| /* |
| * Copyright (c) 2008, 2014, 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_VM_VERSION_ARM_HPP |
| #define CPU_ARM_VM_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; |
| |
| protected: |
| // Are we done with vm version initialization |
| static bool _is_initialized; |
| |
| public: |
| static void initialize(); |
| static bool is_initialized() { return _is_initialized; } |
| |
| #ifdef AARCH64 |
| |
| public: |
| static bool supports_ldrex() { return true; } |
| static bool supports_ldrexd() { return true; } |
| static bool supports_movw() { return true; } |
| |
| // Override Abstract_VM_Version implementation |
| static bool use_biased_locking(); |
| |
| static bool has_simd() { return _has_simd; } |
| static bool has_vfp() { return has_simd(); } |
| static bool simd_math_is_compliant() { return true; } |
| |
| static bool prefer_moves_over_load_literal() { return true; } |
| |
| #else |
| |
| protected: |
| enum Feature_Flag { |
| vfp = 0, |
| vfp3_32 = 1, |
| simd = 2, |
| }; |
| |
| 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, |
| }; |
| |
| // 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; } |
| // Override Abstract_VM_Version implementation |
| static bool use_biased_locking(); |
| static const char* vm_info_string(); |
| |
| 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 simd_math_is_compliant() { return false; } |
| |
| static bool prefer_moves_over_load_literal() { return supports_movw(); } |
| |
| friend class VM_Version_StubGenerator; |
| |
| #endif // AARCH64 |
| }; |
| |
| #endif // CPU_ARM_VM_VM_VERSION_ARM_HPP |