1 /* 2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2015, 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 #include "precompiled.hpp" 27 #include "asm/macroAssembler.hpp" 28 #include "asm/macroAssembler.inline.hpp" 29 #include "memory/resourceArea.hpp" 30 #include "runtime/java.hpp" 31 #include "runtime/stubCodeGenerator.hpp" 32 #include "vm_version_aarch64.hpp" 33 #ifdef TARGET_OS_FAMILY_linux 34 # include "os_linux.inline.hpp" 35 #endif 36 37 #ifndef BUILTIN_SIM 38 #include <sys/auxv.h> 39 #include <asm/hwcap.h> 40 #else 41 #define getauxval(hwcap) 0 42 #endif 43 44 #ifndef HWCAP_AES 45 #define HWCAP_AES (1<<3) 46 #endif 47 48 #ifndef HWCAP_SHA1 49 #define HWCAP_SHA1 (1<<5) 50 #endif 51 52 #ifndef HWCAP_SHA2 53 #define HWCAP_SHA2 (1<<6) 54 #endif 55 56 #ifndef HWCAP_CRC32 57 #define HWCAP_CRC32 (1<<7) 58 #endif 59 60 int VM_Version::_cpu; 61 int VM_Version::_model; 62 int VM_Version::_model2; 63 int VM_Version::_variant; 64 int VM_Version::_revision; 65 int VM_Version::_stepping; 66 int VM_Version::_cpuFeatures; 67 const char* VM_Version::_features_str = ""; 68 69 static BufferBlob* stub_blob; 70 static const int stub_size = 550; 71 72 extern "C" { 73 typedef void (*getPsrInfo_stub_t)(void*); 74 } 75 static getPsrInfo_stub_t getPsrInfo_stub = NULL; 76 77 78 class VM_Version_StubGenerator: public StubCodeGenerator { 79 public: 80 81 VM_Version_StubGenerator(CodeBuffer *c) : StubCodeGenerator(c) {} 82 83 address generate_getPsrInfo() { 84 StubCodeMark mark(this, "VM_Version", "getPsrInfo_stub"); 85 # define __ _masm-> 86 address start = __ pc(); 87 88 #ifdef BUILTIN_SIM 89 __ c_stub_prolog(1, 0, MacroAssembler::ret_type_void); 90 #endif 91 92 // void getPsrInfo(VM_Version::CpuidInfo* cpuid_info); 93 94 address entry = __ pc(); 95 96 // TODO : redefine fields in CpuidInfo and generate 97 // code to fill them in 98 99 __ ret(lr); 100 101 # undef __ 102 103 return start; 104 } 105 }; 106 107 108 void VM_Version::get_processor_features() { 109 _supports_cx8 = true; 110 _supports_atomic_getset4 = true; 111 _supports_atomic_getadd4 = true; 112 _supports_atomic_getset8 = true; 113 _supports_atomic_getadd8 = true; 114 115 if (FLAG_IS_DEFAULT(AllocatePrefetchDistance)) 116 FLAG_SET_DEFAULT(AllocatePrefetchDistance, 256); 117 if (FLAG_IS_DEFAULT(AllocatePrefetchStepSize)) 118 FLAG_SET_DEFAULT(AllocatePrefetchStepSize, 64); 119 FLAG_SET_DEFAULT(PrefetchScanIntervalInBytes, 256); 120 FLAG_SET_DEFAULT(PrefetchFieldsAhead, 256); 121 FLAG_SET_DEFAULT(PrefetchCopyIntervalInBytes, 256); 122 FLAG_SET_DEFAULT(UseSSE42Intrinsics, true); 123 124 unsigned long auxv = getauxval(AT_HWCAP); 125 126 char buf[512]; 127 128 _cpuFeatures = auxv; 129 130 int cpu_lines = 0; 131 if (FILE *f = fopen("/proc/cpuinfo", "r")) { 132 char buf[128], *p; 133 while (fgets(buf, sizeof (buf), f) != NULL) { 134 if (p = strchr(buf, ':')) { 135 long v = strtol(p+1, NULL, 0); 136 if (strncmp(buf, "CPU implementer", sizeof "CPU implementer" - 1) == 0) { 137 _cpu = v; 138 cpu_lines++; 139 } else if (strncmp(buf, "CPU variant", sizeof "CPU variant" - 1) == 0) { 140 _variant = v; 141 } else if (strncmp(buf, "CPU part", sizeof "CPU part" - 1) == 0) { 142 if (_model != v) _model2 = _model; 143 _model = v; 144 } else if (strncmp(buf, "CPU revision", sizeof "CPU revision" - 1) == 0) { 145 _revision = v; 146 } 147 } 148 } 149 fclose(f); 150 } 151 152 // Enable vendor specific features 153 if (_cpu == CPU_CAVIUM && _variant == 0) _cpuFeatures |= CPU_DMB_ATOMICS; 154 if (_cpu == CPU_ARM && (_model == 0xd03 || _model2 == 0xd03)) _cpuFeatures |= CPU_A53MAC; 155 // If an olde style /proc/cpuinfo (cpu_lines == 1) then if _model is an A57 (0xd07) 156 // we assume the worst and assume we could be on a big little system and have 157 // undisclosed A53 cores which we could be swapped to at any stage 158 if (_cpu == CPU_ARM && cpu_lines == 1 && _model == 0xd07) _cpuFeatures |= CPU_A53MAC; 159 160 sprintf(buf, "0x%02x:0x%x:0x%03x:%d", _cpu, _variant, _model, _revision); 161 if (_model2) sprintf(buf+strlen(buf), "(0x%03x)", _model2); 162 if (auxv & HWCAP_ASIMD) strcat(buf, ", simd"); 163 if (auxv & HWCAP_CRC32) strcat(buf, ", crc"); 164 if (auxv & HWCAP_AES) strcat(buf, ", aes"); 165 if (auxv & HWCAP_SHA1) strcat(buf, ", sha1"); 166 if (auxv & HWCAP_SHA2) strcat(buf, ", sha256"); 167 168 _features_str = os::strdup(buf); 169 170 if (FLAG_IS_DEFAULT(UseCRC32)) { 171 UseCRC32 = (auxv & HWCAP_CRC32) != 0; 172 } 173 if (UseCRC32 && (auxv & HWCAP_CRC32) == 0) { 174 warning("UseCRC32 specified, but not supported on this CPU"); 175 } 176 if (auxv & HWCAP_AES) { 177 UseAES = UseAES || FLAG_IS_DEFAULT(UseAES); 178 UseAESIntrinsics = 179 UseAESIntrinsics || (UseAES && FLAG_IS_DEFAULT(UseAESIntrinsics)); 180 if (UseAESIntrinsics && !UseAES) { 181 warning("UseAESIntrinsics enabled, but UseAES not, enabling"); 182 UseAES = true; 183 } 184 } else { 185 if (UseAES) { 186 warning("UseAES specified, but not supported on this CPU"); 187 } 188 if (UseAESIntrinsics) { 189 warning("UseAESIntrinsics specified, but not supported on this CPU"); 190 } 191 } 192 193 if (UseGHASHIntrinsics) { 194 warning("GHASH intrinsics are not available on this CPU"); 195 FLAG_SET_DEFAULT(UseGHASHIntrinsics, false); 196 } 197 198 if (FLAG_IS_DEFAULT(UseCRC32Intrinsics)) { 199 UseCRC32Intrinsics = true; 200 } 201 202 if (auxv & (HWCAP_SHA1 | HWCAP_SHA2)) { 203 if (FLAG_IS_DEFAULT(UseSHA)) { 204 FLAG_SET_DEFAULT(UseSHA, true); 205 } 206 } else if (UseSHA) { 207 warning("SHA instructions are not available on this CPU"); 208 FLAG_SET_DEFAULT(UseSHA, false); 209 } 210 211 if (!UseSHA) { 212 FLAG_SET_DEFAULT(UseSHA1Intrinsics, false); 213 FLAG_SET_DEFAULT(UseSHA256Intrinsics, false); 214 FLAG_SET_DEFAULT(UseSHA512Intrinsics, false); 215 } else { 216 if (auxv & HWCAP_SHA1) { 217 if (FLAG_IS_DEFAULT(UseSHA1Intrinsics)) { 218 FLAG_SET_DEFAULT(UseSHA1Intrinsics, true); 219 } 220 } else if (UseSHA1Intrinsics) { 221 warning("SHA1 instruction is not available on this CPU."); 222 FLAG_SET_DEFAULT(UseSHA1Intrinsics, false); 223 } 224 if (auxv & HWCAP_SHA2) { 225 if (FLAG_IS_DEFAULT(UseSHA256Intrinsics)) { 226 FLAG_SET_DEFAULT(UseSHA256Intrinsics, true); 227 } 228 } else if (UseSHA256Intrinsics) { 229 warning("SHA256 instruction (for SHA-224 and SHA-256) is not available on this CPU."); 230 FLAG_SET_DEFAULT(UseSHA256Intrinsics, false); 231 } 232 if (UseSHA512Intrinsics) { 233 warning("SHA512 instruction (for SHA-384 and SHA-512) is not available on this CPU."); 234 FLAG_SET_DEFAULT(UseSHA512Intrinsics, false); 235 } 236 if (!(UseSHA1Intrinsics || UseSHA256Intrinsics || UseSHA512Intrinsics)) { 237 FLAG_SET_DEFAULT(UseSHA, false); 238 } 239 } 240 241 // This machine allows unaligned memory accesses 242 if (FLAG_IS_DEFAULT(UseUnalignedAccesses)) { 243 FLAG_SET_DEFAULT(UseUnalignedAccesses, true); 244 } 245 246 if (FLAG_IS_DEFAULT(UseMultiplyToLenIntrinsic)) { 247 UseMultiplyToLenIntrinsic = true; 248 } 249 250 if (FLAG_IS_DEFAULT(UseBarriersForVolatile)) { 251 UseBarriersForVolatile = (_cpuFeatures & CPU_DMB_ATOMICS) != 0; 252 } 253 254 if (FLAG_IS_DEFAULT(UsePopCountInstruction)) { 255 UsePopCountInstruction = true; 256 } 257 258 #ifdef COMPILER2 259 if (FLAG_IS_DEFAULT(OptoScheduling)) { 260 OptoScheduling = true; 261 } 262 #endif 263 } 264 265 void VM_Version::initialize() { 266 ResourceMark rm; 267 268 stub_blob = BufferBlob::create("getPsrInfo_stub", stub_size); 269 if (stub_blob == NULL) { 270 vm_exit_during_initialization("Unable to allocate getPsrInfo_stub"); 271 } 272 273 CodeBuffer c(stub_blob); 274 VM_Version_StubGenerator g(&c); 275 getPsrInfo_stub = CAST_TO_FN_PTR(getPsrInfo_stub_t, 276 g.generate_getPsrInfo()); 277 278 get_processor_features(); 279 }