3 * linux/arch/cris/kernel/irq.c
5 * Copyright (c) 2000,2001 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 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
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.
22 #include <linux/config.h>
23 #include <linux/module.h>
24 #include <linux/ptrace.h>
25 #include <linux/irq.h>
27 #include <linux/kernel_stat.h>
28 #include <linux/signal.h>
29 #include <linux/sched.h>
30 #include <linux/ioport.h>
31 #include <linux/interrupt.h>
32 #include <linux/timex.h>
33 #include <linux/slab.h>
34 #include <linux/random.h>
35 #include <linux/init.h>
36 #include <linux/seq_file.h>
37 #include <linux/errno.h>
38 #include <linux/spinlock.h>
42 void ack_bad_irq(unsigned int irq)
44 printk("unexpected IRQ trap at vector %02x\n", irq);
47 int show_interrupts(struct seq_file *p, void *v)
49 int i = *(loff_t *) v, j;
50 struct irqaction * action;
55 for (j=0; j<NR_CPUS; j++)
57 seq_printf(p, "CPU%d ",j);
62 spin_lock_irqsave(&irq_desc[i].lock, flags);
63 action = irq_desc[i].action;
66 seq_printf(p, "%3d: ",i);
68 seq_printf(p, "%10u ", kstat_irqs(i));
70 for (j = 0; j < NR_CPUS; j++)
72 seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
74 seq_printf(p, " %14s", irq_desc[i].handler->typename);
75 seq_printf(p, " %s", action->name);
77 for (action=action->next; action; action = action->next)
78 seq_printf(p, ", %s", action->name);
82 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
88 /* called by the assembler IRQ entry functions defined in irq.h
89 * to dispatch the interrupts to registred handlers
90 * interrupts are disabled upon entry - depending on if the
91 * interrupt was registred with SA_INTERRUPT or not, interrupts
92 * are re-enabled or not.
95 asmlinkage void do_IRQ(int irq, struct pt_regs * regs)
100 if (unlikely((sp & (PAGE_SIZE - 1)) < (PAGE_SIZE/8))) {
101 printk("do_IRQ: stack overflow: %lX\n", sp);
102 show_stack(NULL, (unsigned long *)sp);
111 printk("weird irq\n");