1 #ifndef _ALPHA_HARDIRQ_H
2 #define _ALPHA_HARDIRQ_H
4 #include <linux/config.h>
5 #include <linux/threads.h>
7 /* entry.S is sensitive to the offsets of these fields */
9 unsigned int __softirq_active
;
10 unsigned int __softirq_mask
;
11 unsigned int __local_irq_count
;
12 unsigned int __local_bh_count
;
13 unsigned int __syscall_count
;
14 } ____cacheline_aligned irq_cpustat_t
;
16 #include <linux/irq_cpustat.h> /* Standard mappings for irq_cpustat_t above */
19 * Are we in an interrupt context? Either doing bottom half
20 * or hardware interrupt processing?
23 #define in_interrupt() \
25 int __cpu = smp_processor_id(); \
26 (local_irq_count(__cpu) + local_bh_count(__cpu)) != 0; \
29 #define in_irq() (local_irq_count(smp_processor_id()) != 0)
33 extern unsigned long __irq_attempt
[];
34 #define irq_attempt(cpu, irq) ((void)(cpu), __irq_attempt[irq])
36 #define hardirq_trylock(cpu) (local_irq_count(cpu) == 0)
37 #define hardirq_endlock(cpu) ((void) 0)
39 #define irq_enter(cpu, irq) (local_irq_count(cpu)++)
40 #define irq_exit(cpu, irq) (local_irq_count(cpu)--)
42 #define synchronize_irq() barrier()
46 #define irq_attempt(cpu, irq) (cpu_data[cpu].irq_attempt[irq])
48 #include <asm/atomic.h>
49 #include <linux/spinlock.h>
52 extern int global_irq_holder
;
53 extern spinlock_t global_irq_lock
;
55 static inline int irqs_running (void)
59 for (i
= 0; i
< smp_num_cpus
; i
++)
60 if (local_irq_count(i
))
65 static inline void release_irqlock(int cpu
)
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
);
74 static inline void irq_enter(int cpu
, int irq
)
76 ++local_irq_count(cpu
);
78 while (spin_is_locked(&global_irq_lock
))
82 static inline void irq_exit(int cpu
, int irq
)
84 --local_irq_count(cpu
);
87 static inline int hardirq_trylock(int cpu
)
89 return !local_irq_count(cpu
) && !spin_is_locked(&global_irq_lock
);
92 #define hardirq_endlock(cpu) do { } while (0)
94 extern void synchronize_irq(void);
96 #endif /* CONFIG_SMP */
97 #endif /* _ALPHA_HARDIRQ_H */