diff -r 40e42c95ac39 -r dab8a43dd738 hotspot/src/cpu/x86/vm/vm_version_x86.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/hotspot/src/cpu/x86/vm/vm_version_x86.cpp Mon Feb 23 12:02:30 2009 -0800 @@ -0,0 +1,514 @@ +/* + * Copyright 1997-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +# include "incls/_precompiled.incl" +# include "incls/_vm_version_x86.cpp.incl" + + +int VM_Version::_cpu; +int VM_Version::_model; +int VM_Version::_stepping; +int VM_Version::_cpuFeatures; +const char* VM_Version::_features_str = ""; +VM_Version::CpuidInfo VM_Version::_cpuid_info = { 0, }; + +static BufferBlob* stub_blob; +static const int stub_size = 300; + +extern "C" { + typedef void (*getPsrInfo_stub_t)(void*); +} +static getPsrInfo_stub_t getPsrInfo_stub = NULL; + + +class VM_Version_StubGenerator: public StubCodeGenerator { + public: + + VM_Version_StubGenerator(CodeBuffer *c) : StubCodeGenerator(c) {} + + address generate_getPsrInfo() { + // Flags to test CPU type. + const uint32_t EFL_AC = 0x40000; + const uint32_t EFL_ID = 0x200000; + // Values for when we don't have a CPUID instruction. + const int CPU_FAMILY_SHIFT = 8; + const uint32_t CPU_FAMILY_386 = (3 << CPU_FAMILY_SHIFT); + const uint32_t CPU_FAMILY_486 = (4 << CPU_FAMILY_SHIFT); + + Label detect_486, cpu486, detect_586, std_cpuid1; + Label ext_cpuid1, ext_cpuid5, done; + + StubCodeMark mark(this, "VM_Version", "getPsrInfo_stub"); +# define __ _masm-> + + address start = __ pc(); + + // + // void getPsrInfo(VM_Version::CpuidInfo* cpuid_info); + // + // LP64: rcx and rdx are first and second argument registers on windows + + __ push(rbp); +#ifdef _LP64 + __ mov(rbp, c_rarg0); // cpuid_info address +#else + __ movptr(rbp, Address(rsp, 8)); // cpuid_info address +#endif + __ push(rbx); + __ push(rsi); + __ pushf(); // preserve rbx, and flags + __ pop(rax); + __ push(rax); + __ mov(rcx, rax); + // + // if we are unable to change the AC flag, we have a 386 + // + __ xorl(rax, EFL_AC); + __ push(rax); + __ popf(); + __ pushf(); + __ pop(rax); + __ cmpptr(rax, rcx); + __ jccb(Assembler::notEqual, detect_486); + + __ movl(rax, CPU_FAMILY_386); + __ movl(Address(rbp, in_bytes(VM_Version::std_cpuid1_offset())), rax); + __ jmp(done); + + // + // If we are unable to change the ID flag, we have a 486 which does + // not support the "cpuid" instruction. + // + __ bind(detect_486); + __ mov(rax, rcx); + __ xorl(rax, EFL_ID); + __ push(rax); + __ popf(); + __ pushf(); + __ pop(rax); + __ cmpptr(rcx, rax); + __ jccb(Assembler::notEqual, detect_586); + + __ bind(cpu486); + __ movl(rax, CPU_FAMILY_486); + __ movl(Address(rbp, in_bytes(VM_Version::std_cpuid1_offset())), rax); + __ jmp(done); + + // + // At this point, we have a chip which supports the "cpuid" instruction + // + __ bind(detect_586); + __ xorl(rax, rax); + __ cpuid(); + __ orl(rax, rax); + __ jcc(Assembler::equal, cpu486); // if cpuid doesn't support an input + // value of at least 1, we give up and + // assume a 486 + __ lea(rsi, Address(rbp, in_bytes(VM_Version::std_cpuid0_offset()))); + __ movl(Address(rsi, 0), rax); + __ movl(Address(rsi, 4), rbx); + __ movl(Address(rsi, 8), rcx); + __ movl(Address(rsi,12), rdx); + + __ cmpl(rax, 3); // Is cpuid(0x4) supported? + __ jccb(Assembler::belowEqual, std_cpuid1); + + // + // cpuid(0x4) Deterministic cache params + // + __ movl(rax, 4); + __ xorl(rcx, rcx); // L1 cache + __ cpuid(); + __ push(rax); + __ andl(rax, 0x1f); // Determine if valid cache parameters used + __ orl(rax, rax); // eax[4:0] == 0 indicates invalid cache + __ pop(rax); + __ jccb(Assembler::equal, std_cpuid1); + + __ lea(rsi, Address(rbp, in_bytes(VM_Version::dcp_cpuid4_offset()))); + __ movl(Address(rsi, 0), rax); + __ movl(Address(rsi, 4), rbx); + __ movl(Address(rsi, 8), rcx); + __ movl(Address(rsi,12), rdx); + + // + // Standard cpuid(0x1) + // + __ bind(std_cpuid1); + __ movl(rax, 1); + __ cpuid(); + __ lea(rsi, Address(rbp, in_bytes(VM_Version::std_cpuid1_offset()))); + __ movl(Address(rsi, 0), rax); + __ movl(Address(rsi, 4), rbx); + __ movl(Address(rsi, 8), rcx); + __ movl(Address(rsi,12), rdx); + + __ movl(rax, 0x80000000); + __ cpuid(); + __ cmpl(rax, 0x80000000); // Is cpuid(0x80000001) supported? + __ jcc(Assembler::belowEqual, done); + __ cmpl(rax, 0x80000004); // Is cpuid(0x80000005) supported? + __ jccb(Assembler::belowEqual, ext_cpuid1); + __ cmpl(rax, 0x80000007); // Is cpuid(0x80000008) supported? + __ jccb(Assembler::belowEqual, ext_cpuid5); + // + // Extended cpuid(0x80000008) + // + __ movl(rax, 0x80000008); + __ cpuid(); + __ lea(rsi, Address(rbp, in_bytes(VM_Version::ext_cpuid8_offset()))); + __ movl(Address(rsi, 0), rax); + __ movl(Address(rsi, 4), rbx); + __ movl(Address(rsi, 8), rcx); + __ movl(Address(rsi,12), rdx); + + // + // Extended cpuid(0x80000005) + // + __ bind(ext_cpuid5); + __ movl(rax, 0x80000005); + __ cpuid(); + __ lea(rsi, Address(rbp, in_bytes(VM_Version::ext_cpuid5_offset()))); + __ movl(Address(rsi, 0), rax); + __ movl(Address(rsi, 4), rbx); + __ movl(Address(rsi, 8), rcx); + __ movl(Address(rsi,12), rdx); + + // + // Extended cpuid(0x80000001) + // + __ bind(ext_cpuid1); + __ movl(rax, 0x80000001); + __ cpuid(); + __ lea(rsi, Address(rbp, in_bytes(VM_Version::ext_cpuid1_offset()))); + __ movl(Address(rsi, 0), rax); + __ movl(Address(rsi, 4), rbx); + __ movl(Address(rsi, 8), rcx); + __ movl(Address(rsi,12), rdx); + + // + // return + // + __ bind(done); + __ popf(); + __ pop(rsi); + __ pop(rbx); + __ pop(rbp); + __ ret(0); + +# undef __ + + return start; + }; +}; + + +void VM_Version::get_processor_features() { + + _cpu = 4; // 486 by default + _model = 0; + _stepping = 0; + _cpuFeatures = 0; + _logical_processors_per_package = 1; + + if (!Use486InstrsOnly) { + // Get raw processor info + getPsrInfo_stub(&_cpuid_info); + assert_is_initialized(); + _cpu = extended_cpu_family(); + _model = extended_cpu_model(); + _stepping = cpu_stepping(); + + if (cpu_family() > 4) { // it supports CPUID + _cpuFeatures = feature_flags(); + // Logical processors are only available on P4s and above, + // and only if hyperthreading is available. + _logical_processors_per_package = logical_processor_count(); + } + } + + _supports_cx8 = supports_cmpxchg8(); + +#ifdef _LP64 + // OS should support SSE for x64 and hardware should support at least SSE2. + if (!VM_Version::supports_sse2()) { + vm_exit_during_initialization("Unknown x64 processor: SSE2 not supported"); + } +#endif + + // If the OS doesn't support SSE, we can't use this feature even if the HW does + if (!os::supports_sse()) + _cpuFeatures &= ~(CPU_SSE|CPU_SSE2|CPU_SSE3|CPU_SSSE3|CPU_SSE4A|CPU_SSE4_1|CPU_SSE4_2); + + if (UseSSE < 4) { + _cpuFeatures &= ~CPU_SSE4_1; + _cpuFeatures &= ~CPU_SSE4_2; + } + + if (UseSSE < 3) { + _cpuFeatures &= ~CPU_SSE3; + _cpuFeatures &= ~CPU_SSSE3; + _cpuFeatures &= ~CPU_SSE4A; + } + + if (UseSSE < 2) + _cpuFeatures &= ~CPU_SSE2; + + if (UseSSE < 1) + _cpuFeatures &= ~CPU_SSE; + + if (logical_processors_per_package() == 1) { + // HT processor could be installed on a system which doesn't support HT. + _cpuFeatures &= ~CPU_HT; + } + + char buf[256]; + jio_snprintf(buf, sizeof(buf), "(%u cores per cpu, %u threads per core) family %d model %d stepping %d%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s", + cores_per_cpu(), threads_per_core(), + cpu_family(), _model, _stepping, + (supports_cmov() ? ", cmov" : ""), + (supports_cmpxchg8() ? ", cx8" : ""), + (supports_fxsr() ? ", fxsr" : ""), + (supports_mmx() ? ", mmx" : ""), + (supports_sse() ? ", sse" : ""), + (supports_sse2() ? ", sse2" : ""), + (supports_sse3() ? ", sse3" : ""), + (supports_ssse3()? ", ssse3": ""), + (supports_sse4_1() ? ", sse4.1" : ""), + (supports_sse4_2() ? ", sse4.2" : ""), + (supports_mmx_ext() ? ", mmxext" : ""), + (supports_3dnow() ? ", 3dnow" : ""), + (supports_3dnow2() ? ", 3dnowext" : ""), + (supports_sse4a() ? ", sse4a": ""), + (supports_ht() ? ", ht": "")); + _features_str = strdup(buf); + + // UseSSE is set to the smaller of what hardware supports and what + // the command line requires. I.e., you cannot set UseSSE to 2 on + // older Pentiums which do not support it. + if( UseSSE > 4 ) UseSSE=4; + if( UseSSE < 0 ) UseSSE=0; + if( !supports_sse4_1() ) // Drop to 3 if no SSE4 support + UseSSE = MIN2((intx)3,UseSSE); + if( !supports_sse3() ) // Drop to 2 if no SSE3 support + UseSSE = MIN2((intx)2,UseSSE); + if( !supports_sse2() ) // Drop to 1 if no SSE2 support + UseSSE = MIN2((intx)1,UseSSE); + if( !supports_sse () ) // Drop to 0 if no SSE support + UseSSE = 0; + + // On new cpus instructions which update whole XMM register should be used + // to prevent partial register stall due to dependencies on high half. + // + // UseXmmLoadAndClearUpper == true --> movsd(xmm, mem) + // UseXmmLoadAndClearUpper == false --> movlpd(xmm, mem) + // UseXmmRegToRegMoveAll == true --> movaps(xmm, xmm), movapd(xmm, xmm). + // UseXmmRegToRegMoveAll == false --> movss(xmm, xmm), movsd(xmm, xmm). + + if( is_amd() ) { // AMD cpus specific settings + if( supports_sse2() && FLAG_IS_DEFAULT(UseAddressNop) ) { + // Use it on new AMD cpus starting from Opteron. + UseAddressNop = true; + } + if( supports_sse2() && FLAG_IS_DEFAULT(UseNewLongLShift) ) { + // Use it on new AMD cpus starting from Opteron. + UseNewLongLShift = true; + } + if( FLAG_IS_DEFAULT(UseXmmLoadAndClearUpper) ) { + if( supports_sse4a() ) { + UseXmmLoadAndClearUpper = true; // use movsd only on '10h' Opteron + } else { + UseXmmLoadAndClearUpper = false; + } + } + if( FLAG_IS_DEFAULT(UseXmmRegToRegMoveAll) ) { + if( supports_sse4a() ) { + UseXmmRegToRegMoveAll = true; // use movaps, movapd only on '10h' + } else { + UseXmmRegToRegMoveAll = false; + } + } + if( FLAG_IS_DEFAULT(UseXmmI2F) ) { + if( supports_sse4a() ) { + UseXmmI2F = true; + } else { + UseXmmI2F = false; + } + } + if( FLAG_IS_DEFAULT(UseXmmI2D) ) { + if( supports_sse4a() ) { + UseXmmI2D = true; + } else { + UseXmmI2D = false; + } + } + } + + if( is_intel() ) { // Intel cpus specific settings + if( FLAG_IS_DEFAULT(UseStoreImmI16) ) { + UseStoreImmI16 = false; // don't use it on Intel cpus + } + if( cpu_family() == 6 || cpu_family() == 15 ) { + if( FLAG_IS_DEFAULT(UseAddressNop) ) { + // Use it on all Intel cpus starting from PentiumPro + UseAddressNop = true; + } + } + if( FLAG_IS_DEFAULT(UseXmmLoadAndClearUpper) ) { + UseXmmLoadAndClearUpper = true; // use movsd on all Intel cpus + } + if( FLAG_IS_DEFAULT(UseXmmRegToRegMoveAll) ) { + if( supports_sse3() ) { + UseXmmRegToRegMoveAll = true; // use movaps, movapd on new Intel cpus + } else { + UseXmmRegToRegMoveAll = false; + } + } + if( cpu_family() == 6 && supports_sse3() ) { // New Intel cpus +#ifdef COMPILER2 + if( FLAG_IS_DEFAULT(MaxLoopPad) ) { + // For new Intel cpus do the next optimization: + // don't align the beginning of a loop if there are enough instructions + // left (NumberOfLoopInstrToAlign defined in c2_globals.hpp) + // in current fetch line (OptoLoopAlignment) or the padding + // is big (> MaxLoopPad). + // Set MaxLoopPad to 11 for new Intel cpus to reduce number of + // generated NOP instructions. 11 is the largest size of one + // address NOP instruction '0F 1F' (see Assembler::nop(i)). + MaxLoopPad = 11; + } +#endif // COMPILER2 + if( FLAG_IS_DEFAULT(UseXMMForArrayCopy) ) { + UseXMMForArrayCopy = true; // use SSE2 movq on new Intel cpus + } + if( supports_sse4_2() && supports_ht() ) { // Newest Intel cpus + if( FLAG_IS_DEFAULT(UseUnalignedLoadStores) && UseXMMForArrayCopy ) { + UseUnalignedLoadStores = true; // use movdqu on newest Intel cpus + } + } + } + } + + assert(0 <= ReadPrefetchInstr && ReadPrefetchInstr <= 3, "invalid value"); + assert(0 <= AllocatePrefetchInstr && AllocatePrefetchInstr <= 3, "invalid value"); + + // set valid Prefetch instruction + if( ReadPrefetchInstr < 0 ) ReadPrefetchInstr = 0; + if( ReadPrefetchInstr > 3 ) ReadPrefetchInstr = 3; + if( ReadPrefetchInstr == 3 && !supports_3dnow() ) ReadPrefetchInstr = 0; + if( !supports_sse() && supports_3dnow() ) ReadPrefetchInstr = 3; + + if( AllocatePrefetchInstr < 0 ) AllocatePrefetchInstr = 0; + if( AllocatePrefetchInstr > 3 ) AllocatePrefetchInstr = 3; + if( AllocatePrefetchInstr == 3 && !supports_3dnow() ) AllocatePrefetchInstr=0; + if( !supports_sse() && supports_3dnow() ) AllocatePrefetchInstr = 3; + + // Allocation prefetch settings + intx cache_line_size = L1_data_cache_line_size(); + if( cache_line_size > AllocatePrefetchStepSize ) + AllocatePrefetchStepSize = cache_line_size; + if( FLAG_IS_DEFAULT(AllocatePrefetchLines) ) + AllocatePrefetchLines = 3; // Optimistic value + assert(AllocatePrefetchLines > 0, "invalid value"); + if( AllocatePrefetchLines < 1 ) // set valid value in product VM + AllocatePrefetchLines = 1; // Conservative value + + AllocatePrefetchDistance = allocate_prefetch_distance(); + AllocatePrefetchStyle = allocate_prefetch_style(); + + if( AllocatePrefetchStyle == 2 && is_intel() && + cpu_family() == 6 && supports_sse3() ) { // watermark prefetching on Core +#ifdef _LP64 + AllocatePrefetchDistance = 384; +#else + AllocatePrefetchDistance = 320; +#endif + } + assert(AllocatePrefetchDistance % AllocatePrefetchStepSize == 0, "invalid value"); + +#ifdef _LP64 + // Prefetch settings + PrefetchCopyIntervalInBytes = prefetch_copy_interval_in_bytes(); + PrefetchScanIntervalInBytes = prefetch_scan_interval_in_bytes(); + PrefetchFieldsAhead = prefetch_fields_ahead(); +#endif + +#ifndef PRODUCT + if (PrintMiscellaneous && Verbose) { + tty->print_cr("Logical CPUs per core: %u", + logical_processors_per_package()); + tty->print_cr("UseSSE=%d",UseSSE); + tty->print("Allocation: "); + if (AllocatePrefetchStyle <= 0 || UseSSE == 0 && !supports_3dnow()) { + tty->print_cr("no prefetching"); + } else { + if (UseSSE == 0 && supports_3dnow()) { + tty->print("PREFETCHW"); + } else if (UseSSE >= 1) { + if (AllocatePrefetchInstr == 0) { + tty->print("PREFETCHNTA"); + } else if (AllocatePrefetchInstr == 1) { + tty->print("PREFETCHT0"); + } else if (AllocatePrefetchInstr == 2) { + tty->print("PREFETCHT2"); + } else if (AllocatePrefetchInstr == 3) { + tty->print("PREFETCHW"); + } + } + if (AllocatePrefetchLines > 1) { + tty->print_cr(" %d, %d lines with step %d bytes", AllocatePrefetchDistance, AllocatePrefetchLines, AllocatePrefetchStepSize); + } else { + tty->print_cr(" %d, one line", AllocatePrefetchDistance); + } + } + + if (PrefetchCopyIntervalInBytes > 0) { + tty->print_cr("PrefetchCopyIntervalInBytes %d", PrefetchCopyIntervalInBytes); + } + if (PrefetchScanIntervalInBytes > 0) { + tty->print_cr("PrefetchScanIntervalInBytes %d", PrefetchScanIntervalInBytes); + } + if (PrefetchFieldsAhead > 0) { + tty->print_cr("PrefetchFieldsAhead %d", PrefetchFieldsAhead); + } + } +#endif // !PRODUCT +} + +void VM_Version::initialize() { + ResourceMark rm; + // Making this stub must be FIRST use of assembler + + stub_blob = BufferBlob::create("getPsrInfo_stub", stub_size); + if (stub_blob == NULL) { + vm_exit_during_initialization("Unable to allocate getPsrInfo_stub"); + } + CodeBuffer c(stub_blob->instructions_begin(), + stub_blob->instructions_size()); + VM_Version_StubGenerator g(&c); + getPsrInfo_stub = CAST_TO_FN_PTR(getPsrInfo_stub_t, + g.generate_getPsrInfo()); + + get_processor_features(); +}