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
6 * Code to handle x86 style IRQs plus some generic interrupt stuff.
8 * Copyright (C) 1992 Linus Torvalds
9 * Copyright (C) 1994 - 2000 Ralf Baechle
11 #include <linux/kernel.h>
12 #include <linux/delay.h>
13 #include <linux/init.h>
14 #include <linux/interrupt.h>
15 #include <linux/kernel_stat.h>
16 #include <linux/proc_fs.h>
18 #include <linux/random.h>
19 #include <linux/sched.h>
20 #include <linux/seq_file.h>
21 #include <linux/kallsyms.h>
22 #include <linux/kgdb.h>
23 #include <linux/ftrace.h>
25 #include <linux/atomic.h>
26 #include <linux/uaccess.h>
29 * 'what should we do if we get a hw irq event on an illegal vector'.
30 * each architecture has to answer this themselves.
32 void ack_bad_irq(unsigned int irq)
34 printk("unexpected IRQ # %d\n", irq);
37 atomic_t irq_err_count;
39 int arch_show_interrupts(struct seq_file *p, int prec)
41 seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
45 asmlinkage void spurious_interrupt(void)
47 atomic_inc(&irq_err_count);
50 void __init init_IRQ(void)
54 for (i = 0; i < NR_IRQS; i++)
58 clear_c0_status(ST0_IM);
63 #ifdef CONFIG_DEBUG_STACKOVERFLOW
64 static inline void check_stack_overflow(void)
68 __asm__ __volatile__("move %0, $sp" : "=r" (sp));
72 * Check for stack overflow: is there less than STACK_WARN free?
73 * STACK_WARN is defined as 1/8 of THREAD_SIZE by default.
75 if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) {
76 printk("do_IRQ: stack overflow: %ld\n",
77 sp - sizeof(struct thread_info));
82 static inline void check_stack_overflow(void) {}
87 * do_IRQ handles all normal device IRQ's (the special
88 * SMP cross-CPU interrupts have their own specific
91 void __irq_entry do_IRQ(unsigned int irq)
94 check_stack_overflow();
95 generic_handle_irq(irq);