1#ifndef _ALPHA_HARDIRQ_H
2#define _ALPHA_HARDIRQ_H
3
4#include <linux/config.h>
5#include <linux/threads.h>
6
7/* entry.S is sensitive to the offsets of these fields */
8typedef struct {
9	unsigned long __softirq_pending;
10	unsigned int __local_irq_count;
11	unsigned int __local_bh_count;
12	unsigned int __syscall_count;
13	struct task_struct * __ksoftirqd_task;
14} ____cacheline_aligned irq_cpustat_t;
15
16#include <linux/irq_cpustat.h>	/* Standard mappings for irq_cpustat_t above */
17
18/*
19 * Are we in an interrupt context? Either doing bottom half
20 * or hardware interrupt processing?
21 */
22
23#define in_interrupt()						\
24({								\
25	int __cpu = smp_processor_id();				\
26	(local_irq_count(__cpu) + local_bh_count(__cpu)) != 0;	\
27})
28
29#define in_irq() (local_irq_count(smp_processor_id()) != 0)
30
31#ifndef CONFIG_SMP
32
33extern unsigned long __irq_attempt[];
34#define irq_attempt(cpu, irq)  ((void)(cpu), __irq_attempt[irq])
35
36#define hardirq_trylock(cpu)	(local_irq_count(cpu) == 0)
37#define hardirq_endlock(cpu)	((void) 0)
38
39#define irq_enter(cpu, irq)	(local_irq_count(cpu)++)
40#define irq_exit(cpu, irq)	(local_irq_count(cpu)--)
41
42#define synchronize_irq()	barrier()
43
44#else
45
46#define irq_attempt(cpu, irq) (cpu_data[cpu].irq_attempt[irq])
47
48#include <asm/atomic.h>
49#include <linux/spinlock.h>
50#include <asm/smp.h>
51
52extern int global_irq_holder;
53extern spinlock_t global_irq_lock;
54
55static inline int irqs_running (void)
56{
57	int i;
58
59	for (i = 0; i < smp_num_cpus; i++)
60		if (local_irq_count(i))
61			return 1;
62	return 0;
63}
64
65static inline void release_irqlock(int cpu)
66{
67	/* if we didn't own the irq lock, just ignore.. */
68	if (global_irq_holder == cpu) {
69		global_irq_holder = NO_PROC_ID;
70		spin_unlock(&global_irq_lock);
71        }
72}
73
74static inline void irq_enter(int cpu, int irq)
75{
76	++local_irq_count(cpu);
77
78	while (spin_is_locked(&global_irq_lock))
79		barrier();
80}
81
82static inline void irq_exit(int cpu, int irq)
83{
84        --local_irq_count(cpu);
85}
86
87static inline int hardirq_trylock(int cpu)
88{
89	return !local_irq_count(cpu) && !spin_is_locked(&global_irq_lock);
90}
91
92#define hardirq_endlock(cpu)	do { } while (0)
93
94extern void synchronize_irq(void);
95
96#endif /* CONFIG_SMP */
97#endif /* _ALPHA_HARDIRQ_H */
98