456 __ pop(rbx);
457 __ pop(rbp);
458 __ ret(0);
459
460 # undef __
461
462 return start;
463 };
464 };
465
466 void VM_Version::get_processor_features() {
467
468 _cpu = 4; // 486 by default
469 _model = 0;
470 _stepping = 0;
471 _cpuFeatures = 0;
472 _logical_processors_per_package = 1;
473 // i486 internal cache is both I&D and has a 16-byte line size
474 _L1_data_cache_line_size = 16;
475
476 if (!Use486InstrsOnly) {
477 // Get raw processor info
478
479 get_cpu_info_stub(&_cpuid_info);
480
481 assert_is_initialized();
482 _cpu = extended_cpu_family();
483 _model = extended_cpu_model();
484 _stepping = cpu_stepping();
485
486 if (cpu_family() > 4) { // it supports CPUID
487 _cpuFeatures = feature_flags();
488 // Logical processors are only available on P4s and above,
489 // and only if hyperthreading is available.
490 _logical_processors_per_package = logical_processor_count();
491 _L1_data_cache_line_size = L1_line_size();
492 }
493 }
494
495 _supports_cx8 = supports_cmpxchg8();
496 // xchg and xadd instructions
497 _supports_atomic_getset4 = true;
498 _supports_atomic_getadd4 = true;
499 LP64_ONLY(_supports_atomic_getset8 = true);
500 LP64_ONLY(_supports_atomic_getadd8 = true);
501
502 #ifdef _LP64
503 // OS should support SSE for x64 and hardware should support at least SSE2.
504 if (!VM_Version::supports_sse2()) {
505 vm_exit_during_initialization("Unknown x64 processor: SSE2 not supported");
506 }
507 // in 64 bit the use of SSE2 is the minimum
508 if (UseSSE < 2) UseSSE = 2;
509 #endif
510
511 #ifdef AMD64
512 // flush_icache_stub have to be generated first.
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456 __ pop(rbx);
457 __ pop(rbp);
458 __ ret(0);
459
460 # undef __
461
462 return start;
463 };
464 };
465
466 void VM_Version::get_processor_features() {
467
468 _cpu = 4; // 486 by default
469 _model = 0;
470 _stepping = 0;
471 _cpuFeatures = 0;
472 _logical_processors_per_package = 1;
473 // i486 internal cache is both I&D and has a 16-byte line size
474 _L1_data_cache_line_size = 16;
475
476 // Get raw processor info
477
478 get_cpu_info_stub(&_cpuid_info);
479
480 assert_is_initialized();
481 _cpu = extended_cpu_family();
482 _model = extended_cpu_model();
483 _stepping = cpu_stepping();
484
485 if (cpu_family() > 4) { // it supports CPUID
486 _cpuFeatures = feature_flags();
487 // Logical processors are only available on P4s and above,
488 // and only if hyperthreading is available.
489 _logical_processors_per_package = logical_processor_count();
490 _L1_data_cache_line_size = L1_line_size();
491 }
492
493 _supports_cx8 = supports_cmpxchg8();
494 // xchg and xadd instructions
495 _supports_atomic_getset4 = true;
496 _supports_atomic_getadd4 = true;
497 LP64_ONLY(_supports_atomic_getset8 = true);
498 LP64_ONLY(_supports_atomic_getadd8 = true);
499
500 #ifdef _LP64
501 // OS should support SSE for x64 and hardware should support at least SSE2.
502 if (!VM_Version::supports_sse2()) {
503 vm_exit_during_initialization("Unknown x64 processor: SSE2 not supported");
504 }
505 // in 64 bit the use of SSE2 is the minimum
506 if (UseSSE < 2) UseSSE = 2;
507 #endif
508
509 #ifdef AMD64
510 // flush_icache_stub have to be generated first.
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