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/* hardirq.h: 64-bit Sparc hard IRQ support.
*
* Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
*/
#ifndef __SPARC64_HARDIRQ_H
#define __SPARC64_HARDIRQ_H
#include <linux/tasks.h>
#ifndef __SMP__
extern unsigned int local_irq_count;
#else
#define local_irq_count (cpu_data[smp_processor_id()].irq_count)
#endif
#define in_interrupt() (local_irq_count != 0)
#ifndef __SMP__
#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() 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;
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)
{
++cpu_data[cpu].irq_count;
atomic_inc(&global_irq_count);
membar("#StoreLoad | #StoreStore");
}
static inline void hardirq_exit(int cpu)
{
membar("#StoreStore | #LoadStore");
atomic_dec(&global_irq_count);
--cpu_data[cpu].irq_count;
}
static inline int hardirq_trylock(int cpu)
{
unsigned long flags;
__save_and_cli(flags);
atomic_inc(&global_irq_count);
if(atomic_read(&global_irq_count) != 1 ||
(*(((unsigned char *)(&global_irq_lock)))) != 0) {
atomic_dec(&global_irq_count);
__restore_flags(flags);
return 0;
}
++cpu_data[cpu].irq_count;
return 1;
}
static inline void hardirq_endlock(int cpu)
{
__cli();
hardirq_exit(cpu);
__sti();
}
extern void synchronize_irq(void);
#endif /* __SMP__ */
#endif /* !(__SPARC64_HARDIRQ_H) */
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