https://www.youtube.com/@offlinemark
This is my personal roadmap for my OS development project. It should not be confused with a roadmap for how to learn OS development!
Milestone 1: JOS
- ✅ Lab 1: Boot
- ✅ Lab 2: Memory Management
- ✅ Lab 3: User Environments (Processes)
- ✅ Lab 4: Preemptive Multitasking
- ✅ Lab 5: Filesystem, Spawn, Shell
- ✅ Lab 6: Network card driver
Milestone 2: Modern OS Foundation
- ✅ Try bootloaders
- ✅ Multiboot V1 (Grub)
- ✅ Multiboot V2 (Grub)
- ✅ Limine (BIOS)
- ✅ Limine (UEFI)
- ✅ C++ support in JOS
- ✅ Port to x86_64
- ✅ Modern LLVM toolchain
- ✅ Clang instead of GCC
- ✅ cc-runtime (compiler-rt) instead of libgcc
- ✅ LLD Linker
- ✅ LLDB Debugger
- ✅ Port JOS to CMake
- ✅ Third party C/C++ libraries
- ✅ STL
- ✅ ETL
- ✅ Frigg
- ✅ Musl libc
- ✅ Unit test infrastructure (For generic code – runs in userspace on dev machine)
Milestone 3:
- ✅ Basic virtual address space management (mapping)
- ✅ Basic Interrupts/Exception support
- ✅ Task infrastructure
- ✅ Task structure
- ✅ Task stacks
- ✅ Task stack guard pages
- ✅ Scheduler infrastructure
- ✅ Task infrastructure
- ✅ Basic first scheduling policy (Round Robin)
- ✅ Deferred task cleanup
- ✅ Cooperative multitasking
- ✅ taskYield() – cooperative yield
- Task Scheduler APIs
- ✅ taskExit()
- ✅ Safe stack cleanup (Deferred task destruction)
- ✅ taskWaitForTaskExit()
- ✅ taskSleepCpuCycles()
- No timer interrupt yet. Wake up happens in the scheduler, which needs to be driven by some polling task.
- ✅ Integration test infrastructure (Runs in kernel in QEMU – special boot mode)
- ✅ taskExit()
- ✅ Preemptive Multitasking
- ✅ LAPIC Timer Interrupt
- Concurrency Primitives
- Spinlock
- Mutex
- Semaphore
- Condition Variable?
- Drivers
- Serial console
Future:
- Processes (Task Groups)
- More advanced scheduler
- Audio
- USB
- Kernel Objects
- SMP / Multicore
- Per CPU State (GS)
- Coroutines (In Kernel?)
- Userspace
- IPC
- Graphics
- Drivers
- Filesystem
- ASLR
- Accelerate syscalls (Syscall instruction)
- ARM64
- RISCV