super_blk.hh

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#ifndef __MEM_CACHE_TAGS_SUPER_BLK_HH__
#define __MEM_CACHE_TAGS_SUPER_BLK_HH__
 
#include "mem/cache/tags/sector_blk.hh"
 
namespace gem5
{
 
class SuperBlk;
 
class CompressionBlk : public SectorSubBlk
{
  private:
    std::size_t _size;
 
    Cycles _decompressionLatency;
 
    bool _compressed;
 
  public:
    enum OverwriteType : int
    {
        DATA_CONTRACTION = -1,
        UNCHANGED = 0,
        DATA_EXPANSION = 1,
    };
 
    CompressionBlk();
    CompressionBlk(const CompressionBlk&) = delete;
    CompressionBlk& operator=(const CompressionBlk&) = delete;
    CompressionBlk(CompressionBlk&&) = delete;
    CompressionBlk& operator=(CompressionBlk&& other);
    CacheBlk& operator=(CacheBlk&& other) override;
    ~CompressionBlk() = default;
 
    bool isCompressed() const;
 
    void setCompressed();
 
    void setUncompressed();
 
    /*
     * Get size, in bits, of this compressed block's data.
     *
     * @return The compressed size.
     */
    std::size_t getSizeBits() const;
 
    void setSizeBits(const std::size_t size);
 
    Cycles getDecompressionLatency() const;
 
    void setDecompressionLatency(const Cycles lat);
 
    void invalidate() override;
 
    OverwriteType checkExpansionContraction(const std::size_t size) const;
 
    std::string print() const override;
};
 
class SuperBlk : public SectorBlk
{
  protected:
    std::size_t blkSize;
 
    uint8_t compressionFactor;
 
  public:
    SuperBlk();
    SuperBlk(const SuperBlk&) = delete;
    SuperBlk& operator=(const SuperBlk&) = delete;
    ~SuperBlk() {};
 
    bool isCompressed(const CompressionBlk* ignored_blk = nullptr) const;
 
    bool canCoAllocate(const std::size_t compressed_size) const;
 
    void setBlkSize(const std::size_t blk_size);
 
    uint8_t calculateCompressionFactor(const std::size_t size) const;
 
    uint8_t getCompressionFactor() const;
 
    void setCompressionFactor(const uint8_t compression_factor);
 
    void invalidate() override;
 
    std::string print() const override;
};
 
} // namespace gem5
 
#endif //__MEM_CACHE_TAGS_SUPER_BLK_HH__