1/*
2 *
3 *	linux/arch/cris/kernel/irq.c
4 *
5 *      Copyright (c) 2000,2007 Axis Communications AB
6 *
7 *      Authors: Bjorn Wesen (bjornw@axis.com)
8 *
9 * This file contains the code used by various IRQ handling routines:
10 * asking for different IRQs should be done through these routines
11 * instead of just grabbing them. Thus setups with different IRQ numbers
12 * shouldn't result in any weird surprises, and installing new handlers
13 * should be easier.
14 *
15 */
16
17/*
18 * IRQs are in fact implemented a bit like signal handlers for the kernel.
19 * Naturally it's not a 1:1 relation, but there are similarities.
20 */
21
22#include <linux/module.h>
23#include <linux/ptrace.h>
24#include <linux/irq.h>
25
26#include <linux/kernel_stat.h>
27#include <linux/signal.h>
28#include <linux/sched.h>
29#include <linux/ioport.h>
30#include <linux/interrupt.h>
31#include <linux/timex.h>
32#include <linux/random.h>
33#include <linux/init.h>
34#include <linux/seq_file.h>
35#include <linux/errno.h>
36#include <linux/spinlock.h>
37
38#include <asm/io.h>
39#include <arch/system.h>
40
41/* called by the assembler IRQ entry functions defined in irq.h
42 * to dispatch the interrupts to registered handlers
43 */
44
45asmlinkage void do_IRQ(int irq, struct pt_regs * regs)
46{
47	unsigned long sp;
48	struct pt_regs *old_regs;
49
50	trace_hardirqs_off();
51
52	old_regs = set_irq_regs(regs);
53	irq_enter();
54	sp = rdsp();
55	if (unlikely((sp & (PAGE_SIZE - 1)) < (PAGE_SIZE/8))) {
56		printk("do_IRQ: stack overflow: %lX\n", sp);
57		show_stack(NULL, (unsigned long *)sp);
58	}
59	generic_handle_irq(irq);
60	irq_exit();
61	set_irq_regs(old_regs);
62}
63
64void weird_irq(void)
65{
66	local_irq_disable();
67	printk("weird irq\n");
68	while(1);
69}
70
71