Suppose your device driver must be written from scratch, and you do not have the actual hardware while developing this device driver.
假设我们必须从头开始编写这个设备驱动程序，在开发这个设备驱动程序时还没有实际的硬件。
When the guest operating system's driver peeks and pokes at the memory and hardware registers, software exists underneath to emulate the device (see Figure 2).
在来宾操作系统的驱动程序窥探内存和硬件寄存器时，软件存在于下面来仿真设备（参见图 2）。
This paper introduces the realization of the image sampling system in hardware, firmware, device driver and application software.
阐述了系统的硬件、固件、设备驱动程序和应用软件的设计与实现方法。
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