func (this *Decoder) Run(input, output channel.Channel) {
// Launch each unit as a goroutine
logger.Print(" => Initializing decoder unit %d", this.Index())
go func() {
for {
value, running := <-input.Channel()
if !running || !this.IsActive() {
logger.Print(" => Flushing decoder unit %d", this.Index())
return
}
op := operation.Cast(value)
// Iterate instructions received via the channel
instruction, err := this.decodeInstruction(op)
if err != nil {
logger.Error(err.Error())
break
}
// Send data to output
op.SetInstruction(instruction)
output.Add(op)
// Release one item from input Channel
input.Release()
}
}()
}
func (this *Executor) Run(input map[info.CategoryEnum]channel.Channel, commonDataBus channel.Channel) {
// Launch each unit as a goroutine
unit, event := this.getUnitFromCategory(this.Category())
logger.Print(" => Initializing execution unit (%s) %d", this.Category(), this.Index())
go func() {
for {
value, running := <-input[this.Category()].Channel()
if !running || !this.IsActive() {
logger.Print(" => Flushing execution unit (%s) %d", this.Category(), this.Index())
return
}
op := operation.Cast(value)
for i := uint8(0); i < op.Instruction().Info.Cycles; i++ {
this.Processor().Wait(1)
}
// Iterate instructions received via the channel
op, _ = this.executeOperation(unit, event, op)
// Send data to common bus for reservation station feedback
commonDataBus.Add(op)
// Release one item from input Channel
input[this.Category()].Release()
}
}()
}
func (this *Dispatcher) runDispatcherToReservationStation(input channel.Channel,
rs *reservationstation.ReservationStation, rat *registeraliastable.RegisterAliasTable, rob *reorderbuffer.ReorderBuffer) {
incomingQueue := map[uint32]*operation.Operation{}
currentOperationId := this.StartOperationId()
// For each operation received to schedule, process it
for {
value, running := <-input.Channel()
if !running || !this.IsActive() {
logger.Print(" => Flushing dispatcher unit %d (dispatcher to RS)", this.Index())
return
}
op := operation.Cast(value)
// Add to current operation
incomingQueue[op.Id()] = op
// Send to incoming channel pending ops (if available)
for op, exists := incomingQueue[currentOperationId]; exists; op, exists = incomingQueue[currentOperationId] {
// Allocate in ROB if there is spacde, otherwise stall
rob.Allocate(op)
// Rename register in case of WAR & WAR hazards
if this.RegisterAliasTableEntries() > 0 {
_, destRegister := rs.GetDestinationDependency(op.Id(), op.Instruction())
if destRegister != -1 {
found, _ := rat.AddMap(uint32(destRegister), op.Id())
if !found {
// Need to stall for an available RAT entry
logger.Collect(" => [DI%d][%03d]: No entry available in RAT. Wait for one...", this.Index(), op.Id())
break
}
// Rename to physical registers
this.renameRegisters(op.Id(), op, rat)
}
}
//Redirect input operations to the required execution unit channels
logger.Collect(" => [DI%d][%03d]: Scheduling to RS: %s, %s", this.Index(), op.Id(), op.Instruction().Info.ToString(), op.Instruction().Data.ToString())
rs.Schedule(op)
currentOperationId += 1
}
input.Release()
}
}
func (this *Processor) RunRecovery(recoveryChannel channel.Channel, flushFunc func()) {
for value := range recoveryChannel.Channel() {
op := operation.Cast(value)
logger.Collect(" => Recovering at OpId: %d and Address: %#04X", op.Id(), op.Address())
logger.SetVerboseQuiet(true)
// Flush pipeline
flushFunc()
// Clean logs
this.RemoveForwardLogs(op.Id() - 1)
// Clear speculative jumps
this.ClearSpeculativeJumps()
// Start pipeline from the recovery address
flushFunc = this.StartPipelineUnits(this.Config(), recoveryChannel, op.Id(), op.Address())
// Release value from channel
recoveryChannel.Release()
}
}
func (this *ReservationStation) runCommonBusListener(commonDataBus channel.Channel) {
// For each operation executed, feed reservation station to release operands
for {
value, running := <-commonDataBus.Channel()
if !running {
this.reservationStation.isActive = false
logger.Print(" => Flushing reservation station unit %d (CDB listener)", this.Index())
return
}
op := operation.Cast(value)
commonDataBus.Release()
this.Lock() <- true
dest, _, _ := this.getComponentsFromInstruction(op.Instruction())
entryIndex := this.getEntryIndexFromOperationId(op.Id())
entryOp := this.Entries()[entryIndex]
logger.Collect(" => [RS%d][%03d]: Operation completed, releasing entry %d", this.Index(), op.Id(), entryIndex)
if entryIndex != INVALID_INDEX {
// Release entry
this.Entries()[entryIndex].Busy = false
this.Entries()[entryIndex].Free = true
// Release entry from reservation station queue
this.Input().Release()
}
// Release destination register (as RAT if enabled)
if dest != INVALID_INDEX {
logger.Collect(" => [RS%d][%03d]: Register %v resolved", this.Index(), op.Id(), entryOp.Destination)
this.releaseOperation(entryOp.Destination)
}
// Release operands registers
for _, operand := range entryOp.Operands {
if operand.IsValid() && (operand.Type == MemoryType || len(this.RegisterAliasTable().Entries()) == 0) {
logger.Collect(" => [RS%d][%03d]: Register %v resolved", this.Index(), op.Id(), operand)
this.releaseOperation(operand)
}
}
<-this.Lock()
}
}
func (this *Fetcher) Run(input, output channel.Channel) {
logger.Print(" => Initializing fetcher unit %d", this.Index())
// Launch each unit as a goroutine
go func() {
for {
value, running := <-input.Channel()
if !running || !this.IsActive() {
logger.Print(" => Flushing fetcher unit %d", this.Index())
return
}
// Release item from input Channel
input.Release()
// Initial operation (address)
op := operation.Cast(value)
// Load instructions data from memory
data := this.Processor().InstructionsMemory().Load(op.Address(), consts.BYTES_PER_WORD*this.InstructionsFetchedPerCycle())
// Fetch instructions
startCycles := this.Processor().Cycles()
operations, err := this.fetchInstructions(op, data, input)
if err != nil {
logger.Error(err.Error())
break
}
// Wait cycles of a fetch stage
this.Processor().Wait(consts.FETCH_CYCLES)
// After wait cycle, notify decode channel with new operations
for _, op := range operations {
if this.IsActive() {
this.Processor().LogEvent(consts.FETCH_EVENT, this.Index(), op.Id(), startCycles)
output.Add(op)
}
}
}
}()
}
func (this *ReservationStation) runScheduler() {
// For each operation received to schedule, process it
for {
value, running := <-this.Input().Channel()
if !running {
this.reservationStation.isActive = false
logger.Print(" => Flushing reservation station unit %d (scheduler)", this.Index())
return
}
this.Lock() <- true
op := operation.Cast(value)
// Get next entry free
entryIndex := this.getNextIndexFreeEntry()
dest, valueOperands, memoryOperands := this.getComponentsFromInstruction(op.Instruction())
// Convert to operand objects
ops := []Operand{}
for _, register := range memoryOperands {
ops = append(ops, newMemoryOp(register))
}
for _, register := range valueOperands {
ratEntry, ok := this.RegisterAliasTable().GetPhysicalRegister(op.Id()-1, uint32(register))
if ok {
ops = append(ops, newRegisterRatOp(register, int32(ratEntry)))
} else {
ops = append(ops, newRegisterOp(register))
}
}
// Rat Dest
regDestRat := newNilDep()
if dest != INVALID_INDEX {
if op.RenamedDestRegister() != INVALID_INDEX {
regDestRat = newRegisterRatOp(dest, op.RenamedDestRegister())
} else {
regDestRat = newRegisterOp(dest)
}
}
dependencies := this.getDependencies(op.Id(), regDestRat, ops)
logger.Collect(" => [RS%d][%03d]: Adding op to entry %d [D: %v, O's: %v, V's: %v] ..",
this.Index(), op.Id(), entryIndex, regDestRat, ops, dependencies)
// Store entry depency into reservation station
this.Entries()[entryIndex] = RsEntry{
Operation: op,
Destination: regDestRat,
Operands: ops,
Dependencies: dependencies,
Free: false,
Busy: false,
}
// If no waiting dependencies, release and execute
if len(dependencies) == 0 {
this.dispatchOperation(EntryIndex(entryIndex), op)
}
<-this.Lock()
}
}
