The kernel resides in the higher half, and as of now still identity maps the lower half for compatibility. Will not merge back to master until all the previous features work properly in virtual memory..
Instead of passing function pointers, we're passing structs with context
now. The idea is the same, I/O functions require some struct with a
function pointer and some generic memory that only the output device
cares about. I/O just calls it.
VGA has been reworked to accomodate this change, as well as default
outputs being created for low-overhead use (such as interrupt handlers).
