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   1 /* $Id: irq.c,v 1.20 2004/01/13 05:52:11 kkojima Exp $
   2  *
   3  * linux/arch/sh/kernel/irq.c
   4  *
   5  *      Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
   6  *
   7  *
   8  * SuperH version:  Copyright (C) 1999  Niibe Yutaka
   9  */
  10
  11 #include <linux/irq.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/kernel_stat.h>
  14 #include <linux/seq_file.h>
  15 #include <asm/irq.h>
  16 #include <asm/processor.h>
  17 #include <asm/cpu/mmu_context.h>
  18
  19 /*
  20  * 'what should we do if we get a hw irq event on an illegal vector'.
  21  * each architecture has to answer this themselves, it doesn't deserve
  22  * a generic callback i think.
  23  */
  24 void ack_bad_irq(unsigned int irq)
  25 {
  26         printk("unexpected IRQ trap at vector %02x\n", irq);
  27 }
  28
  29 #if defined(CONFIG_PROC_FS)
  30 int show_interrupts(struct seq_file *p, void *v)
  31 {
  32         int i = *(loff_t *) v, j;
  33         struct irqaction * action;
  34         unsigned long flags;
  35
  36         if (i == 0) {
  37                 seq_puts(p, "           ");
  38                 for_each_online_cpu(j)
  39                         seq_printf(p, "CPU%d       ",j);
  40                 seq_putc(p, '\n');
  41         }
  42
  43         if (i < NR_IRQS) {
  44                 spin_lock_irqsave(&irq_desc[i].lock, flags);
  45                 action = irq_desc[i].action;
  46                 if (!action)
  47                         goto unlock;
  48                 seq_printf(p, "%3d: ",i);
  49                 seq_printf(p, "%10u ", kstat_irqs(i));
  50                 seq_printf(p, " %14s", irq_desc[i].chip->typename);
  51                 seq_printf(p, "  %s", action->name);
  52
  53                 for (action=action->next; action; action = action->next)
  54                         seq_printf(p, ", %s", action->name);
  55                 seq_putc(p, '\n');
  56 unlock:
  57                 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
  58         }
  59         return 0;
  60 }
  61 #endif
  62
  63
  64 asmlinkage int do_IRQ(unsigned long r4, unsigned long r5,
  65                       unsigned long r6, unsigned long r7,
  66                       struct pt_regs regs)
  67 {
  68         int irq = r4;
  69
  70         irq_enter();
  71
  72 #ifdef CONFIG_CPU_HAS_INTEVT
  73         __asm__ __volatile__ (
  74 #ifdef CONFIG_CPU_HAS_SR_RB
  75                 "stc    r2_bank, %0\n\t"
  76 #else
  77                 "mov.l  @%1, %0\n\t"
  78 #endif
  79                 "shlr2  %0\n\t"
  80                 "shlr2  %0\n\t"
  81                 "shlr   %0\n\t"
  82                 "add    #-16, %0\n\t"
  83                 : "=z" (irq), "=r" (r4)
  84                 : "1" (INTEVT)
  85                 : "memory"
  86         );
  87 #endif
  88
  89         irq = irq_demux(irq);
  90         __do_IRQ(irq, &regs);
  91         irq_exit();
  92         return 1;
  93 }