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#ifndef __ASM_HARDIRQ_H
#define __ASM_HARDIRQ_H
#include <linux/threads.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); })
#define in_irq() (local_irq_count[smp_processor_id()] != 0)
#ifndef __SMP__
#define hardirq_trylock(cpu) (local_irq_count[cpu] == 0)
#define hardirq_endlock(cpu) do { } while (0)
#define irq_enter(cpu, irq) (local_irq_count[cpu]++)
#define irq_exit(cpu, irq) (local_irq_count[cpu]--)
#define synchronize_irq() barrier()
#else
#include <asm/atomic.h>
#include <asm/smp.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 irq_enter(int cpu, int irq)
{
++local_irq_count[cpu];
atomic_inc(&global_irq_count);
while (test_bit(0,&global_irq_lock)) {
/* nothing */;
}
}
static inline void irq_exit(int cpu, int irq)
{
atomic_dec(&global_irq_count);
--local_irq_count[cpu];
}
static inline int hardirq_trylock(int cpu)
{
return !local_irq_count[cpu] && !test_bit(0,&global_irq_lock);
}
#define hardirq_endlock(cpu) do { } while (0)
extern void synchronize_irq(void);
#endif /* __SMP__ */
#endif /* __ASM_HARDIRQ_H */
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