/*

 * Copyright (c) 1997, 2015, 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.hpp"

#include "runtime/stubCodeGenerator.hpp"

#include "vm_version_sparc.hpp"

int VM_Version::_features = VM_Version::unknown_m;

const char* VM_Version::_features_str = "";

unsigned int VM_Version::_L2_data_cache_line_size = 0;

void VM_Version::initialize() {

  _features = determine_features();

  PrefetchCopyIntervalInBytes = prefetch_copy_interval_in_bytes();

  PrefetchScanIntervalInBytes = prefetch_scan_interval_in_bytes();

  PrefetchFieldsAhead         = prefetch_fields_ahead();

  assert(0 <= AllocatePrefetchInstr && AllocatePrefetchInstr <= 1, "invalid value");

  if( AllocatePrefetchInstr < 0 ) AllocatePrefetchInstr = 0;

  if( AllocatePrefetchInstr > 1 ) AllocatePrefetchInstr = 0;

  // Allocation prefetch settings

  intx cache_line_size = prefetch_data_size();

  if( cache_line_size > AllocatePrefetchStepSize )

    AllocatePrefetchStepSize = cache_line_size;

  assert(AllocatePrefetchLines > 0, "invalid value");

  if( AllocatePrefetchLines < 1 )     // set valid value in product VM

    AllocatePrefetchLines = 3;

  assert(AllocateInstancePrefetchLines > 0, "invalid value");

  if( AllocateInstancePrefetchLines < 1 ) // set valid value in product VM

    AllocateInstancePrefetchLines = 1;

  AllocatePrefetchDistance = allocate_prefetch_distance();

  AllocatePrefetchStyle    = allocate_prefetch_style();

  assert((AllocatePrefetchDistance % AllocatePrefetchStepSize) == 0 &&

         (AllocatePrefetchDistance > 0), "invalid value");

  if ((AllocatePrefetchDistance % AllocatePrefetchStepSize) != 0 ||

      (AllocatePrefetchDistance <= 0)) {

    AllocatePrefetchDistance = AllocatePrefetchStepSize;

  }

  if (AllocatePrefetchStyle == 3 && !has_blk_init()) {

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

    FLAG_SET_DEFAULT(AllocatePrefetchStyle, 1);

  }

  guarantee(VM_Version::has_v9(), "only SPARC v9 is supported");

  assert(ArraycopySrcPrefetchDistance < 4096, "invalid value");

  if (ArraycopySrcPrefetchDistance >= 4096)

    ArraycopySrcPrefetchDistance = 4064;

  assert(ArraycopyDstPrefetchDistance < 4096, "invalid value");

  if (ArraycopyDstPrefetchDistance >= 4096)

    ArraycopyDstPrefetchDistance = 4064;

  UseSSE = 0; // Only on x86 and x64

  _supports_cx8 = has_v9();

  _supports_atomic_getset4 = true; // swap instruction

  // There are Fujitsu Sparc64 CPUs which support blk_init as well so

  // we have to take this check out of the 'is_niagara()' block below.

  if (has_blk_init()) {

    // When using CMS or G1, we cannot use memset() in BOT updates

    // because the sun4v/CMT version in libc_psr uses BIS which

    // exposes "phantom zeros" to concurrent readers. See 6948537.

    if (FLAG_IS_DEFAULT(UseMemSetInBOT) && (UseConcMarkSweepGC || UseG1GC)) {

      FLAG_SET_DEFAULT(UseMemSetInBOT, false);

    }

    // Issue a stern warning if the user has explicitly set

    // UseMemSetInBOT (it is known to cause issues), but allow

    // use for experimentation and debugging.

    if (UseConcMarkSweepGC || UseG1GC) {

      if (UseMemSetInBOT) {

        assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error");

        warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability"

                " on sun4v; please understand that you are using at your own risk!");

      }

    }

  }

  if (is_niagara()) {

    // Indirect branch is the same cost as direct

    if (FLAG_IS_DEFAULT(UseInlineCaches)) {

      FLAG_SET_DEFAULT(UseInlineCaches, false);

    }

    // Align loops on a single instruction boundary.

    if (FLAG_IS_DEFAULT(OptoLoopAlignment)) {

      FLAG_SET_DEFAULT(OptoLoopAlignment, 4);

    }

#ifdef _LP64

    // 32-bit oops don't make sense for the 64-bit VM on sparc

    // since the 32-bit VM has the same registers and smaller objects.

    Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);

    Universe::set_narrow_klass_shift(LogKlassAlignmentInBytes);

#endif // _LP64

#ifdef COMPILER2

    // Indirect branch is the same cost as direct

    if (FLAG_IS_DEFAULT(UseJumpTables)) {

      FLAG_SET_DEFAULT(UseJumpTables, true);

    }

    // Single-issue, so entry and loop tops are

    // aligned on a single instruction boundary

    if (FLAG_IS_DEFAULT(InteriorEntryAlignment)) {

      FLAG_SET_DEFAULT(InteriorEntryAlignment, 4);

    }

    if (is_niagara_plus()) {

      if (has_blk_init() && UseTLAB &&

          FLAG_IS_DEFAULT(AllocatePrefetchInstr)) {

        // Use BIS instruction for TLAB allocation prefetch.

        FLAG_SET_ERGO(intx, AllocatePrefetchInstr, 1);

        if (FLAG_IS_DEFAULT(AllocatePrefetchStyle)) {

          FLAG_SET_ERGO(intx, AllocatePrefetchStyle, 3);

        }

        if (FLAG_IS_DEFAULT(AllocatePrefetchDistance)) {

          // Use smaller prefetch distance with BIS

          FLAG_SET_DEFAULT(AllocatePrefetchDistance, 64);

        }

      }

      if (is_T4()) {

        // Double number of prefetched cache lines on T4

        // since L2 cache line size is smaller (32 bytes).

        if (FLAG_IS_DEFAULT(AllocatePrefetchLines)) {

          FLAG_SET_ERGO(intx, AllocatePrefetchLines, AllocatePrefetchLines*2);

        }

        if (FLAG_IS_DEFAULT(AllocateInstancePrefetchLines)) {

          FLAG_SET_ERGO(intx, AllocateInstancePrefetchLines, AllocateInstancePrefetchLines*2);

        }

      }

      if (AllocatePrefetchStyle != 3 && FLAG_IS_DEFAULT(AllocatePrefetchDistance)) {

        // Use different prefetch distance without BIS

        FLAG_SET_DEFAULT(AllocatePrefetchDistance, 256);

      }

      if (AllocatePrefetchInstr == 1) {

        // Need a space at the end of TLAB for BIS since it

        // will fault when accessing memory outside of heap.

        // +1 for rounding up to next cache line, +1 to be safe

        int lines = AllocatePrefetchLines + 2;

        int step_size = AllocatePrefetchStepSize;

        int distance = AllocatePrefetchDistance;

        _reserve_for_allocation_prefetch = (distance + step_size*lines)/(int)HeapWordSize;

      }

    }

#endif

  }

  // Use hardware population count instruction if available.

  if (has_hardware_popc()) {

    if (FLAG_IS_DEFAULT(UsePopCountInstruction)) {

      FLAG_SET_DEFAULT(UsePopCountInstruction, true);

    }

  } else if (UsePopCountInstruction) {

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

    FLAG_SET_DEFAULT(UsePopCountInstruction, false);

  }

  // T4 and newer Sparc cpus have new compare and branch instruction.

  if (has_cbcond()) {

    if (FLAG_IS_DEFAULT(UseCBCond)) {

      FLAG_SET_DEFAULT(UseCBCond, true);

    }

  } else if (UseCBCond) {

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

    FLAG_SET_DEFAULT(UseCBCond, false);

  }

  assert(BlockZeroingLowLimit > 0, "invalid value");

  if (has_block_zeroing() && cache_line_size > 0) {

    if (FLAG_IS_DEFAULT(UseBlockZeroing)) {

      FLAG_SET_DEFAULT(UseBlockZeroing, true);

    }

  } else if (UseBlockZeroing) {

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

    FLAG_SET_DEFAULT(UseBlockZeroing, false);

  }

  assert(BlockCopyLowLimit > 0, "invalid value");

  if (has_block_zeroing() && cache_line_size > 0) { // has_blk_init() && is_T4(): core's local L2 cache

    if (FLAG_IS_DEFAULT(UseBlockCopy)) {

      FLAG_SET_DEFAULT(UseBlockCopy, true);

    }

  } else if (UseBlockCopy) {

    warning("BIS instructions are not available or expensive on this CPU");

    FLAG_SET_DEFAULT(UseBlockCopy, false);

  }

#ifdef COMPILER2

  // T4 and newer Sparc cpus have fast RDPC.

  if (has_fast_rdpc() && FLAG_IS_DEFAULT(UseRDPCForConstantTableBase)) {

    FLAG_SET_DEFAULT(UseRDPCForConstantTableBase, true);

  }

  // Currently not supported anywhere.

  FLAG_SET_DEFAULT(UseFPUForSpilling, false);

  MaxVectorSize = 8;

  assert((InteriorEntryAlignment % relocInfo::addr_unit()) == 0, "alignment is not a multiple of NOP size");

#endif

  assert((CodeEntryAlignment % relocInfo::addr_unit()) == 0, "alignment is not a multiple of NOP size");

  assert((OptoLoopAlignment % relocInfo::addr_unit()) == 0, "alignment is not a multiple of NOP size");

  char buf[512];

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

               (has_v9() ? ", v9" : (has_v8() ? ", v8" : "")),

               (has_hardware_popc() ? ", popc" : ""),

               (has_vis1() ? ", vis1" : ""),

               (has_vis2() ? ", vis2" : ""),

               (has_vis3() ? ", vis3" : ""),

               (has_blk_init() ? ", blk_init" : ""),

               (has_cbcond() ? ", cbcond" : ""),

               (has_aes() ? ", aes" : ""),

               (has_sha1() ? ", sha1" : ""),

               (has_sha256() ? ", sha256" : ""),

               (has_sha512() ? ", sha512" : ""),

               (is_ultra3() ? ", ultra3" : ""),

               (is_sun4v() ? ", sun4v" : ""),

               (is_niagara_plus() ? ", niagara_plus" : (is_niagara() ? ", niagara" : "")),

               (is_sparc64() ? ", sparc64" : ""),

               (!has_hardware_mul32() ? ", no-mul32" : ""),

               (!has_hardware_div32() ? ", no-div32" : ""),

               (!has_hardware_fsmuld() ? ", no-fsmuld" : ""));

  // buf is started with ", " or is empty

  _features_str = os::strdup(strlen(buf) > 2 ? buf + 2 : buf);

  // UseVIS is set to the smallest of what hardware supports and what

  // the command line requires.  I.e., you cannot set UseVIS to 3 on

  // older UltraSparc which do not support it.

  if (UseVIS > 3) UseVIS=3;

  if (UseVIS < 0) UseVIS=0;

  if (!has_vis3()) // Drop to 2 if no VIS3 support

    UseVIS = MIN2((intx)2,UseVIS);

  if (!has_vis2()) // Drop to 1 if no VIS2 support

    UseVIS = MIN2((intx)1,UseVIS);

  if (!has_vis1()) // Drop to 0 if no VIS1 support

    UseVIS = 0;

  // SPARC T4 and above should have support for AES instructions

  if (has_aes()) {

    if (UseVIS > 2) { // AES intrinsics use MOVxTOd/MOVdTOx which are VIS3

      if (FLAG_IS_DEFAULT(UseAES)) {

        FLAG_SET_DEFAULT(UseAES, true);

      }

      if (FLAG_IS_DEFAULT(UseAESIntrinsics)) {

        FLAG_SET_DEFAULT(UseAESIntrinsics, true);

      }

      // we disable both the AES flags if either of them is disabled on the command line

      if (!UseAES || !UseAESIntrinsics) {

        FLAG_SET_DEFAULT(UseAES, false);

        FLAG_SET_DEFAULT(UseAESIntrinsics, false);

      }

    } else {

        if (UseAES || UseAESIntrinsics) {

          warning("SPARC AES intrinsics require VIS3 instruction support. Intrinsics will be disabled.");

          if (UseAES) {

            FLAG_SET_DEFAULT(UseAES, false);

          }

          if (UseAESIntrinsics) {

            FLAG_SET_DEFAULT(UseAESIntrinsics, false);

          }

        }

    }

  } else if (UseAES || UseAESIntrinsics) {

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

    if (UseAES) {

      FLAG_SET_DEFAULT(UseAES, false);

    }

    if (UseAESIntrinsics) {

      FLAG_SET_DEFAULT(UseAESIntrinsics, false);

    }

  }

  // SHA1, SHA256, and SHA512 instructions were added to SPARC T-series at different times

  if (has_sha1() || has_sha256() || has_sha512()) {

    if (UseVIS > 0) { // SHA intrinsics use VIS1 instructions

      if (FLAG_IS_DEFAULT(UseSHA)) {

        FLAG_SET_DEFAULT(UseSHA, true);

      }

    } else {

      if (UseSHA) {

        warning("SPARC SHA intrinsics require VIS1 instruction support. Intrinsics will be disabled.");

        FLAG_SET_DEFAULT(UseSHA, false);

      }

    }

  } 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 (has_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 (has_sha256()) {

      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 (has_sha512()) {

      if (FLAG_IS_DEFAULT(UseSHA512Intrinsics)) {

        FLAG_SET_DEFAULT(UseSHA512Intrinsics, true);

      }

    } else if (UseSHA512Intrinsics) {

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

      FLAG_SET_DEFAULT(UseSHA512Intrinsics, false);

    }

    if (!(UseSHA1Intrinsics || UseSHA256Intrinsics || UseSHA512Intrinsics)) {

      FLAG_SET_DEFAULT(UseSHA, false);

    }

  }

  if (FLAG_IS_DEFAULT(ContendedPaddingWidth) &&

    (cache_line_size > ContendedPaddingWidth))

    ContendedPaddingWidth = cache_line_size;

  // 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);

  }

#ifndef PRODUCT

  if (PrintMiscellaneous && Verbose) {

    tty->print_cr("L1 data cache line size: %u", L1_data_cache_line_size());

    tty->print_cr("L2 data cache line size: %u", L2_data_cache_line_size());

    tty->print("Allocation");

    if (AllocatePrefetchStyle <= 0) {

      tty->print_cr(": no prefetching");

    } else {

      tty->print(" prefetching: ");

      if (AllocatePrefetchInstr == 0) {

          tty->print("PREFETCH");

      } else if (AllocatePrefetchInstr == 1) {

          tty->print("BIS");

      }

      if (AllocatePrefetchLines > 1) {

        tty->print_cr(" at distance %d, %d lines of %d bytes", (int) AllocatePrefetchDistance, (int) AllocatePrefetchLines, (int) AllocatePrefetchStepSize);

      } else {

        tty->print_cr(" at distance %d, one line of %d bytes", (int) AllocatePrefetchDistance, (int) AllocatePrefetchStepSize);

      }

    }

    if (PrefetchCopyIntervalInBytes > 0) {

      tty->print_cr("PrefetchCopyIntervalInBytes %d", (int) PrefetchCopyIntervalInBytes);

    }

    if (PrefetchScanIntervalInBytes > 0) {

      tty->print_cr("PrefetchScanIntervalInBytes %d", (int) PrefetchScanIntervalInBytes);

    }

    if (PrefetchFieldsAhead > 0) {

      tty->print_cr("PrefetchFieldsAhead %d", (int) PrefetchFieldsAhead);

    }

    if (ContendedPaddingWidth > 0) {

      tty->print_cr("ContendedPaddingWidth %d", (int) ContendedPaddingWidth);

    }

  }

#endif // PRODUCT

}

void VM_Version::print_features() {

  tty->print_cr("Version:%s", cpu_features());

}

int VM_Version::determine_features() {

  if (UseV8InstrsOnly) {

    NOT_PRODUCT(if (PrintMiscellaneous && Verbose) tty->print_cr("Version is Forced-V8");)

    return generic_v8_m;

  }

  int features = platform_features(unknown_m); // platform_features() is os_arch specific

  if (features == unknown_m) {

    features = generic_v9_m;

    warning("Cannot recognize SPARC version. Default to V9");

  }

  assert(is_T_family(features) == is_niagara(features), "Niagara should be T series");

  if (UseNiagaraInstrs) { // Force code generation for Niagara

    if (is_T_family(features)) {

      // Happy to accomodate...

    } else {

      NOT_PRODUCT(if (PrintMiscellaneous && Verbose) tty->print_cr("Version is Forced-Niagara");)

      features |= T_family_m;

    }

  } else {

    if (is_T_family(features) && !FLAG_IS_DEFAULT(UseNiagaraInstrs)) {

      NOT_PRODUCT(if (PrintMiscellaneous && Verbose) tty->print_cr("Version is Forced-Not-Niagara");)

      features &= ~(T_family_m | T1_model_m);

    } else {

      // Happy to accomodate...

    }

  }

  return features;

}

static int saved_features = 0;

void VM_Version::allow_all() {

  saved_features = _features;

  _features      = all_features_m;

}

void VM_Version::revert() {

  _features = saved_features;

}

unsigned int VM_Version::calc_parallel_worker_threads() {

  unsigned int result;

  if (is_M_series()) {

    // for now, use same gc thread calculation for M-series as for niagara-plus

    // in future, we may want to tweak parameters for nof_parallel_worker_thread

    result = nof_parallel_worker_threads(5, 16, 8);

  } else if (is_niagara_plus()) {

    result = nof_parallel_worker_threads(5, 16, 8);

  } else {

    result = nof_parallel_worker_threads(5, 8, 8);

  }

  return result;

}