Building a custom operating system requires a reliable way to move from the computer’s bare hardware initialization into your own kernel code.
Instead of writing a complex, hardware-specific bootloader from scratch, most OS developers rely on the Multiboot specification. This standard works like a universal contract between the bootloader, such as GRUB, and the operating system.
By embedding a Multiboot Header inside the first 8 KB of your kernel binary, the bootloader can identify your OS, load it into physical memory, switch the CPU into 32-bit protected mode, and pass essential hardware information, including the system memory map, to your entry point.
This article breaks down that process from start to finish in a clean, conceptual way.
Unlock the full guide here: [Multiboot Explained: How Bootloaders Load Operating Systems — The CyberSec Guru]
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