1 /* $NetBSD: clock.c,v 1.9 2013/01/26 15:46:24 tsutsui 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 and Ralph Campbell.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * from: Utah Hdr: clock.c 1.18 91/01/21
37 *
38 * @(#)clock.c 8.1 (Berkeley) 6/10/93
39 */
40
41 #include <sys/cdefs.h>
42 __KERNEL_RCSID(0, "$NetBSD: clock.c,v 1.9 2013/01/26 15:46:24 tsutsui Exp $");
43
44 #include <sys/param.h>
45 #include <sys/systm.h>
46 #include <sys/device.h>
47 #include <sys/kernel.h>
48
49 #include <machine/cpu.h>
50
51 #include <dev/clock_subr.h>
52
53 /*
54 * Machine-dependent clock routines.
55 *
56 * Startrtclock restarts the real-time clock, which provides
57 * hardclock interrupts to kern_clock.c.
58 *
59 */
60
61 int clock_enable; /* XXX to be removed XXX */
62
63 /*
64 * Start the real-time and statistics clocks. Leave stathz 0 since there
65 * are no other timers available.
66 */
67 void
cpu_initclocks(void)68 cpu_initclocks(void)
69 {
70 int s;
71
72 if (machtype == LUNA_I)
73 hz = 60; /* LUNA-I is clocked at 60Hz, not 100Hz */
74
75 tick = 1000000 / hz; /* number of microseconds between interrupts */
76
77 /*
78 * Get the clock started.
79 */
80 s = splhigh();
81 /*
82 * XXX
83 * I guess it's necessary to program clock source with
84 * approprivate mode/value.
85 * XXX
86 */
87 clock_enable = 1;
88 splx(s);
89 }
90
91 /*
92 * We assume newhz is either stathz or profhz, and that neither will
93 * change after being set up above. Could recalculate intervals here
94 * but that would be a drag.
95 */
96 void
setstatclockrate(int newhz)97 setstatclockrate(int newhz)
98 {
99 /* nothing we can do */
100 }
101