1 files changed, 24 insertions, 0 deletions

diff --git a/nacl/cpucycles/x86cpuspeed.c b/nacl/cpucycles/x86cpuspeed.c
new file mode 100644
index 00000000..34222565
--- /dev/null
+++ b/nacl/cpucycles/x86cpuspeed.c
@@ -0,0 +1,24 @@
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/sysctl.h>
+
+long long cpucycles_x86cpuspeed(void)
+{
+  long long result;
+  asm volatile(".byte 15;.byte 49" : "=A" (result));
+  return result;
+}
+
+long long cpucycles_x86cpuspeed_persecond(void)
+{
+  int oid[2];
+  int val;
+  size_t size;
+  oid[0] = CTL_HW;
+  oid[1] = HW_CPUSPEED;
+  size = sizeof val;
+  if (sysctl(oid,2,&val,&size,0,0) == -1) return 0;
+  if (size != sizeof val) return 0;
+  return val * 1000000LL;
+}