source: trunk/IPs/systemC/processor/Morpheo/Behavioural/Core/Multi_Front_end/Front_end/Ifetch_unit/Ifetch_queue/src/Ifetch_queue_transition.cpp @ 88

#ifdef SYSTEMC
/*
 * $Id: Ifetch_queue_transition.cpp 88 2008-12-10 18:31:39Z rosiere $
 *
 * [ Description ]
 * 
 */

#include "Behavioural/Core/Multi_Front_end/Front_end/Ifetch_unit/Ifetch_queue/include/Ifetch_queue.h"

namespace morpheo                    {
namespace behavioural {
namespace core {
namespace multi_front_end {
namespace front_end {
namespace ifetch_unit {
namespace ifetch_queue {


#undef  FUNCTION
#define FUNCTION "Ifetch_queue::transition"
  void Ifetch_queue::transition (void)
  {
    log_begin(Ifetch_queue,FUNCTION);

    if (PORT_READ(in_NRESET) == 0)
      {
        reg_PTR_READ  = 0;
        reg_PTR_WRITE = 0;

        for (uint32_t i=0; i<_param->_size_queue; i++)
          _queue [i]->_state = IFETCH_QUEUE_STATE_EMPTY;
      }
    else
      {
        // ==========================================================
        // =====[ ADDRESS ]==========================================
        // ==========================================================
        if (PORT_READ(in_ADDRESS_VAL) and internal_ADDRESS_ACK)
          {
            // New slot in ifetch_queue is allocated
            
            _queue[reg_PTR_WRITE]->_state                       = IFETCH_QUEUE_STATE_WAIT_RSP;
              
#ifdef STATISTICS
            if (usage_is_set(_usage,USE_STATISTICS))
              (*_sum_transaction_address) ++;
#endif

            for (uint32_t i=0; i<_param->_nb_instruction; i++)
              {
                Tcontrol_t enable = PORT_READ(in_ADDRESS_INSTRUCTION_ENABLE [i]);
#ifdef STATISTICS
                if (usage_is_set(_usage,USE_STATISTICS))
                  (*_sum_inst_enable) += enable;
#endif
                _queue[reg_PTR_WRITE]->_instruction_enable [i]      = enable;
              }

            _queue[reg_PTR_WRITE]->_address                     = PORT_READ(in_ADDRESS_INSTRUCTION_ADDRESS        );
            _queue[reg_PTR_WRITE]->_inst_ifetch_ptr             = (_param->_have_port_inst_ifetch_ptr)?PORT_READ(in_ADDRESS_INST_IFETCH_PTR            ):0;
            _queue[reg_PTR_WRITE]->_branch_state                = PORT_READ(in_ADDRESS_BRANCH_STATE               );
            _queue[reg_PTR_WRITE]->_branch_update_prediction_id = (_param->_have_port_depth)?PORT_READ(in_ADDRESS_BRANCH_UPDATE_PREDICTION_ID):0;
            
            reg_PTR_WRITE = (reg_PTR_WRITE+1)%_param->_size_queue;
          }

        // ==========================================================
        // =====[ DECOD ]============================================
        // ==========================================================
        bool have_instruction_decod  = false;
        bool have_instruction_enable = false;
        for (uint32_t i=0; i<_param->_nb_instruction; i++)
          {
            if (internal_DECOD_VAL [i] and PORT_READ(in_DECOD_ACK[i]))
              {
                have_instruction_decod = true;
                _queue[reg_PTR_READ]->_instruction_enable [i] = false;
              }
            have_instruction_enable |= _queue[reg_PTR_READ]->_instruction_enable [i];
          }

        // Test if all is decoded
        if (have_instruction_decod and not have_instruction_enable)
          {
            // all is decod
            _queue[reg_PTR_READ]->_state = IFETCH_QUEUE_STATE_EMPTY;
            reg_PTR_READ = (reg_PTR_READ+1)%_param->_size_queue;
          }
          
        // ==========================================================
        // =====[ ICACHE_RSP ]=======================================
        // ==========================================================
        if (PORT_READ(in_ICACHE_RSP_VAL) and internal_ICACHE_RSP_ACK)
          {
            Tpacket_t ptr = (_param->_have_port_ifetch_queue_ptr)?PORT_READ(in_ICACHE_RSP_PACKET_ID):0;
            
            for (uint32_t i=0; i<_param->_nb_instruction; i++)
              _queue[ptr]->_instruction [i]      = PORT_READ(in_ICACHE_RSP_INSTRUCTION [i]);
            
            switch (PORT_READ(in_ICACHE_RSP_ERROR))
              {
              case ICACHE_ERROR_NONE      : _queue[ptr]->_exception = EXCEPTION_IFETCH_NONE     ; break;
              case ICACHE_ERROR_BUS_ERROR : _queue[ptr]->_exception = EXCEPTION_IFETCH_BUS_ERROR; break;
              default : ERRORMORPHEO(FUNCTION,"icache_rsp_error : unknow value.");
              }

            switch (_queue[ptr]->_state)
              {
              case IFETCH_QUEUE_STATE_WAIT_RSP       : _queue[ptr]->_state = IFETCH_QUEUE_STATE_HAVE_RSP; break;
              case IFETCH_QUEUE_STATE_ERROR_WAIT_RSP : _queue[ptr]->_state = IFETCH_QUEUE_STATE_EMPTY   ; break;
              default : ERRORMORPHEO(FUNCTION,"icache_rsp : invalid ifetch_queue state.");
              }
          }

        // ==========================================================
        // =====[ EVENT_RESET ]======================================
        // ==========================================================
        if (PORT_READ(in_EVENT_RESET_VAL) and internal_EVENT_RESET_ACK)
          {
            // Scan all entry of queue and test the status
            for (uint32_t i=0; i<_param->_size_queue; i++)
              switch (_queue[i]->_state)
              {
              case IFETCH_QUEUE_STATE_ERROR_WAIT_RSP :                                                        break;
              case IFETCH_QUEUE_STATE_WAIT_RSP       : _queue[i]->_state = IFETCH_QUEUE_STATE_ERROR_WAIT_RSP; break;
              default                                : _queue[i]->_state = IFETCH_QUEUE_STATE_EMPTY         ; break;
              }

            // all entry is empty (or wait respons to flush)
            // reset ptr
            //   1) reg_PTR_READ = reg_PTR_WRITE =  = 0
            //   2) reg_PTR_READ = reg_PTR_WRITE
            // In method 1), the probalitie than the entry pointed by reg_PTR_WRITE is a slot with state "error_wait_rsp" is more importate that the method 2)
            reg_PTR_READ = reg_PTR_WRITE;
          }

#if defined(DEBUG) and (DEBUG >= DEBUG_TRACE)
        log_printf(TRACE,Ifetch_queue,FUNCTION,"  * Dump ifetch_queue");
        log_printf(TRACE,Ifetch_queue,FUNCTION,"    * reg_PTR_WRITE : %d",reg_PTR_WRITE);
        log_printf(TRACE,Ifetch_queue,FUNCTION,"    * reg_PTR_READ  : %d",reg_PTR_READ );
        for (uint32_t i=0; i<_param->_size_queue; i++)
          {
            log_printf(TRACE,Ifetch_queue,FUNCTION,"    * [%d] %s %.8x %d - %d %d %d", i, toString(_queue [i]->_state).c_str(), _queue [i]->_address,_queue [i]->_inst_ifetch_ptr,_queue [i]->_branch_state,_queue [i]->_branch_update_prediction_id,_queue [i]->_exception);
            
            for (uint32_t j=0; j<_param->_nb_instruction; j++)
              log_printf(TRACE,Ifetch_queue,FUNCTION,"      * %d %.8x", _queue [i]->_instruction_enable[j], _queue [i]->_instruction[j]);
          }
#endif

#ifdef STATISTICS
        if (usage_is_set(_usage,USE_STATISTICS))
          for (uint32_t i=0; i<_param->_size_queue; i++)
            switch (_queue[i]->_state)
              {
              case IFETCH_QUEUE_STATE_EMPTY          : break;
              case IFETCH_QUEUE_STATE_WAIT_RSP       : (*_sum_use_queue_wait_rsp      ) ++; break;
              case IFETCH_QUEUE_STATE_HAVE_RSP       : (*_sum_use_queue_have_rsp      ) ++; break;
              case IFETCH_QUEUE_STATE_ERROR_WAIT_RSP : (*_sum_use_queue_error_wait_rsp) ++; break;
              default : break;
              }
#endif
      }
    
#if defined(STATISTICS) or defined(VHDL_TESTBENCH)
    end_cycle ();
#endif

    log_end(Ifetch_queue,FUNCTION);
  };

}; // end namespace ifetch_queue
}; // end namespace ifetch_unit
}; // end namespace front_end
}; // end namespace multi_front_end
}; // end namespace core

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