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
40/* called by the assembler IRQ entry functions defined in irq.h
41 * to dispatch the interrupts to registered handlers
42 * interrupts are disabled upon entry - depending on if the
43 * interrupt was registered with IRQF_DISABLED or not, interrupts
44 * are re-enabled or not.
45 */
46
47asmlinkage void do_IRQ(int irq, struct pt_regs * regs)
48{
49	unsigned long sp;
50	struct pt_regs *old_regs = set_irq_regs(regs);
51	irq_enter();
52	sp = rdsp();
53	if (unlikely((sp & (PAGE_SIZE - 1)) < (PAGE_SIZE/8))) {
54		printk("do_IRQ: stack overflow: %lX\n", sp);
55		show_stack(NULL, (unsigned long *)sp);
56	}
57	generic_handle_irq(irq);
58	irq_exit();
59	set_irq_regs(old_regs);
60}
61
62void weird_irq(void)
63{
64	local_irq_disable();
65	printk("weird irq\n");
66	while(1);
67}
68