| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | * |
| David S. Miller | fd0504c3 | 2006-06-20 01:20:00 -0700 | [diff] [blame^] | 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(). |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
| David S. Miller | ee29074 | 2006-03-06 22:50:44 -0800 | [diff] [blame] | 19 | #define PIL_SMP_CTX_NEW_VERSION 4 |
| David S. Miller | fd0504c3 | 2006-06-20 01:20:00 -0700 | [diff] [blame^] | 20 | #define PIL_DEVICE_IRQ 5 |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | |
| 22 | #ifndef __ASSEMBLY__ |
| 23 | #define PIL_RESERVED(PIL) ((PIL) == PIL_SMP_CALL_FUNC || \ |
| 24 | (PIL) == PIL_SMP_RECEIVE_SIGNAL || \ |
| David S. Miller | ee29074 | 2006-03-06 22:50:44 -0800 | [diff] [blame] | 25 | (PIL) == PIL_SMP_CAPTURE || \ |
| 26 | (PIL) == PIL_SMP_CTX_NEW_VERSION) |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #endif |
| 28 | |
| 29 | #endif /* !(_SPARC64_PIL_H) */ |