api.changes

xenomai 很好的linux实时补丁

Scheduled modifications:
 o Counting, thus nestable rtdm_irq_enable/disable. This will provide a clean
   interface to leave the IRQ line disabled when returning from an ISR and
   re-enable it later from task context.
 o Timer API. This will allow to execute timed operations with lower jitter
   inside the timer IRQ context.
 o Packet pool management (generalised variant of RTnet's and RT-Firerwire's
   buffer pools).

Revision 4:
 o Dropped RTDM_IRQ_PROPAGATE ISR return flag. Generic deterministic RTDM
   drivers should not interact with standard Linux in this way.
 o Merged RTDM_IRQ_ENABLE into RTDM_IRQ_HANDLED return code. An explicit
   request to leave the IRQ line disabled upon return from ISR will be
   provided in later versions via rtdm_irq_disable.
 o Added RTDM_IRQTYPE_SHARED and RTDM_IRQTYPE_EDGE flags which indicate
   specific handling sharable level- and edge-triggered IRQs
 o Added rtdm_mmap_to_user and rtdm_munmap. Intended usage is the mapping of
   driver memory like DMA buffers into the address range of a user task.