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Subversion Repositories openrisc_2011-10-31

[/] [openrisc/] [trunk/] [orpsocv2/] [bench/] [sysc/] [include/] [MemCache.h] - Diff between revs 63 and 462

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Rev 63 Rev 462
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#ifndef MEM_CACHE__H
#ifndef MEM_CACHE__H
#define MEM_CACHE__H
#define MEM_CACHE__H
 
 
#include <stdint.h>
#include <stdint.h>
 
 
 
 
//! Module for cacheing memory accesses by the debug unit
//! Module for cacheing memory accesses by the debug unit
 
 
//! Memory reads and writes through the Debug Unit via JTAG are time
//! Memory reads and writes through the Debug Unit via JTAG are time
//! consuming - of the order of 1000 CPU clock cycles. However when the
//! consuming - of the order of 1000 CPU clock cycles. However when the
//! processor is stalled the values cannot change, other than through the
//! processor is stalled the values cannot change, other than through the
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//! a closed hash table.
//! a closed hash table.
 
 
//! In the event of a clash on write, the old value is replaced by the new
//! In the event of a clash on write, the old value is replaced by the new
//! value.
//! value.
 
 
class MemCache
class MemCache {
{
 
public:
public:
 
 
  // Constructor and destructor
  // Constructor and destructor
  MemCache (int  _tableSize = 1009);
  MemCache (int  _tableSize = 1009);
  ~MemCache ();
  ~MemCache ();
 
 
  // Functions
  // Functions
  void  clear ();
  void  clear ();
  void  write (uint32_t  addr,
        void write(uint32_t addr, uint32_t value);
               uint32_t  value);
        bool read(uint32_t addr, uint32_t & value);
  bool  read (uint32_t  addr,
 
              uint32_t &value);
 
 
 
private:
private:
 
 
  //! The size of the hash table. A prime number is a good choice.
  //! The size of the hash table. A prime number is a good choice.
  int  tableSize;
  int  tableSize;
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  // allowing unambiguous clearing by use of memset for efficiency.
  // allowing unambiguous clearing by use of memset for efficiency.
  bool     *tabIsValid;
  bool     *tabIsValid;
  uint32_t *tabKeyAddr;
  uint32_t *tabKeyAddr;
  uint32_t *tabValue;
  uint32_t *tabValue;
 
 
 
 
};      // MemCache ()
};      // MemCache ()
 
 
#endif  // MEM_CACHE__H
#endif  // MEM_CACHE__H
 
 
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