EchoOS

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

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)

Clone & Run

Clone the repository

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

Building the source and running it

./build.sh && make run

Note

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

1. QEMU emulator
2. GCC Cross-Compiler
3. A tree structure that looks like this (in the root of the project):

.
├── bin
├── build
│   ├── disk
│   ├── idt
│   ├── io
│   └── memory
│       ├── heap
│       └── paging