source: src/linux/universal/linux-4.4/arch/mips/kernel/irq.c @ 28606

Last change on this file since 28606 was 28606, checked in by BrainSlayer, 19 months ago

in progress, untested

File size: 2.0 KB
Line 
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 <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 */
32void ack_bad_irq(unsigned int irq)
33{
34        printk("unexpected IRQ # %d\n", irq);
35}
36
37atomic_t irq_err_count;
38
39int arch_show_interrupts(struct seq_file *p, int prec)
40{
41        seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
42        return 0;
43}
44
45asmlinkage void spurious_interrupt(void)
46{
47        atomic_inc(&irq_err_count);
48}
49
50void __init init_IRQ(void)
51{
52        int i;
53
54        for (i = 0; i < NR_IRQS; i++)
55                irq_set_noprobe(i);
56
57        arch_init_irq();
58}
59
60#ifdef CONFIG_DEBUG_STACKOVERFLOW
61static 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
79static inline void check_stack_overflow(void) {}
80#endif
81
82
83/*
84 * do_IRQ handles all normal device IRQ's (the special
85 * SMP cross-CPU interrupts have their own specific
86 * handlers).
87 */
88void __irq_entry do_IRQ(unsigned int irq)
89{
90        irq_enter();
91        check_stack_overflow();
92        generic_handle_irq(irq);
93        irq_exit();
94}
95
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