arch/m32r/kernel/irq.c

   1 /*
   2  * linux/arch/m32r/kernel/irq.c
   3  *
   4  *  Copyright (c) 2003, 2004  Hitoshi Yamamoto
   5  *  Copyright (c) 2004  Hirokazu Takata <takata at linux-m32r.org>
   6  */
   7
   8 /*
   9  *      linux/arch/i386/kernel/irq.c
  10  *
  11  *      Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
  12  *
  13  * This file contains the lowest level m32r-specific interrupt
  14  * entry and irq statistics code. All the remaining irq logic is
  15  * done by the generic kernel/irq/ code and in the
  16  * m32r-specific irq controller code.
  17  */
  18
  19 #include <linux/kernel_stat.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/seq_file.h>
  22 #include <linux/module.h>
  23 #include <asm/uaccess.h>
  24
  25 /*
  26  * Generic, controller-independent functions:
  27  */
  28
  29 int show_interrupts(struct seq_file *p, void *v)
  30 {
  31         int i = *(loff_t *) v, j;
  32         struct irqaction * action;
  33         unsigned long flags;
  34
  35         if (i == 0) {
  36                 seq_printf(p, "           ");
  37                 for_each_online_cpu(j)
  38                         seq_printf(p, "CPU%d       ",j);
  39                 seq_putc(p, '\n');
  40         }
  41
  42         if (i < NR_IRQS) {
  43                 struct irq_desc *desc = irq_to_desc(i);
  44
  45                 raw_spin_lock_irqsave(&desc->lock, flags);
  46                 action = desc->action;
  47                 if (!action)
  48                         goto skip;
  49                 seq_printf(p, "%3d: ",i);
  50 #ifndef CONFIG_SMP
  51                 seq_printf(p, "%10u ", kstat_irqs(i));
  52 #else
  53                 for_each_online_cpu(j)
  54                         seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
  55 #endif
  56                 seq_printf(p, " %14s", desc->irq_data.chip->name);
  57                 seq_printf(p, "  %s", action->name);
  58
  59                 for (action=action->next; action; action = action->next)
  60                         seq_printf(p, ", %s", action->name);
  61
  62                 seq_putc(p, '\n');
  63 skip:
  64                 raw_spin_unlock_irqrestore(&desc->lock, flags);
  65         }
  66         return 0;
  67 }
  68
  69 /*
  70  * do_IRQ handles all normal device IRQs (the special
  71  * SMP cross-CPU interrupts have their own specific
  72  * handlers).
  73  */
  74 asmlinkage unsigned int do_IRQ(int irq, struct pt_regs *regs)
  75 {
  76         struct pt_regs *old_regs;
  77         old_regs = set_irq_regs(regs);
  78         irq_enter();
  79
  80 #ifdef CONFIG_DEBUG_STACKOVERFLOW
  81         /* FIXME M32R */
  82 #endif
  83         generic_handle_irq(irq);
  84         irq_exit();
  85         set_irq_regs(old_regs);
  86
  87         return 1;
  88 }