gem5/src/mem/ruby/tester/CheckTable.cc

/*
 * Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * $Id$
 *
 */

#include "CheckTable.hh"
#include "Check.hh"
#include "Map.hh"

CheckTable::CheckTable()
{
  m_lookup_map_ptr = new Map<Address, Check*>;
  physical_address_t physical = 0;
  Address address;

  const int size1 = 32;
  const int size2 = 100;

  // The first set is to get some false sharing
  physical = 1000;
  for (int i=0; i<size1; i++) {
    // Setup linear addresses
    address.setAddress(physical);
    addCheck(address);
    physical += CHECK_SIZE;
  }

  // The next two sets are to get some limited false sharing and cache conflicts
  physical = 1000;
  for (int i=0; i<size2; i++) {
    // Setup linear addresses
    address.setAddress(physical);
    addCheck(address);
    physical += 256;
  }

  physical = 1000 + CHECK_SIZE;
  for (int i=0; i<size2; i++) {
    // Setup linear addresses
    address.setAddress(physical);
    addCheck(address);
    physical += 256;
  }
}

CheckTable::~CheckTable()
{
  int size = m_check_vector.size();
  for (int i=0; i<size; i++) {
    delete m_check_vector[i];
  }
  delete m_lookup_map_ptr;
}

void CheckTable::addCheck(const Address& address)
{
  if (log_int(CHECK_SIZE) != 0) {
    if (address.bitSelect(0,CHECK_SIZE_BITS-1) != 0) {
      ERROR_MSG("Check not aligned");
    }
  }

  for (int i=0; i<CHECK_SIZE; i++) {
    if (m_lookup_map_ptr->exist(Address(address.getAddress()+i))) {
      // A mapping for this byte already existed, discard the entire check
      return;
    }
  }

  Check* check_ptr = new Check(address, Address(100+m_check_vector.size()));
  for (int i=0; i<CHECK_SIZE; i++) {
    // Insert it once per byte
    m_lookup_map_ptr->add(Address(address.getAddress()+i), check_ptr);
  }
  m_check_vector.insertAtBottom(check_ptr);
}

Check* CheckTable::getRandomCheck()
{
  return m_check_vector[random() % m_check_vector.size()];
}

Check* CheckTable::getCheck(const Address& address)
{
  DEBUG_MSG(TESTER_COMP, MedPrio, "Looking for check by address");
  DEBUG_EXPR(TESTER_COMP, MedPrio, address);

  if (m_lookup_map_ptr->exist(address)) {
    Check* check = m_lookup_map_ptr->lookup(address);
    assert(check != NULL);
    return check;
  } else {
    return NULL;
  }
}

void CheckTable::print(ostream& out) const
{
}