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 /*

  * Copyright (c) 1997, 2014, 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/stubCodeGenerator.hpp"

 #include "vm_version_sparc.hpp"

 #ifdef TARGET_OS_FAMILY_linux

 # include "os_linux.inline.hpp"

 #endif

 #ifdef TARGET_OS_FAMILY_solaris

 # include "os_solaris.inline.hpp"

 #endif

 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 = 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;

 #ifndef PRODUCT

   if (PrintMiscellaneous && Verbose) {

     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;

 }