Cleanup: Re-organise source dir

[urcu.git] / include / urcu / arch / ppc.h

diff --git a/include/urcu/arch/ppc.h b/include/urcu/arch/ppc.h
new file mode 100644 (file)
index 0000000..791529e
--- /dev/null
+++ b/include/urcu/arch/ppc.h
@@ -0,0 +1,125 @@
+#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@efficios.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>
+#include <urcu/syscall-compat.h>
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Include size of POWER5+ L3 cache lines: 256 bytes */
+#define CAA_CACHE_LINE_SIZE    256
+
+#ifdef __NO_LWSYNC__
+#define LWSYNC_OPCODE  "sync\n"
+#else
+#define LWSYNC_OPCODE  "lwsync\n"
+#endif
+
+/*
+ * Use sync for all cmm_mb/rmb/wmb barriers because lwsync does not
+ * preserve ordering of cacheable vs. non-cacheable accesses, so it
+ * should not be used to order with respect to MMIO operations.  An
+ * eieio+lwsync pair is also not enough for cmm_rmb, because it will
+ * order cacheable and non-cacheable memory operations separately---i.e.
+ * not the latter against the former.
+ */
+#define cmm_mb()         __asm__ __volatile__ ("sync":::"memory")
+
+/*
+ * lwsync orders loads in cacheable memory with respect to other loads,
+ * and stores in cacheable memory with respect to other stores.
+ * Therefore, use it for barriers ordering accesses to cacheable memory
+ * only.
+ */
+#define cmm_smp_rmb()    __asm__ __volatile__ (LWSYNC_OPCODE:::"memory")
+#define cmm_smp_wmb()    __asm__ __volatile__ (LWSYNC_OPCODE:::"memory")
+
+#define mftbl()                                                \
+       __extension__                                   \
+       ({                                              \
+               unsigned long rval;                     \
+               __asm__ __volatile__ ("mftbl %0" : "=r" (rval));        \
+               rval;                                   \
+       })
+
+#define mftbu()                                                \
+       __extension__                                   \
+       ({                                              \
+               unsigned long rval;                     \
+               __asm__ __volatile__ ("mftbu %0" : "=r" (rval));        \
+               rval;                                   \
+       })
+
+#define mftb()                                         \
+       __extension__                                   \
+       ({                                              \
+               unsigned long long rval;                \
+               __asm__ __volatile__ ("mftb %0" : "=r" (rval));         \
+               rval;                                   \
+       })
+
+#define HAS_CAA_GET_CYCLES
+
+typedef uint64_t caa_cycles_t;
+
+#ifdef __powerpc64__
+static inline caa_cycles_t caa_get_cycles(void)
+{
+       return (caa_cycles_t) mftb();
+}
+#else
+static inline caa_cycles_t caa_get_cycles(void)
+{
+       unsigned long h, l;
+
+       for (;;) {
+               h = mftbu();
+               cmm_barrier();
+               l = mftbl();
+               cmm_barrier();
+               if (mftbu() == h)
+                       return (((caa_cycles_t) h) << 32) + l;
+       }
+}
+#endif
+
+/*
+ * On Linux, define the membarrier system call number if not yet available in
+ * the system headers.
+ */
+#if (defined(__linux__) && !defined(__NR_membarrier))
+#define __NR_membarrier                365
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#include <urcu/arch/generic.h>
+
+#endif /* _URCU_ARCH_PPC_H */