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"int prot" is the device's characteristic. Audio mic devices would use
VM_PROT_READ. Framebuffers would use VM_PROT_WRITE. We need to introduce
BUS_SPACE_PROT_* symbols too.
i don't see why you think that reads from fb devices never occur.
i'm also unsure how audio devices matter for this, but i haven't
looked closely at this part yet... they are usually implemented with
the read/write parts combined, so there is no "mic device" separate
from the "line-out" or "headphones" (but there are ways to choose
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