+#ifndef _URCU_ARCH_PPC_H
+#define _URCU_ARCH_PPC_H
+
+/*
+ * arch_ppc.h: trivial definitions for the powerpc 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/arch_uatomic.h>
+
+#define CONFIG_HAVE_FENCE 1
+#define CONFIG_HAVE_MEM_COHERENCY
+
+#ifndef BITS_PER_LONG
+#define BITS_PER_LONG (__SIZEOF_LONG__ * 8)
+#endif
+
+#define mb() asm volatile("sync":::"memory")
+#define rmb() asm volatile("sync":::"memory")
+#define wmb() asm volatile("sync"::: "memory")
+
+/*
+ * 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()
+
+/* Assume SMP machine, given we don't have this information */
+#define CONFIG_SMP 1
+
+#ifdef CONFIG_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()
+{
+ asm volatile("isync" : : : "memory");
+}
+
+#define mftbl() \
+ ({ \
+ unsigned long rval; \
+ asm volatile("mftbl %0" : "=r" (rval)); \
+ rval; \
+ })
+
+#define mftbu() \
+ ({ \
+ unsigned long rval; \
+ asm volatile("mftbu %0" : "=r" (rval)); \
+ rval; \
+ })
+
+typedef unsigned long long cycles_t;
+
+static inline cycles_t get_cycles (void)
+{
+ long h, l;
+
+ for (;;) {
+ h = mftbu();
+ barrier();
+ l = mftbl();
+ barrier();
+ if (mftbu() == h)
+ return (((cycles_t) h) << 32) + l;
+ }
+}
+
+#endif /* _URCU_ARCH_PPC_H */