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// ----------------------------------------------------------------------------
 
// Matchpoint hash table: definition
 
// Copyright (C) 2008  Embecosm Limited <info@embecosm.com>
 
// Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>
 
// This file is part of the cycle accurate model of the OpenRISC 1000 based
// system-on-chip, ORPSoC, built using Verilator.
 
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or (at your
// option) any later version.
 
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
// License for more details.
 
// You should have received a copy of the GNU Lesser General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
// ----------------------------------------------------------------------------
 
// $Id: MpHash.h 317 2009-02-22 19:52:12Z jeremy $
 
#ifndef MP_HASH__H
#define MP_HASH__H
 
#include <stdint.h>
 
 
//! Default size of the matchpoint hash table. Largest prime < 2^10
#define DEFAULT_MP_HASH_SIZE  1021
 
 
//! Enumeration of different types of matchpoint.
 
//! These have explicit values matching the second digit of 'z' and 'Z'
//! packets.
enum MpType {
  BP_MEMORY   = 0,
  BP_HARDWARE = 1,
  WP_WRITE    = 2,
  WP_READ     = 3,
  WP_ACCESS   = 4
};
 
 
class MpHash;
 
//! A structure for a matchpoint hash table entry
struct MpEntry
{
public:
 
  friend class MpHash;		// The only one which can get at next
 
  MpType    type;		//!< Type of matchpoint
  uint32_t  addr;		//!< Address with the matchpoint
  uint32_t  instr;		//!< Substituted instruction
 
 
private:
 
  MpEntry *next;		//!< Next in this slot
};
 
 
//! A hash table for matchpoints
 
//! We do this as our own open hash table. Our keys are a pair of entities
//! (address and type), so STL map is not trivial to use.
 
class MpHash
{
public:
 
  // Constructor and destructor
  MpHash (int  _size = DEFAULT_MP_HASH_SIZE);
  ~MpHash ();
 
  // Accessor methods
  void  add (MpType    type,
	     uint32_t  addr,
	     uint32_t  instr);
  MpEntry *lookup (MpType    type,
		   uint32_t  addr);
  bool  remove (MpType    type,
		uint32_t  addr,
		uint32_t *instr = NULL);
 
private:
 
  //! The hash table
  MpEntry **hashTab;
 
  //! Size of the hash table
  int  size;
 
};
 
#endif	// MP_HASH__H