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- #ifndef __ASM_HARDIRQ_H
- #define __ASM_HARDIRQ_H
-
- extern unsigned int local_irq_count[NR_CPUS];
-
- /*
- * Are we in an interrupt context? Either doing bottom half
- * or hardware interrupt processing?
- */
- #define in_interrupt() ({ int __cpu = smp_processor_id(); \
- (local_irq_count[__cpu] + local_bh_count[__cpu] != 0); })
-
- #ifndef __SMP__
-
- #define hardirq_trylock(cpu) (local_irq_count[cpu] == 0)
- #define hardirq_endlock(cpu) do { } while (0)
-
- #define hardirq_enter(cpu) (local_irq_count[cpu]++)
- #define hardirq_exit(cpu) (local_irq_count[cpu]--)
-
- #define synchronize_irq() do { } while (0)
-
- #else /* __SMP__ */
-
- #include <asm/atomic.h>
-
- extern unsigned char global_irq_holder;
- extern unsigned volatile int global_irq_lock;
- extern atomic_t global_irq_count;
-
- static inline void release_irqlock(int cpu)
- {
- /* if we didn't own the irq lock, just ignore.. */
- if (global_irq_holder == (unsigned char) cpu) {
- global_irq_holder = NO_PROC_ID;
- clear_bit(0,&global_irq_lock);
- }
- }
-
- static inline void hardirq_enter(int cpu)
- {
- ++local_irq_count[cpu];
- atomic_inc(&global_irq_count);
- }
-
- static inline void hardirq_exit(int cpu)
- {
- atomic_dec(&global_irq_count);
- --local_irq_count[cpu];
- }
-
- static inline int hardirq_trylock(int cpu)
- {
- return !atomic_read(&global_irq_count) && !test_bit(0,&global_irq_lock);
- }
-
- #define hardirq_endlock(cpu) do { } while (0)
-
- extern void synchronize_irq(void);
-
- #endif /* __SMP__ */
-
- #endif /* __ASM_HARDIRQ_H */
-