diff options
Diffstat (limited to 'runtime/time.c')
| -rw-r--r-- | runtime/time.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/runtime/time.c b/runtime/time.c index 058cfe49..8d82f3d1 100644 --- a/runtime/time.c +++ b/runtime/time.c @@ -58,6 +58,12 @@ void *stp_time = NULL; static unsigned int __stp_estimate_cpufreq(void) { +#if defined (__s390__) || defined (__s390x__) + // We don't need to find the cpu freq on s390 as the + // TOD clock is always a fix freq. (see: POO pg 4-36.) + return 0; +#else /* __s390x__ || __s390x__ */ + cycles_t beg, mid, end; beg = get_cycles(); barrier(); udelay(1); barrier(); @@ -65,6 +71,7 @@ __stp_estimate_cpufreq(void) udelay(1001); barrier(); end = get_cycles(); barrier(); return (beg - 2*mid + end); +#endif } static void @@ -230,10 +237,20 @@ _stp_gettimeofday_ns(void) preempt_enable(); +#if defined (__s390__) || defined (__s390x__) + // The TOD clock on the s390 (read by get_cycles() ) + // is converted to a nano-second value using the following: + // (get_cycles() * 125) >> 7; + + delta = (delta * 125) >> 7; + +#else /* __s390__ || __s390x__ */ + // Verify units: // (D cycles) * (1E6 ns/ms) / (F cycles/ms [kHz]) = ns delta *= NSEC_PER_MSEC; do_div(delta, freq); +#endif + return base + delta; } - |