September, 2025

Writing an OS Kernel from Scratch – Part 2: Hello World Analysis “You think ‘Hello World’ is just printing a line? In an OS kernel, it hides the secrets of boot flow, memory layout, and hardware protocols.” In the previous post, we successfully had our kernel output “Hello from the kernel!” on QEMU. Looks simple,... » read more

Writing an OS Kernel from Scratch – Part 10: Virtual File System and ext2 Implementation “Initramfs is just a toy; a real OS needs persistent storage. Today, we design the VFS abstraction layer and implement the first disk filesystem — ext2!” In the previous post, we used an in-memory Initramfs for user program loading, but... » read more