Osdev Notes

This repository is a collection of small documents, notes and articles about various osdev topics.

They are not meant to be exhaustive, just personal notes. I will keep updating them while developing the OS.

They are divided by topic, and usually in addition to information widely available on internet. I also try to add information based on personal experience, advice received, or mistakes made.

I hope that someone will find them useful.

Topics covered so far:

• Building & Boot Protocols

  • Bootloaders and Boot Protocols
  • Building a Kernel
  • Linker Scripts
  • Makefiles
  • Generating a Bootable Iso

• Memory Management

  • Physical Memory
  • Paging
  • Virtual Memory Manager
  • Heap Allocation
  • Memory Protection

• Keyboard

  • Interrupt Handling
  • Driver Implementation

• Scheduling

  • The Scheduler
  • Processes and Threads
  • Locks

• Getting to Userspace

  • Switching Modes
  • Updated Interrupt Handling
  • System Calls
  • Example Syscall ABI

• Extras

  • General Troubleshooting
  • Tips and Tricks
  • C Language
  • Working With NASM

• APIC

• Debugging

• Drawing text on framebuffer

• Framebuffer

• Global Descriptor Table

• Moving the kernel in the higher half

• Interrupt handling (64 bit)

• RSDP_and_RSDT

• Timer

Useful links

• DreamOs64 64 bit Os written from scratch by Dreamos82.
• Northport Another 64 bit Os written from scratch with SMP! by DeanoBurrito.
• DreamOs 32 Bits Os written from scratch, the project is discontinued but I think it was worth mentioning. By Dreamos82.

Authors

• Ivan G - Main author and creator of these notes.
• Dean T - Co-Author.