projects / fio.git / blame
| Commit | Line | Data |
|---|---|---|
| fa80feae JA |
1 | #ifndef FIO_ARCH_X86_COMMON |
| 2 | #define FIO_ARCH_X86_COMMON | |
| 3 | ||
| 4 | static inline void do_cpuid(unsigned int *eax, unsigned int *ebx, | |
| 5 | unsigned int *ecx, unsigned int *edx) | |
| 6 | { | |
| 7 | unsigned int id = *eax; | |
| 8 | ||
| 9 | asm("movl %4, %%eax;" | |
| 10 | "cpuid;" | |
| 11 | "movl %%eax, %0;" | |
| 12 | "movl %%ebx, %1;" | |
| 13 | "movl %%ecx, %2;" | |
| 14 | "movl %%edx, %3;" | |
| 15 | : "=r" (*eax), "=r" (*ebx), "=r" (*ecx), "=r" (*edx) | |
| 16 | : "r" (id) | |
| 17 | : "eax", "ebx", "ecx", "edx"); | |
| 18 | } | |
| 19 | ||
| 20 | #define ARCH_HAVE_INIT | |
| 21 | extern int tsc_reliable; | |
| 22 | static inline int arch_init(char *envp[]) | |
| 23 | { | |
| 24 | unsigned int eax, ebx, ecx, edx; | |
| 25 | ||
| 26 | /* | |
| 27 | * Check for TSC | |
| 28 | */ | |
| 29 | eax = 1; | |
| 30 | do_cpuid(&eax, &ebx, &ecx, &edx); | |
| 31 | if (!(edx & (1U << 4))) | |
| 32 | return 0; | |
| 33 | ||
| 34 | /* | |
| 35 | * Check for constant rate and synced (across cores) TSC | |
| 36 | */ | |
| 37 | eax = 0x80000007; | |
| 38 | do_cpuid(&eax, &ebx, &ecx, &edx); | |
| 39 | tsc_reliable = edx & (1U << 8); | |
| 40 | return 0; | |
| 41 | } | |
| 42 | ||
| 43 | #endif |