sync to 0616, retaining local diffs

1 files changed, 172 insertions, 0 deletions

diff --git a/sys/dev/wscons/event.c b/sys/dev/wscons/event.c
new file mode 100644
index 00000000000..3c34d962c83
--- /dev/null
+++ b/sys/dev/wscons/event.c
@@ -0,0 +1,172 @@
+/*	$NetBSD: event.c,v 1.1.4.1 1996/05/29 22:26:54 cgd 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 <alpha/wscons/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:
+		splx(s);
+		return (1);	/* always fails => never blocks */
+	}
+	splx(s);
+	return (0);
+}