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Implement ottd_rdtsc for AARCH64 on GCC/clang

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Jonathan G Rennison
2022-01-31 02:50:27 +00:00
parent ed80a39b30
commit a7bcb7e62d
1 changed files with 11 additions and 0 deletions
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11
src/cpu.cpp
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@@ -50,6 +50,17 @@ uint64 ottd_rdtsc()
# define RDTSC_AVAILABLE # define RDTSC_AVAILABLE
#endif #endif
/* rdtsc for AARCH64. Use GCC syntax */
#if defined(__aarch64__) && !defined(RDTSC_AVAILABLE)
uint64 ottd_rdtsc()
{
uint64 val;
asm volatile("mrs %0, cntvct_el0" : "=r" (val));
return val;
}
# define RDTSC_AVAILABLE
#endif
/* rdtsc for PPC which has this not */ /* rdtsc for PPC which has this not */
#if (defined(__POWERPC__) || defined(__powerpc__)) && !defined(RDTSC_AVAILABLE) #if (defined(__POWERPC__) || defined(__powerpc__)) && !defined(RDTSC_AVAILABLE)
uint64 ottd_rdtsc() uint64 ottd_rdtsc()