Annotation of prex/usr/test/dvs/dvs.c, Revision 1.1.1.1
1.1 nbrk 1: /*-
2: * Copyright (c) 2005-2007, Kohsuke Ohtani
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * 3. Neither the name of the author nor the names of any co-contributors
14: * may be used to endorse or promote products derived from this software
15: * without specific prior written permission.
16: *
17: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27: * SUCH DAMAGE.
28: */
29:
30: /*
31: * dvs.c - test DVS (dynamic voltage scaling).
32: */
33:
34: /*
35: * This program changes the CPU load periodically. Since the DVS driver
36: * is polling the CPU load, the driver will change the CPU voltage/freqency
37: * automatically when CPU becomes idle state.
38: *
39: * It is recommended to run CPU voltage monitor 'cpumon' with this program.
40: */
41:
42: #include <prex/prex.h>
43: #include <stdio.h>
44:
45: static void
46: set_0_or_100(void)
47: {
48: u_long t1, t2;
49: char index[] = "-\\|/";
50: char bar[] = "*\033[1D";
51: int i, cnt;
52:
53: i = 0;
54: for (cnt = 0; cnt < 2; cnt++) {
55: /*
56: * Display indicator for 5 sec.
57: */
58: printf("\rCPU Busy:");
59: sys_time(&t1);
60: for (;;) {
61: sys_time(&t2);
62: if (t2 > t1 + 5000)
63: break;
64: /*
65: * Update indicator per 100 msec.
66: */
67: if ((t2 % 100) == 0) {
68: bar[0] = index[i++ % 4];
69: printf(bar);
70: }
71: }
72: /*
73: * Sleep 5 sec.
74: */
75: printf("\rCPU Idle ");
76: timer_sleep(5000, 0);
77: }
78: }
79:
80: static void
81: set_50(void)
82: {
83: u_long t1, t2;
84: char index[] = "-\\|/";
85: char bar[] = "*\033[1D";
86: int i, cnt;
87:
88: printf("\rCPU half speed:");
89: i = 0;
90: for (cnt = 0; cnt < 5000; cnt++) {
91: /*
92: * Update indicator per 100 msec.
93: */
94: if ((t2 % 100) == 0) {
95: bar[0] = index[i++ % 4];
96: printf(bar);
97: }
98: sys_time(&t1);
99: for (;;) {
100: sys_time(&t2);
101: if (t2 > t1 + 1)
102: break;
103: }
104: /*
105: * Sleep 1msec.
106: */
107: timer_sleep(1, 0);
108: }
109: }
110:
111: int
112: main(int argc, char *argv[])
113: {
114: thread_yield();
115:
116: printf("DVS test program\n");
117:
118: for (;;) {
119: set_0_or_100();
120: set_50();
121: }
122: return 0;
123: }
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