Subversion Repositories or1k

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1997 - 2000, 2001 by Ralf Baechle
 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
 * Copyright (C) 2001 MIPS Technologies, Inc.
 */
#ifndef _ASM_HARDIRQ_H
#define _ASM_HARDIRQ_H
 
#include <linux/config.h>
#include <linux/threads.h>
#include <linux/irq.h>
 
typedef struct {
	unsigned int __softirq_pending;
	unsigned int __local_irq_count;
	unsigned int __local_bh_count;
	unsigned int __syscall_count;
	struct task_struct * __ksoftirqd_task;	/* waitqueue is too large */
} ____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() (local_irq_count(smp_processor_id()) != 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/smp.h>
 
extern int global_irq_holder;
extern spinlock_t global_irq_lock;
 
static inline int irqs_running (void)
{
	int i;
 
	for (i = 0; i < smp_num_cpus; i++)
		if (local_irq_count(i))
			return 1;
	return 0;
}
 
static inline void release_irqlock(int cpu)
{
	/* if we didn't own the irq lock, just ignore.. */
	if (global_irq_holder == cpu) {
		global_irq_holder = NO_PROC_ID;
		spin_unlock(&global_irq_lock);
	}
}
 
static inline int hardirq_trylock(int cpu)
{
	return !local_irq_count(cpu) && !spin_is_locked(&global_irq_lock);
}
 
#define hardirq_endlock(cpu)	do { } while (0)
 
static inline void irq_enter(int cpu, int irq)
{
	++local_irq_count(cpu);
 
	while (spin_is_locked(&global_irq_lock))
		barrier();
}
 
static inline void irq_exit(int cpu, int irq)
{
	--local_irq_count(cpu);
}
 
extern void synchronize_irq(void);
 
#endif /* CONFIG_SMP */
 
#endif /* _ASM_HARDIRQ_H */