#ifndef _ALPHA_HARDIRQ_H #define _ALPHA_HARDIRQ_H /* Initially just a straight copy of the i386 code. */ #include <linux/tasks.h> #ifndef __SMP__ extern unsigned long local_irq_count; #else #define local_irq_count (cpu_data[smp_processor_id()].irq_count) #endif /* * Are we in an interrupt context? Either doing bottom half * or hardware interrupt processing? */ #define in_interrupt() ((local_irq_count + local_bh_count) != 0) #ifndef __SMP__ #define hardirq_trylock(cpu) (local_irq_count == 0) #define hardirq_endlock(cpu) ((void) 0) #define hardirq_enter(cpu, irq) (local_irq_count++) #define hardirq_exit(cpu, irq) (local_irq_count--) #define synchronize_irq() barrier() #else #include <asm/atomic.h> #include <asm/spinlock.h> #include <asm/smp.h> extern int global_irq_holder; extern spinlock_t 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 == cpu) { global_irq_holder = NO_PROC_ID; spin_unlock(&global_irq_lock); } } static inline void hardirq_enter(int cpu, int irq) { ++(cpu_data[cpu].irq_count); atomic_inc(&global_irq_count); } static inline void hardirq_exit(int cpu, int irq) { atomic_dec(&global_irq_count); --(cpu_data[cpu].irq_count); } static inline int hardirq_trylock(int cpu) { return ! atomic_read(&global_irq_count) && ! spin_is_locked(&global_irq_lock); } #define hardirq_endlock(cpu) ((void) 0) extern void synchronize_irq(void); #endif /* __SMP__ */ #endif /* _ALPHA_HARDIRQ_H */