显存地址映射。只要知道该类PCI设备的Vendor号，Device号和索引号myIndex，就可以查找到该类PCI设备的MEMORY地址和IO地址，以及中断级。并将第一个MEMORY地址给出它的从物理地址到虚拟地址的映射。-memory address mapping. If that such equipment Vendor PCI, Device and No. myIndex Index, it can find to such equipment PCI Memory addresse