week 115, streaming kernel dev right now topic: kernel threads continue with properly cleaning up task stacks at the end of a task lifetime, probably implementing some kind of deferred task cleanup see ya 👋 youtube.com/live/eFS0hb...

week 114, streaming kernel dev right now topic: scheduling working more on scheduler stuff -> idle task, scheduling policies, mapping the stack, etc see ya 👋 youtube.com/live/ap76Lb...

week 113, streaming kernel dev right now topic: kernel threads continuing with scheduling/kernel threads, working on thread exit, an idle task, and properly mapping stacks instead of using the physmap see ya 👋 youtube.com/live/DM13pq...

week 112, streaming kernel dev right now topic: scheduling continue on scheduling, refactoring the yield path with an idea to remove the global scratch buffer. and then creating an api to allow tasks to exit see ya 👋 youtube.com/live/Jtw6fD...

week 111, streaming kernel dev right now topic: kernel threads (cooperative) continuing with scheduler work today, will fix some interrupt-safety topics and generally continue this line of work see ya 👋 youtube.com/live/VRukq7...

week 109, streaming kernel dev right now topic: kernel threads (cooperative) last week, we started a basic scheduler/thread implementation and got a single kernel thread running. going to work on switching between threads today see ya 👋 youtube.com/live/wWDHk4...

week 104, streaming kernel dev right now topic: x86_64 interrupts last week we started interrupts and got the most basic divide by zero exception handler working. will continue and flesh it out with a trap frame and handling it in c++ see ya 👋 youtube.com/live/h6HwJD...

week 103, streaming kernel dev right now topic: x86_64 interrupts i'm moving on to setting up interrupts. i already did this before on JOS, but now will revisit it on 64 bit to learn how that differs, including new concepts like the IST see ya 👋 youtube.com/live/vVzgOE...

week 102, streaming kernel dev right now topic: virtual memory last week we got the kernel running on its own page tables for the first time. will continue with fleshing out the kernel's virtual address space see ya 👋 youtube.com/live/iJMQcC...

week 101, streaming kernel dev right now topic: virtual memory last week we got vm unmap started. might continue with this, but also might sanity check that basic mappings work within qemu. haven't done that yet, we have only used the unit tests so far see ya 👋 youtube.com/live/_PH6kF...

week 100! streaming kernel dev topic: virtual memory unmap continuing with virtual memory, i start working on a function to unmap pages from an address space. tried using a TDD approach which worked well! prerecorded since I'm at #39c3! see ya 👋 www.youtube.com/watch?v=rqp...

week 99, streaming kernel dev right now topic: virtual memory last week we started implementing support for mapping memory using page tables, along with a basic unit test. will continue with this this week! see ya 👋 youtube.com/live/J63PmB...

week 98, streaming kernel dev right now topic: virtual memory last week, we got the page table code harnessed and runnable in a unit test. still not sure that's a good idea, but will continue with implementing virtual memory see ya 👋 youtube.com/live/3sWoM-...

week 97, streaming kernel dev right now topic: virt mem/page tables continuing with virtual memory/page tables. i'm interested to see to what extent I can make my page table code unit testable, will give this a try see ya 👋 youtube.com/live/xJAo_p...

I was interviewed by @Raspberry_Pi for my dayjob embedded systems work at @Ableton! It's about Ableton Move, which is our portable device for making music. It's powered by a Raspberry Pi Compute Module, which has been great to work with :) Check it out: www.youtube.com/watch?v=G85...

week 96, streaming kernel dev topic: page tables got started on a simple virt address class that makes it easier to extract the bits needed for page table indexing. will be useful for doing page table walks (prerecorded since I'm away) see ya 👋 youtu.be/LRZ40QCKUno...

Long shot, but does anyone have an extra CCC ticket I could buy? Wasn’t able to get one in the open sales :/ I’d love to organize another hobby OS dev meetup and maybe do a small kernel dev workshop for anyone interested. Could also bring some merch to sell from shop.offlinemark.com ! 🙏

week 94, streaming kernel dev topic: physmap Working on some unit tests for the physmap physToVirt() and virtToPhys() functions today. Testing out LLM assisted unit test generation (Prerecorded since I'm away) see ya 👋 youtu.be/oXY1ylrW6GM

week 93, streaming kernel dev right now topic: virtual memory last week we finished the bitmap allocator, complete with unit tests. will continue on whatever's next, probably using that to allocate page tables and set up virtual memory see ya 👋 youtube.com/live/SO7x0Z...

week 82, streaming kernel dev right now topic: c++ STL last week we got c++ working in the cmake build. now that we have that working, continuing today with trying out some embedded/freestanding STL options see ya 👋 youtube.com/live/-ukB4U...

week 81, streaming kernel dev right now topic: lldb, c++, STL last week we got all the clang/llvm work ported over to cmake. will continue with using lldb instead of gdb, then moving on to c++ support (hopefully including some kind of STL to use) see ya 👋 youtube.com/live/lJRi_h...

week 80, streaming kernel dev right now topic: clang/c++ cmake last week we got limine integrated into cmake, will continue with porting the clang/c++ support I previously worked on, into cmake see ya 👋 youtube.com/live/jwvHrq...

week 66, streaming kernel dev right now topic: networking last week we finally got RX working and received network data into userspace. continuing with networking today and likely finish the networking lab see ya 👋 youtube.com/live/7X8WKy...

week 59, streaming kernel dev right now topic: network driver continuing with last week's work to get the nic initialized! see ya 👋 youtube.com/live/Gf6Y_Q...

week 57, streaming kernel dev right now topic: network/NIC driver after learning last week about qemu networking, today we're going to work on initializing the network card via PCI and accessing it via mmio see ya 👋 youtube.com/live/cFfENG...

week 56, streaming kernel dev right now topic: network driver starting the network driver, which is the final lab of the coursework I'm following (also, multi-streaming to twitch today for the first time) see ya 👋 youtube.com/live/j4o7Km...

week 54, streaming kernel dev topic: filesystem / process spawn streaming some filesystem dev and debugging, then moving onto start process spawning (prerecorded since i'm away today, back live next week - see ya 👋) www.youtube.com/watch?v=E0K...

week 55, streaming kernel dev right now topic: exec / spawn syscall now that we have a filesystem, we can try to exec programs from disk :) working on this today see ya 👋 youtube.com/live/-FeYOM...

week 53, streaming kernel dev right now topic: filesystem working on the core fs routines for walking the filesystem to find disk blocks see ya 👋 youtube.com/live/zTUK5f...

week 52! streaming kernel dev right now topic: continue hacking on the filesystem see ya 👋 youtube.com/live/3o-CYb...

week 51, streaming kernel dev right now topic: filesystem needed to debug some boot issues last week after merging in the new lab code; will actually start the filesystem work today see ya 👋 youtube.com/live/bNg7oQ...

week 50! streaming kernel dev right now topic: begin filesystem finished the multicore/fork/IPC labs last week, beginning filesystem work this week 🤠 see ya 👋 youtube.com/live/kVPJ95o...

week 49, streaming kernel dev right now topic: basic IPC working on a basic IPC system so processes can send messages between each other see ya 👋 youtube.com/live/35QuRw...

week 48, streaming kernel dev topic: debug final bugs with COW fork syscall debugging a subtle bug in my COW fork support: I didn't realize that the child will immediately fault in its stack when it gets execution after the fork (prerecorded since I'm at CCC!) youtu.be/ohT3ZHI4kRc

week 47, streaming kernel dev right now topic: preemptive multitasking very exciting! we've only had cooperative multitasking with explicit yields so far — now it's time to implement preemption with a timer interrupt see ya 👋 youtube.com/live/CfEJOB...

week 46, streaming kernel dev right now topic: copy on write fork() in userspace continuing with this now that I finally understand this "UVPT" recursive page table mechanism for mapping the page tables so they're accessible from userspace see ya 👋 youtube.com/live/ura43M...

week 45, streaming kernel dev right now topic: copy on write fork() in userspace now that we have userspace page fault handling working, we can proceed to the lab where we implement copy on write fork, entirely in userspace see ya 👋 youtube.com/live/PjsXpSu...

hit a milestone, 5000 subs on youtube 🤯 a heartfelt thank you to anyone who has joined, watched, commented, or supported my streams in any way 🙏 it's really wild how much you can learn by just practicing something for 2 hours a week, every week. next stop: 52 weeks of kernel dev 🌽 🤓

week 44, streaming kernel dev topic: userspace page fault handling prequel to week 43, worked on the kernel-mode syscall support behind userspace PF handling (incl. recursive page fault support) (pre-recorded since I'm away this week ✌️) https://www.youtube.com/watch?v=5fv6Pjx3in8

week 43, streaming kernel dev right now topic: userspace page fault handling making decent progress, will work on the assembly stub that returns control back to the user thread see ya 👋 #programming https://youtube.com/live/WcbInYfBAOQ?feature=share

hello world 👋 will start posting my hobby kernel development streams here (every sunday, 10am ET)