ix

TO BE a minimal unix-like OS.

Goals

• Implement an entire working (x86) OS in less lines than systemd. Wait. That's not a challenge at all.
• Implement an entire working (x86) OS in less lines than 10% the sloc of systemd. There we go.
  • Current goal for total sloc is 10k (including stdutils)
• Simpler is always better.

Ideas

• Microkernel, cause it seems better?
• Separation of cruft ('cause the world is full of it). If compatablity garbage needs to run, keep it away from everything else.

What's implemented

• GDT
• Interrupt Handling
  • Timer (PIC)
  • Keyboard
• Paging

Also, there's an embedded Lisp for use later. Mostly because I can.

Getting Started

• install
  • bochs
  • gcc
  • nasm
  • genisoimage
• run make
• run make run
• type c to continue

Code Breakdown

.
├── gdt.c       - GDT: tells where memroy segments are
├── idt.c       - IDT: tells where ISRs are at
├── irq.c       - IRQ: interrupt requests
├── isrs.c      - ISR: catch interrupts
├── kb.c        - Keyboard: handle keyboard interrupts
├── kmain.c     - Main file
├── loader.s    - Main ASM file
├── mem.c       - Paging
├── multiboot.h - GRUB multboot headers (will be used later for finding end of physical memory)
├── scrn.c      - Screen functions: drawing, clearing, etc.
├── sl3.c       - Lisp: will be embedded in something later on ;)
├── system.h    - Main header file, maps out kernel functions
├── timer.c     - PIC timer
└── types.h     - type aliases, etc.