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from m5.SimObject import SimObject
from m5.params import *
from m5.proxy import *
from m5.objects.Device import PioDevice
from m5.objects.Platform import Platform

class PciHost(PioDevice):
    type = 'PciHost'
    cxx_class = 'gem5::PciHost'
    cxx_header = "dev/pci/host.hh"
    abstract = True

class GenericPciHost(PciHost):
    type = 'GenericPciHost'
    cxx_class = 'gem5::GenericPciHost'
    cxx_header = "dev/pci/host.hh"

    platform = Param.Platform(Parent.any, "Platform to use for interrupts")

    conf_base = Param.Addr("Config space base address")
    conf_size = Param.Addr("Config space base address")
    conf_device_bits = Param.UInt8(8, "Number of bits used to as an "
                                      "offset a devices address space")

    pci_pio_base = Param.Addr(0, "Base address for PCI IO accesses")
    pci_mem_base = Param.Addr(0, "Base address for PCI memory accesses")
    pci_dma_base = Param.Addr(0, "Base address for DMA memory accesses")

    def pciFdtAddr(self, bus=0, device=0, function=0, register=0, space=0,
                   aliased=0, prefetchable=0, relocatable=0, addr=0):

        busf = bus & 0xff
        devicef = device & 0x1f
        functionf = function & 0x7
        registerf = register & 0xff
        spacef = space & 0x3
        aliasedf = aliased & 0x1
        prefetchablef = prefetchable & 0x1
        relocatablef = relocatable & 0x1

        if  busf != bus or \
            devicef != device or \
            functionf != function or \
            registerf != register or \
            spacef != space or \
            aliasedf != aliased or \
            prefetchablef != prefetchable or \
            relocatablef != relocatable:
            fatal("One of the fields for the PCI address is out of bounds")

        address = registerf | (functionf << 8) | (devicef << 11) | \
                (busf << 16) | (spacef << 24) | (aliasedf << 29) | \
                (prefetchablef << 30) | (relocatablef << 31)

        low_addr = addr & 0xffffffff
        high_addr = (addr >> 32) & 0xffffffff

        return [address, high_addr, low_addr]
