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/*!  
  AEMB INSTRUCTION SET SIMULATOR 
  Copyright (C) 2009 Shawn Tan <shawn.tan@aeste.net>
 
  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU 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
  General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see
  <http://www.gnu.org/licenses/>.
*/

#ifndef _AEMBREGISTERGP_H_
#define _AEMBREGISTERGP_H_

#include <vector>

using std::vector;

namespace aemb {

/**
 * List of special function registers
 */
typedef enum
{
        SFR_PC = 0,
        SFR_MSR = 1,
        SFR_EAR = 3,
        SFR_ESR = 5,    
} SpecialRegs;

/**
   Behavioral class for the general purpose register file that can
   only be read from and written to. It has internal mechanisms to
   check for data hazards.
*/

class RegisterFile
{
        vector<int> regfile; ///< internal general purpose register file
        int rsfr;       
public:
        
        void reset();

        /**
         * Put a value into a register.
         * @param gpr Register number [0:31].
         * @param data Register data to write
         */  
         
        void setRegister(const int gpr, const int data);
        
        /**
         * Get a value from a register.
         * @param gpr Register number [0:31].
         * @return Value of the register.
         */
         
        int getRegister(const int gpr);
        
        /**
         * Get the value of a special register.
         * @param sfr Special register number
         * @return Special register value
         */
         
        int getSpecial(const int sfr);
        
        /**
         * Set the value of a special register
         * @param sfr Special register number
         * @param imm32 Special register value
         */
         
        void setSpecial(const int sfr, const int imm32);
        
        int clrSpecial(const int imm14);
        int setSpecial(const int imm14);
  
        RegisterFile();
        ~RegisterFile();
};

}
#endif