This is a custom 32-bit x86 protected-mode kernel built by following the 539kernel guide (A Journey in Creating an Operating System Kernel). It includes a simple bootloader, descriptor tables, interrupt handlers, and core OS features inspired by the 539kernel project.

Features:

• Protected-mode boot: 16-bit bootloader that enables the A20 line, sets up the GDT, and switches to 32-bit mode.
• GDT/IDT: Flat segment descriptors (GDT) for code/data and an IDT for CPU exceptions and IRQs.
• Multitasking scheduler: Preemptive, round-robin context-switching on each timer tick.
• Virtual memory paging: 4 GiB linear address space via basic page tables.
• Disk I/O & FS: Basic ATA driver and simple filesystem for reading, creating files from disk.
• Console I/O: VGA text-mode output for simple user interaction.

Build and Run:
The kernel is compiled with gcc and nasm and run under QEMU/Bochs. It demonstrates the key OS concepts (multitasking, paging, interrupts) taught by the 539kernel book.