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Summary: Currently, the RPC interface uses a basic opcode to communicate with the server. This currently is 16 bits. There's no reason for this to be 16 bits, because on the GPU a 32-bit write is the same as a 16-bit write performance wise. Additionally, I am now making all the `libc` based opcodes qualified with the 'c' type, mimiciing how Linux handles `ioctls` all coming from the same driver. This will make it easier to extend the interface when it's exported directly.