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

.define .set
.text

        ! #bytes in cx
        ! bit # in ax
.set:
        pop     bx              ! return address
        xor     dx,dx
!ifdef create set
        sub     sp,cx
        push    bx
        push    di
        mov     bx,sp
        xor     di,di
        sar     cx,#1
1:
        mov     4(bx)(di),dx
        inc     di
        inc     di
        loop    1b
!endif
        mov     bx,#8
        div     bx
        cmp     ax,di
        jae     2f
        mov     di,dx
        movb    dl,bits(di)
        mov     di,sp
        add     di,ax
        orb     4(di),dl
        pop     di
        ret
2:
ESET = 2
.extern .error
        pop     di
        mov     ax,#ESET
        call    .error
        ret

        .data
bits:
        .data1   1,2,4,8,16,32,64,128