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/* $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 local_irq_disable() 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 local_irq_disable().
*
* 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
#define PIL_SMP_CTX_NEW_VERSION 4
#define PIL_DEVICE_IRQ 5
#ifndef __ASSEMBLY__
#define PIL_RESERVED(PIL) ((PIL) == PIL_SMP_CALL_FUNC || \
(PIL) == PIL_SMP_RECEIVE_SIGNAL || \
(PIL) == PIL_SMP_CAPTURE || \
(PIL) == PIL_SMP_CTX_NEW_VERSION)
#endif
#endif /* !(_SPARC64_PIL_H) */
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