irq.c 2.6 KB
Newer Older
L
Linus Torvalds 已提交
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
/*
 *
 *	linux/arch/cris/kernel/irq.c
 *
 *      Copyright (c) 2000,2001 Axis Communications AB
 *
 *      Authors: Bjorn Wesen (bjornw@axis.com)
 *
 * This file contains the code used by various IRQ handling routines:
 * asking for different IRQ's should be done through these routines
 * instead of just grabbing them. Thus setups with different IRQ numbers
 * shouldn't result in any weird surprises, and installing new handlers
 * should be easier.
 *
 */

/*
 * IRQ's 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>
M
Mikael Starvik 已提交
25
#include <linux/irq.h>
L
Linus Torvalds 已提交
26 27 28 29 30 31 32 33 34 35 36 37

#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/slab.h>
#include <linux/random.h>
#include <linux/init.h>
#include <linux/seq_file.h>
#include <linux/errno.h>
M
Mikael Starvik 已提交
38
#include <linux/spinlock.h>
L
Linus Torvalds 已提交
39 40 41

#include <asm/io.h>

M
Mikael Starvik 已提交
42
void ack_bad_irq(unsigned int irq)
L
Linus Torvalds 已提交
43
{
M
Mikael Starvik 已提交
44
	printk("unexpected IRQ trap at vector %02x\n", irq);
L
Linus Torvalds 已提交
45 46 47 48
}

int show_interrupts(struct seq_file *p, void *v)
{
M
Mikael Starvik 已提交
49
	int i = *(loff_t *) v, j;
L
Linus Torvalds 已提交
50 51 52
	struct irqaction * action;
	unsigned long flags;

M
Mikael Starvik 已提交
53 54
	if (i == 0) {
		seq_printf(p, "           ");
55 56
		for_each_online_cpu(j)
			seq_printf(p, "CPU%d       ",j);
M
Mikael Starvik 已提交
57 58 59
		seq_putc(p, '\n');
	}

L
Linus Torvalds 已提交
60
	if (i < NR_IRQS) {
M
Mikael Starvik 已提交
61 62 63
		spin_lock_irqsave(&irq_desc[i].lock, flags);
		action = irq_desc[i].action;
		if (!action)
L
Linus Torvalds 已提交
64
			goto skip;
M
Mikael Starvik 已提交
65 66 67 68
		seq_printf(p, "%3d: ",i);
#ifndef CONFIG_SMP
		seq_printf(p, "%10u ", kstat_irqs(i));
#else
69 70
		for_each_online_cpu(j)
			seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
M
Mikael Starvik 已提交
71 72 73 74 75 76 77
#endif
		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);

L
Linus Torvalds 已提交
78 79
		seq_putc(p, '\n');
skip:
M
Mikael Starvik 已提交
80
		spin_unlock_irqrestore(&irq_desc[i].lock, flags);
L
Linus Torvalds 已提交
81 82 83 84
	}
	return 0;
}

M
Mikael Starvik 已提交
85

L
Linus Torvalds 已提交
86 87 88 89 90 91 92 93 94
/* called by the assembler IRQ entry functions defined in irq.h
 * to dispatch the interrupts to registred handlers
 * interrupts are disabled upon entry - depending on if the
 * interrupt was registred with SA_INTERRUPT or not, interrupts
 * are re-enabled or not.
 */

asmlinkage void do_IRQ(int irq, struct pt_regs * regs)
{
M
Mikael Starvik 已提交
95 96 97 98 99 100
	unsigned long sp;
	irq_enter();
	sp = rdsp();
	if (unlikely((sp & (PAGE_SIZE - 1)) < (PAGE_SIZE/8))) {
		printk("do_IRQ: stack overflow: %lX\n", sp);
		show_stack(NULL, (unsigned long *)sp);
L
Linus Torvalds 已提交
101
	}
M
Mikael Starvik 已提交
102 103
	__do_IRQ(irq, regs);
        irq_exit();
L
Linus Torvalds 已提交
104 105 106 107 108 109 110 111 112
}

void weird_irq(void)
{
	local_irq_disable();
	printk("weird irq\n");
	while(1);
}
新手
引导
客服 返回
顶部