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/* hardirq.h: 32-bit Sparc hard IRQ support.
*
* Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
*/
#ifndef __SPARC_HARDIRQ_H
#define __SPARC_HARDIRQ_H
#include <linux/tasks.h>
extern unsigned int local_irq_count[NR_CPUS];
#define in_interrupt() (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 hardirq_enter(cpu) (local_irq_count[cpu]++)
#define hardirq_exit(cpu) (local_irq_count[cpu]--)
#define synchronize_irq() do { } while(0)
#else /* __SMP__ */
#include <asm/atomic.h>
#include <asm/spinlock.h>
#include <asm/system.h>
#include <asm/smp.h>
extern unsigned char global_irq_holder;
extern spinlock_t global_irq_lock;
extern atomic_t global_irq_count;
#define release_irqlock(cpu) \
do { if(global_irq_holder == (unsigned char) cpu) { \
global_irq_holder = NO_PROC_ID; \
spin_unlock(&global_irq_lock); \
} \
} while(0)
/* Ordering of the counter bumps is _deadly_ important. */
#define hardirq_enter(cpu) \
do { ++local_irq_count[cpu]; atomic_inc(&global_irq_count); } while(0)
#define hardirq_exit(cpu) \
do { atomic_dec(&global_irq_count); --local_irq_count[cpu]; } while(0)
#define hardirq_trylock(cpu) \
({ unsigned long flags; int ret = 1; \
__save_flags(flags); \
__cli(); \
if(atomic_add_return(1, &global_irq_count) != 1 || \
*(((unsigned char *)(&global_irq_lock)))) { \
atomic_dec(&global_irq_count); \
__restore_flags(flags); \
ret = 0; \
} else { \
++local_irq_count[cpu]; \
__sti(); \
} \
ret; \
})
#define hardirq_endlock(cpu) do { __cli(); hardirq_exit(cpu); __sti(); } while(0)
extern void synchronize_irq(void);
#endif /* __SMP__ */
#endif /* __SPARC_HARDIRQ_H */
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