--- /dev/null	2019-06-10 08:42:37.317240407 +0100
+++ new/src/hotspot/os_cpu/linux_aarch64/gc/z/zPhysicalMemoryBacking_linux_aarch64.hpp	2019-06-10 14:25:50.010347194 +0100
@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2015, 2019, Oracle and/or its affiliates. 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_AARCH64_GC_Z_ZPHYSICALMEMORYBACKING_LINUX_AARCH64_HPP
+#define OS_CPU_LINUX_AARCH64_GC_Z_ZPHYSICALMEMORYBACKING_LINUX_AARCH64_HPP
+
+#include "gc/z/zBackingFile_linux_aarch64.hpp"
+#include "gc/z/zMemory.hpp"
+
+class ZErrno;
+class ZPhysicalMemory;
+
+class ZPhysicalMemoryBacking {
+private:
+  ZBackingFile   _file;
+  ZMemoryManager _committed;
+  ZMemoryManager _uncommitted;
+
+  void warn_available_space(size_t max) const;
+  void warn_max_map_count(size_t max) const;
+
+  void map_failed(ZErrno err) const;
+
+  void advise_view(uintptr_t addr, size_t size, int advice) const;
+  void pretouch_view(uintptr_t addr, size_t size) const;
+  void map_view(const ZPhysicalMemory& pmem, uintptr_t addr, bool pretouch) const;
+  void unmap_view(const ZPhysicalMemory& pmem, uintptr_t addr) const;
+
+public:
+  bool is_initialized() const;
+
+  void warn_commit_limits(size_t max) const;
+  bool supports_uncommit();
+
+  size_t commit(size_t size);
+  size_t uncommit(size_t size);
+
+  ZPhysicalMemory alloc(size_t size);
+  void free(const ZPhysicalMemory& pmem);
+
+  uintptr_t nmt_address(uintptr_t offset) const;
+
+  void map(const ZPhysicalMemory& pmem, uintptr_t offset) const;
+  void unmap(const ZPhysicalMemory& pmem, uintptr_t offset) const;
+
+  void debug_map(const ZPhysicalMemory& pmem, uintptr_t offset) const;
+  void debug_unmap(const ZPhysicalMemory& pmem, uintptr_t offset) const;
+};
+
+#endif // OS_CPU_LINUX_AARCH64_GC_Z_ZPHYSICALMEMORYBACKING_LINUX_AARCH64_HPP