TLM-BUS_1_phase.zip_TLM_systemc tlm

/***************************************************************************** The following code is derived, directly or indirectly, from the SystemC source code Copyright (c) 1996-2008 by all Contributors. All Rights reserved. The contents of this file are subject to the restrictions and limitations set forth in the SystemC Open Source License Version 3.0 (the "License"); You may not use this file except in compliance with such restrictions and limitations. You may obtain instructions on how to receive a copy of the License at http://www.systemc.org/. Software distributed by Contributors under the License is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the specific language governing rights and limitations under the License. *****************************************************************************/ //============================================================================= /// @file select_initiator.cpp /// @Details Implements a AT non blocking initiator // //============================================================================= // Original Authors: // Bill Bunton, ESLX // Charles Wilson, ESLX // Anna Keist, ESLX //============================================================================= #include "reporting.h" // Reporting convenience macros #include "select_initiator.h" // Our header #include "tlm.h" // TLM headers using namespace sc_core; static const char *filename = "select_initiator.cpp"; /// filename for reporting //============================================================================= ///Constructor select_initiator::select_initiator // constructor ( sc_module_name name // module name , const unsigned int ID // initiator ID , sc_core::sc_time end_rsp_delay // delay ) : sc_module (name) /// init module name , initiator_socket ("initiator_socket") /// init socket name , m_send_end_rsp_PEQ ("send_end_rsp_PEQ") /// init PEQ name , m_ID (ID) /// init initiator ID , m_end_rsp_delay (end_rsp_delay) /// init end response delay { m_enable_target_tracking = true; /// init style tracking mode???? // bind initiator to the export initiator_socket (*this); // register thread process SC_THREAD(initiator_thread); // register method process SC_METHOD(send_end_rsp_method) sensitive << m_send_end_rsp_PEQ.get_event(); dont_initialize(); } //============================================================================= // // Initiator thread // //============================================================================= void select_initiator::initiator_thread(void) // initiator thread { tlm::tlm_generic_payload *transaction_ptr; // transaction pointer std::ostringstream msg; // log message while (true) { //============================================================================= // Read FIFO to Get new transaction GP from the traffic generator //============================================================================= transaction_ptr = request_in_port->read(); // get request from input fifo //怎么一直读不判断？？ //是读fifo，有缓冲函数，这里可能就yield了; tlm::tlm_phase phase = tlm::BEGIN_REQ; // Create phase objects sc_time delay = SC_ZERO_TIME; // Create delay objects std::ostringstream msg; // log message msg.str(""); msg << "Initiator: " << m_ID << " starting new transaction" << " for Addr:0x" << hex << setw(8) << setfill('0') << uppercase << transaction_ptr->get_address() << endl << " " ; msg << "Initiator: " << dec << m_ID << " nb_transport_fw (GP, " << report::print(phase) << ", " << delay << ")"; REPORT_INFO(filename, __FUNCTION__, msg.str()); //----------------------------------------------------------------------------- // Make the non-blocking call and decode returned status (tlm_sync_enum) //----------------------------------------------------------------------------- tlm::tlm_sync_enum return_value = initiator_socket->nb_transport_fw(*transaction_ptr, phase, delay); //直接return了？？这里边延时怎么实现的？？; //nb的，当然要实时返回，然后读return_value，phase和delay; msg.str(""); msg << "Initiator: " << m_ID << " " << report::print(return_value) << " (GP, " << report::print(phase) << ", " << delay << ")" << endl; switch (return_value) { //----------------------------------------------------------------------------- // The target returned COMPLETED this is a single phase transaction // Wait the annotated delay // Return the transaction to the traffic generator //----------------------------------------------------------------------------- case tlm::TLM_COMPLETED: { wait(delay + m_end_rsp_delay); // wait the annotated delay msg << " " << "Initiator: " << m_ID << " target returned COMPLETED with annotated time "; REPORT_INFO (filename, __FUNCTION__, msg.str() ); response_out_port->write(transaction_ptr); // return txn to traffic gen break; }// end case TLM_COMPLETED //----------------------------------------------------------------------------- // Target returned UPDATED this will be 2 phase transaction // Add the transaction pointer to the waiting backward path map // Set tracking enum to Rcved_UPDATED // Wait the annotated delay //----------------------------------------------------------------------------- case tlm::TLM_UPDATED: { if( phase == tlm::END_REQ) { ////////////？？可能target让稍等，这里没有货了？？就加map里去备用。加map里的作用就是存从前的phase; if (m_enable_target_tracking) { //////////干什么的！！！不知道！！; m_waiting_bw_path_map.insert(make_pair(transaction_ptr ,Rcved_UPDATED_enum )); } else { m_waiting_bw_path_map.insert(make_pair(transaction_ptr ,Rcved_END_REQ_enum )); } wait(delay); // wait the annotated delay msg << " " << "Initiator: " << m_ID << " transaction waiting begin-response on backward path"; REPORT_INFO (filename, __FUNCTION__, msg.str() ); } else if( phase == tlm::BEGIN_RESP) { // } else { msg << " " << "Initiator: " << m_ID << " Unexpected phase for UPDATED return from target "; REPORT_FATAL (filename, __FUNCTION__, msg.str() ); } break; } // end case TLM_UPDATED //----------------------------------------------------------------------------- // Target returned ACCEPTED this will be 4 phase transaction // Add the transaction pointer to the waiting backward path map // Set tracking enum to Rcved_END_REQ // When the END REQUEST RULE is active wait for the target to response //----------------------------------------------------------------------------- case tlm::TLM_ACCEPTED: { msg << " " << "Initiator: " << m_ID << " transaction waiting end-request on backward-path "; REPORT_INFO (filename, __FUNCTION__, msg.str