Re: https://firmwaresecurity.com/2018/12/30/nasm-uefi-uefi-sample-application-built-in-nasm/
Here’s another Github project based on the same HackerPulp.com article:
https://github.com/Bowlslaw/uefi-kernel
https://hackerpulp.com/os/os-development-windows-1-building-uefi-applications-nasm/