write_queue_entry.hh

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 * property including but not limited to intellectual property relating
 * to a hardware implementation of the functionality of the software
 * licensed hereunder.  You may use the software subject to the license
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 * modified or unmodified, in source code or in binary form.
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 * Authors: Erik Hallnor
 *          Andreas Hansson
 */

#ifndef __MEM_CACHE_WRITE_QUEUE_ENTRY_HH__
#define __MEM_CACHE_WRITE_QUEUE_ENTRY_HH__

#include <list>

#include "base/printable.hh"
#include "mem/cache/queue_entry.hh"

class Cache;

class WriteQueueEntry : public QueueEntry, public Printable
{

    template<typename Entry>
    friend class Queue;
    friend class WriteQueue;

  public:

    class Target {
      public:

        const Tick recvTime;  
        const Tick readyTime; 
        const Counter order;  
        const PacketPtr pkt;  

        Target(PacketPtr _pkt, Tick _readyTime, Counter _order)
            : recvTime(curTick()), readyTime(_readyTime), order(_order),
              pkt(_pkt)
        {}
    };

    class TargetList : public std::list<Target> {

      public:

        TargetList() {}
        void add(PacketPtr pkt, Tick readyTime, Counter order);
        bool checkFunctional(PacketPtr pkt);
        void print(std::ostream &os, int verbosity,
                   const std::string &prefix) const;
    };

    typedef std::list<WriteQueueEntry *> List;
    typedef List::iterator Iterator;

    bool sendPacket(Cache &cache);

  private:

    Iterator readyIter;

    Iterator allocIter;

    TargetList targets;

  public:

    WriteQueueEntry() {}

    void allocate(Addr blk_addr, unsigned blk_size, PacketPtr pkt,
                  Tick when_ready, Counter _order);


    void deallocate();

    int getNumTargets() const
    { return targets.size(); }

    bool hasTargets() const { return !targets.empty(); }

    Target *getTarget()
    {
        assert(hasTargets());
        return &targets.front();
    }

    void popTarget()
    {
        targets.pop_front();
    }

    bool checkFunctional(PacketPtr pkt);

    void print(std::ostream &os,
               int verbosity = 0,
               const std::string &prefix = "") const;
    std::string print() const;
};

#endif // __MEM_CACHE_WRITE_QUEUE_ENTRY_HH__