1 files changed, 42 insertions, 0 deletions

diff --git a/nacl/cpucycles/powerpcmacos.c b/nacl/cpucycles/powerpcmacos.c
new file mode 100644
index 00000000..ab0be1ea
--- /dev/null
+++ b/nacl/cpucycles/powerpcmacos.c
@@ -0,0 +1,42 @@
+#include <sys/types.h>
+#include <sys/sysctl.h>
+#include <mach/mach_time.h>
+
+#define timebase mach_absolute_time
+
+static int cpumib[2] = { CTL_HW, HW_CPU_FREQ } ;
+static int tbmib[2] = { CTL_HW, HW_TB_FREQ } ;
+
+static long myround(double u)
+{
+  long result = u;
+  while (result + 0.5 < u) result += 1;
+  while (result - 0.5 > u) result -= 1;
+  return result;
+}
+
+static long tbcycles = 0;
+
+static void init(void)
+{
+  unsigned int cpufrequency = 0; size_t cpufrequencylen = sizeof(unsigned int);
+  unsigned int tbfrequency = 0; size_t tbfrequencylen = sizeof(unsigned int);
+  sysctl(cpumib,2,&cpufrequency,&cpufrequencylen,0,0);
+  sysctl(tbmib,2,&tbfrequency,&tbfrequencylen,0,0);
+  if (tbfrequency > 0)
+    tbcycles = myround((double) (unsigned long long) cpufrequency
+                     / (double) (unsigned long long) tbfrequency);
+}
+
+long long cpucycles_powerpcmacos(void)
+{
+  if (!tbcycles) init();
+  return timebase() * tbcycles;
+}
+
+long long cpucycles_powerpcmacos_persecond(void)
+{
+  unsigned int result = 0; size_t resultlen = sizeof(unsigned int);
+  sysctl(cpumib,2,&result,&resultlen,0,0);
+  return (unsigned long long) result;
+}