# The Little Kernel Embedded Operating System

The LK kernel is an SMP-aware kernel designed for small systems ported to a variety of platforms and cpu architectures.

See https://github.com/littlekernel/lk for the latest version.

### High Level Features

- Fully-reentrant multi-threaded preemptive kernel
- Portable to many 32 and 64 bit architectures
- Support for wide variety of embedded and larger platforms
- Powerful modular build system
- Large number of utility components selectable at build time

### Supported architectures

-   ARM32
-   -  Cortex-M class cores (armv6m - armv8m)
-   -  ARMv7+ Cortex-A class cores
-   ARM64
-   RISC-V 32 and 64bit bit in machine and supervisor mode
-   x86-32 and x86-64 386 up through modern cores
-   microblaze
-   MIPS
-   OpenRISC 1000

### [TODO](docs/todo.md)

### To build and test for ARM on linux

1. install or build qemu. v2.4 and above is recommended.
2. install gcc for embedded arm (see note 1)
3. run scripts/do-qemuarm  (from the lk directory)
4. you should see 'welcome to lk/MP'

This will get you a interactive prompt into LK which is running in qemu
arm machine 'virt' emulation. type 'help' for commands.

Note: for ubuntu x86-64:
sudo apt-get install gcc-arm-none-eabi
or fetch a prebuilt toolchain from
https://newos.org/toolchains/x86_64-elf-10.2.0-Linux-x86_64.tar.xz