1 files changed, 17 insertions, 0 deletions

diff --git a/nacl/cpucycles/x86tscfreq.c b/nacl/cpucycles/x86tscfreq.c
new file mode 100644
index 00000000..a1b94b62
--- /dev/null
+++ b/nacl/cpucycles/x86tscfreq.c
@@ -0,0 +1,17 @@
+#include <sys/types.h>
+#include <sys/sysctl.h>
+
+long long cpucycles_x86tscfreq(void)
+{
+  long long result;
+  asm volatile(".byte 15;.byte 49" : "=A" (result));
+  return result;
+}
+
+long long cpucycles_x86tscfreq_persecond(void)
+{
+  long result = 0;
+  size_t resultlen = sizeof(long);
+  sysctlbyname("machdep.tsc_freq",&result,&resultlen,0,0);
+  return result;
+}