev; +{ + + ev->ev_get = ev->ev_put = 0; + ev->ev_q = malloc((u_long)EV_QSIZE * sizeof(struct firm_event), + M_DEVBUF, M_WAITOK); + bzero((caddr_t)ev->ev_q, EV_QSIZE * sizeof(struct firm_event)); +} + +/* + * Tear down a firm_event queue. + */ +void +ev_fini(ev) + register struct evvar *ev; +{ + + free(ev->ev_q, M_DEVBUF); +} + +/* + * User-level interface: read, select. + * (User cannot write an event queue.) + */ +int +ev_read(ev, uio, flags) + register struct evvar *ev; + struct uio *uio; + int flags; +{ + int s, n, cnt, error; + + /* + * Make sure we can return at least 1. + */ + if (uio->uio_resid < sizeof(struct firm_event)) + return (EMSGSIZE); /* ??? */ + s = splev(); + while (ev->ev_get == ev->ev_put) { + if (flags & IO_NDELAY) { + splx(s); + return (EWOULDBLOCK); + } + ev->ev_wanted = 1; + error = tsleep((caddr_t)ev, PEVENT | PCATCH, "firm_event", 0); + if (error) { + splx(s); + return (error); + } + } + /* + * Move firm_events from tail end of queue (there is at least one + * there). + */ + if (ev->ev_put < ev->ev_get) + cnt = EV_QSIZE - ev->ev_get; /* events in [get..QSIZE) */ + else + cnt = ev->ev_put - ev->ev_get; /* events in [get..put) */ + splx(s); + n = howmany(uio->uio_resid, sizeof(struct firm_event)); + if (cnt > n) + cnt = n; + error = uiomove((caddr_t)&ev->ev_q[ev->ev_get], + cnt * sizeof(struct firm_event), uio); + n -= cnt; + /* + * If we do not wrap to 0, used up all our space, or had an error, + * stop. Otherwise move from front of queue to put index, if there + * is anything there to move. + */ + if ((ev->ev_get = (ev->ev_get + cnt) % EV_QSIZE) != 0 || + n == 0 || error || (cnt = ev->ev_put) == 0) + return (error); + if (cnt > n) + cnt = n; + error = uiomove((caddr_t)&ev->ev_q[0], + cnt * sizeof(struct firm_event), uio); + ev->ev_get = cnt; + return (error); +} + +int +ev_select(ev, rw, p) + register struct evvar *ev; + int rw; + struct proc *p; +{ + int s = splev(); + + switch (rw) { + + case FREAD: + /* succeed if there is something to read */ + if (ev->ev_get != ev->ev_put) { + splx(s); + return (1); + } + selrecord(p, &ev->ev_sel); + break; + + case FWRITE: + return (1); /* always fails => never blocks */ + } + splx(s); + return (0); +} |