Gen2/Gen3 Feature Comparison

Feature	Gen2	Gen3	Notes
Low level assembly access	✅	✅	Before X# now x64 NASM + ARM64 GAS assembly.
ACPI	✅	✅	LAI (Lightweight ACPI Implementation) via C interop.
Interrupt Handling	✅	✅	x64: APIC (Local + I/O). ARM64: GIC.
Memory Management	✅	✅
Driver support	✅	✅	PCI and MMIO over the driver kit; the platform bus seeded from ACPI, the device tree (ARM64) or the machine's table; PCI Express hot-plug on root ports
Garbage Collection	✅	✅	Mark-and-sweep GC
Filesystem	✅	✅	FAT12/16/32 on a Unix-style VFS (mount, superblocks, inodes) with formatting; MBR/GPT/EBR partitioning. Exposed through System.IO.File/FileStream.
.NET core library features	🟡	🟡 Partial	Core types work (String, Collections, List, Dictionary). Math, Console, DateTime, Random, BitOperations, System.IO.File plugged.
Plug system	✅	✅
Test Framework	✅	✅
Debugger	✅	🟡 Partial	Source link + variables bugs in vscode
CPU/FPU accelerated math	✅	✅	x64 only: x87 FPU (sin/cos/tan/exp/log/atan)
Cosmos Graphic Subsystem	✅	✅	The firmware framebuffer via Limine, plus the virtio-gpu, VMware SVGA II, AMD DCN 3.1.5 and Intel integrated graphics display drivers over the driver kit (SVGA3D on the VMware one).
Network interface	✅	✅
Timer / Clock	✅	✅
Keyboard Input	✅	✅	PS/2 (x64), virtio and USB keyboards, all as driver kit drivers
Mouse Input	✅	✅	PS/2 (x64), virtio and USB mice, all as driver kit drivers
Audio interface	🟡	✅	Intel HD Audio: WAV playback, generated streams and Console.Beep. Playback only, one stream per output.

Additional Gen3 Features

Beyond Gen2 parity, Gen3 brings new capabilities:

Feature	Status	Notes
NativeAOT Runtime	🟡 Partial	Full NativeAOT compilation with runtime, no IL2CPU.
ARM64 Support	✅
Limine Boot Protocol	✅
Threading & Scheduler	✅	Priority-based stride scheduler (x64 + ARM64). lock keyword supported.
Feature Flags	✅
Cosmos Vs Code Extension	✅
USB Support	✅	xHCI host controller with hubs and hot-plug (x64 + ARM64) as driver kit drivers, with the HID boot keyboard, HID boot mouse and mass storage (Bulk-Only Transport) class drivers. No EHCI yet.

Future Releases

Features planned after first release:

Feature	Status	Notes
SMP (Symmetric Multiprocessing)	❌ Not Started	Multi-core AP boot, per-CPU scheduling, load balancer.
HTTPS	❌ Not Started	TLS/SSL implementation, certificate handling, secure sockets.
Generational GC	❌ Not Started	Replace current mark-and-sweep with generational collector (Gen0/Gen1/Gen2) for better performance.
Code execution	❌ Not Started	Userland WASM VM
The GIC, the ITS and the clocks from the device tree	❌ Not Started	Today the ARM64 interrupt controller comes from ACPI or the virt defaults, so an acpi=off boot has no MSI; the platform bus already reads the tree. x64 never has one.
PCI hot-plug beyond native PCI Express slots	❌ Not Started	ACPI (GPE) hot-plug, which QEMU uses on q35's root ports without the ICH9-LPC global and on conventional PCI bridges; downstream switch ports are matched but untested.