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

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#ifndef SPR_CACHE__H
#ifndef SPR_CACHE__H
#define SPR_CACHE__H
#define SPR_CACHE__H
 
 
#include <stdint.h>
#include <stdint.h>
 
 
 
 
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
//! Module for cacheing SPR accesses by the debug unit
//! Module for cacheing SPR accesses by the debug unit
 
 
//! SPR reads and writes through the Debug Unit via JTAG are time
//! SPR 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
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//! allowed to be no more than 70% full (however NPC is always
//! allowed to be no more than 70% full (however NPC is always
//! cacheable). The hash function is a simple modulo function, stepping
//! cacheable). The hash function is a simple modulo function, stepping
//! forward to the first free slot. This works because there is no function to
//! forward to the first free slot. This works because there is no function to
//! delete an entry - just to clear the whole table, so holes cannot appear.
//! delete an entry - just to clear the whole table, so holes cannot appear.
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
class SprCache
class SprCache {
{
 
public:
public:
 
 
  // Constructor and destructor
  // Constructor and destructor
  SprCache (int  _tableSize = 257);
  SprCache (int  _tableSize = 257);
  ~SprCache ();
  ~SprCache ();
 
 
  // Functions
  // Functions
  void  clear ();
  void  clear ();
  void  write (uint16_t  sprNum,
        void write(uint16_t sprNum, uint32_t value, bool force);
               uint32_t  value,
        bool read(uint16_t sprNum, uint32_t & value);
               bool      force);
 
  bool  read (uint16_t  sprNum,
 
              uint32_t &value);
 
 
 
private:
private:
 
 
  //! The size of the hash table
  //! The size of the hash table
  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     *sprIsValid;
  bool     *sprIsValid;
  uint16_t *sprKeyNum;
  uint16_t *sprKeyNum;
  uint32_t *sprValue;
  uint32_t *sprValue;
 
 
 
 
};      // SprCache ()
};      // SprCache ()
 
 
#endif  // SPR_CACHE__H
#endif  // SPR_CACHE__H
 
 
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