WriteMask.cc

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/*
 * Copyright (c) 2012-2015 Advanced Micro Devices, Inc.
 * All rights reserved.
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 * neither the name of the copyright holders nor the names of its
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 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#include "mem/ruby/common/WriteMask.hh"
 
#include <string>
 
#include "mem/ruby/system/RubySystem.hh"
 
namespace gem5
{
 
namespace ruby
{
 
WriteMask::WriteMask()
    : mSize(RubySystem::getBlockSizeBytes()), mMask(mSize, false),
      mAtomic(false)
{}
 
void
WriteMask::print(std::ostream& out) const
{
    std::string str(mSize,'0');
    for (int i = 0; i < mSize; i++) {
        str[i] = mMask[i] ? ('1') : ('0');
    }
    out << "dirty mask="
        << str
        << std::flush;
}
 
void
WriteMask::performAtomic(uint8_t * p,
        std::deque<uint8_t*>& log, bool isAtomicNoReturn) const
{
    int offset;
    uint8_t *block_update;
    // Here, operations occur in FIFO order from the mAtomicOp
    // vector. This is done to match the ordering of packets
    // that was seen when the initial coalesced request was created.
    for (int i = 0; i < mAtomicOp.size(); i++) {
        if (!isAtomicNoReturn) {
            // Save the old value of the data block in case a
            // return value is needed
            block_update = new uint8_t[mSize];
            std::memcpy(block_update, p, mSize);
            log.push_back(block_update);
        }
        // Perform the atomic operation
        offset = mAtomicOp[i].first;
        AtomicOpFunctor *fnctr = mAtomicOp[i].second;
        (*fnctr)(&p[offset]);
    }
}
 
} // namespace ruby
} // namespace gem5