| /* |
| * 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. |
| */ |
| |
| #include "mem/ruby/filters/MultiGrainBloomFilter.hh" |
| |
| #include "base/intmath.hh" |
| #include "mem/ruby/system/RubySystem.hh" |
| |
| MultiGrainBloomFilter::MultiGrainBloomFilter(int head, int tail) |
| { |
| // head contains size of 1st bloom filter, tail contains size of |
| // 2nd bloom filter |
| m_filter_size = head; |
| m_filter_size_bits = floorLog2(m_filter_size); |
| |
| m_page_filter_size = tail; |
| m_page_filter_size_bits = floorLog2(m_page_filter_size); |
| |
| m_filter.resize(m_filter_size); |
| m_page_filter.resize(m_page_filter_size); |
| clear(); |
| } |
| |
| MultiGrainBloomFilter::~MultiGrainBloomFilter() |
| { |
| } |
| |
| void |
| MultiGrainBloomFilter::clear() |
| { |
| for (int i = 0; i < m_filter_size; i++) { |
| m_filter[i] = 0; |
| } |
| for (int i=0; i < m_page_filter_size; ++i){ |
| m_page_filter[i] = 0; |
| } |
| } |
| |
| void |
| MultiGrainBloomFilter::merge(AbstractBloomFilter *other_filter) |
| { |
| // TODO |
| } |
| |
| void |
| MultiGrainBloomFilter::set(Addr addr) |
| { |
| int i = get_block_index(addr); |
| assert(i < m_filter_size); |
| assert(get_page_index(addr) < m_page_filter_size); |
| m_filter[i] = 1; |
| m_page_filter[i] = 1; |
| |
| } |
| |
| bool |
| MultiGrainBloomFilter::isSet(Addr addr) |
| { |
| int i = get_block_index(addr); |
| assert(i < m_filter_size); |
| assert(get_page_index(addr) < m_page_filter_size); |
| // we have to have both indices set |
| return (m_filter[i] && m_page_filter[i]); |
| } |
| |
| int |
| MultiGrainBloomFilter::getCount(Addr addr) |
| { |
| // not used |
| return 0; |
| } |
| |
| int |
| MultiGrainBloomFilter::getTotalCount() |
| { |
| int count = 0; |
| |
| for (int i = 0; i < m_filter_size; i++) { |
| count += m_filter[i]; |
| } |
| |
| for (int i=0; i < m_page_filter_size; ++i) { |
| count += m_page_filter[i] = 0; |
| } |
| |
| return count; |
| } |
| |
| int |
| MultiGrainBloomFilter::getIndex(Addr addr) |
| { |
| return 0; |
| // TODO |
| } |
| |
| int |
| MultiGrainBloomFilter::readBit(const int index) |
| { |
| return 0; |
| // TODO |
| } |
| |
| void |
| MultiGrainBloomFilter::writeBit(const int index, const int value) |
| { |
| // TODO |
| } |
| |
| int |
| MultiGrainBloomFilter::get_block_index(Addr addr) |
| { |
| // grap a chunk of bits after byte offset |
| return bitSelect(addr, RubySystem::getBlockSizeBits(), |
| RubySystem::getBlockSizeBits() + |
| m_filter_size_bits - 1); |
| } |
| |
| int |
| MultiGrainBloomFilter::get_page_index(Addr addr) |
| { |
| int bits = RubySystem::getBlockSizeBits() + m_filter_size_bits - 1; |
| |
| // grap a chunk of bits after first chunk |
| return bitSelect(addr, bits, bits + m_page_filter_size_bits - 1); |
| } |
| |
| |
| |
| |