LXR linux/arch/cris/kernel/irq.c

   1/*
   2 *
   3 *      linux/arch/cris/kernel/irq.c
   4 *
   5 *      Copyright (c) 2000,2007 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 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
  13 * should be easier.
  14 *
  15 */
  16
  17/*
  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.
  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/random.h>
  33#include <linux/init.h>
  34#include <linux/seq_file.h>
  35#include <linux/errno.h>
  36#include <linux/spinlock.h>
  37
  38#include <asm/io.h>
  39
  40/* called by the assembler IRQ entry functions defined in irq.h
  41 * to dispatch the interrupts to registered handlers
  42 * interrupts are disabled upon entry - depending on if the
  43 * interrupt was registered with IRQF_DISABLED or not, interrupts
  44 * are re-enabled or not.
  45 */
  46
  47asmlinkage void do_IRQ(int irq, struct pt_regs * regs)
  48{
  49        unsigned long sp;
  50        struct pt_regs *old_regs = set_irq_regs(regs);
  51        irq_enter();
  52        sp = rdsp();
  53        if (unlikely((sp & (PAGE_SIZE - 1)) < (PAGE_SIZE/8))) {
  54                printk("do_IRQ: stack overflow: %lX\n", sp);
  55                show_stack(NULL, (unsigned long *)sp);
  56        }
  57        generic_handle_irq(irq);
  58        irq_exit();
  59        set_irq_regs(old_regs);
  60}
  61
  62void weird_irq(void)
  63{
  64        local_irq_disable();
  65        printk("weird irq\n");
  66        while(1);
  67}
  68
  69