1 /*
   2  * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 #include "precompiled.hpp"
  25 #include "gc/z/zVirtualMemory.hpp"
  26 #include "logging/log.hpp"
  27 
  28 #include <sys/mman.h>
  29 #include <sys/types.h>
  30 
  31 bool ZVirtualMemoryManager::reserve(uintptr_t start, size_t size) {
  32   // Reserve address space
  33   const uintptr_t actual_start = (uintptr_t)mmap((void*)start, size, PROT_NONE,
  34                                                  MAP_ANONYMOUS|MAP_PRIVATE|MAP_NORESERVE, -1, 0);
  35   if (actual_start != start) {
  36     log_error(gc)("Failed to reserve address space for Java heap");
  37     return false;
  38   }
  39 
  40   return true;
  41 }