https://github.com/omarazizi/echoos

Operating System and Kernel
https://github.com/omarazizi/echoos

32-bit c kernel kernel-development low-level-programming operating-system x86-assembly

Last synced: 4 months ago
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Operating System and Kernel

• Host: GitHub
• URL: https://github.com/omarazizi/echoos
• Owner: OmarAzizi
• Created: 2024-02-23T21:31:55.000Z (over 1 year ago)
• Default Branch: main
• Last Pushed: 2024-03-24T12:53:43.000Z (about 1 year ago)
• Last Synced: 2024-12-03T22:09:21.690Z (6 months ago)
• Topics: 32-bit, c, kernel, kernel-development, low-level-programming, operating-system, x86-assembly
• Language: C
• Homepage:
• Size: 48.8 KB
• Stars: 4
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# EchoOS

![C](https://img.shields.io/badge/c-%2300599C.svg?style=for-the-badge&logo=c&logoColor=white)

![Assembly Icon](https://img.shields.io/badge/x86-Assembly-green?style=for-the-badge&logo=assembly)

I'm trying to build my own Operating System and its kernel (Project still in progress). So far I implemented:

- The bootloader

- Global Descriptor Table (GDT), so I can switch to 32-bit Protected mode

- Simple LBA driver to read from disk in protected mode (Because we can't use __INT 0x13__ from BIOS anymore)

- VGA 16-color text mode 

- Interrupt Descriptor Table (IDT)

- Simple memset function

- Remapped Master & Slave PICs

- Dynamic memory (.e.g heap memory & malloc like functions)

- Memory paging

## Testing Interrupts

This screenshot shows the output in qemu after I devided by zero in to trigger the interrupt 0 in IDT

![image](https://github.com/OmarAzizi/EchoOS/assets/110500643/bea5a44c-fa8d-4538-b1b9-4dd36e24034c)

This screenshot shows the output after pressing a key on the keyboard (This is after remapping the PICs so the interrupt called here is 0x21)

![image](https://github.com/OmarAzizi/EchoOS/assets/110500643/3a9eef5d-fb3b-4b94-80e2-99bf8f2ffa7c)

## Clone & Run

Clone the repository

```bash

git clone https://github.com/OmarAzizi/EchoOS.git && cd EchoOS

```

Building the source and running it

```bash

./build.sh && make run

```

### Note

To build the code successfully, you need to set up:

1. [QEMU emulator](https://www.qemu.org/)

2. [GCC Cross-Compiler](https://wiki.osdev.org/GCC_Cross-Compiler)

3. A tree structure that looks like this (in the root of the project):

```bash

.

├── bin

├── build

│   ├── disk

│   ├── idt

│   ├── io

│   └── memory

│       ├── heap

│       └── paging

```