def get_value(b:bytearray):
  ret=0
  for i,item in enumerate(b):
    ret|=item<<(8*i)
  return ret

def set_value(b:bytearray,value:int):
  for i in range(len(b)):
    b[i]=(value>>(8*i))&0xff


class cpu(object):
  def __init__(self,rom_addr:int,rom_size:int,mem_addr:int,mem_size:int) -> None:
    self.rom_addr=rom_addr
    self.rom=bytearray(rom_size)
    self.mem_addr=mem_addr
    self.mem=bytearray(mem_size)
  def get_value(self,addr:int,size:int):
    if not (size in [1,2,4,8]):
      raise Exception(f"CPU 异常 因为地址未对齐 {size}")
    if(addr>=self.rom_addr) and (addr<self.rom_addr+len(self.rom)):
      return get_value(self.rom[addr-self.rom_addr,addr-self.rom_addr+size])
  def set_value(self,addr:int,size:int,value:int):
    if not (size in [1,2,4,8]):
      raise Exception(f"CPU 异常 因为地址未对齐 {size}")
    if(addr>=self.rom_addr) and (addr<self.rom_addr+len(self.rom)):
      set_value(self.rom[addr-self.rom_addr,addr-self.rom_addr+size],value)