1#ifndef _ASM_IA64_HARDIRQ_H
2#define _ASM_IA64_HARDIRQ_H
3
4/*
5 * Copyright (C) 1998-2001 Hewlett-Packard Co
6 * Copyright (C) 1998-2001 David Mosberger-Tang <davidm@hpl.hp.com>
7 */
8
9#include <linux/config.h>
10
11#include <linux/threads.h>
12#include <linux/irq.h>
13
14#include <asm/processor.h>
15
16/*
17 * No irq_cpustat_t for IA-64.  The data is held in the per-CPU data structure.
18 */
19#define softirq_pending(cpu)		(cpu_data(cpu)->softirq_pending)
20#define ksoftirqd_task(cpu)		(cpu_data(cpu)->ksoftirqd)
21#define irq_count(cpu)			(cpu_data(cpu)->irq_stat.f.irq_count)
22#define bh_count(cpu)			(cpu_data(cpu)->irq_stat.f.bh_count)
23#define syscall_count(cpu)		/* unused on IA-64 */
24#define nmi_count(cpu)			0
25
26#define local_softirq_pending()		(local_cpu_data->softirq_pending)
27#define local_ksoftirqd_task()		(local_cpu_data->ksoftirqd)
28#define really_local_irq_count()	(local_cpu_data->irq_stat.f.irq_count)
29#define really_local_bh_count()		(local_cpu_data->irq_stat.f.bh_count)
30#define local_syscall_count()		/* unused on IA-64 */
31#define local_nmi_count()		0
32
33/*
34 * Are we in an interrupt context? Either doing bottom half or hardware interrupt
35 * processing?
36 */
37#define in_interrupt()			(local_cpu_data->irq_stat.irq_and_bh_counts != 0)
38#define in_irq()			(local_cpu_data->irq_stat.f.irq_count != 0)
39
40#ifndef CONFIG_SMP
41# define local_hardirq_trylock()	(really_local_irq_count() == 0)
42# define local_hardirq_endlock()	do { } while (0)
43
44# define local_irq_enter(irq)		(really_local_irq_count()++)
45# define local_irq_exit(irq)		(really_local_irq_count()--)
46
47# define synchronize_irq()		barrier()
48#else
49
50#include <asm/atomic.h>
51#include <asm/smp.h>
52
53extern unsigned int global_irq_holder;
54extern volatile unsigned long global_irq_lock;
55
56static inline int
57irqs_running (void)
58{
59	int i;
60
61	for (i = 0; i < smp_num_cpus; i++)
62		if (irq_count(i))
63			return 1;
64	return 0;
65}
66
67static inline void
68release_irqlock (int cpu)
69{
70	/* if we didn't own the irq lock, just ignore.. */
71	if (global_irq_holder == cpu) {
72		global_irq_holder = NO_PROC_ID;
73		smp_mb__before_clear_bit();	/* need barrier before releasing lock... */
74		clear_bit(0,&global_irq_lock);
75        }
76}
77
78static inline void
79local_irq_enter (int irq)
80{
81	really_local_irq_count()++;
82
83	while (test_bit(0,&global_irq_lock)) {
84		/* nothing */;
85	}
86}
87
88static inline void
89local_irq_exit (int irq)
90{
91	really_local_irq_count()--;
92}
93
94static inline int
95local_hardirq_trylock (void)
96{
97	return !really_local_irq_count() && !test_bit(0,&global_irq_lock);
98}
99
100#define local_hardirq_endlock()		do { } while (0)
101
102extern void synchronize_irq (void);
103
104#endif /* CONFIG_SMP */
105#endif /* _ASM_IA64_HARDIRQ_H */
106