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cpu.py
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import cpuhelper
import os
import sys
sys.path.append("/".join(os.path.dirname(os.path.realpath(__file__)).split("/")) + "/cputicks/")
import instructions
import mmu
import interupt
import debug
import time
class states():
OPCODE = 1
EXT_OPCODE = 2
OPERAND = 3
RUNNING = 4
IRQ_READ_IF = 5
IRQ_READ_IE = 6
IRQ_PUSH_1 = 7
IRQ_PUSH_2 = 8
IRQ_PUSH_2_AND_JUMP = 9
STOPPED = 10
HALTED = 11
class cpu(object):
def __init__(self, gui, refrence, interruptManager):
self.register = cpuhelper.register()
self.interruptManager = interruptManager
import serial
self.serial = serial.serial()
self.adressSpace = mmu.Mmu(gui, self.interruptManager, refrence, self.serial)
self.state = states.OPCODE
self.debuger = debug.debug(self.register, self.adressSpace)
self.debuger.giveOpcodes(instructions.opcodes + instructions.extOpcodes)
'''
self.register.AF = 0x0100
self.register.BC = 0x0013
self.register.DE = 0x00d8
self.register.HL = 0x014d
self.register.SP = 0xfffe
self.register.PC = 0x0100
self.register.localflags.setZ(True)
self.register.localflags.setH(True)
self.register.localflags.setC(True)
'''
#AF=0100, BC=0013, DE=00d8, HL=014d, SP=fffe, PC=0100, Z-HC----
opcodeArgs = [0x0] * 2
opcode1 = None
opcode2 = None
currentOpcode = None
interruptFlag = 0
interruptEnabled = 0
rounds = 0
opIndex = 0
opContext = 0
operandIndex = 0
roundx = 0
requestedIrq = None
totalrounds = 0
realtalk = 0
orginalpc = 0
def ticktest(self):
def clearstate():
self.opcode1 = 0
self.opcode2 = 0
self.currentOpcode = None
self.opcodeArgs = [0x0] * 2
self.operandIndex = 0
self.opIndex = 0
self.opContext = 0
self.interruptFlag = 0
self.interruptEnabled = 0
self.requestedIrq = None
if(self.state == states.OPCODE or self.state == states.HALTED or self.state == states.STOPPED):
if(self.interruptManager.isInterruptRequested()):
self.state = states.IRQ_READ_IF
if(self.state == states.HALTED):
if(self.interruptManager.isInterruptFlagSet()):
self.state = states.OPCODE
if(self.serial.EnableBlattsDebug):
if(self.register.getBC() == 4608 or
self.register.getBC() == 1200):
self.register.debug = True
if(self.register.debug):
self.debuger.trace(self.currentOpcode)
time.sleep(1)
# self.nommulrodsun += 1
pc = self.register.getPC()
if(self.state == states.OPCODE):
clearstate()
self.opcode1 = self.adressSpace.getByte(pc)
if((self.opcode1) == 0xcb):
self.state = states.EXT_OPCODE
elif((self.opcode1) == 0x10):
self.currentOpcode = instructions.opcodes[self.opcode1]
else:
self.state = states.OPERAND
self.currentOpcode = instructions.opcodes[self.opcode1]
self.orginalpc = pc
if(self.currentOpcode == None):
raise Exception("Bad opcode in currentopcode ")
self.register.incrementPC()
return
elif(self.state == states.EXT_OPCODE):
self.opcode2 = self.adressSpace.getByte(pc)
if(self.currentOpcode == None):
self.currentOpcode = instructions.extOpcodes[self.opcode2]
if(self.currentOpcode == None):
raise Exception("Bad opcode ext")
self.state = states.OPERAND
self.register.incrementPC()
return
elif(self.state == states.OPERAND):
if(self.operandIndex < self.currentOpcode.argstotal()):
self.opcodeArgs[self.operandIndex] = self.adressSpace.getByte(pc)
self.register.incrementPC()
self.operandIndex += 1
return
self.state = states.RUNNING
if(self.state == states.RUNNING):
if(self.opcode1 == 0x10):
self.state = states.STOPPED
return
elif(self.opcode1 == 0x76):
self.state = states.HALTED
return
self.debuger.checkBreakpoint(hex(self.currentOpcode.opcode), self.currentOpcode.label)
while self.opIndex < len(self.currentOpcode.instructions):
currnetOP = self.currentOpcode.instructions[self.opIndex]
self.opContext = currnetOP.execute(self.register, self.adressSpace, self.opcodeArgs, self.opContext)
currnetOP.switchInterrupts(self.interruptManager)
self.opIndex += 1
if not currnetOP.prooced(self.register):
self.opIndex = len(self.currentOpcode.instructions)
break
if(currnetOP.readMemory or currnetOP.writeMemory):
break
if(self.opIndex >= len(self.currentOpcode.instructions)):
self.state = states.OPCODE
self.operandIndex = 0
self.debuger.tick(self.currentOpcode.label)
self.interruptManager.onInstructionFinished()
return
if(self.state == states.IRQ_READ_IF):
self.interruptFlag = self.adressSpace.getByte(0xff0f)
self.state = states.IRQ_READ_IE
return
if( self.state == states.IRQ_READ_IE):
self.interruptEnabled = self.adressSpace.getByte(0xffff)
self.requestedIrq = None
for irq in range(0, len(self.interruptManager.respone.values())):
if ((self.interruptFlag & self.interruptEnabled & (1 << irq)) != 0) :
self.requestedIrq = self.interruptManager.respone.values()[irq]
break
self.interruptManager.flush()
if(self.requestedIrq == None):
self.state = states.OPCODE
else:
self.state = states.IRQ_PUSH_1
self.interruptManager.disableInterrupts(False)
return
if(self.state == states.IRQ_PUSH_1):
self.register.decrementSP()
self.adressSpace.setByte(self.register.getSP(), (self.register.getPC() & 0xff00) >> 8);
self.state = states.IRQ_PUSH_2_AND_JUMP;
return
if(self.state == states.IRQ_PUSH_2_AND_JUMP):
self.register.decrementSP()
self.adressSpace.setByte(self.register.getSP(), self.register.getPC() & 0x00ff);
#raise Exception("BUG")
self.register.setPC(self.requestedIrq);
self.requestedIrq = None
self.state = states.OPCODE
return