Linux kernel series -12.a. Operating system development from loader to kernel

Loader to do two things, let's start with the first item, load the kernel into memory:

1. Load the kernel into memory.

2. Jump into protected mode.

When you first compile a no-kernel:

NASM Boot.asm-o Boot.bin

NASM Loader.asm-o Loader.bin

DD if=boot.bin of=a.img bs=512 count=1 conv=notrunc

sudo mount-o loop a.img/mnt/hgfs/

sudo cp loader.bin/mnt/hgfs/-V

sudo umount/mnt/hgfs/

The results of the operation are as follows:

Next, compile the kernel and write it to the floppy image:

Nasm-f Elf-o KERNEL.O kernel.asm

Ld-m elf_i386-s-o kernel.bin kernel.o

sudo mount-o loop a.img/mnt/hgfs/

sudo cp kernel.bin/mnt/hgfs/-V

sudo umount/mnt/hgfs/

The results of the operation are as follows:

No longer "no KERNEL", we see that a dot appears behind the loading, indicating that loader read a sector. However, we do not have any other work to do except load the kernel into memory, so we can see "ready." , no other phenomenon arises.

" Source "

Linux kernel series -12.a. Operating system development from loader to kernel