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

   1 #include <sys/types.h>
   2 #include <sys/param.h>
   3 #include <sys/sysctl.h>
   4 #include <mach/mach_time.h>
   5
   6 #define timebase mach_absolute_time
   7
   8 static int cpumib[2] = { CTL_HW, HW_CPU_FREQ } ;
   9 static int tbmib[2] = { CTL_HW, HW_TB_FREQ } ;
  10
  11 static long myround(double u)
  12 {
  13   long result = u;
  14   while (result + 0.5 < u) result += 1;
  15   while (result - 0.5 > u) result -= 1;
  16   return result;
  17 }
  18
  19 static long tbcycles = 0;
  20
  21 static void init(void)
  22 {
  23   unsigned int cpufrequency = 0; size_t cpufrequencylen = sizeof(unsigned int);
  24   unsigned int tbfrequency = 0; size_t tbfrequencylen = sizeof(unsigned int);
  25   sysctl(cpumib,2,&cpufrequency,&cpufrequencylen,0,0);
  26   sysctl(tbmib,2,&tbfrequency,&tbfrequencylen,0,0);
  27   if (tbfrequency > 0)
  28     tbcycles = myround((double) (unsigned long long) cpufrequency
  29                      / (double) (unsigned long long) tbfrequency);
  30 }
  31
  32 long long cpucycles_powerpcmacos(void)
  33 {
  34   if (!tbcycles) init();
  35   return timebase() * tbcycles;
  36 }
  37
  38 long long cpucycles_powerpcmacos_persecond(void)
  39 {
  40   unsigned int result = 0; size_t resultlen = sizeof(unsigned int);
  41   sysctl(cpumib,2,&result,&resultlen,0,0);
  42   return (unsigned long long) result;
  43 }