Cleanup headers

[urcu.git] / urcu / arch_ppc.h

diff --git a/urcu/arch_ppc.h b/urcu/arch_ppc.h
new file mode 100644 (file)
index 0000000..8dfd6d1
--- /dev/null
+++ b/urcu/arch_ppc.h
@@ -0,0 +1,119 @@
+#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 */