Quellcode-Bibliothek

^© Kompilation durch diese Firma

[Weder Korrektheit noch Funktionsfähigkeit der Software werden zugesichert.]

Datei: vm_version_arm.hpp Sprache: C

/*
* Copyright (c) 2008, 2021, 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.
*
*/

#ifndef CPU_ARM_VM_VERSION_ARM_HPP
#define CPU_ARM_VM_VERSION_ARM_HPP

#include "runtime/abstract_vm_version.hpp"
#include "runtime/globals_extension.hpp"

class VM_Version: public Abstract_VM_Version {
  friend class JVMCIVMStructs;

  static bool _has_simd;
  static bool _has_mp_ext;

protected:
  // Are we done with vm version initialization
  static bool _is_initialized;

public:
  static void initialize();
  static bool is_initialized()      { return _is_initialized; }

protected:
  enum Feature_Flag {
    vfp = 0,
    vfp3_32 = 1,
    simd = 2,
    mp_ext = 3
  };

  enum Feature_Flag_Set {
    unknown_m           = 0,
    all_features_m      = -1,

    vfp_m     = 1 << vfp,
    vfp3_32_m = 1 << vfp3_32,
    simd_m    = 1 << simd,
    mp_ext_m  = 1 << mp_ext
  };

  // The value stored by "STR PC, [addr]" instruction can be either
  // (address of this instruction + 8) or (address of this instruction + 12)
  // depending on hardware implementation.
  // This adjustment is calculated in runtime.
  static int _stored_pc_adjustment;

  // ARM architecture version: 5 = ARMv5, 6 = ARMv6, 7 = ARMv7 etc.
  static int _arm_arch;

  // linux kernel atomic helper function version info
  // __kuser_cmpxchg() if version >= 2
  // __kuser_cmpxchg64() if version >= 5
  static int _kuser_helper_version;

#define KUSER_HELPER_VERSION_ADDR 0xffff0ffc
#define KUSER_VERSION_CMPXCHG32 2
#define KUSER_VERSION_CMPXCHG64 5

  // Read additional info using OS-specific interfaces
  static void get_os_cpu_info();

public:
  static void early_initialize();

  static int arm_arch()             { return _arm_arch; }
  static int stored_pc_adjustment() { return _stored_pc_adjustment; }
  static bool supports_rev()        { return _arm_arch >= 6; }
  static bool supports_ldrex()      { return _arm_arch >= 6; }
  static bool supports_movw()       { return _arm_arch >= 7; }
  static bool supports_ldrexd()     { return _arm_arch >= 7; }
  static bool supports_compare_and_exchange() { return true; }
  static bool supports_kuser_cmpxchg32() { return _kuser_helper_version >= KUSER_VERSION_CMPXCHG32; }
  static bool supports_kuser_cmpxchg64() { return _kuser_helper_version >= KUSER_VERSION_CMPXCHG64; }

  static bool has_vfp()             { return (_features & vfp_m) != 0; }
  static bool has_vfp3_32()         { return (_features & vfp3_32_m) != 0; }
  static bool has_simd()            { return (_features & simd_m) != 0; }
  static bool has_multiprocessing_extensions() { return (_features & mp_ext_m) != 0; }

  static bool simd_math_is_compliant() { return false; }

  static bool prefer_moves_over_load_literal() { return supports_movw(); }

  friend class VM_Version_StubGenerator;

  static void initialize_cpu_information(void);
};

#endif // CPU_ARM_VM_VERSION_ARM_HPP

¤ Dauer der Verarbeitung: 0.4 Sekunden (vorverarbeitet) ¤

Download des Quellennavigators
Download des sprechenden Kalenders
in der Quellcodebibliothek suchen

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.