--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/os_cpu/linux_ppc/orderAccess_linux_ppc.hpp	Wed Jun 06 10:45:40 2018 -0400
@@ -0,0 +1,97 @@
+/*
+ * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2014 SAP SE. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code 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 General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef OS_CPU_LINUX_PPC_VM_ORDERACCESS_LINUX_PPC_HPP
+#define OS_CPU_LINUX_PPC_VM_ORDERACCESS_LINUX_PPC_HPP
+
+// Included in orderAccess.hpp header file.
+
+#ifndef PPC64
+#error "OrderAccess currently only implemented for PPC64"
+#endif
+
+// Compiler version last used for testing: gcc 4.1.2
+// Please update this information when this file changes
+
+// Implementation of class OrderAccess.
+
+//
+// Machine barrier instructions:
+//
+// - sync            Two-way memory barrier, aka fence.
+// - lwsync          orders  Store|Store,
+//                            Load|Store,
+//                            Load|Load,
+//                   but not Store|Load
+// - eieio           orders  Store|Store
+// - isync           Invalidates speculatively executed instructions,
+//                   but isync may complete before storage accesses
+//                   associated with instructions preceding isync have
+//                   been performed.
+//
+// Semantic barrier instructions:
+// (as defined in orderAccess.hpp)
+//
+// - release         orders Store|Store,       (maps to lwsync)
+//                           Load|Store
+// - acquire         orders  Load|Store,       (maps to lwsync)
+//                           Load|Load
+// - fence           orders Store|Store,       (maps to sync)
+//                           Load|Store,
+//                           Load|Load,
+//                          Store|Load
+//
+
+#define inlasm_sync()     __asm__ __volatile__ ("sync"   : : : "memory");
+#define inlasm_lwsync()   __asm__ __volatile__ ("lwsync" : : : "memory");
+#define inlasm_eieio()    __asm__ __volatile__ ("eieio"  : : : "memory");
+#define inlasm_isync()    __asm__ __volatile__ ("isync"  : : : "memory");
+// Use twi-isync for load_acquire (faster than lwsync).
+#define inlasm_acquire_reg(X) __asm__ __volatile__ ("twi 0,%0,0\n isync\n" : : "r" (X) : "memory");
+
+inline void   OrderAccess::loadload()   { inlasm_lwsync(); }
+inline void   OrderAccess::storestore() { inlasm_lwsync(); }
+inline void   OrderAccess::loadstore()  { inlasm_lwsync(); }
+inline void   OrderAccess::storeload()  { inlasm_sync();   }
+
+inline void   OrderAccess::acquire()    { inlasm_lwsync(); }
+inline void   OrderAccess::release()    { inlasm_lwsync(); }
+inline void   OrderAccess::fence()      { inlasm_sync();   }
+
+
+template<size_t byte_size>
+struct OrderAccess::PlatformOrderedLoad<byte_size, X_ACQUIRE>
+{
+  template <typename T>
+  T operator()(const volatile T* p) const { register T t = Atomic::load(p); inlasm_acquire_reg(t); return t; }
+};
+
+#undef inlasm_sync
+#undef inlasm_lwsync
+#undef inlasm_eieio
+#undef inlasm_isync
+#undef inlasm_acquire_reg
+
+#endif // OS_CPU_LINUX_PPC_VM_ORDERACCESS_LINUX_PPC_HPP