/*

 * Copyright (c) 2008, 2017, 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 "asm/macroAssembler.inline.hpp"

#include "memory/resourceArea.hpp"

#include "runtime/java.hpp"

#include "runtime/os.inline.hpp"

#include "runtime/stubCodeGenerator.hpp"

#include "vm_version_arm.hpp"

#include <sys/auxv.h>

#include <asm/hwcap.h>

#ifndef HWCAP_AES

#define HWCAP_AES 1 << 3

#endif

bool VM_Version::_is_initialized = false;

bool VM_Version::_has_simd = false;

extern "C" {

  typedef bool (*check_simd_t)();

}

#ifdef COMPILER2

#define __ _masm->

class VM_Version_StubGenerator: public StubCodeGenerator {

 public:

  VM_Version_StubGenerator(CodeBuffer *c) : StubCodeGenerator(c) {}

  address generate_check_simd() {

    StubCodeMark mark(this, "VM_Version", "check_simd");

    address start = __ pc();

    __ vcnt(Stemp, Stemp);

    __ mov(R0, 1);

    __ ret(LR);

    return start;

  };

};

#undef __

#endif

extern "C" address check_simd_fault_instr;

void VM_Version::initialize() {

  ResourceMark rm;

  // Making this stub must be FIRST use of assembler

  const int stub_size = 128;

  BufferBlob* stub_blob = BufferBlob::create("get_cpu_info", stub_size);

  if (stub_blob == NULL) {

    vm_exit_during_initialization("Unable to allocate get_cpu_info stub");

  }

  if (UseFMA) {

    warning("FMA instructions are not available on this CPU");

    FLAG_SET_DEFAULT(UseFMA, false);

  }

  if (UseSHA) {

    warning("SHA instructions are not available on this CPU");

    FLAG_SET_DEFAULT(UseSHA, false);

  }

  if (UseSHA1Intrinsics) {

    warning("Intrinsics for SHA-1 crypto hash functions not available on this CPU.");

    FLAG_SET_DEFAULT(UseSHA1Intrinsics, false);

  }

  if (UseSHA256Intrinsics) {

    warning("Intrinsics for SHA-224 and SHA-256 crypto hash functions not available on this CPU.");

    FLAG_SET_DEFAULT(UseSHA256Intrinsics, false);

  }

  if (UseSHA512Intrinsics) {

    warning("Intrinsics for SHA-384 and SHA-512 crypto hash functions not available on this CPU.");

    FLAG_SET_DEFAULT(UseSHA512Intrinsics, false);

  }

  if (UseCRC32Intrinsics) {

    if (!FLAG_IS_DEFAULT(UseCRC32Intrinsics))

      warning("CRC32 intrinsics are not available on this CPU");

    FLAG_SET_DEFAULT(UseCRC32Intrinsics, false);

  }

  if (UseCRC32CIntrinsics) {

    if (!FLAG_IS_DEFAULT(UseCRC32CIntrinsics))

      warning("CRC32C intrinsics are not available on this CPU");

    FLAG_SET_DEFAULT(UseCRC32CIntrinsics, false);

  }

  if (UseAdler32Intrinsics) {

    warning("Adler32 intrinsics are not available on this CPU");

    FLAG_SET_DEFAULT(UseAdler32Intrinsics, false);

  }

  if (UseVectorizedMismatchIntrinsic) {

    warning("vectorizedMismatch intrinsic is not available on this CPU.");

    FLAG_SET_DEFAULT(UseVectorizedMismatchIntrinsic, false);

  }

  CodeBuffer c(stub_blob);

#ifdef COMPILER2

  VM_Version_StubGenerator g(&c);

  address check_simd_pc = g.generate_check_simd();

  if (check_simd_pc != NULL) {

    check_simd_t check_simd = CAST_TO_FN_PTR(check_simd_t, check_simd_pc);

    check_simd_fault_instr = (address)check_simd;

    _has_simd = check_simd();

  } else {

    assert(! _has_simd, "default _has_simd value must be 'false'");

  }

#endif

  unsigned long auxv = getauxval(AT_HWCAP);

  char buf[512];

  jio_snprintf(buf, sizeof(buf), "AArch64%s",

               ((auxv & HWCAP_AES) ? ", aes" : ""));

  _features_string = os::strdup(buf);

#ifdef COMPILER2

  if (auxv & HWCAP_AES) {

    if (FLAG_IS_DEFAULT(UseAES)) {

      FLAG_SET_DEFAULT(UseAES, true);

    }

    if (!UseAES) {

      if (UseAESIntrinsics && !FLAG_IS_DEFAULT(UseAESIntrinsics)) {

        warning("AES intrinsics require UseAES flag to be enabled. Intrinsics will be disabled.");

      }

      FLAG_SET_DEFAULT(UseAESIntrinsics, false);

    } else {

      if (FLAG_IS_DEFAULT(UseAESIntrinsics)) {

        FLAG_SET_DEFAULT(UseAESIntrinsics, true);

      }

    }

  } else

#endif

  if (UseAES || UseAESIntrinsics) {

    if (UseAES && !FLAG_IS_DEFAULT(UseAES)) {

      warning("AES instructions are not available on this CPU");

      FLAG_SET_DEFAULT(UseAES, false);

    }

    if (UseAESIntrinsics && !FLAG_IS_DEFAULT(UseAESIntrinsics)) {

      warning("AES intrinsics are not available on this CPU");

      FLAG_SET_DEFAULT(UseAESIntrinsics, false);

    }

  }

  if (UseAESCTRIntrinsics) {

    warning("AES/CTR intrinsics are not available on this CPU");

    FLAG_SET_DEFAULT(UseAESCTRIntrinsics, false);

  }

  _supports_cx8 = true;

  _supports_atomic_getset4 = true;

  _supports_atomic_getadd4 = true;

  _supports_atomic_getset8 = true;

  _supports_atomic_getadd8 = true;

  // TODO-AARCH64 revise C2 flags

  if (has_simd()) {

    if (FLAG_IS_DEFAULT(UsePopCountInstruction)) {

      FLAG_SET_DEFAULT(UsePopCountInstruction, true);

    }

  }

  if (FLAG_IS_DEFAULT(AllocatePrefetchDistance)) {

    FLAG_SET_DEFAULT(AllocatePrefetchDistance, 128);

  }

#ifdef COMPILER2

  FLAG_SET_DEFAULT(UseFPUForSpilling, true);

  if (FLAG_IS_DEFAULT(MaxVectorSize)) {

    // FLAG_SET_DEFAULT(MaxVectorSize, has_simd() ? 16 : 8);

    // SIMD/NEON can use 16, but default is 8 because currently

    // larger than 8 will disable instruction scheduling

    FLAG_SET_DEFAULT(MaxVectorSize, 8);

  }

  if (MaxVectorSize > 16) {

    FLAG_SET_DEFAULT(MaxVectorSize, 8);

  }

#endif

  if (FLAG_IS_DEFAULT(Tier4CompileThreshold)) {

    Tier4CompileThreshold = 10000;

  }

  if (FLAG_IS_DEFAULT(Tier3InvocationThreshold)) {

    Tier3InvocationThreshold = 1000;

  }

  if (FLAG_IS_DEFAULT(Tier3CompileThreshold)) {

    Tier3CompileThreshold = 5000;

  }

  if (FLAG_IS_DEFAULT(Tier3MinInvocationThreshold)) {

    Tier3MinInvocationThreshold = 500;

  }

  FLAG_SET_DEFAULT(TypeProfileLevel, 0); // unsupported

  // This machine does not allow unaligned memory accesses

  if (UseUnalignedAccesses) {

    if (!FLAG_IS_DEFAULT(UseUnalignedAccesses))

      warning("Unaligned memory access is not available on this CPU");

    FLAG_SET_DEFAULT(UseUnalignedAccesses, false);

  }

  _is_initialized = true;

}

bool VM_Version::use_biased_locking() {

  // TODO-AARCH64 measure performance and revise

  // The cost of CAS on uniprocessor ARM v6 and later is low compared to the

  // overhead related to slightly longer Biased Locking execution path.

  // Testing shows no improvement when running with Biased Locking enabled

  // on an ARMv6 and higher uniprocessor systems.  The situation is different on

  // ARMv5 and MP systems.

  //

  // Therefore the Biased Locking is enabled on ARMv5 and ARM MP only.

  //

  return os::is_MP();

}