1/*
2 *
3 *	linux/arch/cris/kernel/irq.c
4 *
5 *      Copyright (c) 2000,2001 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 IRQ's 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 * IRQ's 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/slab.h>
33#include <linux/random.h>
34#include <linux/init.h>
35#include <linux/seq_file.h>
36#include <linux/errno.h>
37#include <linux/spinlock.h>
38
39#include <asm/io.h>
40
41void ack_bad_irq(unsigned int irq)
42{
43	printk("unexpected IRQ trap at vector %02x\n", irq);
44}
45
46int show_interrupts(struct seq_file *p, void *v)
47{
48	int i = *(loff_t *) v, j;
49	struct irqaction * action;
50	unsigned long flags;
51
52	if (i == 0) {
53		seq_printf(p, "           ");
54		for_each_online_cpu(j)
55			seq_printf(p, "CPU%d       ",j);
56		seq_putc(p, '\n');
57	}
58
59	if (i < NR_IRQS) {
60		spin_lock_irqsave(&irq_desc[i].lock, flags);
61		action = irq_desc[i].action;
62		if (!action)
63			goto skip;
64		seq_printf(p, "%3d: ",i);
65#ifndef CONFIG_SMP
66		seq_printf(p, "%10u ", kstat_irqs(i));
67#else
68		for_each_online_cpu(j)
69			seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
70#endif
71		seq_printf(p, " %14s", irq_desc[i].chip->typename);
72		seq_printf(p, "  %s", action->name);
73
74		for (action=action->next; action; action = action->next)
75			seq_printf(p, ", %s", action->name);
76
77		seq_putc(p, '\n');
78skip:
79		spin_unlock_irqrestore(&irq_desc[i].lock, flags);
80	}
81	return 0;
82}
83
84
85/* called by the assembler IRQ entry functions defined in irq.h
86 * to dispatch the interrupts to registred handlers
87 * interrupts are disabled upon entry - depending on if the
88 * interrupt was registred with IRQF_DISABLED or not, interrupts
89 * are re-enabled or not.
90 */
91
92asmlinkage void do_IRQ(int irq, struct pt_regs * regs)
93{
94	unsigned long sp;
95	irq_enter();
96	sp = rdsp();
97	if (unlikely((sp & (PAGE_SIZE - 1)) < (PAGE_SIZE/8))) {
98		printk("do_IRQ: stack overflow: %lX\n", sp);
99		show_stack(NULL, (unsigned long *)sp);
100	}
101	__do_IRQ(irq, regs);
102        irq_exit();
103}
104
105void weird_irq(void)
106{
107	local_irq_disable();
108	printk("weird irq\n");
109	while(1);
110}
111