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                 spin_lock_irqsave(&irq_desc[i].lock, flags);
  44                 action = irq_desc[i].action;
  45                 if (!action)
  46                         goto skip;
  47                 seq_printf(p, "%3d: ",i);
  48 #ifndef CONFIG_SMP
  49                 seq_printf(p, "%10u ", kstat_irqs(i));
  50 #else
  51                 for_each_online_cpu(j)
  52                         seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
  53 #endif
  54                 seq_printf(p, " %14s", irq_desc[i].chip->typename);
  55                 seq_printf(p, "  %s", action->name);
  56
  57                 for (action=action->next; action; action = action->next)
  58                         seq_printf(p, ", %s", action->name);
  59
  60                 seq_putc(p, '\n');
  61 skip:
  62                 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
  63         }
  64         return 0;
  65 }
  66
  67 /*
  68  * do_IRQ handles all normal device IRQs (the special
  69  * SMP cross-CPU interrupts have their own specific
  70  * handlers).
  71  */
  72 asmlinkage unsigned int do_IRQ(int irq, struct pt_regs *regs)
  73 {
  74         struct pt_regs *old_regs;
  75         old_regs = set_irq_regs(regs);
  76         irq_enter();
  77
  78 #ifdef CONFIG_DEBUG_STACKOVERFLOW
  79         /* FIXME M32R */
  80 #endif
  81         __do_IRQ(irq);
  82         irq_exit();
  83         set_irq_regs(old_regs);
  84
  85         return 1;
  86 }