release/src/router/dnscrypt/src/libnacl/cpucycles/x86cpuspeed.c

   1 #include <stdio.h>
   2 #include <sys/types.h>
   3 #include <sys/param.h>
   4 #include <sys/sysctl.h>
   5
   6 long long cpucycles_x86cpuspeed(void)
   7 {
   8   long long result;
   9   asm volatile(".byte 15;.byte 49" : "=A" (result));
  10   return result;
  11 }
  12
  13 long long cpucycles_x86cpuspeed_persecond(void)
  14 {
  15   int oid[2];
  16   int val;
  17   size_t size;
  18   oid[0] = CTL_HW;
  19   oid[1] = HW_CPUSPEED;
  20   size = sizeof val;
  21   if (sysctl(oid,2,&val,&size,0,0) == -1) return 0;
  22   if (size != sizeof val) return 0;
  23   return val * 1000000LL;
  24 }