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diff --git a/urcu/arch_sparc64.h b/urcu/arch_sparc64.h
new file mode 100644
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+++ b/urcu/arch_sparc64.h
@@ -0,0 +1,103 @@
+#ifndef _URCU_ARCH_SPARC64_H
+#define _URCU_ARCH_SPARC64_H
+
+/*
+ * arch_sparc64.h: trivial definitions for the Sparc64 architecture.
+ *
+ * Copyright (c) 2009 Paul E. McKenney, IBM Corporation.
+ * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
+ *
+ * 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>
+
+#define CONFIG_HAVE_MEM_COHERENCY
+
+#define CACHE_LINE_SIZE	256
+
+#ifndef BITS_PER_LONG
+#define BITS_PER_LONG	(__SIZEOF_LONG__ * 8)
+#endif
+
+/*
+ * Inspired from the Linux kernel. Workaround Spitfire bug #51.
+ */
+#define membar_safe(type)			\
+__asm__ __volatile__("ba,pt %%xcc, 1f\n\t"	\
+		     "membar " type "\n"	\
+		     "1:\n"			\
+		     : : : "memory")
+
+#define mb()    membar_safe("#LoadLoad | #LoadStore | #StoreStore | #StoreLoad")
+#define rmb()    membar_safe("#LoadLoad")
+#define wmb()    membar_safe("#StoreStore")
+
+/*
+ * Architectures without cache coherency need something like the following:
+ *
+ * #define mb()		mc()
+ * #define rmb()	rmc()
+ * #define wmb()	wmc()
+ * #define mc()		arch_cache_flush()
+ * #define rmc()	arch_cache_flush_read()
+ * #define wmc()	arch_cache_flush_write()
+ */
+
+#define mc()	barrier()
+#define rmc()	barrier()
+#define wmc()	barrier()
+
+#ifdef CONFIG_URCU_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()
+#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()
+#endif
+
+/* Nop everywhere except on alpha. */
+#define smp_read_barrier_depends()
+
+static inline void cpu_relax(void)
+{
+	barrier();
+}
+
+/*
+ * Serialize core instruction execution. Also acts as a compiler barrier.
+ */
+static inline void sync_core()
+{
+	mb();
+}
+
+typedef unsigned long long cycles_t;
+
+static inline cycles_t get_cycles (void)
+{
+	return 0;	/* unimplemented */
+}
+
+#endif /* _URCU_ARCH_SPARC64_H */