/*

 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.

 * Copyright (c) 2014, Red Hat 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 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.hpp"

#include "asm/macroAssembler.inline.hpp"

#include "memory/resourceArea.hpp"

#include "runtime/java.hpp"

#include "runtime/stubCodeGenerator.hpp"

#include "vm_version_aarch64.hpp"

#ifdef TARGET_OS_FAMILY_linux

# include "os_linux.inline.hpp"

#endif

#ifndef BUILTIN_SIM

#include <sys/auxv.h>

#include <asm/hwcap.h>

#else

#define getauxval(hwcap) 0

#endif

#ifndef HWCAP_AES

#define HWCAP_AES   (1<<3)

#endif

#ifndef HWCAP_SHA1

#define HWCAP_SHA1  (1<<5)

#endif

#ifndef HWCAP_SHA2

#define HWCAP_SHA2  (1<<6)

#endif

#ifndef HWCAP_CRC32

#define HWCAP_CRC32 (1<<7)

#endif

int VM_Version::_cpu;

int VM_Version::_model;

int VM_Version::_stepping;

int VM_Version::_cpuFeatures;

const char*           VM_Version::_features_str = "";

static BufferBlob* stub_blob;

static const int stub_size = 550;

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() {

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

#   define __ _masm->

    address start = __ pc();

#ifdef BUILTIN_SIM

    __ c_stub_prolog(1, 0, MacroAssembler::ret_type_void);

#endif

    // void getPsrInfo(VM_Version::CpuidInfo* cpuid_info);

    address entry = __ pc();

    // TODO : redefine fields in CpuidInfo and generate

    // code to fill them in

    __ ret(lr);

#   undef __

    return start;

  }

};

void VM_Version::get_processor_features() {

  _supports_cx8 = true;

  _supports_atomic_getset4 = true;

  _supports_atomic_getadd4 = true;

  _supports_atomic_getset8 = true;

  _supports_atomic_getadd8 = true;

  if (FLAG_IS_DEFAULT(AllocatePrefetchDistance))

    FLAG_SET_DEFAULT(AllocatePrefetchDistance, 256);

  if (FLAG_IS_DEFAULT(AllocatePrefetchStepSize))

    FLAG_SET_DEFAULT(AllocatePrefetchStepSize, 64);

  FLAG_SET_DEFAULT(PrefetchScanIntervalInBytes, 256);

  FLAG_SET_DEFAULT(PrefetchFieldsAhead, 256);

  FLAG_SET_DEFAULT(PrefetchCopyIntervalInBytes, 256);

  FLAG_SET_DEFAULT(UseSSE42Intrinsics, true);

  unsigned long auxv = getauxval(AT_HWCAP);

  char buf[512];

  strcpy(buf, "simd");

  if (auxv & HWCAP_CRC32) strcat(buf, ", crc");

  if (auxv & HWCAP_AES)   strcat(buf, ", aes");

  if (auxv & HWCAP_SHA1)  strcat(buf, ", sha1");

  if (auxv & HWCAP_SHA2)  strcat(buf, ", sha256");

  _features_str = strdup(buf);

  if (FLAG_IS_DEFAULT(UseCRC32)) {

    UseCRC32 = (auxv & HWCAP_CRC32) != 0;

  }

  if (UseCRC32 && (auxv & HWCAP_CRC32) == 0) {

    warning("UseCRC32 specified, but not supported on this CPU");

  }

  if (auxv & HWCAP_AES) {

    UseAES = UseAES || FLAG_IS_DEFAULT(UseAES);

    UseAESIntrinsics =

        UseAESIntrinsics || (UseAES && FLAG_IS_DEFAULT(UseAESIntrinsics));

    if (UseAESIntrinsics && !UseAES) {

      warning("UseAESIntrinsics enabled, but UseAES not, enabling");

      UseAES = true;

    }

  } else {

    if (UseAES) {

      warning("UseAES specified, but not supported on this CPU");

    }

    if (UseAESIntrinsics) {

      warning("UseAESIntrinsics specified, but not supported on this CPU");

    }

  }

  if (FLAG_IS_DEFAULT(UseCRC32Intrinsics)) {

    UseCRC32Intrinsics = true;

  }

  if (auxv & (HWCAP_SHA1 | HWCAP_SHA2)) {

    if (FLAG_IS_DEFAULT(UseSHA)) {

      FLAG_SET_DEFAULT(UseSHA, true);

    }

  } else if (UseSHA) {

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

    FLAG_SET_DEFAULT(UseSHA, false);

  }

  if (!UseSHA) {

    FLAG_SET_DEFAULT(UseSHA1Intrinsics, false);

    FLAG_SET_DEFAULT(UseSHA256Intrinsics, false);

    FLAG_SET_DEFAULT(UseSHA512Intrinsics, false);

  } else {

    if (auxv & HWCAP_SHA1) {

      if (FLAG_IS_DEFAULT(UseSHA1Intrinsics)) {

        FLAG_SET_DEFAULT(UseSHA1Intrinsics, true);

      }

    } else if (UseSHA1Intrinsics) {

      warning("SHA1 instruction is not available on this CPU.");

      FLAG_SET_DEFAULT(UseSHA1Intrinsics, false);

    }

    if (auxv & HWCAP_SHA2) {

      if (FLAG_IS_DEFAULT(UseSHA256Intrinsics)) {

        FLAG_SET_DEFAULT(UseSHA256Intrinsics, true);

      }

    } else if (UseSHA256Intrinsics) {

      warning("SHA256 instruction (for SHA-224 and SHA-256) is not available on this CPU.");

      FLAG_SET_DEFAULT(UseSHA256Intrinsics, false);

    }

    if (UseSHA512Intrinsics) {

      warning("SHA512 instruction (for SHA-384 and SHA-512) is not available on this CPU.");

      FLAG_SET_DEFAULT(UseSHA512Intrinsics, false);

    }

  }

#ifdef COMPILER2

  if (FLAG_IS_DEFAULT(OptoScheduling)) {

    OptoScheduling = true;

  }

#endif

}

void VM_Version::initialize() {

  ResourceMark rm;

  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);

  VM_Version_StubGenerator g(&c);

  getPsrInfo_stub = CAST_TO_FN_PTR(getPsrInfo_stub_t,

                                   g.generate_getPsrInfo());

  get_processor_features();

}