--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/z/zPageTableEntry.hpp	Tue Jun 12 17:40:28 2018 +0200
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2017, 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 SHARE_GC_Z_ZPAGETABLEENTRY_HPP
+#define SHARE_GC_Z_ZPAGETABLEENTRY_HPP
+
+#include "gc/z/zBitField.hpp"
+#include "memory/allocation.hpp"
+
+//
+// Page table entry layout
+// -----------------------
+//
+//   6
+//   3                                                                    1 0
+//  +----------------------------------------------------------------------+-+
+//  |11111111 11111111 11111111 11111111 11111111 11111111 11111111 1111111|1|
+//  +----------------------------------------------------------------------+-+
+//  |                                                                      |
+//  |                                          0-0 Relocating Flag (1-bit) *
+//  |
+//  |
+//  |
+//  * 63-1 Page address (63-bits)
+//
+
+class ZPage;
+
+class ZPageTableEntry {
+private:
+  typedef ZBitField<uint64_t, bool,   0, 1>     field_relocating;
+  typedef ZBitField<uint64_t, ZPage*, 1, 63, 1> field_page;
+
+  uint64_t _entry;
+
+public:
+  ZPageTableEntry() :
+      _entry(0) {}
+
+  ZPageTableEntry(ZPage* page, bool relocating) :
+      _entry(field_page::encode(page) |
+             field_relocating::encode(relocating)) {}
+
+  bool relocating() const {
+    return field_relocating::decode(_entry);
+  }
+
+  ZPage* page() const {
+    return field_page::decode(_entry);
+  }
+};
+
+#endif // SHARE_GC_Z_ZPAGETABLEENTRY_HPP