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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 */
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>
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>
22#include <linux/kgdb.h>
23#include <linux/ftrace.h>
24#include <linux/irqdomain.h>
25
26#include <linux/atomic.h>
27#include <linux/uaccess.h>
28
29void *irq_stack[NR_CPUS];
30
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 */
35void ack_bad_irq(unsigned int irq)
36{
37 printk("unexpected IRQ # %d\n", irq);
38}
39
40atomic_t irq_err_count;
41
42int arch_show_interrupts(struct seq_file *p, int prec)
43{
44 seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
45 return 0;
46}
47
48asmlinkage void spurious_interrupt(void)
49{
50 atomic_inc(&irq_err_count);
51}
52
53void __init init_IRQ(void)
54{
55 int i;
56 unsigned int order = get_order(IRQ_STACK_SIZE);
57
58 for (i = 0; i < NR_IRQS; i++)
59 irq_set_noprobe(i);
60
61 if (cpu_has_veic)
62 clear_c0_status(ST0_IM);
63
64 arch_init_irq();
65
66 for_each_possible_cpu(i) {
67 void *s = (void *)__get_free_pages(GFP_KERNEL, order);
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 }
73}
74
75#ifdef CONFIG_DEBUG_STACKOVERFLOW
76static 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
94static inline void check_stack_overflow(void) {}
95#endif
96
97
98/*
99 * do_IRQ handles all normal device IRQ's (the special
100 * SMP cross-CPU interrupts have their own specific
101 * handlers).
102 */
103void __irq_entry do_IRQ(unsigned int irq)
104{
105 irq_enter();
106 check_stack_overflow();
107 generic_handle_irq(irq);
108 irq_exit();
109}
110
111#ifdef CONFIG_IRQ_DOMAIN
112void __irq_entry do_domain_IRQ(struct irq_domain *domain, unsigned int hwirq)
113{
114 struct irq_desc *desc;
115
116 irq_enter();
117 check_stack_overflow();
118
119 desc = irq_resolve_mapping(domain, hwirq);
120 if (likely(desc))
121 handle_irq_desc(desc);
122
123 irq_exit();
124}
125#endif
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 */
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>
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>
22#include <linux/kgdb.h>
23#include <linux/ftrace.h>
24
25#include <linux/atomic.h>
26#include <linux/uaccess.h>
27
28void *irq_stack[NR_CPUS];
29
30/*
31 * 'what should we do if we get a hw irq event on an illegal vector'.
32 * each architecture has to answer this themselves.
33 */
34void ack_bad_irq(unsigned int irq)
35{
36 printk("unexpected IRQ # %d\n", irq);
37}
38
39atomic_t irq_err_count;
40
41int arch_show_interrupts(struct seq_file *p, int prec)
42{
43 seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
44 return 0;
45}
46
47asmlinkage void spurious_interrupt(void)
48{
49 atomic_inc(&irq_err_count);
50}
51
52void __init init_IRQ(void)
53{
54 int i;
55 unsigned int order = get_order(IRQ_STACK_SIZE);
56
57 for (i = 0; i < NR_IRQS; i++)
58 irq_set_noprobe(i);
59
60 if (cpu_has_veic)
61 clear_c0_status(ST0_IM);
62
63 arch_init_irq();
64
65 for_each_possible_cpu(i) {
66 void *s = (void *)__get_free_pages(GFP_KERNEL, order);
67
68 irq_stack[i] = s;
69 pr_debug("CPU%d IRQ stack at 0x%p - 0x%p\n", i,
70 irq_stack[i], irq_stack[i] + IRQ_STACK_SIZE);
71 }
72}
73
74#ifdef CONFIG_DEBUG_STACKOVERFLOW
75static inline void check_stack_overflow(void)
76{
77 unsigned long sp;
78
79 __asm__ __volatile__("move %0, $sp" : "=r" (sp));
80 sp &= THREAD_MASK;
81
82 /*
83 * Check for stack overflow: is there less than STACK_WARN free?
84 * STACK_WARN is defined as 1/8 of THREAD_SIZE by default.
85 */
86 if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) {
87 printk("do_IRQ: stack overflow: %ld\n",
88 sp - sizeof(struct thread_info));
89 dump_stack();
90 }
91}
92#else
93static inline void check_stack_overflow(void) {}
94#endif
95
96
97/*
98 * do_IRQ handles all normal device IRQ's (the special
99 * SMP cross-CPU interrupts have their own specific
100 * handlers).
101 */
102void __irq_entry do_IRQ(unsigned int irq)
103{
104 irq_enter();
105 check_stack_overflow();
106 generic_handle_irq(irq);
107 irq_exit();
108}
109