Implementing a PS/2 Mouse Driver in my Custom OS (PoragOS)

dev.to GitHub2026-11-11 00:360 views

I am building a 32-bit x86 Operating System from scratch as a 7th-grade student. Today, I successfully implemented a PS/2 mouse driver!

What I did:

Enabled the auxiliary PS/2 port.

Handled IRQ12 interrupts.

Decoded the 3-byte movement packets (handling X/Y sign extension).

Wrote a custom rendering function to draw a cursor directly to the VESA Framebuffer.

Here is the screenshot of the cursor working in QEMU.

Next, I am going to fix the cursor trails using a backbuffer and move on to implementing User Space (Ring 3) and Syscalls.

Check out the code on GitHub:
https://github.com/porag2025-glitch/PoragOS. #osdev #c #programming #showdev

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