PCI_MESSAGE_BASE
PCI_BUS_RELATIONS = PCI_MESSAGE_BASE + 0,
PCI_QUERY_BUS_RELATIONS = PCI_MESSAGE_BASE + 1,
PCI_POWER_STATE_CHANGE = PCI_MESSAGE_BASE + 4,
PCI_QUERY_RESOURCE_REQUIREMENTS = PCI_MESSAGE_BASE + 5,
PCI_QUERY_RESOURCE_RESOURCES = PCI_MESSAGE_BASE + 6,
PCI_BUS_D0ENTRY = PCI_MESSAGE_BASE + 7,
PCI_BUS_D0EXIT = PCI_MESSAGE_BASE + 8,
PCI_READ_BLOCK = PCI_MESSAGE_BASE + 9,
PCI_WRITE_BLOCK = PCI_MESSAGE_BASE + 0xA,
PCI_EJECT = PCI_MESSAGE_BASE + 0xB,
PCI_QUERY_STOP = PCI_MESSAGE_BASE + 0xC,
PCI_REENABLE = PCI_MESSAGE_BASE + 0xD,
PCI_QUERY_STOP_FAILED = PCI_MESSAGE_BASE + 0xE,
PCI_EJECTION_COMPLETE = PCI_MESSAGE_BASE + 0xF,
PCI_RESOURCES_ASSIGNED = PCI_MESSAGE_BASE + 0x10,
PCI_RESOURCES_RELEASED = PCI_MESSAGE_BASE + 0x11,
PCI_INVALIDATE_BLOCK = PCI_MESSAGE_BASE + 0x12,
PCI_QUERY_PROTOCOL_VERSION = PCI_MESSAGE_BASE + 0x13,
PCI_CREATE_INTERRUPT_MESSAGE = PCI_MESSAGE_BASE + 0x14,
PCI_DELETE_INTERRUPT_MESSAGE = PCI_MESSAGE_BASE + 0x15,
PCI_RESOURCES_ASSIGNED2 = PCI_MESSAGE_BASE + 0x16,
PCI_CREATE_INTERRUPT_MESSAGE2 = PCI_MESSAGE_BASE + 0x17,
PCI_DELETE_INTERRUPT_MESSAGE2 = PCI_MESSAGE_BASE + 0x18, /* unused */
PCI_BUS_RELATIONS2 = PCI_MESSAGE_BASE + 0x19,
PCI_RESOURCES_ASSIGNED3 = PCI_MESSAGE_BASE + 0x1A,
PCI_CREATE_INTERRUPT_MESSAGE3 = PCI_MESSAGE_BASE + 0x1B,