func (this *ReservationStation) dispatchOperation(entryIndex EntryIndex, op *operation.Operation) {
// Lock a slot in max quantity of instructions dispatcher per cycle
this.AddInstructionsFetchedStack()
// Release reservation station entry
this.Entries()[entryIndex].Busy = true
go func() {
// Release one entry and send operation to execution, when output channel (execution unit) is free
logger.Collect(" => [RS%d][%03d]: Sending entry %d to %s queue...", this.Index(), op.Id(), entryIndex, op.Instruction().Info.Category)
// Wait dispatch cycles
startCycles := this.Processor().Cycles()
this.Processor().Wait(consts.DISPATCH_CYCLES)
// Log completion
this.Processor().LogEvent(consts.DISPATCH_EVENT, this.Index(), op.Id(), startCycles)
// Send data to execution unit in a go routine, when execution unit is available
go this.Output()[op.Instruction().Info.Category].Add(op)
}()
}
func (this *Executor) executeOperation(unit IExecutor, event string, op *operation.Operation) (*operation.Operation, error) {
startCycles := this.Processor().Cycles()
// Do decode once a data instruction is received
var err error
op, err = unit.Process(op)
if err != nil {
return op, errors.New(fmt.Sprintf("Failed executing instruction. %s]", err.Error()))
}
// Wait cycles of a execution stage
logger.Collect(" => [%s%d][%03d]: Executing %s, %s", event, this.Index(), op.Id(), op.Instruction().Info.ToString(), op.Instruction().Data.ToString())
for i := uint8(0); i < op.Instruction().Info.Cycles; i++ {
this.Processor().Wait(1)
}
// Log completion
if this.IsActive() {
this.Processor().LogEvent(event, this.Index(), op.Id(), startCycles)
}
return op, nil
}
func (this *Fpu) Process(operation *operation.Operation) (*operation.Operation, error) {
instruction := operation.Instruction()
outputAddress, err := this.compute(operation, instruction.Info, instruction.Data)
if err != nil {
return operation, err
}
logger.Collect(" => [FPU][%03d]: [R%d(%#02X) = %#08X]", operation.Id(), outputAddress, outputAddress*consts.BYTES_PER_WORD, this.Result())
// Persist output data
this.Bus().StoreRegister(operation, outputAddress, this.Result())
return operation, nil
}
func (this *Alu) Process(operation *operation.Operation) (*operation.Operation, error) {
instruction := operation.Instruction()
// Clean Status
this.CleanStatus()
outputAddress, err := this.compute(operation, instruction.Info, instruction.Data)
if err != nil {
return operation, err
}
logger.Collect(" => [ALU][%03d]: [R%d(%#02X) = %#08X]", operation.Id(), outputAddress, outputAddress*consts.BYTES_PER_WORD, this.Result())
// Set status flags
this.SetStatusFlag(this.Result()%2 == 0, consts.FLAG_PARITY)
this.SetStatusFlag(this.Result() == 0, consts.FLAG_ZERO)
this.SetStatusFlag(getSign(this.Result()), consts.FLAG_SIGN)
// Persist output data
this.Bus().StoreRegister(operation, outputAddress, this.Result())
return operation, nil
}
func (this *Branch) Process(operation *operation.Operation) (*operation.Operation, error) {
instruction := operation.Instruction()
info := instruction.Info
operands := instruction.Data
switch info.Type {
case data.TypeI:
registerD := operands.(*data.DataI).RegisterD.ToUint32()
op1 := this.Bus().LoadRegister(operation, registerD)
registerS := operands.(*data.DataI).RegisterS.ToUint32()
op2 := this.Bus().LoadRegister(operation, registerS)
logger.Collect(" => [BR][%03d]: [R%d(%#02X) = %#08X ? R%d(%#02X) = %#08X]",
operation.Id(), registerD, registerD*consts.BYTES_PER_WORD, op1, registerS, registerS*consts.BYTES_PER_WORD, op2)
taken, err := processOperation(op1, op2, info.Opcode)
if err != nil {
return operation, nil
}
operation.SetBranchResult(taken)
if taken {
offsetAddress := ComputeOffsetTypeI(operands)
this.Bus().IncrementProgramCounter(operation, offsetAddress)
logger.Collect(" => [BR][%03d]: [PC(offset) = 0x%06X", operation.Id(), offsetAddress)
} else {
// Notify ROB
this.Bus().IncrementProgramCounter(operation, 0)
}
case data.TypeJ:
address := ComputeAddressTypeJ(operands)
this.Bus().SetProgramCounter(operation, uint32(address-consts.BYTES_PER_WORD))
logger.Collect(" => [BR][%03d]: [Address = %06X]", operation.Id(), address)
default:
return operation, errors.New(fmt.Sprintf("Invalid data type to process by Branch unit. Type: %d", info.Type))
}
return operation, nil
}
func (this *LoadStore) Process(operation *operation.Operation) (*operation.Operation, error) {
instruction := operation.Instruction()
rdAddress := instruction.Data.(*data.DataI).RegisterD.ToUint32()
rsAddress := instruction.Data.(*data.DataI).RegisterS.ToUint32()
immediate := instruction.Data.(*data.DataI).Immediate.ToUint32()
switch instruction.Info.Opcode {
case set.OP_LW:
rsValue := this.Bus().LoadRegister(operation, rsAddress)
value := this.Bus().LoadData(operation, rsValue+immediate)
this.Bus().StoreRegister(operation, rdAddress, value)
logger.Collect(" => [LS][%03d]: [R%d(%#02X) = MEM(%#02X) = %#08X]", operation.Id(), rdAddress, rdAddress*consts.BYTES_PER_WORD, rsValue+immediate, value)
case set.OP_SW:
rdValue := this.Bus().LoadRegister(operation, rdAddress)
rsValue := this.Bus().LoadRegister(operation, rsAddress)
this.Bus().StoreData(operation, rdValue+immediate, rsValue)
logger.Collect(" => [LS][%03d]: [MEM(%#02X) = %#08X]", operation.Id(), rdValue+immediate, rsValue)
case set.OP_LLI:
this.Bus().StoreRegister(operation, rdAddress, immediate)
logger.Collect(" => [LS][%03d]: [R%d(%#02X) = %#08X]", operation.Id(), rdAddress, rdAddress*consts.BYTES_PER_WORD, immediate)
case set.OP_SLI:
rdValue := this.Bus().LoadRegister(operation, rdAddress)
this.Bus().StoreData(operation, rdValue, immediate)
logger.Collect(" => [LS][%03d]: [MEM(%#02X) = %#08X]", operation.Id(), rdValue, immediate)
case set.OP_LUI:
this.Bus().StoreRegister(operation, rdAddress, immediate<<16)
logger.Collect(" => [LS][%03d]: [R%d(%#02X) = %#08X]", operation.Id(), rdAddress, rdAddress*consts.BYTES_PER_WORD, immediate<<16)
case set.OP_SUI:
rdValue := this.Bus().LoadRegister(operation, rdAddress)
this.Bus().StoreData(operation, rdValue, immediate<<16)
logger.Collect(" => [LS][%03d]: [MEM(%#02X) = %#08X]", operation.Id(), rdValue, immediate<<16)
default:
return operation, errors.New(fmt.Sprintf("Invalid operation to process by Data unit. Opcode: %d", instruction.Info.Opcode))
}
return operation, nil
}
func (this *Dispatcher) renameRegisters(operationId uint32, op *operation.Operation, rat *registeraliastable.RegisterAliasTable) {
if op.Instruction().Info.Type == data.TypeI {
data := op.Instruction().Data.(*data.DataI)
if !op.Instruction().Info.IsBranch() {
opcode := op.Instruction().Info.Opcode
if opcode != set.OP_SW && opcode != set.OP_SLI && opcode != set.OP_SUI {
reg, _ := rat.GetPhysicalRegister(operationId, data.RegisterD.ToUint32())
op.SetRenamedDestRegister(reg)
}
}
op.Instruction().Data = data
} else if op.Instruction().Info.Type == data.TypeR {
data := op.Instruction().Data.(*data.DataR)
reg, _ := rat.GetPhysicalRegister(operationId, data.RegisterD.ToUint32())
op.SetRenamedDestRegister(reg)
}
}