1. 根目录:
2. arch
3. arm
4. include
5. asm
6. mach
7. irq.h

/*
 *  arch/arm/include/asm/mach/irq.h
 *
 *  Copyright (C) 1995-2000 Russell King.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#ifndef __ASM_ARM_MACH_IRQ_H
#define __ASM_ARM_MACH_IRQ_H

#include <linux/irq.h>

struct seq_file;

/*
 * This is internal.  Do not use it.
 */
extern void init_FIQ(void);
extern int show_fiq_list(struct seq_file *, int);

#ifdef CONFIG_MULTI_IRQ_HANDLER
extern void (*handle_arch_irq)(struct pt_regs *);
#endif

/*
 * This is for easy migration, but should be changed in the source
 */
#define do_bad_IRQ(irq,desc)				\
do {							\
	raw_spin_lock(&desc->lock);			\
	handle_bad_irq(irq, desc);			\
	raw_spin_unlock(&desc->lock);			\
} while(0)

#ifndef __ASSEMBLY__
/*
 * Entry/exit functions for chained handlers where the primary IRQ chip
 * may implement either fasteoi or level-trigger flow control.
 */
static inline void chained_irq_enter(struct irq_chip *chip,
				     struct irq_desc *desc)
{
	/* FastEOI controllers require no action on entry. */
	if (chip->irq_eoi)
		return;

	if (chip->irq_mask_ack) {
		chip->irq_mask_ack(&desc->irq_data);
	} else {
		chip->irq_mask(&desc->irq_data);
		if (chip->irq_ack)
			chip->irq_ack(&desc->irq_data);
	}
}

static inline void chained_irq_exit(struct irq_chip *chip,
				    struct irq_desc *desc)
{
	if (chip->irq_eoi)
		chip->irq_eoi(&desc->irq_data);
	else
		chip->irq_unmask(&desc->irq_data);
}
#endif

#endif