There are three files in the ZIP for PilOS with x86_64 assembly, totaling about 2000 lines, dedicated to the boot and lower-level details, as usual.
From a quick look I think that two of the files (the big ones) are mutually exclusive, so it may really be closer to about 1000 lines of x86_64 assembly to get it minimally working.
From a quick look I think that two of the files (the big ones) are mutually exclusive, so it may really be closer to about 1000 lines of x86_64 assembly to get it minimally working.