114 lines
3.8 KiB
C++
114 lines
3.8 KiB
C++
/*
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* Copyright (c) 2008, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef CPU_ARM_VM_VERSION_ARM_HPP
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#define CPU_ARM_VM_VERSION_ARM_HPP
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#include "runtime/abstract_vm_version.hpp"
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#include "runtime/globals_extension.hpp"
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class VM_Version: public Abstract_VM_Version {
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friend class JVMCIVMStructs;
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static bool _has_simd;
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static bool _has_mp_ext;
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protected:
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// Are we done with vm version initialization
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static bool _is_initialized;
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public:
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static void initialize();
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static bool is_initialized() { return _is_initialized; }
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protected:
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enum Feature_Flag {
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vfp = 0,
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vfp3_32 = 1,
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simd = 2,
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mp_ext = 3
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};
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enum Feature_Flag_Set {
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unknown_m = 0,
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all_features_m = -1,
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vfp_m = 1 << vfp,
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vfp3_32_m = 1 << vfp3_32,
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simd_m = 1 << simd,
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mp_ext_m = 1 << mp_ext
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};
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// The value stored by "STR PC, [addr]" instruction can be either
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// (address of this instruction + 8) or (address of this instruction + 12)
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// depending on hardware implementation.
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// This adjustment is calculated in runtime.
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static int _stored_pc_adjustment;
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// ARM architecture version: 5 = ARMv5, 6 = ARMv6, 7 = ARMv7 etc.
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static int _arm_arch;
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// linux kernel atomic helper function version info
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// __kuser_cmpxchg() if version >= 2
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// __kuser_cmpxchg64() if version >= 5
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static int _kuser_helper_version;
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#define KUSER_HELPER_VERSION_ADDR 0xffff0ffc
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#define KUSER_VERSION_CMPXCHG32 2
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#define KUSER_VERSION_CMPXCHG64 5
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// Read additional info using OS-specific interfaces
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static void get_os_cpu_info();
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public:
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static void early_initialize();
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static int arm_arch() { return _arm_arch; }
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static int stored_pc_adjustment() { return _stored_pc_adjustment; }
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static bool supports_rev() { return _arm_arch >= 6; }
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static bool supports_ldrex() { return _arm_arch >= 6; }
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static bool supports_movw() { return _arm_arch >= 7; }
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static bool supports_ldrexd() { return _arm_arch >= 7; }
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static bool supports_compare_and_exchange() { return true; }
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static bool supports_kuser_cmpxchg32() { return _kuser_helper_version >= KUSER_VERSION_CMPXCHG32; }
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static bool supports_kuser_cmpxchg64() { return _kuser_helper_version >= KUSER_VERSION_CMPXCHG64; }
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// Override Abstract_VM_Version implementation
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static bool use_biased_locking();
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static bool has_vfp() { return (_features & vfp_m) != 0; }
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static bool has_vfp3_32() { return (_features & vfp3_32_m) != 0; }
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static bool has_simd() { return (_features & simd_m) != 0; }
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static bool has_multiprocessing_extensions() { return (_features & mp_ext_m) != 0; }
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static bool simd_math_is_compliant() { return false; }
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static bool prefer_moves_over_load_literal() { return supports_movw(); }
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friend class VM_Version_StubGenerator;
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};
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#endif // CPU_ARM_VM_VERSION_ARM_HPP
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