Linux设备驱动程序DF

设备驱动程序接触到的仍是虚拟地址，但关于外界设备有固定的设备地址映射（设备的地址在移植Linux时候判定）

(The device driver is still exposed to virtual addresses, but there is a fixed device address mapping for external devices (the address of the device is determined when transplanting Linux))

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