1 /* $NetBSD: clock.c,v 1.7 2020/05/29 12:30:40 rin Exp $ */
2
3 /*
4 * Copyright (c) 2006 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 *
8 * Author:
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 /* Comments about functions from alpha/clock.c */
33
34 #include <sys/cdefs.h>
35
36 #include <sys/param.h>
37 #include <sys/kernel.h>
38 #include <sys/systm.h>
39 #include <sys/timetc.h>
40
41 #include <machine/clock.h>
42 #include <machine/cpu.h>
43 #include <machine/ia64_cpu.h>
44
45
46 uint64_t ia64_clock_reload;
47
48
49 #if !defined(MULTIPROCESSOR)
50 static unsigned
ia64_get_timecount(struct timecounter * tc)51 ia64_get_timecount(struct timecounter* tc)
52 {
53
54 return ia64_get_itc();
55 }
56 #endif
57
58 void
pcpu_initclock(void)59 pcpu_initclock(void)
60 {
61 struct cpu_info *ci = curcpu();
62
63 ci->ci_clockadj = 0;
64 ci->ci_clock = ia64_get_itc();
65 ia64_set_itm(ci->ci_clock + ia64_clock_reload);
66 #if 0
67 ia64_set_itv(CLOCK_VECTOR); /* highest priority class */
68 #endif
69 ia64_srlz_d();
70 }
71
72 /*
73 * Start the real-time and statistics clocks. We use cr.itc and cr.itm
74 * to implement a 1000hz clock.
75 */
76 void
cpu_initclocks(void)77 cpu_initclocks(void)
78 {
79 #if !defined(MULTIPROCESSOR)
80 static struct timecounter tc = {
81 .tc_get_timecount = ia64_get_timecount,
82 .tc_counter_mask = ~0u,
83 .tc_name = "ia64_timecounter",
84 .tc_quality = 100,
85 };
86 #endif
87
88 if (itc_frequency == 0)
89 panic("Unknown clock frequency");
90
91 stathz = hz;
92 ia64_clock_reload = (itc_frequency + hz / 2) / hz;
93
94 #if !defined(MULTIPROCESSOR)
95 tc.tc_frequency = itc_frequency;
96 tc_init(&tc);
97 #endif
98
99 pcpu_initclock();
100 }
101
102 void
setstatclockrate(int newhz)103 setstatclockrate(int newhz)
104 {
105
106 /* nothing to do? */
107 }
108