109 lines
2.5 KiB
C
109 lines
2.5 KiB
C
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/*
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*
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* linux/arch/cris/kernel/irq.c
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*
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* Copyright (c) 2000,2007 Axis Communications AB
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*
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* Authors: Bjorn Wesen (bjornw@axis.com)
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*
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* This file contains the code used by various IRQ handling routines:
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* asking for different IRQs should be done through these routines
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* instead of just grabbing them. Thus setups with different IRQ numbers
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* shouldn't result in any weird surprises, and installing new handlers
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* should be easier.
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*
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*/
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/*
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* IRQs are in fact implemented a bit like signal handlers for the kernel.
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* Naturally it's not a 1:1 relation, but there are similarities.
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*/
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#include <linux/module.h>
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#include <linux/ptrace.h>
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#include <linux/irq.h>
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#include <linux/kernel_stat.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/ioport.h>
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#include <linux/interrupt.h>
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#include <linux/timex.h>
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#include <linux/slab.h>
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#include <linux/random.h>
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#include <linux/init.h>
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#include <linux/seq_file.h>
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#include <linux/errno.h>
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#include <linux/spinlock.h>
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#include <asm/io.h>
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int show_interrupts(struct seq_file *p, void *v)
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{
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int i = *(loff_t *) v, j;
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struct irqaction * action;
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unsigned long flags;
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if (i == 0) {
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seq_printf(p, " ");
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for_each_online_cpu(j)
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seq_printf(p, "CPU%d ",j);
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seq_putc(p, '\n');
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}
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if (i < NR_IRQS) {
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spin_lock_irqsave(&irq_desc[i].lock, flags);
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action = irq_desc[i].action;
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if (!action)
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goto skip;
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seq_printf(p, "%3d: ",i);
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#ifndef CONFIG_SMP
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seq_printf(p, "%10u ", kstat_irqs(i));
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#else
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for_each_online_cpu(j)
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seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
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#endif
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seq_printf(p, " %14s", irq_desc[i].chip->typename);
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seq_printf(p, " %s", action->name);
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for (action=action->next; action; action = action->next)
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seq_printf(p, ", %s", action->name);
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seq_putc(p, '\n');
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skip:
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spin_unlock_irqrestore(&irq_desc[i].lock, flags);
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}
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return 0;
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}
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/* called by the assembler IRQ entry functions defined in irq.h
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* to dispatch the interrupts to registered handlers
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* interrupts are disabled upon entry - depending on if the
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* interrupt was registered with IRQF_DISABLED or not, interrupts
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* are re-enabled or not.
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*/
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asmlinkage void do_IRQ(int irq, struct pt_regs * regs)
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{
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unsigned long sp;
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struct pt_regs *old_regs = set_irq_regs(regs);
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irq_enter();
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sp = rdsp();
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if (unlikely((sp & (PAGE_SIZE - 1)) < (PAGE_SIZE/8))) {
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printk("do_IRQ: stack overflow: %lX\n", sp);
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show_stack(NULL, (unsigned long *)sp);
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}
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__do_IRQ(irq);
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irq_exit();
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set_irq_regs(old_regs);
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}
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void weird_irq(void)
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{
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local_irq_disable();
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printk("weird irq\n");
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while(1);
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}
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