source: trunk/IPs/systemC/processor/Morpheo/Behavioural/Core/Multi_Front_end/Front_end/Decod_unit/Decod/src/Decod_genMealy.cpp @ 78

#ifdef SYSTEMC
/*
 * $Id$
 *
 * [ Description ]
 * 
 */

#include "Behavioural/Core/Multi_Front_end/Front_end/Decod_unit/Decod/include/Decod.h"

namespace morpheo                    {
namespace behavioural {
namespace core {
namespace multi_front_end {
namespace front_end {
namespace decod_unit {
namespace decod {


#undef  FUNCTION
#define FUNCTION "Decod::genMealy"
  void Decod::genMealy (void)
  {
    log_printf(TRACE,Decod,FUNCTION,"Begin");

    //-----------------------------------
    // Initialization
    //-----------------------------------
    Tcontrol_t context_event_val;
    Tcontrol_t ifetch_ack [_param->_nb_context][_param->_max_nb_inst_fetch];
    for (uint32_t i=0; i<_param->_nb_context; i++)
      for (uint32_t j=0; j<_param->_nb_inst_fetch[i]; j++)
        ifetch_ack [i][j] = false;

    Tcontrol_t predict_val [_param->_nb_inst_decod];
    Tcontrol_t decod_val   [_param->_nb_inst_decod];
    for (uint32_t i=0; i<_param->_nb_inst_decod; i++)
      {
        decod_val   [i] = false;
      }

    Tcontrol_t can_continue      [_param->_nb_context];
    Tcontrol_t can_continue_next [_param->_nb_context];    

    for (uint32_t i=0; i<_param->_nb_context; i++)
      {
        internal_CONTEXT_HAVE_TRANSACTION [i] = false;
        internal_CONTEXT_ADDRESS_PREVIOUS [i] = reg_CONTEXT_ADDRESS_PREVIOUS [i];
        internal_CONTEXT_IS_DELAY_SLOT    [i] = reg_CONTEXT_IS_DELAY_SLOT    [i];

        can_continue                      [i] = PORT_READ(in_CONTEXT_DECOD_ENABLE [i]);
        can_continue_next                 [i] = PORT_READ(in_CONTEXT_DECOD_ENABLE [i]);
      }
    
    //-----------------------------------
    // Loop of decod
    //-----------------------------------
    // scan all decod "slot_out"
    std::list<select_t>::iterator it=select.begin();
    for (uint32_t i=0; i<_param->_nb_inst_decod; i++)
      {
        while ((it != select.end())     and  // have a no scanned "slot_in" ?
               (decod_val [i] == false) and  // have not a previous selected entry?
               (context_event_val == false)) // Have not a context_event (spr_access, exception, ...)
          {
            predict_val [i] = false;
            context_event_val = false;

            Tcontext_t x = it->_context ;
            uint32_t   y = it->_inst_fetch;

            // Test if this instruction is valid
            if ((PORT_READ(in_IFETCH_VAL [x][y]) == 1) and // entry is valid
                (can_continue [x]                == 1))    // context can decod instruction (have not a previous event)
              {
                can_continue      [x] = can_continue_next [x];

                decod_val  [i]    = true;                        // fetch_val and decod_enable 
                ifetch_ack [x][y] = PORT_READ(in_DECOD_ACK [i]); // fetch_val and decod_enable and decod_ack

                Tgeneral_data_t addr = PORT_READ(in_IFETCH_ADDRESS [x])+4*y;

                _decod_instruction->_instruction      = PORT_READ(in_IFETCH_INSTRUCTION [x][y]);
                _decod_instruction->_context_id       = x;
                _decod_instruction->_address_previous = internal_CONTEXT_ADDRESS_PREVIOUS [x];
                _decod_instruction->_address          = addr; //Compute the current address
                _decod_instruction->_address_next     = addr+4;
                _decod_instruction->_is_delay_slot    = internal_CONTEXT_IS_DELAY_SLOT [x];

                // Decod !
                log_printf(TRACE,Decod,FUNCTION,"DECOD [%d]",i);
                log_printf(TRACE,Decod,FUNCTION,"  * context       : %d",x);
                log_printf(TRACE,Decod,FUNCTION,"  * fetch         : %d",y);
                log_printf(TRACE,Decod,FUNCTION,"  * address       : %.8x",addr);
                log_printf(TRACE,Decod,FUNCTION,"  * is_delay_slot : %d",internal_CONTEXT_IS_DELAY_SLOT [x]);
                instruction_decod (_decod_instruction, _decod_param[x]);

                Ttype_t type = _decod_instruction->_type;

                if (_param->_have_port_context_id)
                PORT_WRITE(out_DECOD_CONTEXT_ID    [i], x);
                if (_param->_have_port_depth)
                PORT_WRITE(out_DECOD_DEPTH         [i], PORT_READ(in_CONTEXT_DEPTH [x]));
                PORT_WRITE(out_DECOD_TYPE          [i], type);
                PORT_WRITE(out_DECOD_OPERATION     [i], _decod_instruction->_operation     );
                PORT_WRITE(out_DECOD_IS_DELAY_SLOT [i], _decod_instruction->_is_delay_slot );
                PORT_WRITE(out_DECOD_ADDRESS       [i], addr);
                PORT_WRITE(out_DECOD_HAS_IMMEDIAT  [i], _decod_instruction->_has_immediat  );
                PORT_WRITE(out_DECOD_IMMEDIAT      [i], _decod_instruction->_immediat      );
                PORT_WRITE(out_DECOD_READ_RA       [i], _decod_instruction->_read_ra       );
                PORT_WRITE(out_DECOD_NUM_REG_RA    [i], _decod_instruction->_num_reg_ra    );
                PORT_WRITE(out_DECOD_READ_RB       [i], _decod_instruction->_read_rb       );
                PORT_WRITE(out_DECOD_NUM_REG_RB    [i], _decod_instruction->_num_reg_rb    );
                PORT_WRITE(out_DECOD_READ_RC       [i], _decod_instruction->_read_rc       );
                PORT_WRITE(out_DECOD_NUM_REG_RC    [i], _decod_instruction->_num_reg_rc    );
                PORT_WRITE(out_DECOD_WRITE_RD      [i], _decod_instruction->_write_rd      );
                PORT_WRITE(out_DECOD_NUM_REG_RD    [i], _decod_instruction->_num_reg_rd    );
                PORT_WRITE(out_DECOD_WRITE_RE      [i], _decod_instruction->_write_re      );
                PORT_WRITE(out_DECOD_NUM_REG_RE    [i], _decod_instruction->_num_reg_re    );
                PORT_WRITE(out_DECOD_EXCEPTION_USE [i], _decod_instruction->_exception_use );

                if (type == TYPE_BRANCH)
                  {
                    predict_val [i]     = ifetch_ack  [x][y] // and decod_val [i]
                      ;
                    decod_val   [i]    &= PORT_READ(in_PREDICT_ACK [i]);// predict_ack and fetch_val and decod_enable               
                    ifetch_ack  [x][y] &= PORT_READ(in_PREDICT_ACK [i]);// predict_ack and fetch_val and decod_enable and decod_ack

                    if (_param->_have_port_context_id)
                    PORT_WRITE(out_PREDICT_CONTEXT_ID                  [i],x);
                    PORT_WRITE(out_PREDICT_MATCH_INST_IFETCH_PTR       [i],y == ((_param->_have_port_inst_ifetch_ptr)?PORT_READ(in_IFETCH_INST_IFETCH_PTR [x]):0));
                    PORT_WRITE(out_PREDICT_BRANCH_STATE                [i],PORT_READ(in_IFETCH_BRANCH_STATE                [x]));
                    if (_param->_have_port_branch_update_prediction_id)
                    PORT_WRITE(out_PREDICT_BRANCH_UPDATE_PREDICTION_ID [i],PORT_READ(in_IFETCH_BRANCH_UPDATE_PREDICTION_ID [x]));
                    PORT_WRITE(out_PREDICT_BRANCH_CONDITION            [i],_decod_instruction->_branch_condition  );
//                  PORT_WRITE(out_PREDICT_BRANCH_STACK_WRITE          [i],_decod_instruction->_branch_stack_write);
                    PORT_WRITE(out_PREDICT_BRANCH_DIRECTION            [i],_decod_instruction->_branch_direction  );
                    PORT_WRITE(out_PREDICT_ADDRESS_SRC                 [i],_decod_instruction->_address           );
                    PORT_WRITE(out_PREDICT_ADDRESS_DEST                [i],_decod_instruction->_address_next      );
                
                    //can_continue_next [x] = PORT_READ(in_PREDICT_CAN_CONTINUE [i]); // can continue is set if direction is "not take" (also, continue is sequential order)
                    can_continue_next [x] = false; // one branch per context
                  }

                Tevent_type_t event_type = _decod_instruction->_event_type;
                if (event_type != EVENT_TYPE_NONE)
                  {
                    // speculative jump at the exception handler
                    // if type = TYPE_BRANCH, also event_type == EVENT_TYPE_NONE
                    context_event_val   = ifetch_ack  [x][y] // and decod_val [i]
                      ;
                    decod_val   [i]    &= PORT_READ(in_CONTEXT_EVENT_ACK);// context_event_ack and fetch_val and decod_enable             
                    ifetch_ack  [x][y] &= PORT_READ(in_CONTEXT_EVENT_ACK);// context_event_ack and fetch_val and decod_enable and decod_ack

                    if (_param->_have_port_context_id)
                    PORT_WRITE(out_CONTEXT_EVENT_CONTEXT_ID   , x);
                    PORT_WRITE(out_CONTEXT_EVENT_TYPE         , _decod_instruction->_event_type    );
                    PORT_WRITE(out_CONTEXT_EVENT_IS_DELAY_SLOT, _decod_instruction->_is_delay_slot );
                    PORT_WRITE(out_CONTEXT_EVENT_ADDRESS      , _decod_instruction->_address       );
                    PORT_WRITE(out_CONTEXT_EVENT_ADDRESS_EPCR , _decod_instruction->_address_next  );
                  }

                // fetch_ack = 
                //   ((event_type == EVENT_TYPE_NONE) or ((event_type != EVENT_TYPE_NONE) and context_event_ack)) and
                //   ((type       == TYPE_BRANCH    ) or ((type       != TYPE_BRANCH    ) and predict_ack      )) and
                //   fetch_val and decod_ack and decod_enable and true (is decod_val)

                // To compute the "next previous" address
                Tcontrol_t have_transaction = ifetch_ack [x][y];

                internal_CONTEXT_HAVE_TRANSACTION [x] |= have_transaction;
                if (have_transaction)
                  {
#ifdef STATISTICS
                    (*_stat_sum_inst_decod) ++;
#endif
                    internal_CONTEXT_ADDRESS_PREVIOUS [x] = addr;
                    internal_CONTEXT_IS_DELAY_SLOT    [x] = (type == TYPE_BRANCH); // next is a delay slot if current have branch type
                  }

                can_continue [x] &= have_transaction; // to have a in order decod !!! if a previous instruction can decod, also next instruction can't decod.
              }
            
            it ++;
          }
      }

    //-----------------------------------
    // Write output
    //-----------------------------------

    for (uint32_t i=0; i<_param->_nb_context; i++)
      for (uint32_t j=0; j<_param->_nb_inst_fetch[i]; j++)
        PORT_WRITE(out_IFETCH_ACK [i][j], ifetch_ack [i][j]);

    PORT_WRITE(out_CONTEXT_EVENT_VAL, context_event_val);

    for (uint32_t i=0; i<_param->_nb_inst_decod; i++)
      {
        PORT_WRITE(out_PREDICT_VAL [i], predict_val [i]);
        PORT_WRITE(out_DECOD_VAL   [i], decod_val   [i]);
      }

    log_printf(FUNC,Decod,FUNCTION,"End");
  };

}; // end namespace decod
}; // end namespace decod_unit
}; // end namespace front_end
}; // end namespace multi_front_end
}; // end namespace core

}; // end namespace behavioural
}; // end namespace morpheo              
#endif