Initial Spring 2016 commit.

2015-12-23 00:50:04 +00:00
commit cafa9f5690
732 changed files with 92195 additions and 0 deletions
--- a/kern/include/clock.h
+++ b/kern/include/clock.h
@@ -0,0 +1,83 @@
+/*
+ * Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009
+ *	The President and Fellows of Harvard College.
+ *
+ * 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. 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 UNIVERSITY 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 UNIVERSITY 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.
+ */
+
+#ifndef _CLOCK_H_
+#define _CLOCK_H_
+
+/*
+ * Time-related definitions.
+ */
+
+#include <kern/time.h>
+
+
+/*
+ * hardclock() is called on every CPU HZ times a second, possibly only
+ * when the CPU is not idle, for scheduling.
+ */
+
+/* hardclocks per second */
+#define HZ  100
+
+void hardclock_bootstrap(void);
+void hardclock(void);
+
+/*
+ * timerclock() is called on one CPU once a second to allow simple
+ * timed operations. (This is a fairly simpleminded interface.)
+ */
+void timerclock(void);
+
+/*
+ * gettime() may be used to fetch the current time of day.
+ */
+void gettime(struct timespec *ret);
+
+/*
+ * arithmetic on times
+ *
+ * add: ret = t1 + t2
+ * sub: ret = t1 - t2
+ */
+
+void timespec_add(const struct timespec *t1,
+		  const struct timespec *t2,
+		  struct timespec *ret);
+void timespec_sub(const struct timespec *t1,
+		  const struct timespec *t2,
+		  struct timespec *ret);
+
+/*
+ * clocksleep() suspends execution for the requested number of seconds,
+ * like userlevel sleep(3). (Don't confuse it with wchan_sleep.)
+ */
+void clocksleep(int seconds);
+
+
+#endif /* _CLOCK_H_ */