| 1 | /* |
| 2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; only version 2 |
| 7 | * of the License. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 17 | */ |
| 18 | |
| 19 | #include <stdio.h> |
| 20 | #include <string.h> |
| 21 | #include <sys/time.h> |
| 22 | #include <unistd.h> |
| 23 | |
| 24 | #include "cpu.h" |
| 25 | |
| 26 | /* |
| 27 | * Return cpu cycle counter |
| 28 | */ |
| 29 | cycles_t get_cycles(void) |
| 30 | { |
| 31 | return caa_get_cycles(); |
| 32 | } |
| 33 | |
| 34 | /* |
| 35 | * Calculate CPU frequency. |
| 36 | */ |
| 37 | uint64_t get_cpu_freq(void) |
| 38 | { |
| 39 | struct timezone tz; |
| 40 | struct timeval tvstart, tvstop; |
| 41 | cycles_t c_before, c_after; |
| 42 | unsigned long microseconds; |
| 43 | |
| 44 | memset(&tz, 0, sizeof(tz)); |
| 45 | |
| 46 | gettimeofday(&tvstart, &tz); |
| 47 | c_before = get_cycles(); |
| 48 | gettimeofday(&tvstart, &tz); |
| 49 | |
| 50 | sleep(1); |
| 51 | |
| 52 | gettimeofday(&tvstop, &tz); |
| 53 | c_after = get_cycles(); |
| 54 | gettimeofday(&tvstop, &tz); |
| 55 | |
| 56 | microseconds = ((tvstop.tv_sec - tvstart.tv_sec) * 1000000) + |
| 57 | (tvstop.tv_usec - tvstart.tv_usec); |
| 58 | |
| 59 | return (uint64_t) ((c_after - c_before) / microseconds); |
| 60 | } |