9trash OS

A simple operating system from scratch runs on Raspberry Pi 3 Model B.
Self-learning project based on NYCU OSDI Spring 2022 course.

Document

• Build Environment
• Run qemu with debugger

Schedule

• I started this project in 2022 summer vocation. I plan to finish it in 2023 winter vocation.

• The source code may be found in lab branchs.

  Lab	Main Content	Finish Date	Intro
  0	environment setup	2022/06/30	1. simple linker.ld and start.s 2. Makefile structure
  1	UART & simple shell	2022/07/15	1. hard-polling uart 2. mailbox to get board info
  2	filesystem(CPIO) & Device Tree	2022/08/01	1. initial ramdisk with cpio 2. dtb handler
  3	exception & interrupt	2023/03/20	1. run main program in el0 2. handle exception and interrupt to el1 3. load user program image 4. interrupt-trigger uart driver
  3.5	exception & interrupt	2024/06/13	1. check signal type in irq handler 2. handle svc register problem
  4	memory allocator	2024/06/23	1. page frame allocator with buddy system 2. dynamic memory allocator 3. startup allocator