I miss the days of reading AMD64 manuals and directly interacting with my hardware through assembly, and I want to get back to it.
What would be a good entry-point to OS development nowadays? I have the "FYSOS: The System Core" by Benjamin David Lunt. While I love the series, I wonder what other alternatives there are, perhaps supporting ARM?
- It's not only a kernel, but also have user space
- Code is pretty compact and well documented, in general can be understood in a few days
- No need to spend hours to custom build gcc. Just use the one provided by the distro package manager
The x86 version isn't mantained anymore. They switched to RISC-V.
The course has you make useful extensions to a reimplementation of the XV6 kernel in RISC-V.
This course really helped me start to understand how an OS works and what the hardware software interface really is.
[1] https://pdos.csail.mit.edu/6.828/2020/ — linking to the 2020 class because all of the lectures were uploaded to YouTube to accommodate remote work during the thick of Covid.