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Linux/tools/perf/util/tsc.c

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  1 #include <linux/compiler.h>
  2 #include <linux/types.h>
  3 
  4 #include "tsc.h"
  5 
  6 u64 perf_time_to_tsc(u64 ns, struct perf_tsc_conversion *tc)
  7 {
  8         u64 t, quot, rem;
  9 
 10         t = ns - tc->time_zero;
 11         quot = t / tc->time_mult;
 12         rem  = t % tc->time_mult;
 13         return (quot << tc->time_shift) +
 14                (rem << tc->time_shift) / tc->time_mult;
 15 }
 16 
 17 u64 tsc_to_perf_time(u64 cyc, struct perf_tsc_conversion *tc)
 18 {
 19         u64 quot, rem;
 20 
 21         quot = cyc >> tc->time_shift;
 22         rem  = cyc & (((u64)1 << tc->time_shift) - 1);
 23         return tc->time_zero + quot * tc->time_mult +
 24                ((rem * tc->time_mult) >> tc->time_shift);
 25 }
 26 
 27 u64 __weak rdtsc(void)
 28 {
 29         return 0;
 30 }
 31 

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