building an OS (all streams)

Currently Playing: building my own operating system in c++ (week 90, kernel unit tests)

(detailed timestamps in comments) #livecoding #operatingsystem #coding welcome: https://offlinemark.com/welcome discord: https://discord.gg/XsgpqpVxNu Welcome! I’m an aspiring systems programmer. Professionally, I used to work in infosec, but now I work on music production software & hardware. I stream OS/kernel development every week for 2 hours. (I’ve done this for over 75 weeks in a row! Sundays 10a-12 ET) From February 2024 to May 2025, I streamed myself doing all the labs for MIT’s old Operating Systems Engineering course (6.828 (2018)). Through doing this, I became very familiar with JOS, which is the x86 OS used for the course. This is the OS which I work with in all of my streams. I had almost no experience with OS development when I started, although I did have much experience with programming and low level concepts. I did the coursework because I wanted to write my own OS, but felt I wasn’t ready. Now, from May 2025 to present, I’m pursuing my own learning agenda with OS development. Eventually I will start writing my own OS when the time is right! If this resonates with you, please subscribe and I'll see you in a stream :) 00:00:00 start 00:02:14 Exploring unit tests for the bitmap allocator 00:12:02 Setting up catch2 testing library and vendoring it into the project 00:25:00 Configuring build system to create host binaries vs cross-compiled binaries 00:51:00 Integrating catch2 into CMake build system 01:10:00 Debugging compilation and feature detection issues with cross-compiler 01:35:00 Successfully resolving catch2 build problems with workarounds 02:03:00 Writing the first unit test for bitmap allocator with mock data 02:22:00 Creating helper classes for easier test data setup 02:34:00 Completing working unit test suite and wrapping up the stream