pi-learn-os

A toy Raspberry Pi 3B kernel for learning.

I wanted to learn the basics of operating system development on something besides x86.

Implemented

• UART
• Exception level switching
• Basic interrupt handling
• Generic timer
• MMU and paging

Unimplemented

• Mailboxes
• FAT16 filesystem and disk driver
• processes and process scheduling
• system calls
• ELF and user space programs
• much more...

Development

# setup cross compiler
make toolchain

# build
make build

# emulate via Qemu
make run

References

• https://wiki.osdev.org/ARM_Overview
• https://wiki.osdev.org/Raspberry_Pi_Bare_Bones
• https://en.wikipedia.org/wiki/Calling_convention#ARM_(A64)
• Building an Operating System for the Raspberry Pi
• Arm Cortex-A53 MPCore Processor Technical Reference Manual
• ARM Cortex-A Series Programmers Guide for ARMv8-A Instruction Set
• BCM2837 ARM Peripherals