1/*
2 * Copyright (c) 2008, 2011, 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
25#include "precompiled.hpp"
26#include "runtime/os.hpp"
27#include "vm_version_arm.hpp"
28
29# include <sys/utsname.h>
30
31// Use uname() to find the architecture version
32void VM_Version::get_os_cpu_info() {
33  struct utsname name;
34  static bool done = false;
35
36  // Support for multiple calls in the init phase
37  if (done) return;
38  done = true;
39
40  uname(&name);
41  if (strncmp(name.machine, "aarch64", 7) == 0) {
42    _arm_arch = 8;
43  } else if (strncmp(name.machine, "armv", 4) == 0 &&
44      name.machine[4] >= '5' && name.machine[4] <= '9') {
45    _arm_arch = (int)(name.machine[4] - '0');
46  }
47}
48
49// Make sure that _arm_arch is initialized so that any calls to OrderAccess will
50// use proper dmb instruction
51void VM_Version::early_initialize() {
52  get_os_cpu_info();
53}
54