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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> |
1fee9db9 | 24 | #include <linux/irqdomain.h> |
1da177e4 | 25 | |
60063497 | 26 | #include <linux/atomic.h> |
7c0f6ba6 | 27 | #include <linux/uaccess.h> |
1da177e4 | 28 | |
fe8bd18f MR |
29 | void *irq_stack[NR_CPUS]; |
30 | ||
1da177e4 LT |
31 | /* |
32 | * 'what should we do if we get a hw irq event on an illegal vector'. | |
33 | * each architecture has to answer this themselves. | |
34 | */ | |
35 | void ack_bad_irq(unsigned int irq) | |
36 | { | |
37 | printk("unexpected IRQ # %d\n", irq); | |
38 | } | |
39 | ||
40 | atomic_t irq_err_count; | |
41 | ||
f8396c17 | 42 | int arch_show_interrupts(struct seq_file *p, int prec) |
1da177e4 | 43 | { |
f8396c17 | 44 | seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count)); |
1da177e4 LT |
45 | return 0; |
46 | } | |
47 | ||
937a8015 | 48 | asmlinkage void spurious_interrupt(void) |
93373ed4 RB |
49 | { |
50 | atomic_inc(&irq_err_count); | |
51 | } | |
52 | ||
1da177e4 LT |
53 | void __init init_IRQ(void) |
54 | { | |
24649c00 | 55 | int i; |
72faa7a7 | 56 | unsigned int order = get_order(IRQ_STACK_SIZE); |
24649c00 RB |
57 | |
58 | for (i = 0; i < NR_IRQS; i++) | |
e4ec7989 | 59 | irq_set_noprobe(i); |
24649c00 | 60 | |
640356a4 PB |
61 | if (cpu_has_veic) |
62 | clear_c0_status(ST0_IM); | |
63 | ||
1da177e4 | 64 | arch_init_irq(); |
fe8bd18f MR |
65 | |
66 | for_each_possible_cpu(i) { | |
72faa7a7 | 67 | void *s = (void *)__get_free_pages(GFP_KERNEL, order); |
fe8bd18f MR |
68 | |
69 | irq_stack[i] = s; | |
70 | pr_debug("CPU%d IRQ stack at 0x%p - 0x%p\n", i, | |
71 | irq_stack[i], irq_stack[i] + IRQ_STACK_SIZE); | |
72 | } | |
1da177e4 | 73 | } |
8f99a162 | 74 | |
5f35b9cd | 75 | #ifdef CONFIG_DEBUG_STACKOVERFLOW |
334c86c4 F |
76 | static inline void check_stack_overflow(void) |
77 | { | |
78 | unsigned long sp; | |
79 | ||
80 | __asm__ __volatile__("move %0, $sp" : "=r" (sp)); | |
81 | sp &= THREAD_MASK; | |
82 | ||
83 | /* | |
84 | * Check for stack overflow: is there less than STACK_WARN free? | |
85 | * STACK_WARN is defined as 1/8 of THREAD_SIZE by default. | |
86 | */ | |
87 | if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) { | |
88 | printk("do_IRQ: stack overflow: %ld\n", | |
89 | sp - sizeof(struct thread_info)); | |
90 | dump_stack(); | |
91 | } | |
92 | } | |
93 | #else | |
94 | static inline void check_stack_overflow(void) {} | |
95 | #endif | |
96 | ||
97 | ||
8f99a162 WZ |
98 | /* |
99 | * do_IRQ handles all normal device IRQ's (the special | |
100 | * SMP cross-CPU interrupts have their own specific | |
101 | * handlers). | |
102 | */ | |
103 | void __irq_entry do_IRQ(unsigned int irq) | |
104 | { | |
105 | irq_enter(); | |
334c86c4 | 106 | check_stack_overflow(); |
8f99a162 WZ |
107 | generic_handle_irq(irq); |
108 | irq_exit(); | |
109 | } | |
110 | ||
1fee9db9 MZ |
111 | #ifdef CONFIG_IRQ_DOMAIN |
112 | void __irq_entry do_domain_IRQ(struct irq_domain *domain, unsigned int hwirq) | |
113 | { | |
1fee9db9 MZ |
114 | irq_enter(); |
115 | check_stack_overflow(); | |
4cb6f4df | 116 | generic_handle_domain_irq(domain, hwirq); |
1fee9db9 MZ |
117 | irq_exit(); |
118 | } | |
119 | #endif |