dejanj | bf68e98 | 2013-08-02 15:39:58 +0000 | [diff] [blame^] | 1 | // This file determines MIPS32 features a processor supports. |
| 2 | // |
| 3 | // We return: |
| 4 | // - 0 if the machine matches the asked-for feature. |
| 5 | // - 1 if the machine does not. |
| 6 | // - 2 if the asked-for feature isn't recognised (this will be the case for |
| 7 | // any feature if run on a non-MIPS32 machine). |
| 8 | // - 3 if there was a usage error (it also prints an error message). |
| 9 | #include <stdio.h> |
| 10 | #include <stdlib.h> |
| 11 | #include <string.h> |
| 12 | #include <assert.h> |
| 13 | |
| 14 | #define FEATURE_PRESENT 0 |
| 15 | #define FEATURE_NOT_PRESENT 1 |
| 16 | #define UNRECOGNISED_FEATURE 2 |
| 17 | #define USAGE_ERROR 3 |
| 18 | |
| 19 | #if defined(VGA_mips32) |
| 20 | static int mipsCPUInfo(const char *search_string) { |
| 21 | const char *file_name = "/proc/cpuinfo"; |
| 22 | /* Simple detection of MIPS DSP ASE at runtime for Linux. |
| 23 | * It is based on /proc/cpuinfo, which reveals hardware configuration |
| 24 | * to user-space applications. */ |
| 25 | |
| 26 | char cpuinfo_line[256]; |
| 27 | |
| 28 | FILE *f = NULL; |
| 29 | if ((f = fopen (file_name, "r")) == NULL) |
| 30 | return 0; |
| 31 | |
| 32 | while (fgets (cpuinfo_line, sizeof (cpuinfo_line), f) != NULL) |
| 33 | { |
| 34 | if (strstr (cpuinfo_line, search_string) != NULL) |
| 35 | { |
| 36 | fclose (f); |
| 37 | return 1; |
| 38 | } |
| 39 | } |
| 40 | |
| 41 | fclose (f); |
| 42 | |
| 43 | /* Did not find string in the /proc/cpuinfo file. */ |
| 44 | return 0; |
| 45 | } |
| 46 | |
| 47 | static int go(char *feature) |
| 48 | { |
| 49 | int cpuinfo; |
| 50 | if ( (strcmp(feature, "mips32-dsp") == 0)) { |
| 51 | const char *dsp = "dsp"; |
| 52 | cpuinfo = mipsCPUInfo(dsp); |
| 53 | if (cpuinfo == 1) { |
| 54 | return FEATURE_PRESENT; |
| 55 | } else{ |
| 56 | return FEATURE_NOT_PRESENT; |
| 57 | } |
| 58 | } else if ((strcmp(feature, "mips32-dspr2") == 0)) { |
| 59 | const char *dsp2 = "dsp2"; |
| 60 | cpuinfo = mipsCPUInfo(dsp2); |
| 61 | if (cpuinfo == 1) { |
| 62 | return FEATURE_PRESENT; |
| 63 | } else{ |
| 64 | return FEATURE_NOT_PRESENT; |
| 65 | } |
| 66 | } else { |
| 67 | return UNRECOGNISED_FEATURE; |
| 68 | } |
| 69 | |
| 70 | } |
| 71 | |
| 72 | #else |
| 73 | |
| 74 | static int go(char *feature) |
| 75 | { |
| 76 | /* Feature is not recognised. (non-MIPS32 machine!) */ |
| 77 | return UNRECOGNISED_FEATURE; |
| 78 | } |
| 79 | |
| 80 | #endif |
| 81 | |
| 82 | |
| 83 | //--------------------------------------------------------------------------- |
| 84 | // main |
| 85 | //--------------------------------------------------------------------------- |
| 86 | int main(int argc, char **argv) |
| 87 | { |
| 88 | if (argc != 2) { |
| 89 | fprintf( stderr, "usage: mips32_features <feature>\n" ); |
| 90 | exit(USAGE_ERROR); |
| 91 | } |
| 92 | return go(argv[1]); |
| 93 | } |