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5f97f7f9 HS |
1 | /* |
2 | * Copyright (C) 2004-2006 Atmel Corporation | |
3 | * | |
4 | * Based on arch/i386/kernel/irq.c | |
5 | * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * This file contains the code used by various IRQ handling routines: | |
12 | * asking for different IRQ's should be done through these routines | |
13 | * instead of just grabbing them. Thus setups with different IRQ numbers | |
14 | * shouldn't result in any weird surprises, and installing new handlers | |
15 | * should be easier. | |
16 | * | |
17 | * IRQ's are in fact implemented a bit like signal handlers for the kernel. | |
18 | * Naturally it's not a 1:1 relation, but there are similarities. | |
19 | */ | |
20 | ||
21 | #include <linux/interrupt.h> | |
22 | #include <linux/irq.h> | |
23 | #include <linux/kernel_stat.h> | |
24 | #include <linux/proc_fs.h> | |
25 | #include <linux/seq_file.h> | |
26 | #include <linux/sysdev.h> | |
27 | ||
28 | /* | |
29 | * 'what should we do if we get a hw irq event on an illegal vector'. | |
30 | * each architecture has to answer this themselves. | |
31 | */ | |
32 | void ack_bad_irq(unsigned int irq) | |
33 | { | |
34 | printk("unexpected IRQ %u\n", irq); | |
35 | } | |
36 | ||
37 | #ifdef CONFIG_PROC_FS | |
38 | int show_interrupts(struct seq_file *p, void *v) | |
39 | { | |
40 | int i = *(loff_t *)v, cpu; | |
41 | struct irqaction *action; | |
42 | unsigned long flags; | |
43 | ||
44 | if (i == 0) { | |
45 | seq_puts(p, " "); | |
46 | for_each_online_cpu(cpu) | |
47 | seq_printf(p, "CPU%d ", cpu); | |
48 | seq_putc(p, '\n'); | |
49 | } | |
50 | ||
51 | if (i < NR_IRQS) { | |
52 | spin_lock_irqsave(&irq_desc[i].lock, flags); | |
53 | action = irq_desc[i].action; | |
54 | if (!action) | |
55 | goto unlock; | |
56 | ||
57 | seq_printf(p, "%3d: ", i); | |
58 | for_each_online_cpu(cpu) | |
59 | seq_printf(p, "%10u ", kstat_cpu(cpu).irqs[i]); | |
60 | seq_printf(p, " %s", action->name); | |
61 | for (action = action->next; action; action = action->next) | |
62 | seq_printf(p, ", %s", action->name); | |
63 | ||
64 | seq_putc(p, '\n'); | |
65 | unlock: | |
66 | spin_unlock_irqrestore(&irq_desc[i].lock, flags); | |
67 | } | |
68 | ||
69 | return 0; | |
70 | } | |
71 | #endif |