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#ifdef __KERNEL__

#ifndef __ASM_HARDIRQ_H

#define __ASM_HARDIRQ_H

#include <linux/config.h>

#include <asm/smp.h>

/* entry.S is sensitive to the offsets of these fields */

/* The __last_jiffy_stamp field is needed to ensure that no decrementer

 * interrupt is lost on SMP machines. Since on most CPUs it is in the same

 * cache line as local_irq_count, it is cheap to access and is also used on UP

 * for uniformity.

 */

typedef struct {

        unsigned long __softirq_pending;        /* set_bit is used on this */

        unsigned int __local_irq_count;

        unsigned int __local_bh_count;

        unsigned int __syscall_count;

        struct task_struct * __ksoftirqd_task;

        unsigned int __last_jiffy_stamp;

        unsigned int __heartbeat_count;

        unsigned int __heartbeat_reset;

} ____cacheline_aligned irq_cpustat_t;

#include <linux/irq_cpustat.h>  /* Standard mappings for irq_cpustat_t above */

#define last_jiffy_stamp(cpu) __IRQ_STAT((cpu), __last_jiffy_stamp)

#define heartbeat_count(cpu) __IRQ_STAT((cpu), __heartbeat_count)

#define heartbeat_reset(cpu) __IRQ_STAT((cpu), __heartbeat_reset)

/*

 * 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 CONFIG_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 /* CONFIG_SMP */

#include <asm/atomic.h>

extern unsigned char global_irq_holder;

extern unsigned volatile long 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)

{

        unsigned int loops = 10000000;

        ++local_irq_count(cpu);

        atomic_inc(&global_irq_count);

        while (test_bit(0,&global_irq_lock)) {

                if (cpu == global_irq_holder) {

                        printk("uh oh, interrupt while we hold global irq lock! (CPU %d)\n", cpu);

#ifdef CONFIG_XMON

                        xmon(0);

#endif

                        break;

                }

                if (loops-- == 0) {

                        printk("do_IRQ waiting for irq lock (holder=%d)\n", global_irq_holder);

#ifdef CONFIG_XMON

                        xmon(0);

#endif

                }

        }

}

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 /* CONFIG_SMP */

#endif /* __ASM_HARDIRQ_H */

#endif /* __KERNEL__ */