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authorRichard Henderson <rth@twiddle.net>2014-06-25 14:02:39 -0700
committerRichard Henderson <rth@twiddle.net>2014-07-03 08:38:34 -0700
commit4052993954d1dcb39cbd478ab59e75fe12903e9c (patch)
treeeff00bbf524447661d40cc06bdc848bfe607868e
parent86e1a7ff92df1589a3a0e0dd44ef2d861e307620 (diff)
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aarch64: Add hp-timing.h
-rw-r--r--sysdeps/aarch64/hp-timing.h37
1 files changed, 37 insertions, 0 deletions
diff --git a/sysdeps/aarch64/hp-timing.h b/sysdeps/aarch64/hp-timing.h
new file mode 100644
index 0000000..4267d2c
--- /dev/null
+++ b/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 */