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/* hardirq.h: 64-bit Sparc hard IRQ support.
*
* Copyright (C) 1997, 1998 David S. Miller (davem@caip.rutgers.edu)
*/
#ifndef __SPARC64_HARDIRQ_H
#define __SPARC64_HARDIRQ_H
#include <linux/config.h>
#include <linux/threads.h>
#include <linux/brlock.h>
#include <linux/spinlock.h>
#ifndef CONFIG_SMP
extern unsigned int local_irq_count;
#define irq_enter(cpu, irq) (local_irq_count++)
#define irq_exit(cpu, irq) (local_irq_count--)
#else
#define local_irq_count (__brlock_array[smp_processor_id()][BR_GLOBALIRQ_LOCK])
#define irq_enter(cpu, irq) br_read_lock(BR_GLOBALIRQ_LOCK)
#define irq_exit(cpu, irq) br_read_unlock(BR_GLOBALIRQ_LOCK)
#endif
/*
* Are we in an interrupt context? Either doing bottom half
* or hardware interrupt processing? On any cpu?
*/
#define in_interrupt() ((local_irq_count + local_bh_count) != 0)
/* This tests only the local processors hw IRQ context disposition. */
#define in_irq() (local_irq_count != 0)
#ifndef CONFIG_SMP
#define hardirq_trylock(cpu) ((void)(cpu), local_irq_count == 0)
#define hardirq_endlock(cpu) do { (void)(cpu); } while(0)
#define hardirq_enter(cpu) ((void)(cpu), local_irq_count++)
#define hardirq_exit(cpu) ((void)(cpu), local_irq_count--)
#define synchronize_irq() barrier()
#else /* (CONFIG_SMP) */
static __inline__ int irqs_running(void)
{
enum brlock_indices idx = BR_GLOBALIRQ_LOCK;
int i, count = 0;
for (i = 0; i < smp_num_cpus; i++)
count += (__brlock_array[cpu_logical_map(i)][idx] != 0);
return count;
}
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 (!irqs_running() && !spin_is_locked(lock));
}
#define hardirq_endlock(cpu) do { (void)(cpu); } while (0)
extern void synchronize_irq(void);
#endif /* CONFIG_SMP */
#endif /* !(__SPARC64_HARDIRQ_H) */
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