mee42/carsian

A simple 32 bit OS

Carsian

Carsian is a 32-bit MBR OS that is written in assembly(16-bit elevated to 32 bit gdt) and 32-bit C. Output it through a 80x25 VGA memory buffer, and line-wrapping is handled with a custom implementation. Now, actually making it functional is a whole different challange.,

How it's structured

Assembly files are kept in src/. boot.asm is the first thing ran on startup. kernal_entry.asm is appended to the boot sector and is ran in 32 bit mode to launch the C file. These files are compiled together and added to the boot sector at KERNAL_OFFSET, which is currently at 0x1000.

Files that meantion pm, or protected mode, are used for elevation from 16-bits to 32-bits

Kernal files are in kernal/ and driver files are in driver/, both of which are written in C. C is entered with the main method in kernal.c. There are currently no drivers written.

How to build

This needs to be compiled on the base system, so no binaries will be distributed.

This project can be build using make.

To build bin file

$ make

collect your bin file from out/os.bin

To run in qemu

$ make run

all dependencies must be installed

Dependencies

• ld
• gcc
• nasm
• qemu-system-x86_64

Road Map

• Get this thing running outside of an emulator
• Decide if I want to try to get 64-bit C running
• Get input and output fleshed out
• Be able to read from the hard drive
• Spread propaganda