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Provide a way for the userland application to subscribe for notifications about card-generated interrupts. This is necessary for prototyping the device drivers in userspace.
Note: current pass(4) implementation already has something similar with CAMIOQUEUE / CAMIOGET ioctls, although they still assume that there is a request that should be queued from the userland in the kernel. Userland uses select / kqueue on /dev/passN FD for subscribing to request completion notification. Card-generated interrupts can use the same notification mechanism.
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