# Copyright (c) 2008 The Regents of The University of Michigan
# All rights reserved.
#
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# modification, are permitted provided that the following conditions are
# met: redistributions of source code must retain the above copyright
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# redistributions in binary form must reproduce the above copyright
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# neither the name of the copyright holders nor the names of its
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# this software without specific prior written permission.
#
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from m5.params import *
from m5.proxy import *

from m5.objects.Device import IsaFake, BadAddr
from m5.objects.Platform import Platform
from m5.objects.SouthBridge import SouthBridge
from m5.objects.Terminal import Terminal
from m5.objects.Uart import Uart8250
from m5.objects.PciHost import GenericPciHost
from m5.objects.XBar import IOXBar

def x86IOAddress(port):
    IO_address_space_base = 0x8000000000000000
    return IO_address_space_base + port;

class PcPciHost(GenericPciHost):
    conf_base = 0xC000000000000000
    conf_size = "16MiB"

    pci_pio_base = 0x8000000000000000

class Pc(Platform):
    type = 'Pc'
    cxx_header = "dev/x86/pc.hh"
    cxx_class = 'gem5::Pc'
    system = Param.System(Parent.any, "system")

    south_bridge = Param.SouthBridge(SouthBridge(), "Southbridge")
    pci_host = PcPciHost()

    # Serial port and terminal
    com_1 = Uart8250()
    com_1.pio_addr = x86IOAddress(0x3f8)
    com_1.device = Terminal()

    # Devices to catch access to non-existant serial ports.
    fake_com_2 = IsaFake(pio_addr=x86IOAddress(0x2f8), pio_size=8)
    fake_com_3 = IsaFake(pio_addr=x86IOAddress(0x3e8), pio_size=8)
    fake_com_4 = IsaFake(pio_addr=x86IOAddress(0x2e8), pio_size=8)

    # A device to catch accesses to the non-existant floppy controller.
    fake_floppy = IsaFake(pio_addr=x86IOAddress(0x3f2), pio_size=2)

    # A bus for accesses not claimed by a specific device.
    default_bus = IOXBar()

    # A device to handle accesses to unclaimed IO ports.
    empty_isa = IsaFake(pio_addr=x86IOAddress(0), pio_size='64KiB',
                        ret_data8=0, ret_data16=0, ret_data32=0, ret_data64=0,
                        pio=default_bus.mem_side_ports)

    # A device to handle any other type of unclaimed access.
    bad_addr = BadAddr(pio=default_bus.default)

    def attachIO(self, bus, dma_ports = []):
        self.south_bridge.attachIO(bus, dma_ports)
        self.com_1.pio = bus.mem_side_ports
        self.fake_com_2.pio = bus.mem_side_ports
        self.fake_com_3.pio = bus.mem_side_ports
        self.fake_com_4.pio = bus.mem_side_ports
        self.fake_floppy.pio = bus.mem_side_ports
        self.pci_host.pio = bus.mem_side_ports

        self.default_bus.cpu_side_ports = bus.default
