+#ifndef _URCU_ARCH_GENERIC_H
+#define _URCU_ARCH_GENERIC_H
+
+/*
+ * arch_generic.h: common definitions for multiple architectures.
+ *
+ * Copyright (c) 2010 Paolo Bonzini <pbonzini@redhat.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
+
+#ifndef CACHE_LINE_SIZE
+#define CACHE_LINE_SIZE 64
+#endif
+
+#if !defined(mc) && !defined(rmc) && !defined(wmc)
+#define CONFIG_HAVE_MEM_COHERENCY
+/*
+ * Architectures with cache coherency must _not_ define mc/rmc/wmc.
+ *
+ * For them, mc/rmc/wmc are implemented with a * simple compiler barrier;
+ * in addition, we provide defaults for mb (using GCC builtins) as well as
+ * rmb and wmb (defaulting to mb).
+ */
+
+#ifndef mb
+#define mb() __sync_synchronize()
+#endif
+
+#ifndef rmb
+#define rmb() mb()
+#endif
+
+#ifndef wmb
+#define wmb() mb()
+#endif
+
+#define mc() barrier()
+#define rmc() barrier()
+#define wmc() barrier()
+#else
+/*
+ * Architectures without cache coherency need something like the following:
+ *
+ * #define mc() arch_cache_flush()
+ * #define rmc() arch_cache_flush_read()
+ * #define wmc() arch_cache_flush_write()
+ *
+ * Of these, only mc is mandatory. rmc and wmc default to mc. mb/rmb/wmb
+ * use these definitions by default:
+ *
+ * #define mb() mc()
+ * #define rmb() rmc()
+ * #define wmb() wmc()
+ */
+
+#ifndef mb
+#define mb() mc()
+#endif
+
+#ifndef rmb
+#define rmb() rmc()
+#endif
+
+#ifndef wmb
+#define wmb() wmc()
+#endif
+
+#ifndef rmc
+#define rmc() mc()
+#endif
+
+#ifndef wmc
+#define wmc() mc()
+#endif
+#endif
+
+/* Nop everywhere except on alpha. */
+#ifndef read_barrier_depends
+#define read_barrier_depends()
+#endif
+
+#ifdef CONFIG_RCU_SMP
+#define smp_mb() mb()
+#define smp_rmb() rmb()
+#define smp_wmb() wmb()
+#define smp_mc() mc()
+#define smp_rmc() rmc()
+#define smp_wmc() wmc()
+#define smp_read_barrier_depends() read_barrier_depends()
+#else
+#define smp_mb() barrier()
+#define smp_rmb() barrier()
+#define smp_wmb() barrier()
+#define smp_mc() barrier()
+#define smp_rmc() barrier()
+#define smp_wmc() barrier()
+#define smp_read_barrier_depends()
+#endif
+
+#ifndef cpu_relax
+#define cpu_relax() barrier()
+#endif
+
+#ifndef sync_core
+#define sync_core() mb()
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _URCU_ARCH_GENERIC_H */