cc618 / os2020

32 bits OS with custom bootloader, a libc and a FAT32 driver

Os 2020

Os 2020 is a 32 bits OS.

Written in C and assembly (NASM), it provides a custom bootloader, a libc and a Fat32 file system.

Some screenshots

Features

This OS aims to improve an older OS I made named 'OctOs'.

Here is the list of improvements :

• Boot system : A second stage bootloader is implemented so there are 2 bootloaders, the OS is dynamically loaded. It will detects the end of the chunks at run time
• Libraries : OctOs was written in C++ and had a custom standard library. Os 2020 will have a libc (not fully implemented, see this file for details) and also a libk, the libc gathers main IO / string functions and libk handles system related functions such as syscalls and utils such as data structures or path functions
• syscalls : The main goal is not to make a user mode but to provide syscalls for apps
• File IO : This OS provides a Fat32 driver with scripts to retrieve or replace the file system of the Os (see this file for details)
• Apps : Os 2020 contains several processes (called apps) inspired from linux like ls, cat, echo and also a shell with input redirection, go here to see shell functions
• Memory : OctOs suffered from memory leaks because of C++ constructors / destructors. Os 2020 won't use constructors and uses C.

Architecture

• doc : Documentation
• src/stage1 : First bootloader chunk (full Asm)
• src/stage2 : Second bootloader chunk
• src/kernel : Core chunk
• src/lib : Libc and libk

Depedencies

• gcc cross compiler (for i386)
• nasm
• mtools (add /sbin to your path, for fs)
• qemu-system-i386 (optional, to test)
• objcopy (optional, to debug)
• gdb (optional, to debug)
• xterm (optional, to debug)