Litchi

Notes

Please check litchi-rs, the continuation of this project in ~100% Rust!

Litchi

Bugen's toy kernel for x86 systems implemented in modern C++.

Get Started

Install Toolchains

Litchi is compiled to i386-elf target, which may require a cross-compiler. For macOS user, some Homebrew formulae and bottles are provided (see BugenZhao/homebrew-litchi).

Make sure you have Homebrew installed, then simply run:

$ brew tap bugenzhao/litchi
$ brew install i386-litchi-elf-binutils 
               i386-litchi-elf-gcc      
               i386-litchi-elf-gdb      
               litchi-qemu

Build & Run

Litchi is built by CMake, which is fairly easy to build and run:

$ git clone https://github.com/BugenZhao/Litchi.git && cd Litchi
$ mkdir build && cd build && cmake .. && make qemu

Progress

• Adopt bootloader from JOS / xv6
• Bootloader support for floppy drive
• Port old Litchi codes
• CMake build support
• Kernel level standard output
• Color output in console
• Serial port color output
• Serial port input
• Kernel panic and warning
• Programmed keyboard input support
• Kernel level standard input
• Input with format
  • stringToLong
  • scanFmt
• Basic debugging information
• Basic kernel commands
  • help
  • echo
  • vm-*
    • map
    • dump
  • ...
• Physical memory detection
• Physical memory management
• Virtual memory
• Kernel address space
• Kernel heap management
• User level task
• Interrupt / Rrap
• System call

---

• Test for standard library
• Interrupt based keyboard input
• Shell
• Multitasking
• Multi-core support
• Port to x86-64
• ...

Reference

1. JOS / xv6
2. Stack Overflow
3. Hurlex
4. Orange'S: 一个操作系统的实现
5. OSDev.org