The Android Open Source Project | 10e23ee | 2009-03-03 19:30:30 -0800 | [diff] [blame] | 1 | /** |
| 2 | * @file op_cpufreq.c |
| 3 | * get cpu frequency definition |
| 4 | * |
| 5 | * @remark Copyright 2003 OProfile authors |
| 6 | * @remark Read the file COPYING |
| 7 | * |
| 8 | * @author John Levon |
| 9 | * @author Philippe Elie |
| 10 | */ |
| 11 | |
| 12 | #include <stdio.h> |
| 13 | #include <stdlib.h> |
| 14 | |
| 15 | #include "op_fileio.h" |
| 16 | |
| 17 | double op_cpu_frequency(void) |
| 18 | { |
| 19 | double fval = 0.0; |
| 20 | unsigned long uval; |
| 21 | char * line = NULL; |
| 22 | |
| 23 | FILE * fp = op_try_open_file("/proc/cpuinfo", "r"); |
| 24 | if (!fp) |
| 25 | return 0.0; |
| 26 | |
| 27 | while (1) { |
| 28 | line = op_get_line(fp); |
| 29 | |
| 30 | if (!line) |
| 31 | break; |
| 32 | |
| 33 | if (line[0] == '\0') { |
| 34 | free(line); |
| 35 | continue; |
| 36 | } |
| 37 | |
| 38 | /* x86/parisc/ia64/x86_64 */ |
| 39 | if (sscanf(line, "cpu MHz : %lf", &fval) == 1) |
| 40 | break; |
| 41 | /* ppc/ppc64 */ |
| 42 | if (sscanf(line, "clock : %lfMHz", &fval) == 1) |
| 43 | break; |
| 44 | /* alpha */ |
| 45 | if (sscanf(line, "cycle frequency [Hz] : %lu", &uval) == 1) { |
| 46 | fval = uval / 1E6; |
| 47 | break; |
| 48 | } |
| 49 | /* sparc64 if CONFIG_SMP only */ |
| 50 | if (sscanf(line, "Cpu0ClkTck : %lx", &uval) == 1) { |
| 51 | fval = uval / 1E6; |
| 52 | break; |
| 53 | } |
The Android Open Source Project | 10e23ee | 2009-03-03 19:30:30 -0800 | [diff] [blame] | 54 | /* s390 doesn't provide cpu freq, checked up to 2.6-test4 */ |
| 55 | |
| 56 | free(line); |
| 57 | } |
| 58 | |
| 59 | if (line) |
| 60 | free(line); |
| 61 | op_close_file(fp); |
| 62 | |
| 63 | return fval; |
| 64 | } |