Art by miwashiiba

flower-rs

a monolithic x86_64 kernel written in rust, a continuation of riria.

what this is

a thought experiment, just wanted to see if its possible to make a kernel in rust and also to learn rust.

what this is not

• a good kernel, please don't use this as a reference for writing your own kernel.
• a kernel that will ever be used in production, this is just a toy project.

building

you will need:

- git
- make
- qemu-system-*
- rust
- xorriso

to build the kernel:

make

to run it:

make run

if something breaks down for no reason then it's better to do:

make clean run

things that work

kernel

• gdt/idr/irq/isr
  • GDT INIT .... OK! /j
  • these came free with the x86_64 crates, atp this is just like building a software lol.
• pmm/vmm/paging/heap
  • works i guess, heap is static though.
• vfs
  • devfs (/dev/), tarfs (/init/)
  • basic operations like open/read/write/close work, but that's it for now.
• apic/lapic
  • i have timer working, but that's about it.
• pci
  • super basic ac97 driver, it works and is exposed thru /dev/audio.
• scheduling
  • it works.
• syscalls
  • exit, open, close, read, write, mmap, write_fs_base.
  • will add more when i start porting userland programs.

userspace

• elf
  • it runs, no dynamic linking.
  • supports fork and execve
• programs:
  • cat, echo, hello, pcm, shell

things that don't work

kernel

• vfs
  • ext2 would be nice to have
  • fat would be nice to have
  • pipe would be nice to have
• smp
  • only single core is supported
• stability
  • sometime it got stuck on boot, so not that stable.

userspace

• process
  • signals, etc.
• dynamic linking

and thousands other stuff that i don't remember or know yet.

license

ISC License, see [LICENSE] for more details.