Josep Comes

In the previous posts, we successfully set up our development environment, wrote a minimal kernel to handle booting, and initialized the UART to get a “Hello, world!” message printing to a serial console. This was a critical milestone, proving that our code can boot and run correctly within the QEMU emulator on the virt AArch64 […]

In my last post, I laid the groundwork for interrupt handling in my AArch64 OS in Rust. Now, it’s time to put that foundation to good use and switch our UART from a polling-based approach to an interrupt-driven one. In this post, I’ll go over how I made that change and what it means for […]

In the last post, we built the foundation for exception handling on AArch64 by focusing on synchronous exceptions like svc calls. This was an essential first step, but synchronous exceptions are only part of the picture. To fully embrace event-driven design — and move beyond polling — we now need to handle asynchronous exceptions, namely […]

In the previous post, we got our UART up and running using simple polling to send and receive data. While polling is straightforward, it’s also inefficient — the CPU must constantly check for new input, wasting cycles that could be used more effectively elsewhere. Now it’s time to take the next step: setting up a […]

In the last post, we successfully bootstrapped the very first steps of our AArch64 operating system. We wrote a minimal boot.s assembly file to set up the stack and called into Rust code, where we printed a simple “Hello, World!” message to the screen using the semihosting feature of QEMU.This gave us a first taste […]

Introduction I’ve been passionate about low-level systems and cybersecurity for years. Recently, I’ve felt the urge to go deeper — to build something from scratch. Inspired by the QEMU AArch64 Bare Bones guide, I decided to take on a new challenge: writing an operating system targeting the AArch64 architecture. But there’s a twist — instead […]