--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/os/aix/safepointMechanism_aix.cpp	Thu Aug 31 10:00:28 2017 +0200
@@ -0,0 +1,82 @@
+/*
+ * 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.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "logging/log.hpp"
+#include "runtime/globals.hpp"
+#include "runtime/os.hpp"
+#include "runtime/safepointMechanism.hpp"
+
+void SafepointMechanism::pd_initialize() {
+  char* map_address = MAP_FAILED;
+  size_t page_size = os::vm_page_size();
+  // Use optimized addresses for the polling page,
+  // e.g. map it to a special 32-bit address.
+  if (OptimizePollingPageLocation) {
+    // architecture-specific list of address wishes:
+    char* address_wishes[] = {
+        // AIX: addresses lower than 0x30000000 don't seem to work on AIX.
+        // PPC64: all address wishes are non-negative 32 bit values where
+        // the lower 16 bits are all zero. we can load these addresses
+        // with a single ppc_lis instruction.
+        (address) 0x30000000, (address) 0x31000000,
+        (address) 0x32000000, (address) 0x33000000,
+        (address) 0x40000000, (address) 0x41000000,
+        (address) 0x42000000, (address) 0x43000000,
+        (address) 0x50000000, (address) 0x51000000,
+        (address) 0x52000000, (address) 0x53000000,
+        (address) 0x60000000, (address) 0x61000000,
+        (address) 0x62000000, (address) 0x63000000
+    };
+    int address_wishes_length = sizeof(address_wishes)/sizeof(address);
+
+    // iterate over the list of address wishes:
+    for (int i=0; i<address_wishes_length; i++) {
+      // Try to map with current address wish.
+      // AIX: AIX needs MAP_FIXED if we provide an address and mmap will
+      // fail if the address is already mapped.
+      map_address = os::attempt_reserve_memory_at(page_size, address_wishes[i] - page_size);
+      log_debug(os)("SafePoint Polling  Page address: %p (wish) => %p",
+          address_wishes[i], map_address + (ssize_t)page_size);
+
+      if (map_address + (ssize_t)page_size == address_wishes[i]) {
+        // Map succeeded and map_address is at wished address, exit loop.
+        break;
+      }
+
+      if (map_address != (address) MAP_FAILED) {
+        // Map succeeded, but polling_page is not at wished address, unmap and continue.
+        os::release_memory(map_address, page_size);
+        map_address = (address) MAP_FAILED;
+      }
+      // Map failed, continue loop.
+    }
+  }
+  if (map_address == (address) MAP_FAILED) {
+    map_address = os::reserve_memory(page_size, NULL, page_size);
+  }
+  guarantee(map_address != MAP_FAILED, "SafepointMechanism::pd_initialize: failed to allocate polling page");
+  os::commit_memory_or_exit(map_address, page_size, false, "Unable to commit memory for polling page");
+  os::set_polling_page((address)(map_address));
+}