Back to UTCB IPC

[Adam Lackorzynski]

On Sat Oct 10, 2009 at 10:51:02 +0800, Guanghui, Cheng wrote:
> Hello:
> 	I pushed this old mail to top and i want to know something about UTCB IPC.
> > > UTCB values stays the same. It depends on the generated stub whether
> > > UTCB IPC is actually used or not. Sending a flexpage, usually
> > > disqualifies the usage of UTCB IPC.
> >
> > Do you mean, once a flexpage is sent no UTCB IPC should be sent after ?
> 	I am interested in the question above because in the Thread::transfer_msg 
> function as this:
> 1343   sender_regs->copy_msg (dst_regs);
> 1344
> 1345   copy_utcb_to (tag, receiver);
> 	It seems every time the utcb ipc will follow the register ipc. Is it right?

Yes, actually there's no difference.



Adam
-- 
Adam                 adam at os.inf.tu-dresden.de
  Lackorzynski         http://os.inf.tu-dresden.de/~adam/