Mosa.HardwareSystem.PCI.PCIDevice.PCIDevice C# (CSharp) Method

        public PCIDevice(IPCIController pciController, byte bus, byte slot, byte fun)
        {
            base.Parent = pciController as Device;
            base.Name = base.Parent.Name + "/" + bus.ToString() + "." + slot.ToString() + "." + fun.ToString();
            base.DeviceStatus = DeviceStatus.Available;

            this.pciController = pciController;
            Bus = bus;
            Slot = slot;
            Function = fun;

            ioPortRegionCount = memoryRegionCount = 0;
            BaseAddresses = new BaseAddress[8];

            for (byte i = 0; i < 6; i++)
            {
                byte barr = (byte)(PCIConfigurationHeader.BaseAddressRegisterBase + (i * 4));
                uint address = pciController.ReadConfig32(bus, slot, fun, barr);

                if (address == 0)
                    continue;

                HAL.DisableAllInterrupts();

                pciController.WriteConfig32(bus, slot, fun, barr, 0xFFFFFFFF);
                uint mask = pciController.ReadConfig32(bus, slot, fun, barr);
                pciController.WriteConfig32(bus, slot, fun, barr, address);

                HAL.EnableAllInterrupts();

                if (address % 2 == 1)
                    BaseAddresses[i] = new BaseAddress(AddressType.IO, address & 0x0000FFF8, (~(mask & 0xFFF8) + 1) & 0xFFFF, false);
                else
                    BaseAddresses[i] = new BaseAddress(AddressType.Memory, address & 0xFFFFFFF0, ~(mask & 0xFFFFFFF0) + 1, ((address & 0x08) == 1));
            }

            if ((ClassCode == 0x03) && (SubClassCode == 0x00) && (ProgIF == 0x00))
            {
                // Special case for generic VGA
                BaseAddresses[6] = new BaseAddress(AddressType.Memory, 0xA0000, 0x1FFFF, false);
                BaseAddresses[7] = new BaseAddress(AddressType.IO, 0x3B0, 0x0F, false);
            }

            foreach (var baseAddress in BaseAddresses)
            {
                if (baseAddress == null)
                    continue;

                switch (baseAddress.Region)
                {
                    case AddressType.IO: ioPortRegionCount++; break;
                    case AddressType.Memory: memoryRegionCount++; break;
                }
            }
        }