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Diffstat (limited to 'include/asm-sparc64/pil.h')
| -rw-r--r-- | include/asm-sparc64/pil.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/include/asm-sparc64/pil.h b/include/asm-sparc64/pil.h new file mode 100644 index 000000000000..8f87750c3517 --- /dev/null +++ b/include/asm-sparc64/pil.h @@ -0,0 +1,26 @@ +/* $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) */ |