diff mbox series

[1/2] MIPS: add hp-timing support for MIPS R2

Message ID 20201030021437.24001-1-huangpei@loongson.cn
State Superseded
Headers
Series [1/2] MIPS: add hp-timing support for MIPS R2 |

Commit Message

Huang Pei Oct. 30, 2020, 2:14 a.m. UTC 
  MIPS R2 only support 32 bit TSC(AKA "rdhwr %0, $2"), but for should be
enough for glibc

Signed-off-by: Huang Pei <huangpei@loongson.cn>
---
 sysdeps/mips/hp-timing.h | 43 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 sysdeps/mips/hp-timing.h

Comments

Joseph Myers Oct. 30, 2020, 5:02 p.m. UTC | #1 
On Fri, 30 Oct 2020, Huang Pei wrote:

> +#if __mips_isa_rev => 2

How was this patch tested?  C syntax is >=, not =>.
Huang Pei Oct. 31, 2020, 3:32 a.m. UTC | #2 
Sorry, this one is not test, the tested patches are these two
---------------------------------------------------------------------------

From c6982455c5db25aa1d022f9dad67366c58c71aab Mon Sep 17 00:00:00 2001
From: Chenghua Xu <xuchenghua@loongson.cn>
Date: Sat, 10 Oct 2020 10:00:16 +0800
Subject: [PATCH] [MIPS] add support HP_TIMING.

---
 sysdeps/mips/hp-timing.h | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 sysdeps/mips/hp-timing.h

diff --git a/sysdeps/mips/hp-timing.h b/sysdeps/mips/hp-timing.h
new file mode 100644
index 00000000..505fbe61
--- /dev/null
+++ b/sysdeps/mips/hp-timing.h
@@ -0,0 +1,40 @@
+/* High precision, low overhead timing functions.  x86-64 version.
+   Copyright (C) 2002-2018 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 timestamp register.  */
+#define HP_TIMING_AVAIL		(1)
+#define HP_SMALL_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;
+
+/* Read the cp0 count, this maybe inaccurate.  */
+#define HP_TIMING_NOW(Var) \
+  ({ unsigned long long int _count; \
+     asm volatile ("rdhwr\t%0,$2" : "=r" (_count)); \
+     (Var) = _count; })
+
+#include <hp-timing-common.h>
+
+#endif /* hp-timing.h */
diff mbox series

Patch

diff --git a/sysdeps/mips/hp-timing.h b/sysdeps/mips/hp-timing.h
new file mode 100644
index 0000000000..de21debdb7
--- /dev/null
+++ b/sysdeps/mips/hp-timing.h
@@ -0,0 +1,43 @@ 
+/* High precision, low overhead timing functions. MIPS version.
+   Copyright (C) 2002-2020 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
+
+#if __mips_isa_rev => 2
+/* We always assume having the timestamp register.  */
+#define HP_TIMING_AVAIL		(0)
+#define HP_SMALL_TIMING_AVAIL	(1)
+
+/* We indeed have inlined functions.  */
+#define HP_TIMING_INLINE	(1)
+
+/* We use 32bit values for the times.  */
+typedef unsigned int hp_timing_t;
+
+/* Read the cp0 count, this maybe inaccurate.  */
+#define HP_TIMING_NOW(Var) \
+  ({ unsigned int _count; \
+     asm volatile ("rdhwr\t%0,$2" : "=r" (_count)); \
+     (Var) = _count; })
+
+#include <hp-timing-common.h>
+
+#endif
+
+#endif /* hp-timing.h */