Tree-structure device driver program developing methods and the relationship among device,device class and device driver are analyzed. The framework of PCI bus device driver for FreeBSD is explained in detail.

• 分析了FreeBSD下树状的设备驱动程序开发方法以及设备、设备类和设备驱动的关系,并对FreeBSD下PCI总线类设备驱动的框架结构进行了详细阐述。