.text
    mfc0    $a0 $12                 # read from the status register
        ori     $a0 0xff11              # enable all interrupts
        mtc0    $a0 $12                 # write back to the status register

        li      $a0 2                   # enable keyboard interrupt
        sb      $a0 0xffff0013

    li  $t9 10000
    li  $t0 0
    mtc1.d  $t0 $f2
    cvt.d.w $f2 $f2
    li  $t1 4
    mtc1.d  $t1 $f4
    cvt.d.w $f4 $f4
    li  $t2 2
    mtc1.d  $t2 $f6
    cvt.d.w $f6 $f6
    li  $t3 1
    mtc1.d  $t3 $f8
    cvt.d.w $f8 $f8

    mtc1.d  $t3 $f12
    cvt.d.w $f12    $f12

    mtc1.d  $t3 $f10
    cvt.d.w $f10    $f10

next:   sub $t9 $t9 2
    mov.d   $f8 $f12
    div.d   $f8 $f8 $f10
    add.d   $f2 $f2 $f8
    add.d   $f10    $f10    $f6
    mov.d   $f8 $f12
    div.d   $f8 $f8 $f10
    sub.d   $f2 $f2 $f8
    add.d   $f10    $f10    $f6
    beqz    $t9 end
    j   next

end:
    mul.d   $f2 $f2 $f4
    mov.d   $f12    $f2
    li  $v0 3
    syscall


.ktext  0x80000180                      # kernel code starts here
        mfc0    $k0 $12                 # !! disable interrupts
        andi    $k0 $k0 0xfffe          # !!
        mtc0    $k0 $12                 # !!
    eret