from m5 import *from FunctionalMemory import FunctionalMemory# This device exists only because there are some devices that I don't# want to have a Platform parameter because it would cause a cycle in# the C++ that cannot be easily solved.## The real solution to this problem is to pass the ParamXXX structure# to the constructor, but with the express condition that SimObject# parameter values are not to be available at construction time.  If# some further configuration must be done, it must be done during the# initialization phase at which point all SimObject pointers will be# valid.class FooPioDevice(FunctionalMemory):    type = 'PioDevice'    abstract = True    addr = Param.Addr("Device Address")    mmu = Param.MemoryController(Parent.any, "Memory Controller")    io_bus = Param.Bus(NULL, "The IO Bus to attach to")    pio_latency = Param.Tick(1, "Programmed IO latency in bus cycles")class FooDmaDevice(FooPioDevice):    type = 'DmaDevice'    abstract = Trueclass PioDevice(FooPioDevice):    type = 'PioDevice'    abstract = True    platform = Param.Platform(Parent.any, "Platform")class DmaDevice(PioDevice):    type = 'DmaDevice'    abstract = True