bits 16 org 0x7c00 boot: mov ax, 0x2401 int 0x15 mov ax, 0x3 int 0x10 mov [disk],dl mov ah, 0x2 ;read sectors mov al, 1 ;sectors to read mov ch, 0 ;cylinder idx mov dh, 0 ;head idx mov cl, 2 ;sector idx mov dl, [disk] ;disk idx mov bx, copy_target;target pointer int 0x13 cli lgdt [gdt_pointer] mov eax, cr0 or eax,0x1 mov cr0, eax mov ax, DATA_SEG mov ds, ax mov es, ax mov fs, ax mov gs, ax mov ss, ax jmp CODE_SEG:boot2 gdt_start: dq 0x0 gdt_code: dw 0xFFFF dw 0x0 db 0x0 db 10011010b db 11001111b db 0x0 gdt_data: dw 0xFFFF dw 0x0 db 0x0 db 10010010b db 11001111b db 0x0 gdt_end: gdt_pointer: dw gdt_end - gdt_start dd gdt_start disk: db 0x0 CODE_SEG equ gdt_code - gdt_start DATA_SEG equ gdt_data - gdt_start times 510 - ($-$$) db 0 dw 0xaa55 copy_target: bits 32 hello: db "Hello more than 512 bytes world!!",0 boot2: mov esi,hello mov ebx,0xb8000 .loop: lodsb or al,al jz halt or eax,0x0F00 mov word [ebx], ax add ebx,2 jmp .loop halt: cli hlt times 1024 - ($-$$) db 0