https://github.com/acasamit/ratios

RatiOS is a simple operating system kernel developed from scratch in C and Assembly for BIOS (not EFI) on the i386 architecture.
https://github.com/acasamit/ratios

assembly c kernel

Last synced: 17 days ago
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RatiOS is a simple operating system kernel developed from scratch in C and Assembly for BIOS (not EFI) on the i386 architecture.

• Host: GitHub
• URL: https://github.com/acasamit/ratios
• Owner: acasamit
• Created: 2024-10-16T14:36:48.000Z (30 days ago)
• Default Branch: main
• Last Pushed: 2024-10-28T02:27:53.000Z (18 days ago)
• Last Synced: 2024-10-28T06:11:40.453Z (18 days ago)
• Topics: assembly, c, kernel
• Language: C
• Homepage:
• Size: 6.06 MB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# RatiOS (simple i386 kernel from scratch)

![RatiOS](https://i.imgur.com/mO8gPhw.png)

RatiOS is a simple operating system kernel developed from srcatch in **C** and **Assembly** for **BIOS** (not EFI) on the **i386 architecture**. It includes core components like a Global Descriptor Table (GDT) and an Interrupt Descriptor Table (IDT), providing a basic foundation for memory segmentation and interrupt handling. 

- **GDT (Global Descriptor Table)**: The GDT manages memory segmentation in protected mode, defining memory segments for code and data.

- **IDT (Interrupt Descriptor Table)**: The IDT handles interrupt vectors, allowing RatiOS to respond to hardware and software interrupts.

## Features

### Basic Shell

RatiOS includes a basic shell with the following commands:

- **`test`**: Runs a test function to print the memory addresses of two hardcoded stack variables.

- **`lock`**: Locks the session; password to unlock is `ratio`.

- **`echo`**: Prints text to the screen.

- **`clear`**: Clears the screen.

- **`exit`**: Turns off the machine.

- **`shutdown`**: Turns off the machine.

- **`halt`**: Halts all system processes.

- **`reboot`**: Restarts the machine.

### Keyboard Shortcuts

- **Ctrl + S (Switch)**: Switches between two available workspaces.

- **Ctrl + C (Color)**: Changes the text color.

- **Ctrl + L (Lock)**: Locks the session.