[mirror_ubuntu-bionic-kernel.git] / include / asm-sparc64 / pil.h

/* $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) */
Commit	Line	Data
1da177e4 LT	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	*
fd0504c3 DM	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().
1da177e4 LT	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
ee29074d	19	#define PIL_SMP_CTX_NEW_VERSION 4
fd0504c3	20	#define PIL_DEVICE_IRQ 5
1da177e4 LT	21
	22	#ifndef __ASSEMBLY__
	23	#define PIL_RESERVED(PIL) ((PIL) == PIL_SMP_CALL_FUNC \|\| \
	24	(PIL) == PIL_SMP_RECEIVE_SIGNAL \|\| \
ee29074d DM	25	(PIL) == PIL_SMP_CAPTURE \|\| \
ee29074d DM	26	(PIL) == PIL_SMP_CTX_NEW_VERSION)
1da177e4 LT	27	#endif
	28
	29	#endif /* !(_SPARC64_PIL_H) */