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About

TOS is a hobby operating system written in C and assembly (GAS).

If you're looking for the code I've written, most of it is in kernel/arch/i386 and kernel/kernel

The currently implemented features are

  • Bringing up the CPU (GDT, IDT)
  • Setting up the rest of x86 (PIC, PIT)
  • Interrupts
  • Basic Keyboard support
  • (very) Basic kernel mode shell

The next features up are

  • Physical memory manger
  • Virtual memory manager
  • Fancy visual stuff when I get bored

Building

A GCC cross compiler for i686-elf is required, as well as QEMU or some other way of running an i686 binary.
Building can be done with ./build and simuation with ./qemu (if using QEMU).

The complete process can be found in the resources section.

For Manjaro

If you happen to be building on Manjaro (as I am) this is exactly what you need to do:

  • get the newest binutils from here: ftp://ftp.gnu.org/gnu/binutils/
  • get the newest gcc from here: ftp://ftp.gnu.org/gnu/gcc/
  • exstract them both into HOME/src
  • Follow these instruction starting at "The Build" : http://wiki.osdev.org/GCC_Cross-Compiler
  • install: qemu, xorriso, mtools

Resources

These are the resources I used for learning and examples

  • OSDev.org wiki, specifically the Meaty Skeleton tutorial was used as the bases for the build system, file layout and very basic libc requirments
  • The OS Development Series from brokenthorn.com for most of the knowledge, especially on the CPU bring up
  • Bran's Kernel Development Tutorial from www.osdever.net for the interrupt set up and some very repetitive assembly