MerlionOS v0.2.0 — Full Roadmap Complete

MerlionOS v0.2.0 — Full Roadmap Complete

All 16 development phases delivered. From bare-metal boot to a feature-rich hobby OS.

Stats

• 27 source modules, ~4,100 lines of Rust
• 30+ shell commands
• 7 syscalls
• 16 phases from zero to a functional OS

What's New Since v0.1.0

Phase 11 — RTC & Testing

• CMOS real-time clock with date command
• 15 built-in kernel self-tests (test command)
• lib.rs refactor for module reuse

Phase 12 — Graphics

• 160×50 software framebuffer via VGA half-block characters (▀▄█)
• Drawing primitives: pixel, line (Bresenham), rect, circle (midpoint)
• Singapore flag demo (gfx command)

Phase 13 — Storage

• PCI bus enumeration (lspci command)
• 128K RAM disk with custom "MRLN" flat filesystem
• format, disk, dls, dsave, dload commands

Phase 14 — Networking

• IPv4/UDP types, MAC/IP address formatting
• Loopback network interface with packet queue
• ifconfig, send, recv commands

Phase 15 — SMP

• CPUID leaf parsing: vendor, brand, family/model/stepping
• Feature detection: APIC, x2APIC, SSE, SSE2, AVX
• Per-CPU state tracking, cpuinfo command

Phase 16 — User-Space Library

• Rust syscall wrappers: write, exit, yield, getpid, sleep, send, recv
• Convenience functions (println, write_num) without allocator
• Example user programs in Rust

Full Feature List

Category	Features
Boot	Bootloader 0.9, VGA banner, serial logging
CPU	GDT+TSS, IDT, PIT 100Hz, CPUID, APIC detection
Memory	Frame allocator, 64K heap, per-process page tables
Tasks	Preemptive round-robin, context switch, spawn/kill
User-mode	Ring 3 via iretq, int 0x80 syscalls, page table isolation
IPC	Bounded channels, producer/consumer
Filesystem	VFS (/dev, /proc, /tmp), RAM disk with MRLN format
Graphics	160×50 framebuffer, 16 colors, drawing primitives
Network	IPv4/UDP loopback, ifconfig
Drivers	Registration framework, 7 built-in drivers
Shell	30+ commands, ANSI colors, PS/2 keyboard
System	RTC clock, ACPI shutdown/reboot, PCI scan