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Annotation of prex-old/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: }