class Processor:
def __init__(self,
initialPC=Bus(64),
IMem=Memory(True),
DMem=Memory(False)):
self.ALU = ALU()
self.IMem = IMem
self.DMem = DMem
self.signExtender = SignExtender()
self.regFile = RegisterFile()
self.Control = Control()
self.nextPCLogic = NextPCLogic()
self.PC = initialPC
self.aluZero = 0
def runCycle(self):
#fetch the instruction from IMem
instruction = self.IMem.performOp(self.PC, None, 1, 0)
#get control signals
self.Control.performOp(instruction.slice(31, 21))
#reg file
Source1Loc = instruction.slice(9, 5)
Source2UpperBound = [20]
Source2LowerBound = [16]
if (self.Control.reg2loc):
Source2UpperBound = [4]
Source2LowerBound = [0]
Source2Loc = instruction.slice(Source2UpperBound[0],
Source2LowerBound[0])
Source1, Source2 = self.regFile.performOp(0, Source1Loc, Source2Loc,
None, None)
#sign extension
Imm26 = instruction.slice(25, 0)
extendedImmediate = self.signExtender.performOp(
self.Control.signop, Imm26)
#ALU
writeData = deepcopy(Source2)
if (self.Control.alusrc):
Source2 = extendedImmediate
ALUOutput, self.aluZero = self.ALU.performOp(self.Control.aluop,
Source1, Source2)
#DMem
DMemOutput = self.DMem.performOp(ALUOutput, writeData,
self.Control.memread,
self.Control.memwrite)
#Write back to reg file
writeReg = instruction.slice(4, 0)
writeData = ALUOutput
if (self.Control.mem2reg):
writeData = DMemOutput
self.regFile.performOp(self.Control.regwrite, Bus(5), Bus(5), writeReg,
writeData)
#NextPC
self.PC = self.nextPCLogic.performOp(self.Control.uncondbranch,
self.Control.branch, self.aluZero,
extendedImmediate, self.PC)
return (self.PC, DMemOutput)
