diff options
| author | Haibo Xu <haibo.xu@arm.com> | 2019-04-18 16:20:45 -0700 |
|---|---|---|
| committer | Shentubot <shentubot@google.com> | 2019-04-18 16:22:08 -0700 |
| commit | f4d434c18002c96511decf8ff1ebdbede46ca6a1 (patch) | |
| tree | cc781d877ef0ea64ce33c46d6a30b76eefa4753a /vdso/cycle_clock.h | |
| parent | c931c8e0829914718a729e20d7db0c2bf4e73f0b (diff) | |
Enable vDSO support on arm64.
Signed-off-by: Haibo Xu <haibo.xu@arm.com>
Change-Id: I20103cd6d193431ab7e8120005da1f567b9bc2eb
PiperOrigin-RevId: 244280119
Diffstat (limited to 'vdso/cycle_clock.h')
| -rw-r--r-- | vdso/cycle_clock.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/vdso/cycle_clock.h b/vdso/cycle_clock.h index dfb5b427d..26d6690c0 100644 --- a/vdso/cycle_clock.h +++ b/vdso/cycle_clock.h @@ -33,6 +33,15 @@ static inline uint64_t cycle_clock(void) { asm volatile("rdtsc" : "=a"(lo), "=d"(hi)); return ((uint64_t)hi << 32) | lo; } + +#elif __aarch64__ + +static inline uint64_t cycle_clock(void) { + uint64_t val; + asm volatile("mrs %0, CNTVCT_EL0" : "=r"(val)::"memory"); + return val; +} + #else #error "unsupported architecture" #endif |