JDK14/Java14源码在线阅读

/*
 * Copyright (c) 2013, 2019, 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_X86_VM_VERSION_EXT_X86_HPP
#define CPU_X86_VM_VERSION_EXT_X86_HPP

#include "runtime/vm_version.hpp"
#include "utilities/macros.hpp"

class VM_Version_Ext : public VM_Version {

  enum {
    ExtendedFamilyIdLength_INTEL = 16,
    ExtendedFamilyIdLength_AMD   = 24
  };

 private:
  static const size_t      VENDOR_LENGTH;
  static const size_t      CPU_EBS_MAX_LENGTH;
  static const size_t      CPU_TYPE_DESC_BUF_SIZE;
  static const size_t      CPU_DETAILED_DESC_BUF_SIZE;

  static const char* const _family_id_intel[ExtendedFamilyIdLength_INTEL];
  static const char* const _family_id_amd[ExtendedFamilyIdLength_AMD];
  static const char* const _brand_id[];
  static const char* const _model_id_pentium_pro[];

  static const char* const _feature_edx_id[];
  static const char* const _feature_extended_edx_id[];
  static const char* const _feature_ecx_id[];
  static const char* const _feature_extended_ecx_id[];

  static int               _no_of_threads;
  static int               _no_of_cores;
  static int               _no_of_packages;
  static char*             _cpu_brand_string;
  static jlong             _max_qualified_cpu_frequency;

  static const char* cpu_family_description(void);
  static const char* cpu_model_description(void);
  static const char* cpu_brand(void);
  static const char* cpu_brand_string(void);

  static int cpu_type_description(char* const buf, size_t buf_len);
  static int cpu_detailed_description(char* const buf, size_t buf_len);
  static int cpu_extended_brand_string(char* const buf, size_t buf_len);

  static bool cpu_is_em64t(void);
  static bool is_netburst(void);

  // Returns bytes written excluding termninating null byte.
  static size_t cpu_write_support_string(char* const buf, size_t buf_len);
  static void resolve_cpu_information_details(void);
  static jlong max_qualified_cpu_freq_from_brand_string(void);

 public:
  // Offsets for cpuid asm stub brand string
  static ByteSize proc_name_0_offset() { return byte_offset_of(CpuidInfo, proc_name_0); }
  static ByteSize proc_name_1_offset() { return byte_offset_of(CpuidInfo, proc_name_1); }
  static ByteSize proc_name_2_offset() { return byte_offset_of(CpuidInfo, proc_name_2); }
  static ByteSize proc_name_3_offset() { return byte_offset_of(CpuidInfo, proc_name_3); }
  static ByteSize proc_name_4_offset() { return byte_offset_of(CpuidInfo, proc_name_4); }
  static ByteSize proc_name_5_offset() { return byte_offset_of(CpuidInfo, proc_name_5); }
  static ByteSize proc_name_6_offset() { return byte_offset_of(CpuidInfo, proc_name_6); }
  static ByteSize proc_name_7_offset() { return byte_offset_of(CpuidInfo, proc_name_7); }
  static ByteSize proc_name_8_offset() { return byte_offset_of(CpuidInfo, proc_name_8); }
  static ByteSize proc_name_9_offset() { return byte_offset_of(CpuidInfo, proc_name_9); }
  static ByteSize proc_name_10_offset() { return byte_offset_of(CpuidInfo, proc_name_10); }

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