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1da177e4 LT |
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 | * Code to handle x86 style IRQs plus some generic interrupt stuff. | |
7 | * | |
8 | * Copyright (C) 1992 Linus Torvalds | |
9 | * Copyright (C) 1994 - 2000 Ralf Baechle | |
10 | */ | |
1da177e4 LT |
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> | |
1da177e4 | 16 | #include <linux/proc_fs.h> |
1da177e4 LT |
17 | #include <linux/mm.h> |
18 | #include <linux/random.h> | |
19 | #include <linux/sched.h> | |
20 | #include <linux/seq_file.h> | |
21 | #include <linux/kallsyms.h> | |
88547001 | 22 | #include <linux/kgdb.h> |
8f99a162 | 23 | #include <linux/ftrace.h> |
1da177e4 | 24 | |
60063497 | 25 | #include <linux/atomic.h> |
1da177e4 LT |
26 | #include <asm/uaccess.h> |
27 | ||
28 | /* | |
29 | * 'what should we do if we get a hw irq event on an illegal vector'. | |
30 | * each architecture has to answer this themselves. | |
31 | */ | |
32 | void ack_bad_irq(unsigned int irq) | |
33 | { | |
34 | printk("unexpected IRQ # %d\n", irq); | |
35 | } | |
36 | ||
37 | atomic_t irq_err_count; | |
38 | ||
f8396c17 | 39 | int arch_show_interrupts(struct seq_file *p, int prec) |
1da177e4 | 40 | { |
f8396c17 | 41 | seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count)); |
1da177e4 LT |
42 | return 0; |
43 | } | |
44 | ||
937a8015 | 45 | asmlinkage void spurious_interrupt(void) |
93373ed4 RB |
46 | { |
47 | atomic_inc(&irq_err_count); | |
48 | } | |
49 | ||
1da177e4 LT |
50 | void __init init_IRQ(void) |
51 | { | |
24649c00 RB |
52 | int i; |
53 | ||
54 | for (i = 0; i < NR_IRQS; i++) | |
e4ec7989 | 55 | irq_set_noprobe(i); |
24649c00 | 56 | |
1da177e4 | 57 | arch_init_irq(); |
1da177e4 | 58 | } |
8f99a162 | 59 | |
5f35b9cd | 60 | #ifdef CONFIG_DEBUG_STACKOVERFLOW |
334c86c4 F |
61 | static inline void check_stack_overflow(void) |
62 | { | |
63 | unsigned long sp; | |
64 | ||
65 | __asm__ __volatile__("move %0, $sp" : "=r" (sp)); | |
66 | sp &= THREAD_MASK; | |
67 | ||
68 | /* | |
69 | * Check for stack overflow: is there less than STACK_WARN free? | |
70 | * STACK_WARN is defined as 1/8 of THREAD_SIZE by default. | |
71 | */ | |
72 | if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) { | |
73 | printk("do_IRQ: stack overflow: %ld\n", | |
74 | sp - sizeof(struct thread_info)); | |
75 | dump_stack(); | |
76 | } | |
77 | } | |
78 | #else | |
79 | static inline void check_stack_overflow(void) {} | |
80 | #endif | |
81 | ||
82 | ||
8f99a162 WZ |
83 | /* |
84 | * do_IRQ handles all normal device IRQ's (the special | |
85 | * SMP cross-CPU interrupts have their own specific | |
86 | * handlers). | |
87 | */ | |
88 | void __irq_entry do_IRQ(unsigned int irq) | |
89 | { | |
90 | irq_enter(); | |
334c86c4 | 91 | check_stack_overflow(); |
8f99a162 WZ |
92 | generic_handle_irq(irq); |
93 | irq_exit(); | |
94 | } | |
95 |