Initial commit

[com/gs-lite.git] / include / rdtsc.h

diff --git a/include/rdtsc.h b/include/rdtsc.h
new file mode 100644 (file)
index 0000000..346f5d4
--- /dev/null
+++ b/include/rdtsc.h
@@ -0,0 +1,36 @@
+/* ------------------------------------------------
+ Copyright 2014 AT&T Intellectual Property
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+ 
+ http://www.apache.org/licenses/LICENSE-2.0
+ 
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+ ------------------------------------------- */
+#ifndef __RDTSC_H__
+#define __RDTSC_H__
+
+#include "gsconfig.h"
+#include "gstypes.h"
+
+#if defined(__i386__) || defined(__x86_64__)
+
+static __inline__ gs_uint64_t rdtsc(void)
+{
+    gs_uint64_t x=0;
+    gs_uint32_t low;
+    gs_uint32_t high;
+    __asm__ __volatile__("rdtsc" : "=a" (low), "=d" (high));
+    x=((gs_uint64_t)high)<<32;
+    x=x|((gs_uint64_t)low);
+    return x;
+}
+#endif
+
+#endif // __RDTSC_H__
+