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memory mapped IO: device registers mapped to virtual memory or physical memory?
Hi -
I know memory mapped IO is about mapping device/controller registers to memory space in order to reduce the number of processor instructions (and simplify device driver writing) . My question is: are device registers mapped to virtual memory or physical memory? I suspect the former, and I have looked up a number of texts but everyone just seems to skirt about the issue. Thanks, - Olumide |
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