diff options
| author |   Gabriel Ganne <gabriel.ganne@enea.com> | 2017-03-20 15:13:02 +0100 |
|---|---|---|
| committer |   Damjan Marion <dmarion.lists@gmail.com> | 2017-03-21 13:29:20 +0000 |
| commit | 1dc2f9284e5b5eb8b300d63cdb8f74ee36cdecb0 (patch) | |
| tree | d8cf0585250ef1b2f35f380dd41121e20780a149 /src/vppinfra/time.c | |
| parent | eb743fad56b32cb20ad2d2cadc4760f9c25be5e1 (diff) | |
armv8 - fix os_cpu_clock_frequency for armv8
System timer of ARMv8 runs at a different frequency than the CPU's.
The frequency is fixed, typically in the range 1-50MHz. It can be
read at CNTFRQ special register.
Change-Id: I6a21a6a9e2df783559df0caec63d5525c2258227
Signed-off-by: Gabriel Ganne <gabriel.ganne@enea.com>
Diffstat (limited to 'src/vppinfra/time.c')
| -rw-r--r-- | src/vppinfra/time.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/vppinfra/time.c b/src/vppinfra/time.c index 2bdb9da4b39..168d7375915 100644 --- a/src/vppinfra/time.c +++ b/src/vppinfra/time.c @@ -147,6 +147,12 @@ os_cpu_clock_frequency (void) if (clib_cpu_supports_invariant_tsc ()) return estimate_clock_frequency (1e-3); +#if defined (__aarch64__) + u64 tsc; + asm volatile ("mrs %0, CNTFRQ_EL0":"=r" (tsc)); + return (f64) tsc; +#endif + /* First try /sys version. */ cpu_freq = clock_frequency_from_sys_filesystem (); if (cpu_freq != 0) |