3 * linux/arch/cris/kernel/irq.c
5 * Copyright (c) 2000,2007 Axis Communications AB
7 * Authors: Bjorn Wesen (bjornw@axis.com)
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
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.
22 #include <linux/module.h>
23 #include <linux/ptrace.h>
24 #include <linux/irq.h>
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>
40 int show_interrupts(struct seq_file *p, void *v)
42 int i = *(loff_t *) v, j;
43 struct irqaction * action;
48 for_each_online_cpu(j)
49 seq_printf(p, "CPU%d ",j);
54 raw_spin_lock_irqsave(&irq_desc[i].lock, flags);
55 action = irq_desc[i].action;
58 seq_printf(p, "%3d: ",i);
60 seq_printf(p, "%10u ", kstat_irqs(i));
62 for_each_online_cpu(j)
63 seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
65 seq_printf(p, " %14s", irq_desc[i].chip->name);
66 seq_printf(p, " %s", action->name);
68 for (action=action->next; action; action = action->next)
69 seq_printf(p, ", %s", action->name);
73 raw_spin_unlock_irqrestore(&irq_desc[i].lock, flags);
79 /* called by the assembler IRQ entry functions defined in irq.h
80 * to dispatch the interrupts to registered handlers
81 * interrupts are disabled upon entry - depending on if the
82 * interrupt was registered with IRQF_DISABLED or not, interrupts
83 * are re-enabled or not.
86 asmlinkage void do_IRQ(int irq, struct pt_regs * regs)
89 struct pt_regs *old_regs = set_irq_regs(regs);
92 if (unlikely((sp & (PAGE_SIZE - 1)) < (PAGE_SIZE/8))) {
93 printk("do_IRQ: stack overflow: %lX\n", sp);
94 show_stack(NULL, (unsigned long *)sp);
98 set_irq_regs(old_regs);
104 printk("weird irq\n");