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/* hardirq.h: 32-bit Sparc hard IRQ support.
*
* Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
* Copyright (C) 1998-2000 Anton Blanchard (anton@linuxcare.com)
*/
#ifndef __SPARC_HARDIRQ_H
#define __SPARC_HARDIRQ_H
#include <linux/config.h>
#include <linux/threads.h>
#include <linux/brlock.h>
#include <linux/spinlock.h>
/* entry.S is sensitive to the offsets of these fields */
typedef struct {
unsigned int __softirq_active;
unsigned int __softirq_mask;
#ifndef CONFIG_SMP
unsigned int __local_irq_count;
#else
unsigned int __unused_on_SMP; /* DaveM says use brlock for SMP irq. KAO */
#endif
unsigned int __local_bh_count;
unsigned int __syscall_count;
} ____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 sparc64 specific version for SMP */
#ifndef CONFIG_SMP
#define irq_enter(cpu, irq) ((void)(irq), local_irq_count(cpu)++)
#define irq_exit(cpu, irq) ((void)(irq), local_irq_count(cpu)--)
#else
#undef local_irq_count
#define local_irq_count(cpu) (__brlock_array[cpu][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?
*/
#define in_interrupt() ((local_irq_count(smp_processor_id()) + \
local_bh_count(smp_processor_id())) != 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) ((void)(cpu), local_irq_count(smp_processor_id()) == 0)
#define hardirq_endlock(cpu) do { (void)(cpu); } 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 /* __SPARC_HARDIRQ_H */
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