156 lines
3.3 KiB
C
156 lines
3.3 KiB
C
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Code to handle x86 style IRQs plus some generic interrupt stuff.
|
|
*
|
|
* Copyright (C) 1992 Linus Torvalds
|
|
* Copyright (C) 1994 - 2000 Ralf Baechle
|
|
*/
|
|
#include <linux/config.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/kernel_stat.h>
|
|
#include <linux/module.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/random.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/kallsyms.h>
|
|
|
|
#include <asm/atomic.h>
|
|
#include <asm/system.h>
|
|
#include <asm/uaccess.h>
|
|
|
|
/*
|
|
* 'what should we do if we get a hw irq event on an illegal vector'.
|
|
* each architecture has to answer this themselves.
|
|
*/
|
|
void ack_bad_irq(unsigned int irq)
|
|
{
|
|
printk("unexpected IRQ # %d\n", irq);
|
|
}
|
|
|
|
atomic_t irq_err_count;
|
|
|
|
#ifdef CONFIG_MIPS_MT_SMTC
|
|
/*
|
|
* SMTC Kernel needs to manipulate low-level CPU interrupt mask
|
|
* in do_IRQ. These are passed in setup_irq_smtc() and stored
|
|
* in this table.
|
|
*/
|
|
unsigned long irq_hwmask[NR_IRQS];
|
|
#endif /* CONFIG_MIPS_MT_SMTC */
|
|
|
|
#undef do_IRQ
|
|
|
|
/*
|
|
* do_IRQ handles all normal device IRQ's (the special
|
|
* SMP cross-CPU interrupts have their own specific
|
|
* handlers).
|
|
*/
|
|
asmlinkage unsigned int do_IRQ(unsigned int irq, struct pt_regs *regs)
|
|
{
|
|
irq_enter();
|
|
|
|
__DO_IRQ_SMTC_HOOK();
|
|
__do_IRQ(irq, regs);
|
|
|
|
irq_exit();
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Generic, controller-independent functions:
|
|
*/
|
|
|
|
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_printf(p, " ");
|
|
for_each_online_cpu(j)
|
|
seq_printf(p, "CPU%d ",j);
|
|
seq_putc(p, '\n');
|
|
}
|
|
|
|
if (i < NR_IRQS) {
|
|
spin_lock_irqsave(&irq_desc[i].lock, flags);
|
|
action = irq_desc[i].action;
|
|
if (!action)
|
|
goto skip;
|
|
seq_printf(p, "%3d: ",i);
|
|
#ifndef CONFIG_SMP
|
|
seq_printf(p, "%10u ", kstat_irqs(i));
|
|
#else
|
|
for_each_online_cpu(j)
|
|
seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
|
|
#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);
|
|
|
|
seq_putc(p, '\n');
|
|
skip:
|
|
spin_unlock_irqrestore(&irq_desc[i].lock, flags);
|
|
} else if (i == NR_IRQS) {
|
|
seq_putc(p, '\n');
|
|
seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
asmlinkage void spurious_interrupt(struct pt_regs *regs)
|
|
{
|
|
atomic_inc(&irq_err_count);
|
|
}
|
|
|
|
#ifdef CONFIG_KGDB
|
|
extern void breakpoint(void);
|
|
extern void set_debug_traps(void);
|
|
|
|
static int kgdb_flag = 1;
|
|
static int __init nokgdb(char *str)
|
|
{
|
|
kgdb_flag = 0;
|
|
return 1;
|
|
}
|
|
__setup("nokgdb", nokgdb);
|
|
#endif
|
|
|
|
void __init init_IRQ(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < NR_IRQS; i++) {
|
|
irq_desc[i].status = IRQ_DISABLED;
|
|
irq_desc[i].action = NULL;
|
|
irq_desc[i].depth = 1;
|
|
irq_desc[i].handler = &no_irq_type;
|
|
spin_lock_init(&irq_desc[i].lock);
|
|
#ifdef CONFIG_MIPS_MT_SMTC
|
|
irq_hwmask[i] = 0;
|
|
#endif /* CONFIG_MIPS_MT_SMTC */
|
|
}
|
|
|
|
arch_init_irq();
|
|
|
|
#ifdef CONFIG_KGDB
|
|
if (kgdb_flag) {
|
|
printk("Wait for gdb client connection ...\n");
|
|
set_debug_traps();
|
|
breakpoint();
|
|
}
|
|
#endif
|
|
}
|