Projects overview

There are 6 course projects designed around the Earth and Grass Operating System.

The projects start with basic concepts like memory and unprivileged ISA. And then introduce new OS and architecture concepts step-by-step.

Projects	OS concepts	Architecture concepts
P0: Queue	pointer in C	memory address
P1: User-level Threading	thread, context switch, synchronization	unprivileged ISA, stack pointer, instruction pointer
P2: Multi-level Feedback Queue	preemptive scheduling	timer interrupt
P3: Memory Exception, Protection and Translation	exception, system call, page table translation	control and status registers, privilege levels and ISA
P4: SD Card Driver (optional)	I/O device driver	serial bus, memory-mapped bus controller
P5: A FAT-style File System	inode, file system layers	N/A