arch/sh64/kernel/irq.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * arch/sh64/kernel/irq.c
   7  *
   8  * Copyright (C) 2000, 2001  Paolo Alberelli
   9  * Copyright (C) 2003  Paul Mundt
  10  *
  11  */
  12
  13 /*
  14  * IRQs are in fact implemented a bit like signal handlers for the kernel.
  15  * Naturally it's not a 1:1 relation, but there are similarities.
  16  */
  17
  18 #include <linux/config.h>
  19 #include <linux/errno.h>
  20 #include <linux/kernel_stat.h>
  21 #include <linux/signal.h>
  22 #include <linux/rwsem.h>
  23 #include <linux/sched.h>
  24 #include <linux/ioport.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/timex.h>
  27 #include <linux/slab.h>
  28 #include <linux/random.h>
  29 #include <linux/smp.h>
  30 #include <linux/smp_lock.h>
  31 #include <linux/init.h>
  32 #include <linux/seq_file.h>
  33 #include <linux/bitops.h>
  34 #include <asm/system.h>
  35 #include <asm/io.h>
  36 #include <asm/smp.h>
  37 #include <asm/pgalloc.h>
  38 #include <asm/delay.h>
  39 #include <asm/irq.h>
  40 #include <linux/irq.h>
  41
  42 void ack_bad_irq(unsigned int irq)
  43 {
  44         printk("unexpected IRQ trap at irq %02x\n", irq);
  45 }
  46
  47 #if defined(CONFIG_PROC_FS)
  48 int show_interrupts(struct seq_file *p, void *v)
  49 {
  50         int i = *(loff_t *) v, j;
  51         struct irqaction * action;
  52         unsigned long flags;
  53
  54         if (i == 0) {
  55                 seq_puts(p, "           ");
  56                 for (j=0; j<NR_CPUS; j++)
  57                         if (cpu_online(j))
  58                                 seq_printf(p, "CPU%d       ",j);
  59                 seq_putc(p, '\n');
  60         }
  61
  62         if (i < NR_IRQS) {
  63                 spin_lock_irqsave(&irq_desc[i].lock, flags);
  64                 action = irq_desc[i].action;
  65                 if (!action)
  66                         goto unlock;
  67                 seq_printf(p, "%3d: ",i);
  68                 seq_printf(p, "%10u ", kstat_irqs(i));
  69                 seq_printf(p, " %14s", irq_desc[i].handler->typename);
  70                 seq_printf(p, "  %s", action->name);
  71
  72                 for (action=action->next; action; action = action->next)
  73                         seq_printf(p, ", %s", action->name);
  74                 seq_putc(p, '\n');
  75 unlock:
  76                 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
  77         }
  78         return 0;
  79 }
  80 #endif
  81
  82 /*
  83  * do_NMI handles all Non-Maskable Interrupts.
  84  */
  85 asmlinkage void do_NMI(unsigned long vector_num, struct pt_regs * regs)
  86 {
  87         if (regs->sr & 0x40000000)
  88                 printk("unexpected NMI trap in system mode\n");
  89         else
  90                 printk("unexpected NMI trap in user mode\n");
  91
  92         /* No statistics */
  93 }
  94
  95 /*
  96  * do_IRQ handles all normal device IRQ's.
  97  */
  98 asmlinkage int do_IRQ(unsigned long vector_num, struct pt_regs * regs)
  99 {
 100         int irq;
 101
 102         irq_enter();
 103
 104         irq = irq_demux(vector_num);
 105
 106         if (irq >= 0) {
 107                 __do_IRQ(irq, regs);
 108         } else {
 109                 printk("unexpected IRQ trap at vector %03lx\n", vector_num);
 110         }
 111
 112         irq_exit();
 113
 114         return 1;
 115 }
 116