building an OS (all streams)

Currently Playing: building my own operating system in c++ (week 100!, virtual memory unmap)

(detailed timestamps in comments) #livecoding #operatingsystem #coding welcome: https://offlinemark.com/welcome discord: https://discord.gg/P6zQBsD2ng 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. 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, and starting my on own OS. If this resonates with you, please subscribe and I'll see you in a stream :) 00:00:00 Start 00:01:56 Review of current virtual memory progress and unit testing approach 00:04:17 Development environment improvements with clangd and VS Code extensions 00:06:39 Planning unmap functionality and memory permissions discussion 00:19:19 Test-driven development approach for unmap feature implementation 00:22:01 Complex testing scenarios including aliasing and non-aliasing cases 00:34:03 Mock physical memory allocator modifications for testing frame deallocation 00:39:59 AI-assisted implementation of unit test code for page table validation 00:45:09 Step-by-step implementation of unmap function with AI assistance 00:55:59 Successful test completion and week 100 wrap-up