1 /* $NetBSD: clock.c,v 1.10 2011/02/08 20:20:19 rmind Exp $ */
2
3 /*
4 * Copyright (c) 1988 University of Utah.
5 * Copyright (c) 1992, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * the Systems Programming Group of the University of Utah Computer
10 * Science Department, Ralph Campbell, and Kazumasa Utashiro of
11 * Software Research Associates, Inc.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 * from: Utah $Hdr: clock.c 1.18 91/01/21$
38 *
39 * @(#)clock.c 8.1 (Berkeley) 6/11/93
40 */
41
42 #include <sys/cdefs.h>
43 __KERNEL_RCSID(0, "$NetBSD: clock.c,v 1.10 2011/02/08 20:20:19 rmind Exp $");
44
45 #include <sys/param.h>
46 #include <sys/kernel.h>
47 #include <sys/device.h>
48 #include <sys/systm.h>
49 #include <dev/clock_subr.h>
50
51 #include <machine/cpu.h>
52 #include <machine/autoconf.h>
53 #include <machine/mainboard.h>
54 #include <machine/sysconf.h>
55
56 #define MINYEAR 1998 /* "today" */
57
58 /*
59 * Machine-dependent clock routines.
60 *
61 * Startrtclock restarts the real-time clock, which provides
62 * hardclock interrupts to kern_clock.c.
63 *
64 * Inittodr initializes the time of day hardware which provides
65 * date functions. Its primary function is to use some file
66 * system information in case the hardare clock lost state.
67 *
68 * Resettodr restores the time of day hardware after a time change.
69 */
70
71 /*
72 * We assume newhz is either stathz or profhz, and that neither will
73 * change after being set up above. Could recalculate intervals here
74 * but that would be a drag.
75 */
76 void
setstatclockrate(int newhz)77 setstatclockrate(int newhz)
78 {
79 }
80
81 /*
82 * Set up the real-time and statistics clocks. Leave stathz 0 only if
83 * no alternative timer is available.
84 */
85 void
cpu_initclocks(void)86 cpu_initclocks(void)
87 {
88 if (platform.clkinit)
89 (*platform.clkinit)();
90 }
91