init gnumach copy

1 files changed, 109 insertions, 0 deletions

diff --git a/i386/i386at/kd_queue.c b/i386/i386at/kd_queue.c
new file mode 100644
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--- /dev/null
+++ b/i386/i386at/kd_queue.c
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+/* 
+ * Mach Operating System
+ * Copyright (c) 1991,1990,1989 Carnegie Mellon University
+ * All Rights Reserved.
+ * 
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ * 
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ * 
+ * Carnegie Mellon requests users of this software to return to
+ * 
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ * 
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+/* **********************************************************************
+ File:         kd_queue.c
+ Description:  Event queue code for keyboard/display (and mouse) driver.
+
+ $ Header: $
+
+ Copyright Ing. C. Olivetti & C. S.p.A. 1989.
+ All rights reserved.
+********************************************************************** */
+/*
+  Copyright 1988, 1989 by Olivetti Advanced Technology Center, Inc.,
+Cupertino, California.
+
+		All Rights Reserved
+
+  Permission to use, copy, modify, and distribute this software and
+its documentation for any purpose and without fee is hereby
+granted, provided that the above copyright notice appears in all
+copies and that both the copyright notice and this permission notice
+appear in supporting documentation, and that the name of Olivetti
+not be used in advertising or publicity pertaining to distribution
+of the software without specific, written prior permission.
+
+  OLIVETTI DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
+INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
+IN NO EVENT SHALL OLIVETTI BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
+CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
+NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUR OF OR IN CONNECTION
+WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+
+#include <i386at/kd_queue.h>
+
+/*
+ * Notice that when adding an entry to the queue, the caller provides 
+ * its own storage, which is copied into the queue.  However, when 
+ * removing an entry from the queue, the caller is given a pointer to a 
+ * queue element.  This means that the caller must either process the 
+ * element or copy it into its own storage before unlocking the queue.
+ *
+ * These routines should be called only at a protected SPL.
+ */
+
+#define q_next(index)	(((index)+1) % KDQSIZE)
+
+boolean_t
+kdq_empty(const kd_event_queue *q)
+{
+	return(q->firstfree == q->firstout);
+}
+
+boolean_t
+kdq_full(const kd_event_queue *q)
+{
+	return(q_next(q->firstfree) == q->firstout);
+}
+
+void
+kdq_put(kd_event_queue *q, kd_event *ev)
+{
+	kd_event *qp = q->events + q->firstfree;
+
+	qp->type = ev->type;
+	qp->unused_time = ev->unused_time;
+	qp->value = ev->value;
+	q->firstfree = q_next(q->firstfree);
+}
+
+kd_event *
+kdq_get(kd_event_queue *q)
+{
+	kd_event *result = q->events + q->firstout;
+
+	q->firstout = q_next(q->firstout);
+	return(result);
+}
+
+void
+kdq_reset(kd_event_queue *q)
+{
+	q->firstout = q->firstfree = 0;
+}