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Hello world boot loader
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| use16 | |
| org 0x7c00 | |
| start: jmp boot | |
| msg db "Hello, world!", 0 | |
| print: | |
| lodsb | |
| or al, al | |
| jz return | |
| mov ah, 0eh | |
| int 10h | |
| jmp print | |
| return: | |
| ret | |
| boot: | |
| xor ax, ax | |
| mov ds, ax | |
| mov es, ax | |
| mov si, msg | |
| call print | |
| xor ax, ax | |
| cli | |
| hlt | |
| times 510 - ($-$$) db 0 ; padding | |
| dw 0xAA55 ; boot signature |
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| NASM=nasm | |
| QEMU=qemu-system-i386 -curses | |
| all: | |
| nasm -f bin -o boot.bin boot.asm | |
| dd if=/dev/zero of=floppy.img bs=512 count=1 &> /dev/null | |
| dd if=boot.bin of=floppy.img conv=notrunc | |
| run: floppy.img | |
| $(QEMU) -fda $< |
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