source: src/linux/universal/linux-4.4/arch/mips/kernel/irq.c @ 31884

Last change on this file since 31884 was 31884, checked in by brainslayer, 6 weeks ago

update kernels

File size: 2.3 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
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
56        for (i = 0; i < NR_IRQS; i++)
57                irq_set_noprobe(i);
58
59        arch_init_irq();
60
61        for_each_possible_cpu(i) {
62                int irq_pages = IRQ_STACK_SIZE / PAGE_SIZE;
63                void *s = (void *)__get_free_pages(GFP_KERNEL, irq_pages);
64
65                irq_stack[i] = s;
66                pr_debug("CPU%d IRQ stack at 0x%p - 0x%p\n", i,
67                        irq_stack[i], irq_stack[i] + IRQ_STACK_SIZE);
68        }
69}
70
71#ifdef CONFIG_DEBUG_STACKOVERFLOW
72static inline void check_stack_overflow(void)
73{
74        unsigned long sp;
75
76        __asm__ __volatile__("move %0, $sp" : "=r" (sp));
77        sp &= THREAD_MASK;
78
79        /*
80         * Check for stack overflow: is there less than STACK_WARN free?
81         * STACK_WARN is defined as 1/8 of THREAD_SIZE by default.
82         */
83        if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) {
84                printk("do_IRQ: stack overflow: %ld\n",
85                       sp - sizeof(struct thread_info));
86                dump_stack();
87        }
88}
89#else
90static inline void check_stack_overflow(void) {}
91#endif
92
93
94/*
95 * do_IRQ handles all normal device IRQ's (the special
96 * SMP cross-CPU interrupts have their own specific
97 * handlers).
98 */
99void __irq_entry do_IRQ(unsigned int irq)
100{
101        irq_enter();
102        check_stack_overflow();
103        generic_handle_irq(irq);
104        irq_exit();
105}
106
Note: See TracBrowser for help on using the repository browser.