VoidFrame Kernel Development Checklist

This file tracks the current status of all core OS features for VoidFrame.

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🧱 Core Infrastructure

• Bootloader (GRUB2 with Multiboot2)
• GDT & TSS setup
• IDT & Interrupt Handling
• PIC remapping & IRQ handling
• PIT / Timer setup
• Basic printf to VGA text mode
• Kernel memory allocator
• Panic screen with ASCII art (yes this is mandatory)

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🧠 Memory Management

• Physical memory manager (free list or bitmap)
• Page table setup (paging enabled)
• Virtual memory mapping API (vmem_map(), etc.)
• Kernel heap (virtual, malloc/free)
• Per-process page tables
• User-mode memory protection

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⚙️ Process Management & Scheduling

• Process control block (PCB)
• Scheduler (MLFQ)
• Context switching
• Preemption via PIT
• Process creation
• Process termination
• Token/privilege-based validation
• Scheduler aging/starvation fix
• CFS or vruntime-based scheduler (optional/bonus)

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🔐 Ring 3 Support (Userspace) (unmaintained)

• User-mode process flag
• IRETQ from syscall/interrupt
• Syscall handling (syscall or int 0x80)
• Userland stack setup
• Memory isolation (Ring 3 can't touch kernel)
• Transitioning back to kernel on syscall

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🧩 Module System

• Multiboot2 module loading
• Basic kernel extensions (vmod)
• Signature/token validation
• Hot module unloading (optional)
• Module registration system

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📦 ELF Executable Support

• ELF64 header parsing
• Program header mapping (PT_LOAD)
• Set up new stack
• Jump to entry point
• Static binaries only (no relocations)
• Dynamic linker / interpreter (WAY later)

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🧠 Init System

• Boot SKIS (SecureKernelIntegritySubsystem)
• Create init process from vmod or ELF
• Init spawns userland shell or TUI

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💬 IPC / Syscalls

• Syscall dispatch system
• Basic message passing (pipe, queue, or buffer)
• Shared memory region
• Signals or async delivery
• Named channels or sockets

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📁 Filesystem & I/O

• Initrd loading
• Basic filesystem parsing (e.g., tarfs or ext2-lite)
• Read/write file API (fs_open(), etc.)
• VFS layer (optional)
• Device files (/dev/null, /dev/tty0, etc.)

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🧑‍💻 Userland Development

• Userspace C runtime (libc-lite)
• Shell (sh.vmod or sh.elf)
• Basic CLI utilities (cat, ls, echo, etc.)
• Keyboard driver routed to userland
• VGA console or terminal emulator

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🔧 Debug & Developer Features

• Print kernel logs to VGA
• Serial logging
• dmesg-style kernel log buffer
• Stack backtrace / panic debug dump
• Memory usage counters

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🌈 Extra Spice (optional but cool)

• Framebuffer graphics support (UEFI mode)
• Loadable GUI modules
• Virtual terminal switching (tty0, tty1)
• Profiling support (ticks per process)
• Syscall tracing / log
• Live module patching

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🏁 Final Goals (v1.0 release)

• Bootable ISO with GRUB2 EFI support
• Fully self-hosted userland shell
• User process execution (ELF64)
• Init system + FS + IPC working
• At least one userland demo program