irq.c

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/*
 * Copyright (C) 2007-2009 Michal Simek <[email protected]>
 * Copyright (C) 2007-2009 PetaLogix
 * Copyright (C) 2006 Atmark Techno, Inc.
 *
 * 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.
 */

#include <linux/init.h>
#include <linux/ftrace.h>
#include <linux/kernel.h>
#include <linux/hardirq.h>
#include <linux/interrupt.h>
#include <linux/irqflags.h>
#include <linux/seq_file.h>
#include <linux/kernel_stat.h>
#include <linux/irq.h>
#include <linux/of_irq.h>
#include <linux/export.h>

#include <asm/prom.h>

static u32 concurrent_irq;

void __irq_entry do_IRQ(struct pt_regs *regs)
{
    unsigned int irq;
    struct pt_regs *old_regs = set_irq_regs(regs);
    trace_hardirqs_off();

    irq_enter();
    irq = get_irq();
next_irq:
    BUG_ON(!irq);
    generic_handle_irq(irq);

    irq = get_irq();
    if (irq != -1U) {
        pr_debug("next irq: %d\n", irq);
        ++concurrent_irq;
        goto next_irq;
    }

    irq_exit();
    set_irq_regs(old_regs);
    trace_hardirqs_on();
}