store_set.hh

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/*
 * Copyright (c) 2004-2005 The Regents of The University of Michigan
 * 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
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#ifndef __CPU_O3_STORE_SET_HH__
#define __CPU_O3_STORE_SET_HH__
 
#include <list>
#include <map>
#include <string_view>
#include <utility>
#include <vector>
 
#include "base/cache/associative_cache.hh"
#include "base/cache/cache_entry.hh"
#include "base/named.hh"
#include "base/types.hh"
#include "cpu/inst_seq.hh"
 
class BaseIndexingPolicy;
 
namespace replacement_policy {
class Base;
}
 
namespace gem5
{
 
namespace o3
{
 
struct ltseqnum
{
    bool
    operator()(const InstSeqNum &lhs, const InstSeqNum &rhs) const
    {
        return lhs > rhs;
    }
};
 

class StoreSet : public Named
{
  public:
    typedef Addr SSID;
 
    class SSITEntry : public CacheEntry
    {
      private:
        SSID _ssid;
      public:
        using TagExtractor = std::function<Addr(Addr)>;
 
        SSITEntry(TagExtractor ext) : CacheEntry(ext), _ssid(MaxAddr) {}
 
        void setSSID(SSID id) { _ssid = id; }
        SSID getSSID(void) const { return _ssid; }
    };

    StoreSet() : Named("StoreSets"), SSIT("SSIT") {};

    StoreSet(std::string_view name, uint64_t clear_period,
             size_t SSIT_entries, int SSIT_assoc,
             replacement_policy::Base *replPolicy,
             BaseIndexingPolicy *indexingPolicy, int LFST_size);

    ~StoreSet();

    void init(uint64_t clear_period,
              size_t SSIT_entries, int SSIT_assoc,
              replacement_policy::Base *_replPolicy,
              BaseIndexingPolicy *_indexingPolicy, int LFST_size);

    void violation(Addr store_PC, Addr load_PC);

    void checkClear();

    void insertLoad(Addr load_PC, InstSeqNum load_seq_num);

    void insertStore(Addr store_PC, InstSeqNum store_seq_num, ThreadID tid);

    InstSeqNum checkInst(Addr PC);

    void issued(Addr issued_PC, InstSeqNum issued_seq_num, bool is_store);

    void squash(InstSeqNum squashed_num, ThreadID tid);

    void clear();

    void dump();
 
  private:
    inline SSID calcSSID(Addr PC)
    { return ((PC ^ (PC >> 10)) % LFSTSize); }

    AssociativeCache<SSITEntry> SSIT;

    std::vector<InstSeqNum> LFST;

    std::vector<bool> validLFST;

    std::map<InstSeqNum, int, ltseqnum> storeList;
 
    typedef std::map<InstSeqNum, int, ltseqnum>::iterator SeqNumMapIt;

    uint64_t clearPeriod;

    int SSITSize;

    int LFSTSize;

    int memOpsPred;
};
 
} // namespace o3
 
} // namespace gem5
 
#endif // __CPU_O3_STORE_SET_HH__