Support for NIOS2 architecture

Add support for the Altera NIOS2 CPU archirecture. The atomic operations
are handled by the GCC. The memory barriers on this systems are entirely
trivial too, since the CPU does not support SMP at all.

Signed-off-by: Marek Vasut <marex@denx.de>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

LICENSE

@@ -45,6 +45,7 @@ compiler.h
 arch/s390.h
 uatomic/alpha.h
 uatomic/mips.h
+uatomic/nios2.h
 uatomic/s390.h
 system.h
 

README.md

@@ -43,6 +43,7 @@ Currently, the following architectures are supported:
   - S390, S390x
   - ARM 32/64
   - MIPS
+  - NIOS2
   - Alpha
   - ia64
   - Sparcv9 32/64

configure.ac

@@ -124,6 +124,7 @@ AS_CASE([$host_cpu],
 	[arm*], [ARCHTYPE="arm"],
 	[aarch64], [ARCHTYPE="aarch64"],
 	[mips*], [ARCHTYPE="mips"],
+	[nios2*], [ARCHTYPE="nios2"],
 	[tile*], [ARCHTYPE="tile"],
 	[hppa*], [ARCHTYPE="hppa"],
 	[ARCHTYPE="unknown"]

urcu/arch/nios2.h

@@ -0,0 +1,40 @@
+#ifndef _URCU_ARCH_NIOS2_H
+#define _URCU_ARCH_NIOS2_H
+
+/*
+ * arch_nios2.h: trivial definitions for the NIOS2 architecture.
+ *
+ * Copyright (c) 2016 Marek Vasut <marex@denx.de>
+ *
+ * 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>
+#include <urcu/syscall-compat.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define cmm_mb()	cmm_barrier()
+
+#ifdef __cplusplus
+}
+#endif
+
+#include <urcu/arch/generic.h>
+
+#endif /* _URCU_ARCH_NIOS2_H */

urcu/uatomic/nios2.h

@@ -0,0 +1,32 @@
+#ifndef _URCU_UATOMIC_ARCH_NIOS2_H
+#define _URCU_UATOMIC_ARCH_NIOS2_H
+
+/*
+ * Atomic exchange operations for the NIOS2 architecture. Let GCC do it.
+ *
+ * Copyright (c) 2016 Marek Vasut <marex@denx.de>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <urcu/compiler.h>
+#include <urcu/system.h>
+#include <urcu/uatomic/generic.h>
+
+#endif /* _URCU_UATOMIC_ARCH_NIOS2_H */