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 }