GluOS

This is a minimal, modular and lightweight kernel in rust

Features

• Full rust (with bootloader in assembly+rust, go check https://github.com/rust-osdev/bootloader), with at least unsafe blocks as possible
• Keyboard input (no usb support, ps emulation)
• CPU exceptions and interrupts
• Paging, heap allocation and multitasking
• ATA reading
• Fat32, ext2, NTFS (only read)
• Can draw some graphics, but no gui present
• Timer delay (no interrupts for now)

Working on features

• NVMe (see src/drivers/disk/nvme.rs)
• Ethernet (see src/drivers/network/e1000.rs)
• ELF loading (see src/drivers/elf.rs & the associated command in src/user/shell.rs -> Execute)

Dev requirements

• Linux system (wsl2 works)
• Nightly rust (should be by default, if not : rustup override set nightly)
• qemu (arch: qemu (qemu-full for gui app), debian: qemu-system-x86 (apt))
• rust-src toolchain on nightly rust (rustup component add rust-src --toolchain nightly-x86_64-unknown-linux-gnu)
• llvm tools (rustup component add llvm-tools-preview)
• bootimage (cargo install bootimage)
• LLD
• run and code ^^ (cargo run)
• Btw cargo build doesn't work but it's normal !

Caution with WSL !

If you have your compile on wsl but the code is on your local drive (so wsl path is: /mnt/c/.../GluOS) the compile times will be horrible (30s instead of ~2s) Move it into /home/[user] instead

Additional work

• Our own bootloader (maybe)
• Full Graphical interface
• Network, NTP & all
• More drivers:
• NVMe
• Ethernet
• USB
• Optimising & refactoring

Ressources

• An amazing blog to start out: https://os.phil-opp.com
• Posts on actuality in os dev: https://rust-osdev.com and their github https://github.com/rust-osdev/about
• The main wiki of os deving: https://wiki.osdev.org (has been my goto for nearly everything)

Some other os's in Rust

• https://github.com/nuta/kerla/tree/main/kernel
• https://github.com/llenotre/maestro
• https://github.com/intermezzOS/kernel
• https://github.com/hermit-os/hermit-rs
• And for more:
• https://wiki.osdev.org/Rust
• https://github.com/flosse/rust-os-comparison

Stuff to check

• cargo audit
• cargo tree --duplicate
• Kernel size, compile times, and speed (the most significant way of seeing speed is the time it takes to init descriptor tables for now)
• Speed: https://corrode.dev/blog/tips-for-faster-rust-compile-times/
• Size: https://github.com/johnthagen/min-sized-rust
• Fast: