Not a big fan of git. May create a nicer repo in the future.

Related tags

Miscellaneous os
Overview

os

My x86-64 hobby operating system. Cooperative multitasking system with no user-mode support, everything runs on ring 0 (for now). Packed with a really simple libc (not compliant with standards at all), uses my own filesystem design, and has very basic support for programs.

There's nothing more to explain that the source code does a thousand times better. It's a fairly simple read.

Bootloader

All the bootloader does is:

  • use BIOS Extensions to load itself at 0x7E00 (as 0x7C00-0x7CFF is already loaded by the bios)
  • get memory information and store it at 0x7000
  • enter long mode
  • map the complete physical memory to 0xFFFFFFC000000000
  • load the file '/boot/kernel.elf' and map it to 0xFFFFFF8000000000
  • creates a bitmap that contains information about which memory frames (units of 4096 KB of physical RAM) are being used at 0x100000
  • jumps to the kernel's entry point

Developer notes

Lower Memory Map

This is the state of the physical memory under 0x100000.

Start End Size Description
0x00000 0x00FFF 4 KB Reserved
0x01000 0x02FFF 8 KB Pages
0x03000 0x04FFF 8 KB TSS Stack
0x05000 0x06FFF 8 KB Kernel Stack
0x07000 0x07BFF 3 KB Boot info
0x07C00 0x7FFFF 481 KB Boot code
0x80000 0xFFFFF 512 KB Reserved
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Comments
  • Add a license

    Add a license

    Hello! Just discovered this project and thought it would be a great reference for my own projects! One problem: I can't legally base anything on the code I find here; since you don't have a license, I have no rights.

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    In any case, this looks like a great project; I can't wait to see where it goes next!

    opened by rdrpenguin04 2
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