J9CPU.cpp

/*******************************************************************************
 * Copyright IBM Corp. and others 2000
 *
 * This program and the accompanying materials are made available under
 * the terms of the Eclipse Public License 2.0 which accompanies this
 * distribution and is available at https://www.eclipse.org/legal/epl-2.0/
 * or the Apache License, Version 2.0 which accompanies this distribution and
 * is available at https://www.apache.org/licenses/LICENSE-2.0.
 *
 * This Source Code may also be made available under the following
 * Secondary Licenses when the conditions for such availability set
 * forth in the Eclipse Public License, v. 2.0 are satisfied: GNU
 * General Public License, version 2 with the GNU Classpath
 * Exception [1] and GNU General Public License, version 2 with the
 * OpenJDK Assembly Exception [2].
 *
 * [1] https://www.gnu.org/software/classpath/license.html
 * [2] https://openjdk.org/legal/assembly-exception.html
 *
 * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0-only WITH Classpath-exception-2.0 OR GPL-2.0-only WITH OpenJDK-assembly-exception-1.0
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#if defined(J9ZOS390)
#pragma csect(CODE,"J9J9CPU#C")
#pragma csect(STATIC,"J9J9CPU#S")
#pragma csect(TEST,"J9J9CPU#T")
#endif

#include "env/CPU.hpp"
#include "env/VMJ9.h"
#include "infra/Assert.hpp"                         // for TR_ASSERT

OMRProcessorDesc J9::CPU::_supportedFeatureMasks = {OMR_PROCESSOR_UNDEFINED, OMR_PROCESSOR_UNDEFINED, {}};
bool J9::CPU::_isSupportedFeatureMasksEnabled = false;

const char *
J9::CPU::getProcessorVendorId() 
   {
   TR_ASSERT_FATAL(false, "Vendor ID not defined for this platform!");
   return NULL;
   }

uint32_t 
J9::CPU::getProcessorSignature()
   {
   TR_ASSERT_FATAL(false, "Processor Signature not defined for this platform!"); 
   return 0;
   }

void
J9::CPU::enableFeatureMasks()
   {
   // Assume all features will be utilized by default
   memset(_supportedFeatureMasks.features, ~0, OMRPORT_SYSINFO_FEATURES_SIZE*sizeof(uint32_t));
   _isSupportedFeatureMasksEnabled = true;
   }

TR::CPU
J9::CPU::customize(OMRProcessorDesc processorDescription)
   {
   if (_isSupportedFeatureMasksEnabled)
      {
      // mask out any cpu features that the compiler doesn't care about
      for (size_t i = 0; i < OMRPORT_SYSINFO_FEATURES_SIZE; i++)
         {
         processorDescription.features[i] &= _supportedFeatureMasks.features[i];
         }
      }
   return TR::CPU(processorDescription);
   }

TR::CPU
J9::CPU::detect(OMRPortLibrary * const omrPortLib)
   {   
   if (omrPortLib == NULL)
      return TR::CPU();

   OMRPORT_ACCESS_FROM_OMRPORT(omrPortLib);
   OMRProcessorDesc processorDescription;
   omrsysinfo_get_processor_description(&processorDescription);

   TR::CPU::enableFeatureMasks();
   return TR::CPU::customize(processorDescription);
   }

bool
J9::CPU::supportsFeature(uint32_t feature)
   {
   OMRPORT_ACCESS_FROM_OMRPORT(TR::Compiler->omrPortLib);

   static bool disableCPUDetectionTest = feGetEnv("TR_DisableCPUDetectionTest");
   if (!disableCPUDetectionTest && _isSupportedFeatureMasksEnabled)
      {
      TR_ASSERT_FATAL(TRUE == omrsysinfo_processor_has_feature(&_supportedFeatureMasks, feature), "New processor feature usage detected, please add feature %d to _supportedFeatureMasks via TR::CPU::enableFeatureMasks()\n", feature);
      }

   return TRUE == omrsysinfo_processor_has_feature(&_processorDescription, feature);
   }