1 /* 2 * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2014, 2020, Red Hat Inc. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 #ifndef CPU_AARCH64_VM_VERSION_AARCH64_HPP 27 #define CPU_AARCH64_VM_VERSION_AARCH64_HPP 28 29 #include "runtime/abstract_vm_version.hpp" 30 #include "utilities/sizes.hpp" 31 32 class VM_Version : public Abstract_VM_Version { 33 friend class JVMCIVMStructs; 34 35 protected: 36 static int _cpu; 37 static int _model; 38 static int _model2; 39 static int _variant; 40 static int _revision; 41 static int _stepping; 42 43 static int _zva_length; 44 static int _dcache_line_size; 45 static int _icache_line_size; 46 static int _initial_sve_vector_length; 47 48 // Read additional info using OS-specific interfaces 49 static void get_os_cpu_info(); 50 51 // Sets the SVE length and returns a new actual value or negative on error. 52 // If the len is larger than the system largest supported SVE vector length, 53 // the function sets the largest supported value. 54 static int set_and_get_current_sve_vector_length(int len); 55 static int get_current_sve_vector_length(); 56 57 public: 58 // Initialization 59 static void initialize(); 60 61 // Asserts assert_is_initialized()62 static void assert_is_initialized() { 63 } 64 expensive_load(int ld_size,int scale)65 static bool expensive_load(int ld_size, int scale) { 66 if (cpu_family() == CPU_ARM) { 67 // Half-word load with index shift by 1 (aka scale is 2) has 68 // extra cycle latency, e.g. ldrsh w0, [x1,w2,sxtw #1]. 69 if (ld_size == 2 && scale == 2) { 70 return true; 71 } 72 } 73 return false; 74 } 75 76 // The CPU implementer codes can be found in 77 // ARM Architecture Reference Manual ARMv8, for ARMv8-A architecture profile 78 // https://developer.arm.com/docs/ddi0487/latest 79 enum Family { 80 CPU_AMPERE = 0xC0, 81 CPU_ARM = 'A', 82 CPU_BROADCOM = 'B', 83 CPU_CAVIUM = 'C', 84 CPU_DEC = 'D', 85 CPU_HISILICON = 'H', 86 CPU_INFINEON = 'I', 87 CPU_MOTOROLA = 'M', 88 CPU_NVIDIA = 'N', 89 CPU_AMCC = 'P', 90 CPU_QUALCOM = 'Q', 91 CPU_MARVELL = 'V', 92 CPU_INTEL = 'i', 93 }; 94 95 enum Feature_Flag { 96 CPU_FP = (1<<0), 97 CPU_ASIMD = (1<<1), 98 CPU_EVTSTRM = (1<<2), 99 CPU_AES = (1<<3), 100 CPU_PMULL = (1<<4), 101 CPU_SHA1 = (1<<5), 102 CPU_SHA2 = (1<<6), 103 CPU_CRC32 = (1<<7), 104 CPU_LSE = (1<<8), 105 CPU_DCPOP = (1<<16), 106 CPU_SHA3 = (1<<17), 107 CPU_SHA512 = (1<<21), 108 CPU_SVE = (1<<22), 109 // flags above must follow Linux HWCAP 110 CPU_SVE2 = (1<<28), 111 CPU_STXR_PREFETCH= (1<<29), 112 CPU_A53MAC = (1<<30), 113 }; 114 cpu_family()115 static int cpu_family() { return _cpu; } cpu_model()116 static int cpu_model() { return _model; } cpu_model2()117 static int cpu_model2() { return _model2; } cpu_variant()118 static int cpu_variant() { return _variant; } cpu_revision()119 static int cpu_revision() { return _revision; } 120 is_zva_enabled()121 static bool is_zva_enabled() { return 0 <= _zva_length; } zva_length()122 static int zva_length() { 123 assert(is_zva_enabled(), "ZVA not available"); 124 return _zva_length; 125 } 126 icache_line_size()127 static int icache_line_size() { return _icache_line_size; } dcache_line_size()128 static int dcache_line_size() { return _dcache_line_size; } get_initial_sve_vector_length()129 static int get_initial_sve_vector_length() { return _initial_sve_vector_length; }; 130 supports_fast_class_init_checks()131 static bool supports_fast_class_init_checks() { return true; } supports_stack_watermark_barrier()132 constexpr static bool supports_stack_watermark_barrier() { return true; } 133 }; 134 135 #endif // CPU_AARCH64_VM_VERSION_AARCH64_HPP 136