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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 __PARISC_HARDIRQ_H
#define __PARISC_HARDIRQ_H
#include <linux/config.h>
#include <linux/threads.h>
typedef struct {
unsigned int __softirq_active;
unsigned int __softirq_mask;
unsigned int __local_irq_count;
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 */
/*
* 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); })
#define in_irq() ({ int __cpu = smp_processor_id(); \
(local_irq_count(__cpu) != 0); })
#ifndef CONFIG_SMP
#define hardirq_trylock(cpu) (local_irq_count(cpu) == 0)
#define hardirq_endlock(cpu) do { } while (0)
#define irq_enter(cpu, irq) (local_irq_count(cpu)++)
#define irq_exit(cpu, irq) (local_irq_count(cpu)--)
#define synchronize_irq() barrier()
#else
#include <asm/atomic.h>
#include <linux/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 irq_enter(int cpu)
{
++local_irq_count(cpu);
atomic_inc(&global_irq_count);
}
static inline void irq_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 /* CONFIG_SMP */
#endif /* __PARISC_HARDIRQ_H */
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