--- /dev/null
+#ifndef _URCU_SYSTEM_H
+#define _URCU_SYSTEM_H
+
+/*
+ * system.h
+ *
+ * System definitions.
+ *
+ * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * 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.
+ */
+
+#include <urcu/compiler.h>
+#include <urcu/arch.h>
+
+/*
+ * Identify a shared load. A cmm_smp_rmc() or cmm_smp_mc() should come
+ * before the load.
+ */
+#define _CMM_LOAD_SHARED(p) CMM_ACCESS_ONCE(p)
+
+/*
+ * Load a data from shared memory, doing a cache flush if required.
+ */
+#define CMM_LOAD_SHARED(p) \
+ __extension__ \
+ ({ \
+ cmm_smp_rmc(); \
+ _CMM_LOAD_SHARED(p); \
+ })
+
+/*
+ * Identify a shared store. A cmm_smp_wmc() or cmm_smp_mc() should
+ * follow the store.
+ */
+#define _CMM_STORE_SHARED(x, v) __extension__ ({ CMM_ACCESS_ONCE(x) = (v); })
+
+/*
+ * Store v into x, where x is located in shared memory. Performs the
+ * required cache flush after writing. Returns v.
+ */
+#define CMM_STORE_SHARED(x, v) \
+ __extension__ \
+ ({ \
+ __typeof__(x) _v = _CMM_STORE_SHARED(x, v); \
+ cmm_smp_wmc(); \
+ _v = _v; /* Work around clang "unused result" */ \
+ })
+
+#endif /* _URCU_SYSTEM_H */