source: trunk/minix/lib/i86/em/em_and.s@ 9

.define .and

        ! #bytes in cx
        ! save di; it might be a register variable

        .text
.and:
        pop     bx              ! return address
        mov     dx,di
        mov     di,sp
        add     di,cx
        sar     cx,#1
1:
        pop     ax
        and     ax,(di)
        stos
        loop    1b
        mov     di,dx
        jmp     (bx)