Boot Sequence

1. The bootloader (e.g. GRUB) loads the kernel image.
2. Arch-specific boot code initializes the CPU and essential peripherals.
3. Kernel initializes subsystems: debugging, memory, process, thread, etc. (kernel/1. boot.c)
4. Kernel creates the very first userland process from bootfs.
5. The first userland process (typically vm) spawns servers from bootfs.