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/* hardirq.h: 32-bit Sparc hard IRQ support.
*
* Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
* Copyright (C) 1998-99 Anton Blanchard (anton@progsoc.uts.edu.au)
*/
#ifndef __SPARC_HARDIRQ_H
#define __SPARC_HARDIRQ_H
#include <linux/threads.h>
#ifndef __SMP__
extern unsigned int local_irq_count;
/*
* Are we in an interrupt context? Either doing bottom half
* or hardware interrupt processing?
*/
#define in_interrupt() ((local_irq_count + local_bh_count) != 0)
#define hardirq_trylock(cpu) (local_irq_count == 0)
#define hardirq_endlock(cpu) do { } while (0)
#define hardirq_enter(cpu) (local_irq_count++)
#define hardirq_exit(cpu) (local_irq_count--)
#define synchronize_irq() barrier()
#else
#include <asm/atomic.h>
#include <linux/spinlock.h>
#include <asm/system.h>
#include <asm/smp.h>
extern unsigned int local_irq_count[NR_CPUS];
extern unsigned char global_irq_holder;
extern spinlock_t global_irq_lock;
extern atomic_t global_irq_count;
/*
* 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); })
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;
spin_unlock(&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) &&
! spin_is_locked (&global_irq_lock));
}
#define hardirq_endlock(cpu) do { } while (0)
extern void synchronize_irq(void);
#endif /* __SMP__ */
#endif /* __SPARC_HARDIRQ_H */
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