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comparison src/cpu/x86/vm/vm_version_x86.hpp @ 1647:079980c86f33

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6968646: JVM crashes with SIGFPE during startup Summary: Check that cpuid returns valid values for processor topology (not zeros). Reviewed-by: never, twisti
author kvn
date Wed, 14 Jul 2010 14:29:14 -0700
parents 76efbe666d6c
children a83b0246bb77
comparison
equal deleted inserted replaced
1646:8d5934a77f10 1647:079980c86f33
374 static bool is_P6() { return cpu_family() >= 6; } 374 static bool is_P6() { return cpu_family() >= 6; }
375 375
376 static bool is_amd() { assert_is_initialized(); return _cpuid_info.std_vendor_name_0 == 0x68747541; } // 'htuA' 376 static bool is_amd() { assert_is_initialized(); return _cpuid_info.std_vendor_name_0 == 0x68747541; } // 'htuA'
377 static bool is_intel() { assert_is_initialized(); return _cpuid_info.std_vendor_name_0 == 0x756e6547; } // 'uneG' 377 static bool is_intel() { assert_is_initialized(); return _cpuid_info.std_vendor_name_0 == 0x756e6547; } // 'uneG'
378 378
379 static bool supports_processor_topology() {
380 return (_cpuid_info.std_max_function >= 0xB) &&
381 // eax[4:0] | ebx[0:15] == 0 indicates invalid topology level.
382 // Some cpus have max cpuid >= 0xB but do not support processor topology.
383 ((_cpuid_info.tpl_cpuidB0_eax & 0x1f | _cpuid_info.tpl_cpuidB0_ebx.bits.logical_cpus) != 0);
384 }
385
379 static uint cores_per_cpu() { 386 static uint cores_per_cpu() {
380 uint result = 1; 387 uint result = 1;
381 if (is_intel()) { 388 if (is_intel()) {
382 if (_cpuid_info.std_max_function >= 0xB) { 389 if (supports_processor_topology()) {
383 result = _cpuid_info.tpl_cpuidB1_ebx.bits.logical_cpus / 390 result = _cpuid_info.tpl_cpuidB1_ebx.bits.logical_cpus /
384 _cpuid_info.tpl_cpuidB0_ebx.bits.logical_cpus; 391 _cpuid_info.tpl_cpuidB0_ebx.bits.logical_cpus;
385 } else { 392 } else {
386 result = (_cpuid_info.dcp_cpuid4_eax.bits.cores_per_cpu + 1); 393 result = (_cpuid_info.dcp_cpuid4_eax.bits.cores_per_cpu + 1);
387 } 394 }
391 return result; 398 return result;
392 } 399 }
393 400
394 static uint threads_per_core() { 401 static uint threads_per_core() {
395 uint result = 1; 402 uint result = 1;
396 if (is_intel() && _cpuid_info.std_max_function >= 0xB) { 403 if (is_intel() && supports_processor_topology()) {
397 result = _cpuid_info.tpl_cpuidB0_ebx.bits.logical_cpus; 404 result = _cpuid_info.tpl_cpuidB0_ebx.bits.logical_cpus;
398 } else if (_cpuid_info.std_cpuid1_edx.bits.ht != 0) { 405 } else if (_cpuid_info.std_cpuid1_edx.bits.ht != 0) {
399 result = _cpuid_info.std_cpuid1_ebx.bits.threads_per_cpu / 406 result = _cpuid_info.std_cpuid1_ebx.bits.threads_per_cpu /
400 cores_per_cpu(); 407 cores_per_cpu();
401 } 408 }