119 lines
4.2 KiB
C++
119 lines
4.2 KiB
C++
/*
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* Copyright (c) 2019, University of Kaiserslautern
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER
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* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Author: Lukas Steiner
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*/
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#include "BankMachine.h"
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BankMachine::BankMachine(SchedulerIF *scheduler, CheckerIF *checker, Bank bank)
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: scheduler(scheduler), checker(checker), bank(bank) {}
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sc_time BankMachine::startBankMachine()
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{
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if (currentPayload == nullptr)
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{
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currentPayload = scheduler->getNextRequest(bank, this);
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if (currentPayload == nullptr)
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return SC_ZERO_TIME;
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}
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sc_time delay;
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DramExtension extension = DramExtension::getExtension(currentPayload);
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if (currentState == BmState::Precharged) // row miss
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{
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delay = checker->delayToSatisfyConstraints(Command::ACT, bank);
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nextCommand = Command::ACT;
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nextRow = extension.getRow();
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timeToSchedule = sc_time_stamp() + delay;
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}
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else if (currentState == BmState::Activated)
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{
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if (extension.getRow() == currentRow) // row hit
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{
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if (currentPayload->get_command() == TLM_READ_COMMAND)
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{
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delay = checker->delayToSatisfyConstraints(Command::RD, bank);
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nextCommand = Command::RD;
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timeToSchedule = sc_time_stamp() + delay;
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}
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else if (currentPayload->get_command() == TLM_WRITE_COMMAND)
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{
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delay = checker->delayToSatisfyConstraints(Command::WR, bank);
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nextCommand = Command::WR;
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timeToSchedule = sc_time_stamp() + delay;
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}
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else
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SC_REPORT_FATAL("BankMachine", "Wrong TLM command");
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}
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else // row miss
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{
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delay = checker->delayToSatisfyConstraints(Command::PRE, bank);
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nextCommand = Command::PRE;
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nextRow = extension.getRow();
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timeToSchedule = sc_time_stamp() + delay;
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}
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}
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return delay;
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}
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std::pair<Command, tlm_generic_payload *> BankMachine::getNextCommand()
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{
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if (timeToSchedule == sc_time_stamp())
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return std::pair<Command, tlm_generic_payload *>(nextCommand, currentPayload);
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else
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return std::pair<Command, tlm_generic_payload *>(Command::NOP, nullptr);
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}
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void BankMachine::updateState(Command command)
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{
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if (command == Command::ACT)
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{
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currentState = BmState::Activated;
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currentRow = nextRow;
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}
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else if (command == Command::PRE)
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currentState = BmState::Precharged;
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else if (command == Command::RD || command == Command::WR)
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currentPayload = nullptr;
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else
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SC_REPORT_FATAL("BankMachine", "Unknown phase");
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}
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Row BankMachine::getOpenRow()
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{
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return currentRow;
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}
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BmState BankMachine::getState()
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{
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return currentState;
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}
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