/*-
* Copyright (c) 2005-2007, Kohsuke Ohtani
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* dvs.c - test DVS (dynamic voltage scaling).
*/
/*
* This program changes the CPU load periodically. Since the DVS driver
* is polling the CPU load, the driver will change the CPU voltage/freqency
* automatically when CPU becomes idle state.
*
* It is recommended to run CPU voltage monitor 'cpumon' with this program.
*/
#include <prex/prex.h>
#include <stdio.h>
static void
set_0_or_100(void)
{
u_long t1, t2;
char index[] = "-\\|/";
char bar[] = "*\033[1D";
int i, cnt;
i = 0;
for (cnt = 0; cnt < 2; cnt++) {
/*
* Display indicator for 5 sec.
*/
printf("\rCPU Busy:");
sys_time(&t1);
for (;;) {
sys_time(&t2);
if (t2 > t1 + 5000)
break;
/*
* Update indicator per 100 msec.
*/
if ((t2 % 100) == 0) {
bar[0] = index[i++ % 4];
printf(bar);
}
}
/*
* Sleep 5 sec.
*/
printf("\rCPU Idle ");
timer_sleep(5000, 0);
}
}
static void
set_50(void)
{
u_long t1, t2;
char index[] = "-\\|/";
char bar[] = "*\033[1D";
int i, cnt;
printf("\rCPU half speed:");
i = 0;
for (cnt = 0; cnt < 5000; cnt++) {
/*
* Update indicator per 100 msec.
*/
if ((t2 % 100) == 0) {
bar[0] = index[i++ % 4];
printf(bar);
}
sys_time(&t1);
for (;;) {
sys_time(&t2);
if (t2 > t1 + 1)
break;
}
/*
* Sleep 1msec.
*/
timer_sleep(1, 0);
}
}
int
main(int argc, char *argv[])
{
thread_yield();
printf("DVS test program\n");
for (;;) {
set_0_or_100();
set_50();
}
return 0;
}