PromptOS (x86_64)

This repository now contains a real bootable prototype OS:

• Boots with Limine on x86_64.
• Runs a tiny single-task kernel.
• Reads a USTAR initramfs module and locates init.elf.
• Parses ELF64 and transfers control to init.elf.
• Exposes syscalls for read, write, memmap, fork, execve, exit, and open with Unix-like fd values (stdin=0, stdout=1).
• Includes headless QEMU automation scripts/tests.

Layout

• crates/common: shared ABI + USTAR/ELF parsers.
• crates/kernel: no_std kernel entry, ELF loading, IDT/syscall setup, serial output, memory manager, and a stack-based process system.
• crates/init: no_std Rust-only user init program with direct syscall wrappers (no libc layer).
• crates/testbin: tiny no_std exec target used by init/shell to validate fork+execve+exit/open behavior (including reading test.txt from initrd).
• crates/shell: tiny no_std shell-like exec target used by non-test init builds, launched as /bin/shell.elf by init.
• scripts/: image build + QEMU run harness.
• tests/: host + headless smoke checks.

Quickstart

cargo test -p common
./scripts/build_image.sh
./scripts/run_qemu_headless.sh
# smoke path uses: INIT_FEATURES=test-build ./scripts/build_image.sh

Note

This was made 100% by AI, if you don't like that, check out Boonix!

License

AGPL-3.0-only.