Annotation of prex/usr/test/dvs/dvs.c, Revision 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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