fernlader/boot16.S

            // vim: et:sw=12:ts=12:sts=12

            .global     _start
            .text
            .code16

_start:
            mov         %cs, %ax
            mov         %ax, %ds

            push        $message
            call        print
            add         $2, %sp

1:          hlt
            jmp         1b
            
print:      push        %bp
            mov         %sp, %bp
            push        %bx
            push        %si

            xor         %bx, %bx
            mov         4(%bp), %si

1:          lodsb
            or          %al, %al
            jz          2f
            mov         $0x0E, %ah
            int         $0x10
            jmp         1b

2:          pop         %si
            pop         %bx
            mov         %bp, %sp
            pop         %bp
            ret

message:    .asciz     "Hello, World!"