include/asm-sparc64/pil.h

   1 /* $Id: pil.h,v 1.1 2002/01/23 11:27:36 davem Exp $ */
   2 #ifndef _SPARC64_PIL_H
   3 #define _SPARC64_PIL_H
   4
   5 /* To avoid some locking problems, we hard allocate certain PILs
   6  * for SMP cross call messages that must do a etrap/rtrap.
   7  *
   8  * A local_irq_disable() does not block the cross call delivery, so
   9  * when SMP locking is an issue we reschedule the event into a PIL
  10  * interrupt which is blocked by local_irq_disable().
  11  *
  12  * In fact any XCALL which has to etrap/rtrap has a problem because
  13  * it is difficult to prevent rtrap from running BH's, and that would
  14  * need to be done if the XCALL arrived while %pil==15.
  15  */
  16 #define PIL_SMP_CALL_FUNC       1
  17 #define PIL_SMP_RECEIVE_SIGNAL  2
  18 #define PIL_SMP_CAPTURE         3
  19 #define PIL_SMP_CTX_NEW_VERSION 4
  20 #define PIL_DEVICE_IRQ          5
  21
  22 #ifndef __ASSEMBLY__
  23 #define PIL_RESERVED(PIL)       ((PIL) == PIL_SMP_CALL_FUNC || \
  24                                  (PIL) == PIL_SMP_RECEIVE_SIGNAL || \
  25                                  (PIL) == PIL_SMP_CAPTURE || \
  26                                  (PIL) == PIL_SMP_CTX_NEW_VERSION)
  27 #endif
  28
  29 #endif /* !(_SPARC64_PIL_H) */