* [ltt-dev] [PATCH 1/3] Make armv7l headers generic for the arm architecture
2011-02-23 21:47 [ltt-dev] [PATCH 0/3] Support for user space rcu for ARM < v7 Jason Wessel
@ 2011-02-23 21:47 ` Jason Wessel
2011-02-23 21:47 ` [ltt-dev] [PATCH 2/3] Change the arm headers to remove all the references to v7 Jason Wessel
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: Jason Wessel @ 2011-02-23 21:47 UTC (permalink / raw)
This commit simply moves the files named *armv7l* to *arm*
Signed-off-by: Jason Wessel <jason.wessel at windriver.com>
---
configure.ac | 2 +-
urcu/arch_arm.h | 56 ++++++++++++++++++++++++++++++++++++++++++++
urcu/arch_armv7l.h | 56 --------------------------------------------
urcu/uatomic_arch_arm.h | 50 +++++++++++++++++++++++++++++++++++++++
urcu/uatomic_arch_armv7l.h | 50 ---------------------------------------
5 files changed, 107 insertions(+), 107 deletions(-)
create mode 100644 urcu/arch_arm.h
delete mode 100644 urcu/arch_armv7l.h
create mode 100644 urcu/uatomic_arch_arm.h
delete mode 100644 urcu/uatomic_arch_armv7l.h
diff --git a/configure.ac b/configure.ac
index 02780e7..69ce396 100644
--- a/configure.ac
+++ b/configure.ac
@@ -52,7 +52,7 @@ case $host_cpu in
sparc64) ARCHTYPE="sparc64" ;;
alpha*) ARCHTYPE="alpha" ;;
ia64) ARCHTYPE="gcc" ;;
- armv7l) ARCHTYPE="armv7l" ;;
+ arm*) ARCHTYPE="arm" ;;
*) ARCHTYPE="unknown";;
esac
diff --git a/urcu/arch_arm.h b/urcu/arch_arm.h
new file mode 100644
index 0000000..125066b
--- /dev/null
+++ b/urcu/arch_arm.h
@@ -0,0 +1,56 @@
+#ifndef _URCU_ARCH_ARMV7L_H
+#define _URCU_ARCH_ARMV7L_H
+
+/*
+ * arch_armv7l.h: trivial definitions for the ARMv7 architecture.
+ *
+ * Copyright (c) 2010 Paul E. McKenney, IBM Corporation.
+ * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers at efficios.com>
+ *
+ * This 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.
+ *
+ * This 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <urcu/compiler.h>
+#include <urcu/config.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define cmm_mb() asm volatile("dmb":::"memory")
+
+#include <stdlib.h>
+#include <sys/time.h>
+
+typedef unsigned long long cycles_t;
+
+static inline cycles_t caa_get_cycles (void)
+{
+ cycles_t thetime;
+ struct timeval tv;
+
+ if (gettimeofday(&tv, NULL) != 0)
+ return 0;
+ thetime = ((cycles_t)tv.tv_sec) * 1000000ULL + ((cycles_t)tv.tv_usec);
+ return (cycles_t)thetime;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#include <urcu/arch_generic.h>
+
+#endif /* _URCU_ARCH_ARMV7L_H */
diff --git a/urcu/arch_armv7l.h b/urcu/arch_armv7l.h
deleted file mode 100644
index 125066b..0000000
--- a/urcu/arch_armv7l.h
+++ /dev/null
@@ -1,56 +0,0 @@
-#ifndef _URCU_ARCH_ARMV7L_H
-#define _URCU_ARCH_ARMV7L_H
-
-/*
- * arch_armv7l.h: trivial definitions for the ARMv7 architecture.
- *
- * Copyright (c) 2010 Paul E. McKenney, IBM Corporation.
- * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers at efficios.com>
- *
- * This 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.
- *
- * This 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 this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include <urcu/compiler.h>
-#include <urcu/config.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#define cmm_mb() asm volatile("dmb":::"memory")
-
-#include <stdlib.h>
-#include <sys/time.h>
-
-typedef unsigned long long cycles_t;
-
-static inline cycles_t caa_get_cycles (void)
-{
- cycles_t thetime;
- struct timeval tv;
-
- if (gettimeofday(&tv, NULL) != 0)
- return 0;
- thetime = ((cycles_t)tv.tv_sec) * 1000000ULL + ((cycles_t)tv.tv_usec);
- return (cycles_t)thetime;
-}
-
-#ifdef __cplusplus
-}
-#endif
-
-#include <urcu/arch_generic.h>
-
-#endif /* _URCU_ARCH_ARMV7L_H */
diff --git a/urcu/uatomic_arch_arm.h b/urcu/uatomic_arch_arm.h
new file mode 100644
index 0000000..b68c818
--- /dev/null
+++ b/urcu/uatomic_arch_arm.h
@@ -0,0 +1,50 @@
+#ifndef _URCU_ARCH_UATOMIC_ARMV7L_H
+#define _URCU_ARCH_UATOMIC_ARMV7L_H
+
+/*
+ * Atomics for ARMv7. This approach is usable on kernels back to 2.6.15.
+ *
+ * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
+ * Copyright (c) 1996-1999 by Silicon Graphics. All rights reserved.
+ * Copyright (c) 1999-2004 Hewlett-Packard Development Company, L.P.
+ * Copyright (c) 2009 Mathieu Desnoyers
+ * Copyright (c) 2010 Paul E. McKenney, IBM Corporation
+ * (Adapted from uatomic_arch_ppc.h)
+ *
+ * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
+ * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
+ *
+ * Permission is hereby granted to use or copy this program
+ * for any purpose, provided the above notices are retained on all copies.
+ * Permission to modify the code and to distribute modified code is granted,
+ * provided the above notices are retained, and a notice that the code was
+ * modified is included with the above copyright notice.
+ *
+ * Code inspired from libuatomic_ops-1.2, inherited in part from the
+ * Boehm-Demers-Weiser conservative garbage collector.
+ */
+
+#include <urcu/compiler.h>
+#include <urcu/system.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* xchg */
+#define uatomic_xchg(addr, v) __sync_lock_test_and_set(addr, v)
+
+/* cmpxchg */
+#define uatomic_cmpxchg(addr, old, _new) \
+ __sync_val_compare_and_swap(addr, old, _new)
+
+/* uatomic_add_return */
+#define uatomic_add_return(addr, v) __sync_add_and_fetch(addr, v)
+
+#ifdef __cplusplus
+}
+#endif
+
+#include <urcu/uatomic_generic.h>
+
+#endif /* _URCU_ARCH_UATOMIC_ARMV7L_H */
diff --git a/urcu/uatomic_arch_armv7l.h b/urcu/uatomic_arch_armv7l.h
deleted file mode 100644
index b68c818..0000000
--- a/urcu/uatomic_arch_armv7l.h
+++ /dev/null
@@ -1,50 +0,0 @@
-#ifndef _URCU_ARCH_UATOMIC_ARMV7L_H
-#define _URCU_ARCH_UATOMIC_ARMV7L_H
-
-/*
- * Atomics for ARMv7. This approach is usable on kernels back to 2.6.15.
- *
- * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
- * Copyright (c) 1996-1999 by Silicon Graphics. All rights reserved.
- * Copyright (c) 1999-2004 Hewlett-Packard Development Company, L.P.
- * Copyright (c) 2009 Mathieu Desnoyers
- * Copyright (c) 2010 Paul E. McKenney, IBM Corporation
- * (Adapted from uatomic_arch_ppc.h)
- *
- * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
- * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
- *
- * Permission is hereby granted to use or copy this program
- * for any purpose, provided the above notices are retained on all copies.
- * Permission to modify the code and to distribute modified code is granted,
- * provided the above notices are retained, and a notice that the code was
- * modified is included with the above copyright notice.
- *
- * Code inspired from libuatomic_ops-1.2, inherited in part from the
- * Boehm-Demers-Weiser conservative garbage collector.
- */
-
-#include <urcu/compiler.h>
-#include <urcu/system.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/* xchg */
-#define uatomic_xchg(addr, v) __sync_lock_test_and_set(addr, v)
-
-/* cmpxchg */
-#define uatomic_cmpxchg(addr, old, _new) \
- __sync_val_compare_and_swap(addr, old, _new)
-
-/* uatomic_add_return */
-#define uatomic_add_return(addr, v) __sync_add_and_fetch(addr, v)
-
-#ifdef __cplusplus
-}
-#endif
-
-#include <urcu/uatomic_generic.h>
-
-#endif /* _URCU_ARCH_UATOMIC_ARMV7L_H */
--
1.7.0
^ permalink raw reply [flat|nested] 6+ messages in thread* [ltt-dev] [PATCH 3/3] Add a test for the dmb instruction on ARM
2011-02-23 21:47 [ltt-dev] [PATCH 0/3] Support for user space rcu for ARM < v7 Jason Wessel
2011-02-23 21:47 ` [ltt-dev] [PATCH 1/3] Make armv7l headers generic for the arm architecture Jason Wessel
2011-02-23 21:47 ` [ltt-dev] [PATCH 2/3] Change the arm headers to remove all the references to v7 Jason Wessel
@ 2011-02-23 21:47 ` Jason Wessel
2011-02-28 16:36 ` [ltt-dev] [PATCH 0/3] Support for user space rcu for ARM < v7 Mathieu Desnoyers
2011-02-28 16:40 ` Mathieu Desnoyers
4 siblings, 0 replies; 6+ messages in thread
From: Jason Wessel @ 2011-02-23 21:47 UTC (permalink / raw)
The dmb instruction is used to implement a memory barrier on modern
ARM hardware. The older generations of processors which are included
in single processor systems can get by on the generic implementation
of the cmm_mb(). This will allow the user space rcu to work on many
other ARM systems.
Signed-off-by: Jason Wessel <jason.wessel at windriver.com>
---
configure.ac | 20 ++++++++++++++++++++
urcu/arch_arm.h | 2 ++
2 files changed, 22 insertions(+), 0 deletions(-)
diff --git a/configure.ac b/configure.ac
index 69ce396..3e1b501 100644
--- a/configure.ac
+++ b/configure.ac
@@ -20,6 +20,7 @@ AH_TEMPLATE([CONFIG_RCU_HAVE_FENCE], [Defined when on a system that has memory f
AH_TEMPLATE([CONFIG_RCU_HAVE_FUTEX], [Defined when on a system with futex support.])
AH_TEMPLATE([CONFIG_RCU_COMPAT_ARCH], [Compatibility mode for i386 which lacks
cmpxchg instruction.])
+AH_TEMPLATE([CONFIG_ARM_HAVE_DMB], [Use the dmb instruction is available for use on ARM.])
# Checks for programs.
AC_PROG_CC
@@ -56,6 +57,25 @@ case $host_cpu in
*) ARCHTYPE="unknown";;
esac
+if test "x$ARCHTYPE" = "xarm" ; then
+AC_MSG_CHECKING([checking for dmb instruction])
+AC_TRY_COMPILE(
+[
+],
+[
+asm volatile("dmb":::"memory");
+],
+[
+ AC_MSG_RESULT([yes])
+ AC_DEFINE([CONFIG_ARM_HAVE_DMB], [1])
+]
+,
+[
+ AC_MSG_RESULT([no])
+]
+)
+fi
+
UATOMICSRC=urcu/uatomic_arch_$ARCHTYPE.h
ARCHSRC=urcu/arch_$ARCHTYPE.h
if test "x$ARCHTYPE" != xx86 -a "x$ARCHTYPE" != xppc; then
diff --git a/urcu/arch_arm.h b/urcu/arch_arm.h
index e25457d..83cbb60 100644
--- a/urcu/arch_arm.h
+++ b/urcu/arch_arm.h
@@ -29,7 +29,9 @@
extern "C" {
#endif
+#ifdef CONFIG_ARM_HAVE_DMB
#define cmm_mb() asm volatile("dmb":::"memory")
+#endif /* CONFIG_ARM_HAVE_DMB */
#include <stdlib.h>
#include <sys/time.h>
--
1.7.0
^ permalink raw reply [flat|nested] 6+ messages in thread