/*

 * Copyright (c) 1997, 2011, Oracle and/or its affiliates.  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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#include "precompiled.hpp"

#include "assembler_x86.inline.hpp"

#include "memory/resourceArea.hpp"

#include "runtime/java.hpp"

#include "runtime/stubCodeGenerator.hpp"

#include "vm_version_x86.hpp"

#ifdef TARGET_OS_FAMILY_linux

# include "os_linux.inline.hpp"

#endif

#ifdef TARGET_OS_FAMILY_solaris

# include "os_solaris.inline.hpp"

#endif

#ifdef TARGET_OS_FAMILY_windows

# include "os_windows.inline.hpp"

#endif

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 = 400;

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, std_cpuid4;

    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, 0xa);                  // Is cpuid(0xB) supported?

    __ jccb(Assembler::belowEqual, std_cpuid4);

    //

    // cpuid(0xB) Processor Topology

    //

    __ movl(rax, 0xb);

    __ xorl(rcx, rcx);   // Threads level

    __ cpuid();

    __ lea(rsi, Address(rbp, in_bytes(VM_Version::tpl_cpuidB0_offset())));

    __ movl(Address(rsi, 0), rax);

    __ movl(Address(rsi, 4), rbx);

    __ movl(Address(rsi, 8), rcx);

    __ movl(Address(rsi,12), rdx);

    __ movl(rax, 0xb);

    __ movl(rcx, 1);     // Cores level

    __ cpuid();

    __ push(rax);

    __ andl(rax, 0x1f);  // Determine if valid topology level

    __ orl(rax, rbx);    // eax[4:0] | ebx[0:15] == 0 indicates invalid level

    __ andl(rax, 0xffff);

    __ pop(rax);

    __ jccb(Assembler::equal, std_cpuid4);

    __ lea(rsi, Address(rbp, in_bytes(VM_Version::tpl_cpuidB1_offset())));

    __ movl(Address(rsi, 0), rax);

    __ movl(Address(rsi, 4), rbx);

    __ movl(Address(rsi, 8), rcx);

    __ movl(Address(rsi,12), rdx);

    __ movl(rax, 0xb);

    __ movl(rcx, 2);     // Packages level

    __ cpuid();

    __ push(rax);

    __ andl(rax, 0x1f);  // Determine if valid topology level

    __ orl(rax, rbx);    // eax[4:0] | ebx[0:15] == 0 indicates invalid level

    __ andl(rax, 0xffff);

    __ pop(rax);

    __ jccb(Assembler::equal, std_cpuid4);

    __ lea(rsi, Address(rbp, in_bytes(VM_Version::tpl_cpuidB2_offset())));

    __ movl(Address(rsi, 0), rax);

    __ movl(Address(rsi, 4), rbx);

    __ movl(Address(rsi, 8), rcx);

    __ movl(Address(rsi,12), rdx);

    //

    // cpuid(0x4) Deterministic cache params

    //

    __ bind(std_cpuid4);

    __ movl(rax, 4);

    __ cmpl(rax, Address(rbp, in_bytes(VM_Version::std_cpuid0_offset()))); // Is cpuid(0x4) supported?

    __ jccb(Assembler::greater, std_cpuid1);

    __ 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");

  }

  // in 64 bit the use of SSE2 is the minimum

  if (UseSSE < 2) UseSSE = 2;

#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];

               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_popcnt() ? ", popcnt" : ""),

               (supports_mmx_ext() ? ", mmxext" : ""),

               (supports_lzcnt()   ? ", lzcnt": ""),

               (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( FLAG_IS_DEFAULT(UseSSE42Intrinsics) ) {

      if( supports_sse4_2() && UseSSE >= 4 ) {

        UseSSE42Intrinsics = true;

      }

    }

    // Use count leading zeros count instruction if available.

    if (supports_lzcnt()) {

      if (FLAG_IS_DEFAULT(UseCountLeadingZerosInstruction)) {

        UseCountLeadingZerosInstruction = true;

      }

    }

    // On family 21 processors default is no sw prefetch

    if ( cpu_family() == 21 ) {

      if (FLAG_IS_DEFAULT(AllocatePrefetchStyle)) {

        AllocatePrefetchStyle = 0;

      }

    }

  }

  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

        }

      }

      if( supports_sse4_2() && UseSSE >= 4 ) {

        if( FLAG_IS_DEFAULT(UseSSE42Intrinsics)) {

          UseSSE42Intrinsics = true;

        }

      }

    }

  }

  // Use population count instruction if available.

  if (supports_popcnt()) {

    if (FLAG_IS_DEFAULT(UsePopCountInstruction)) {

      UsePopCountInstruction = true;

    }

  }

#ifdef COMPILER2

  if (UseFPUForSpilling) {

    if (UseSSE < 2) {

      // Only supported with SSE2+

      FLAG_SET_DEFAULT(UseFPUForSpilling, false);

    }

  }

#endif

  assert(0 <= ReadPrefetchInstr && ReadPrefetchInstr <= 3, "invalid value");