> actually i don't want the pipelining be interrupted while run our user
> defined instructions.
If you want to guarantee that, you need to put that code into a kernel
module that turns off interrupts during processing - and you need to
accept responsibility for the fact that a problem in your code may be
irrecoverably fatal to the system, and that errors in system timing may
accumulate due to clock interrupts not being serviced.
Regards,
Kevin K.
