--- /dev/null	2019-10-01 11:37:31.106015611 +0200
+++ new/src/hotspot/os/windows/gc/z/zSyscall_windows.hpp	2019-10-31 09:39:47.817091177 +0100
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 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_WINDOWS_GC_Z_ZSYSCALL_WINDOWS_HPP
+#define OS_WINDOWS_GC_Z_ZSYSCALL_WINDOWS_HPP
+
+#include "utilities/globalDefinitions.hpp"
+
+#include <Windows.h>
+#include <Memoryapi.h>
+
+class ZSyscall {
+private:
+  typedef HANDLE (*CreateFileMappingWFn)(HANDLE, LPSECURITY_ATTRIBUTES, DWORD, DWORD, DWORD, LPCWSTR);
+  typedef PVOID (*VirtualAlloc2Fn)(HANDLE, PVOID, SIZE_T, ULONG, ULONG, MEM_EXTENDED_PARAMETER*, ULONG);
+  typedef BOOL (*VirtualFreeExFn)(HANDLE, LPVOID, SIZE_T, DWORD);
+  typedef PVOID (*MapViewOfFile3Fn)(HANDLE, HANDLE, PVOID, ULONG64, SIZE_T, ULONG, ULONG, MEM_EXTENDED_PARAMETER*, ULONG);
+  typedef BOOL (*UnmapViewOfFile2Fn)(HANDLE, PVOID, ULONG);
+
+public:
+  static CreateFileMappingWFn CreateFileMappingW;
+  static VirtualAlloc2Fn      VirtualAlloc2;
+  static VirtualFreeExFn      VirtualFreeEx;
+  static MapViewOfFile3Fn     MapViewOfFile3;
+  static UnmapViewOfFile2Fn   UnmapViewOfFile2;
+
+  static void initialize();
+};
+
+#endif // OS_WINDOWS_GC_Z_ZSYSCALL_WINDOWS_HPP