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/errno.h>
  19 #include <linux/kernel_stat.h>
  20 #include <linux/signal.h>
  21 #include <linux/rwsem.h>
  22 #include <linux/sched.h>
  23 #include <linux/ioport.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/timex.h>
  26 #include <linux/slab.h>
  27 #include <linux/random.h>
  28 #include <linux/smp.h>
  29 #include <linux/init.h>
  30 #include <linux/seq_file.h>
  31 #include <linux/bitops.h>
  32 #include <asm/system.h>
  33 #include <asm/io.h>
  34 #include <asm/smp.h>
  35 #include <asm/pgalloc.h>
  36 #include <asm/delay.h>
  37 #include <asm/irq.h>
  38 #include <linux/irq.h>
  39
  40 void ack_bad_irq(unsigned int irq)
  41 {
  42         printk("unexpected IRQ trap at irq %02x\n", irq);
  43 }
  44
  45 #if defined(CONFIG_PROC_FS)
  46 int show_interrupts(struct seq_file *p, void *v)
  47 {
  48         int i = *(loff_t *) v, j;
  49         struct irqaction * action;
  50         unsigned long flags;
  51
  52         if (i == 0) {
  53                 seq_puts(p, "           ");
  54                 for_each_online_cpu(j)
  55                         seq_printf(p, "CPU%d       ",j);
  56                 seq_putc(p, '\n');
  57         }
  58
  59         if (i < NR_IRQS) {
  60                 spin_lock_irqsave(&irq_desc[i].lock, flags);
  61                 action = irq_desc[i].action;
  62                 if (!action)
  63                         goto unlock;
  64                 seq_printf(p, "%3d: ",i);
  65                 seq_printf(p, "%10u ", kstat_irqs(i));
  66                 seq_printf(p, " %14s", irq_desc[i].chip->typename);
  67                 seq_printf(p, "  %s", action->name);
  68
  69                 for (action=action->next; action; action = action->next)
  70                         seq_printf(p, ", %s", action->name);
  71                 seq_putc(p, '\n');
  72 unlock:
  73                 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
  74         }
  75         return 0;
  76 }
  77 #endif
  78
  79 /*
  80  * do_NMI handles all Non-Maskable Interrupts.
  81  */
  82 asmlinkage void do_NMI(unsigned long vector_num, struct pt_regs * regs)
  83 {
  84         if (regs->sr & 0x40000000)
  85                 printk("unexpected NMI trap in system mode\n");
  86         else
  87                 printk("unexpected NMI trap in user mode\n");
  88
  89         /* No statistics */
  90 }
  91
  92 /*
  93  * do_IRQ handles all normal device IRQ's.
  94  */
  95 asmlinkage int do_IRQ(unsigned long vector_num, struct pt_regs * regs)
  96 {
  97         struct pt_regs *old_regs = set_irq_regs(regs);
  98         int irq;
  99
 100         irq_enter();
 101
 102         irq = irq_demux(vector_num);
 103
 104         if (irq >= 0) {
 105                 __do_IRQ(irq);
 106         } else {
 107                 printk("unexpected IRQ trap at vector %03lx\n", vector_num);
 108         }
 109
 110         irq_exit();
 111
 112         set_irq_regs(old_regs);
 113         return 1;
 114 }
 115