kernel-ark/include/asm-sparc64/pil.h
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

27 lines
872 B
C

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