arch/sparc/include/asm/pil.h

   1 #ifndef _SPARC64_PIL_H
   2 #define _SPARC64_PIL_H
   3
   4 /* To avoid some locking problems, we hard allocate certain PILs
   5  * for SMP cross call messages that must do a etrap/rtrap.
   6  *
   7  * A local_irq_disable() does not block the cross call delivery, so
   8  * when SMP locking is an issue we reschedule the event into a PIL
   9  * interrupt which is blocked by local_irq_disable().
  10  *
  11  * In fact any XCALL which has to etrap/rtrap has a problem because
  12  * it is difficult to prevent rtrap from running BH's, and that would
  13  * need to be done if the XCALL arrived while %pil==15.
  14  */
  15 #define PIL_SMP_CALL_FUNC       1
  16 #define PIL_SMP_RECEIVE_SIGNAL  2
  17 #define PIL_SMP_CAPTURE         3
  18 #define PIL_SMP_CTX_NEW_VERSION 4
  19 #define PIL_DEVICE_IRQ          5
  20 #define PIL_SMP_CALL_FUNC_SNGL  6
  21
  22 #endif /* !(_SPARC64_PIL_H) */