Hello world
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| ; boot.asm | |
| ; setup segment register | |
| mov ax, 0x07c0 | |
| mov ds, ax | |
| ; setup display | |
| mov ah, 0x0 ;setup video mode | |
| mov al, 0x3 ;0x3 = text mode, color, 80x25 | |
| int 0x10 ;0x10 = video service | |
| mov si, msg ;target of lodsb | |
| mov ah, 0x0E ;0x0E = tty | |
| print_character_loop: | |
| lodsb | |
| or al, al | |
| jz hang ;jump if zero | |
| int 0x10 ;when ah is 0x0E, then print | |
| jmp print_character_loop | |
| msg: | |
| db 'Hello World!', 13, 10, 0 ;13 = \r, 10 = \n, 0 = NULL | |
| hang: | |
| jmp hang | |
| times 510-($-$$) db 0 | |
| ; this is a comment | |
| db 0x55 | |
| db 0xAA |
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| boot.bin: boot.asm | |
| nasm -f bin boot.asm -o boot.bin | |
| qemu: boot.bin | |
| qemu-system-x86_64 -curses boot.bin | |
| clean: | |
| rm *.bin |
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