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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) */