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#ifdef __KERNEL__

#ifndef __ASM_HARDIRQ_H

#define __ASM_HARDIRQ_H

/*

 * Use a brlock for the global irq lock, based on sparc64.

 * Anton Blanchard <anton@au1.ibm.com>

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version

 * 2 of the License, or (at your option) any later version.

 */

#include <linux/config.h>

#include <linux/brlock.h>

#include <linux/spinlock.h>

typedef struct {

        unsigned long __softirq_pending;

#ifndef CONFIG_SMP

        unsigned int __local_irq_count;

#else

        unsigned int __unused_on_SMP;           /* We use brlocks on SMP */

#endif

        unsigned int __local_bh_count;

        unsigned int __syscall_count;

        unsigned long __unused;

        struct task_struct * __ksoftirqd_task;

} ____cacheline_aligned irq_cpustat_t;

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

/* Note that local_irq_count() is replaced by ppc64 specific version for SMP */

#ifndef CONFIG_SMP

#define irq_enter(cpu)          (local_irq_count(cpu)++)

#define irq_exit(cpu)           (local_irq_count(cpu)--)

#else

#undef local_irq_count

#define local_irq_count(cpu)    (__brlock_array[cpu][BR_GLOBALIRQ_LOCK])

#define irq_enter(cpu)          br_read_lock(BR_GLOBALIRQ_LOCK)

#define irq_exit(cpu)           br_read_unlock(BR_GLOBALIRQ_LOCK)

#endif

/*

 * 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); })

/* This tests only the local processors hw IRQ context disposition.  */

#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 synchronize_irq()       barrier()

#else /* CONFIG_SMP */

static __inline__ int irqs_running(void)

{

        int i;

        for (i = 0; i < smp_num_cpus; i++)

                if (local_irq_count(cpu_logical_map(i)))

                        return 1;

        return 0;

}

extern unsigned char global_irq_holder;

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;

                br_write_unlock(BR_GLOBALIRQ_LOCK);

        }

}

static inline int hardirq_trylock(int cpu)

{

        spinlock_t *lock = &__br_write_locks[BR_GLOBALIRQ_LOCK].lock;

        return (!local_irq_count(cpu) && !spin_is_locked(lock));

}

#define hardirq_endlock(cpu)    do { (void)(cpu); } while (0)

extern void synchronize_irq(void);

#endif /* CONFIG_SMP */

#endif /* __KERNEL__ */

#endif /* __ASM_HARDIRQ_H */