pico-os

A minimal operating system for RISC-V 32-bit, written in Zig.

Demo

https://youtu.be/9htanzAm9qw

What is this?

pico-os is a small educational OS inspired by "Operating System in 1,000 Lines". It demonstrates the basics of OS development: booting, memory management, process scheduling, and user-mode syscalls.

Features

• Boots under QEMU (riscv32)
• SV32 paging with a basic memory allocator
• Round-robin cooperative process scheduling
• User mode with trap handling
• Syscalls: write, read, yield, exit

Requirements

• Zig 0.15.2+
• QEMU with riscv32 support
• LLVM tools (objcopy, objdump, nm)

Quick Start

git clone https://github.com/botirk38/pico-os.git
cd pico-os

zig build
zig build run

Other useful commands

zig fmt --check src/   # Check formatting
zig build              # Build kernel and user binaries
zig build run          # Run in QEMU

License

MIT