BlocksLSU.cc

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/*
    Copyright (c) 2002-2021 Tampere University.
 
    This file is part of TTA-Based Codesign Environment (TCE).
 
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/**
 * @file BlocksLSU.cc
 *
 * Implementation of BlocksLSU Class.
 *  This class resembles a single output in the Blocks architecture.
 *
 * @author Maarten Molendijk 2020 (m.j.molendijk@tue.nl)
 * @author Kanishkan Vadivel 2021 (k.vadivel@tue.nl)
 */
#include "BlocksLSU.hh"
 
using namespace TTAMachine;
 
/**
 * BlocksLSU with default instructions
 *
 * @param mach The TTA machine where the LSU needs to be added.
 * @param name The name of the LSU.
 * @param sources A list of sources that are attached to this unit's input.
 * @param asData The address space containing the program data.
 * @param in1sock (shared) pointer to the TTA socket for in1 input port.
 * @param in2sock (shared) pointer to the TTA socket for in2 input port.
 */
BlocksLSU::BlocksLSU(
    Machine& mach, const std::string& name, std::list<std::string> sources,
    AddressSpace& asData, std::shared_ptr<TTAMachine::Socket> in1sock,
    std::shared_ptr<TTAMachine::Socket> in2sock)
    : BlocksFU::BlocksFU(mach, name, sources, in1sock, in2sock) {
    // Function unit and ports
    lsu = this->fu;
    // Set adress space to data
    lsu->setAddressSpace(&asData);
 
    // HWOps
    ops.push_back(CreateHWLoadOp("ld32"));
    ops.push_back(CreateHWLoadOp("ldu16"));
    ops.push_back(CreateHWLoadOp("ldu8"));
    ops.push_back(CreateHWStoreOp("st16"));
    ops.push_back(CreateHWStoreOp("st8"));
    ops.push_back(CreateHWStoreOp("st32"));
    ops.push_back(CreateHWLoadOp("copy"));
}
 
/**
 * Constructor for BlocksLSUPair
 *
 * @param mach The TTA machine where the LSU pair needs to be added.
 * @param name The name of the LSU pair.
 * @param sources A list of sources that are attached to this unit's input.
 * @param asData The address space containing the program data.
 * @param usesOut0 A boolean that indicates whether output port 0 of the FU is
 * used in the Blocks.
 * @param usesOut1 A boolean that indicates whether output port 1 of the FU is
 * used in the Blocks.
 */
BlocksLSUPair::BlocksLSUPair(
    TTAMachine::Machine& mach, const std::string& name,
    std::list<std::string> sources, TTAMachine::AddressSpace& asData,
    bool usesOut0, bool usesOut1)
    : sources(sources) {
    in1sock = std::make_shared<TTAMachine::Socket>(name + "_in1t");
    in2sock = std::make_shared<TTAMachine::Socket>(name + "_in2");
    mach.addSocket(*(in1sock.get()));
    mach.addSocket(*(in2sock.get()));
    if (usesOut0)
        lsu0.reset(new BlocksLSU(
            mach, name + "_out0", sources, asData, in1sock, in2sock));
    if (usesOut1)
        lsu1.reset(new BlocksLSU(
            mach, name + "_out1", sources, asData, in1sock, in2sock));
}
 
/**
 * Creates a hardware load operation.
 *
 * @param name The name of the hardware operation. This needs to exactly match
 * the name in OSEd.
 */
HWOperation*
BlocksLSU::CreateHWLoadOp(const std::string& name) {
    HWOperation* op = new HWOperation(name, *lsu);
    BindPorts(op, true);
    ConfigurePipeline(op->pipeline(), true);
    return op;
}
/**
 * Creates a hardware store operation.
 *
 * @param name The name of the hardware operation. This needs to exactly match
 * the name in OSEd.
 */
HWOperation*
BlocksLSU::CreateHWStoreOp(const std::string& name) {
    HWOperation* op = new HWOperation(name, *lsu);
    BindPorts(op, false);
    ConfigurePipeline(op->pipeline(), false);
    return op;
}
 
/**
 * Bind the operation's operands to FU ports.
 *
 * @param hwOp A pointer to the hardware operation of which the operands need
 * to be binded to FU ports.
 * @param isLoadOp A boolean that indicates whether the operation given is a
 * load operation(true) or store operation(false).
 */
void
BlocksLSU::BindPorts(TTAMachine::HWOperation* hwOp, bool isLoadOp) {
    if (isLoadOp) {               // Load operation
        hwOp->bindPort(1, *in1);  // Memory address to read
        hwOp->bindPort(2, *out);  // Data
    } else {                      // Store operation
        hwOp->bindPort(1, *in1);  // Memory address to write
        hwOp->bindPort(2, *in2);  // Data to write
    }
}
 
/**
 * Configure the operation pipeline.
 *
 * @param pipeline A pointer to the execution pipeline of the operation of
 * which the pipeline needs to be configured.
 * @param isLoadOp A boolean that indicates whether the operation given is a
 * load operation(true) or store operation(false).
 */
void
BlocksLSU::ConfigurePipeline(
    TTAMachine::ExecutionPipeline* pipeline, bool isLoadOp) {
    if (isLoadOp) {
        pipeline->addPortRead(1, 0, 1);
        pipeline->addPortWrite(2, 0, 1);
    } else {
        pipeline->addPortRead(1, 0, 1);
        pipeline->addPortRead(2, 0, 1);
    }
}