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//0x4 bytes (sizeof)
enum _IRQ_DEVICE_POLICY
{
    IrqPolicyMachineDefault = 0,
    IrqPolicyAllCloseProcessors = 1,
    IrqPolicyOneCloseProcessor = 2,
    IrqPolicyAllProcessorsInMachine = 3,
    IrqPolicySpecifiedProcessors = 4,
    IrqPolicySpreadMessagesAcrossAllProcessors = 5
};