hardirq.h 3.08 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1 2 3 4
#ifndef _ASM_IA64_HARDIRQ_H
#define _ASM_IA64_HARDIRQ_H

/*
5 6
 * Copyright (C) 1998-2002 Hewlett-Packard Co
 *	David Mosberger-Tang <davidm@hpl.hp.com>
Linus Torvalds's avatar
Linus Torvalds committed
7 8 9 10 11 12 13
 */

#include <linux/config.h>

#include <linux/threads.h>
#include <linux/irq.h>

Linus Torvalds's avatar
Linus Torvalds committed
14
#include <asm/processor.h>
Linus Torvalds's avatar
Linus Torvalds committed
15 16

/*
Linus Torvalds's avatar
Linus Torvalds committed
17
 * No irq_cpustat_t for IA-64.  The data is held in the per-CPU data structure.
Linus Torvalds's avatar
Linus Torvalds committed
18
 */
Linus Torvalds's avatar
Linus Torvalds committed
19
#define softirq_pending(cpu)		(cpu_data(cpu)->softirq_pending)
Linus Torvalds's avatar
Linus Torvalds committed
20
#define syscall_count(cpu)		/* unused on IA-64 */
21
#define ksoftirqd_task(cpu)		(cpu_data(cpu)->ksoftirqd)
Linus Torvalds's avatar
Linus Torvalds committed
22 23
#define nmi_count(cpu)			0

Linus Torvalds's avatar
Linus Torvalds committed
24
#define local_softirq_pending()		(local_cpu_data->softirq_pending)
Linus Torvalds's avatar
Linus Torvalds committed
25
#define local_syscall_count()		/* unused on IA-64 */
26
#define local_ksoftirqd_task()		(local_cpu_data->ksoftirqd)
Linus Torvalds's avatar
Linus Torvalds committed
27
#define local_nmi_count()		0
Linus Torvalds's avatar
Linus Torvalds committed
28

Linus Torvalds's avatar
Linus Torvalds committed
29
/*
30 31 32 33 34 35 36 37 38 39 40 41
 * We put the hardirq and softirq counter into the preemption counter. The bitmask has the
 * following meaning:
 *
 * - bits 0-7 are the preemption count (max preemption depth: 256)
 * - bits 8-15 are the softirq count (max # of softirqs: 256)
 * - bits 16-31 are the hardirq count (max # of hardirqs: 65536)
 *
 * - (bit 63 is the PREEMPT_ACTIVE flag---not currently implemented.)
 *
 * PREEMPT_MASK: 0x000000ff
 * SOFTIRQ_MASK: 0x0000ff00
 * HARDIRQ_MASK: 0xffff0000
Linus Torvalds's avatar
Linus Torvalds committed
42
 */
Linus Torvalds's avatar
Linus Torvalds committed
43

44 45 46
#define PREEMPT_BITS	8
#define SOFTIRQ_BITS	8
#define HARDIRQ_BITS	16
Linus Torvalds's avatar
Linus Torvalds committed
47

48 49 50
#define PREEMPT_SHIFT	0
#define SOFTIRQ_SHIFT	(PREEMPT_SHIFT + PREEMPT_BITS)
#define HARDIRQ_SHIFT	(SOFTIRQ_SHIFT + SOFTIRQ_BITS)
Linus Torvalds's avatar
Linus Torvalds committed
51

52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72
#define __MASK(x)	((1UL << (x))-1)

#define PREEMPT_MASK	(__MASK(PREEMPT_BITS) << PREEMPT_SHIFT)
#define HARDIRQ_MASK	(__MASK(HARDIRQ_BITS) << HARDIRQ_SHIFT)
#define SOFTIRQ_MASK	(__MASK(SOFTIRQ_BITS) << SOFTIRQ_SHIFT)

#define hardirq_count()	(preempt_count() & HARDIRQ_MASK)
#define softirq_count()	(preempt_count() & SOFTIRQ_MASK)
#define irq_count()	(preempt_count() & (HARDIRQ_MASK | SOFTIRQ_MASK))

#define PREEMPT_OFFSET	(1UL << PREEMPT_SHIFT)
#define SOFTIRQ_OFFSET	(1UL << SOFTIRQ_SHIFT)
#define HARDIRQ_OFFSET	(1UL << HARDIRQ_SHIFT)

/*
 * The hardirq mask has to be large enough to have space for potentially all IRQ sources
 * in the system nesting on a single CPU:
 */
#if (1 << HARDIRQ_BITS) < NR_IRQS
# error HARDIRQ_BITS is too low!
#endif
Linus Torvalds's avatar
Linus Torvalds committed
73

74 75 76 77 78 79 80 81 82 83 84 85
/*
 * Are we doing bottom half or hardware interrupt processing?
 * Are we in a softirq context?
 * Interrupt context?
 */
#define in_irq()		(hardirq_count())
#define in_softirq()		(softirq_count())
#define in_interrupt()		(irq_count())

#define hardirq_trylock()	(!in_interrupt())
#define hardirq_endlock()	do { } while (0)

86
#define in_atomic()		(preempt_count() != 0)
87
#define irq_enter()		(preempt_count() += HARDIRQ_OFFSET)
Linus Torvalds's avatar
Linus Torvalds committed
88

89 90 91 92 93 94 95
#if CONFIG_PREEMPT
# error CONFIG_PREEMT currently not supported.
# define IRQ_EXIT_OFFSET (HARDIRQ_OFFSET-1)
#else
# define IRQ_EXIT_OFFSET HARDIRQ_OFFSET
#endif

96 97 98 99 100 101
#define irq_exit()						\
do {								\
		preempt_count() -= IRQ_EXIT_OFFSET;		\
		if (!in_interrupt() && local_softirq_pending())	\
			do_softirq();				\
		preempt_enable_no_resched();			\
102 103 104 105 106 107
} while (0)

#ifdef CONFIG_SMP
  extern void synchronize_irq (unsigned int irq);
#else
# define synchronize_irq(irq)	barrier()
Linus Torvalds's avatar
Linus Torvalds committed
108
#endif /* CONFIG_SMP */
109

Linus Torvalds's avatar
Linus Torvalds committed
110
#endif /* _ASM_IA64_HARDIRQ_H */