2 files changed, 18 insertions, 0 deletions
diff --git a/sys/amd64/include/cpufunc.h b/sys/amd64/include/cpufunc.h
index e50deb01964f..7123e7b8f58a 100644
--- a/sys/amd64/include/cpufunc.h
+++ b/sys/amd64/include/cpufunc.h
@@ -386,6 +386,15 @@ rdtsc(void)
 	return (low | ((uint64_t)high << 32));
 }
 
+static __inline uint64_t
+rdtscp(void)
+{
+	uint32_t low, high;
+
+	__asm __volatile("rdtscp" : "=a" (low), "=d" (high));
+	return (low | ((uint64_t)high << 32));
+}
+
 static __inline uint32_t
 rdtsc32(void)
 {
diff --git a/sys/i386/include/cpufunc.h b/sys/i386/include/cpufunc.h
index 72bf666b3b04..44ba3ff4c4a3 100644
--- a/sys/i386/include/cpufunc.h
+++ b/sys/i386/include/cpufunc.h
@@ -368,6 +368,15 @@ rdtsc(void)
 	return (rv);
 }
 
+static __inline uint64_t
+rdtscp(void)
+{
+	uint64_t rv;
+
+	__asm __volatile("rdtscp" : "=A" (rv));
+	return (rv);
+}
+
 static __inline uint32_t
 rdtsc32(void)
 {