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
  32 void 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
  51 void VM_Version::early_initialize() {
  52   get_os_cpu_info();
  53 }