func New(assemblyFileName string, config *config.Config) (*Processor, error) {
p := &Processor{
&processor{
done: false,
instructionsFetched: []string{},
instructionsCompleted: []uint32{},
dataLog: map[uint32][]LogEvent{},
branchHistoryTable: map[uint32]uint32{},
conditionalBranches: 0,
unconditionalBranches: 0,
mispredictedBranches: 0,
noTakenBranches: 0,
branchPredictorBits: 0,
speculativeJumps: 0,
instructionsMap: map[uint32]string{},
instructionsSet: set.Init(),
config: config,
programCounter: 0,
registerMemory: memory.New(config.RegistersMemorySize()),
instructionMemory: memory.New(config.InstructionsMemorySize()),
dataMemory: memory.New(config.DataMemorySize()),
},
}
logger.Print(config.ToString())
// Instanciate functional units
instructionsFinished := func() bool {
return p.processor.done && p.InstructionsFetchedCounter() == p.InstructionsCompletedCounter() && p.SpeculativeJumps() == 0
}
p.processor.clockUnit = clock.New(config.CyclePeriod(), instructionsFinished)
err := p.loadInstructionsMemory(assemblyFileName)
if err != nil {
return p, err
}
return p, nil
}
func (this *Processor) StartPipelineUnits(config *config.Config, recoveryChannel channel.Channel, operationId, address uint32) func() {
// Initialize channels
addressChannel := channel.New(config.InstructionsFetchedPerCycle()) // Branch Predictor -> Fetch
instructionChannel := channel.New(config.InstructionsQueue()) // Fetch -> Decode
operationChannel := channel.New(config.InstructionsDecodedQueue()) // Decode -> Dispatch
executionChannels := map[info.CategoryEnum]channel.Channel{ // Dispatch -> Execute
info.Aritmetic: channel.New(config.AluUnits()),
info.LoadStore: channel.New(config.LoadStoreUnits()),
info.Control: channel.New(config.BranchUnits()),
info.FloatingPoint: channel.New(config.FpuUnits()),
}
commonDataBusChannel := channel.New(channel.INFINITE) // Execute -> Dispatcher (RS & ROB)
closeUnitsHandlers := []func(){}
/////////////////////////////////////////////////////////////////////////////
// Run stage units in parallel //
// - Units are executed as go routines https://blog.golang.org/pipelines) //
/////////////////////////////////////////////////////////////////////////////
// ---------- Fetch ------------ //
fe := fetcher.New(uint32(0), this, config.InstructionsFetchedPerCycle(), config.BranchPredictorType())
fe.Run(addressChannel, instructionChannel)
closeUnitsHandlers = append(closeUnitsHandlers, fe.Close)
// ---------- Decode ------------ //
for index := uint32(0); index < config.DecoderUnits(); index++ {
de := decoder.New(index, this)
de.Run(instructionChannel, operationChannel)
closeUnitsHandlers = append(closeUnitsHandlers, de.Close)
}
// ----- Dispatch / RS / ROB ---- //
di := dispatcher.New(uint32(0), this, operationId, config.TotalRegisters(),
config.ReservationStationEntries(), config.ReorderBufferEntries(), config.InstructionsDispatchedPerCycle(),
config.InstructionsWrittenPerCycle(), config.RegisterAliasTableEntries())
di.Run(operationChannel, executionChannels, commonDataBusChannel, recoveryChannel)
closeUnitsHandlers = append(closeUnitsHandlers, di.Close)
// ------- Execute (Alu) -------- //
for index := uint32(0); index < config.AluUnits(); index++ {
ex := executor.New(index, this, di.Bus(), info.Aritmetic)
ex.Run(executionChannels, commonDataBusChannel)
closeUnitsHandlers = append(closeUnitsHandlers, ex.Close)
}
// ---- Execute (Load Store) ---- //
for index := uint32(0); index < config.LoadStoreUnits(); index++ {
ex := executor.New(index, this, di.Bus(), info.LoadStore)
ex.Run(executionChannels, commonDataBusChannel)
closeUnitsHandlers = append(closeUnitsHandlers, ex.Close)
}
// ------ Execute (Branch) ------ //
for index := uint32(0); index < config.BranchUnits(); index++ {
ex := executor.New(index, this, di.Bus(), info.Control)
ex.Run(executionChannels, commonDataBusChannel)
closeUnitsHandlers = append(closeUnitsHandlers, ex.Close)
}
// ------- Execute (FPU) -------- //
for index := uint32(0); index < config.FpuUnits(); index++ {
ex := executor.New(index, this, di.Bus(), info.FloatingPoint)
ex.Run(executionChannels, commonDataBusChannel)
closeUnitsHandlers = append(closeUnitsHandlers, ex.Close)
}
// Set instruction for fetching to start pipeline
go addressChannel.Add(operation.New(operationId, address))
// Return flush function for all channels
return func() {
// Close units & channels
for _, closeUnitHandler := range closeUnitsHandlers {
closeUnitHandler()
}
// Close channels
addressChannel.Close()
instructionChannel.Close()
operationChannel.Close()
executionChannels[info.Aritmetic].Close()
executionChannels[info.LoadStore].Close()
executionChannels[info.Control].Close()
executionChannels[info.FloatingPoint].Close()
commonDataBusChannel.Close()
}
}