aarch64: Add hp-timing.h

sysdeps/aarch64/hp-timing.h

@@ -0,0 +1,37 @@
+/* High precision, low overhead timing functions.  AArch64 version.
+   Copyright (C) 2014 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _HP_TIMING_H
+#define _HP_TIMING_H	1
+
+/* We always assume having the cycle counter register.  */
+#define HP_TIMING_AVAIL		(1)
+
+/* We indeed have inlined functions.  */
+#define HP_TIMING_INLINE	(1)
+
+/* We use 64bit values for the times.  */
+typedef unsigned long long int hp_timing_t;
+
+/* Sync the instruction stream, and read from the virtual cycle counter.  */
+#define HP_TIMING_NOW(Var) \
+  __asm__ __volatile__ ("isb; mrs %0, cntvct_el0" : "=r" (Var))
+
+#include <hp-timing-common.h>
+
+#endif	/* hp-timing.h */