根据设备驱动程序的不同，如果设备具有缓冲区，可能需要使用一个缓冲区的拷贝。

Depending on your device driver, you may need to have a copy of the buffers, if the device has any.

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例如，对底层设备驱动程序的读写请求会通过缓冲区缓存来传递。

For example, read and write requests to the underlying device drivers migrate through the buffer cache.

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帧缓冲区驱动程序通常有三层。

The framebuffer driver normally has three layers.

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