blob: 54c171225b78d71e6dc131186a343cb2bfe13667 [file] [log] [blame]
/* $Id: irq.c,v 1.20 2004/01/13 05:52:11 kkojima Exp $
* linux/arch/sh/kernel/irq.c
* Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
* SuperH version: Copyright (C) 1999 Niibe Yutaka
* IRQs are in fact implemented a bit like signal handlers for the kernel.
* Naturally it's not a 1:1 relation, but there are similarities.
#include <linux/config.h>
#include <linux/module.h>
#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/kernel_stat.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/timex.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/random.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/init.h>
#include <linux/seq_file.h>
#include <linux/kallsyms.h>
#include <linux/bitops.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/pgalloc.h>
#include <asm/delay.h>
#include <asm/irq.h>
#include <linux/irq.h>
* 'what should we do if we get a hw irq event on an illegal vector'.
* each architecture has to answer this themselves, it doesn't deserve
* a generic callback i think.
void ack_bad_irq(unsigned int irq)
printk("unexpected IRQ trap at vector %02x\n", irq);
#if defined(CONFIG_PROC_FS)
int show_interrupts(struct seq_file *p, void *v)
int i = *(loff_t *) v, j;
struct irqaction * action;
unsigned long flags;
if (i == 0) {
seq_puts(p, " ");
for (j=0; j<NR_CPUS; j++)
if (cpu_online(j))
seq_printf(p, "CPU%d ",j);
seq_putc(p, '\n');
if (i < ACTUAL_NR_IRQS) {
spin_lock_irqsave(&irq_desc[i].lock, flags);
action = irq_desc[i].action;
if (!action)
goto unlock;
seq_printf(p, "%3d: ",i);
seq_printf(p, "%10u ", kstat_irqs(i));
seq_printf(p, " %14s", irq_desc[i].handler->typename);
seq_printf(p, " %s", action->name);
for (action=action->next; action; action = action->next)
seq_printf(p, ", %s", action->name);
seq_putc(p, '\n');
spin_unlock_irqrestore(&irq_desc[i].lock, flags);
return 0;
asmlinkage int do_IRQ(unsigned long r4, unsigned long r5,
unsigned long r6, unsigned long r7,
struct pt_regs regs)
int irq;
asm volatile("stc r2_bank, %0\n\t"
"shlr2 %0\n\t"
"shlr2 %0\n\t"
"shlr %0\n\t"
"add #-16, %0\n\t"
:"=z" (irq));
irq = irq_demux(irq);
__do_IRQ(irq, &regs);
return 1;