source: src/linux/universal/linux-4.9/arch/mips/kernel/irq.c @ 31884

Last change on this file since 31884 was 31884, checked in by brainslayer, 7 days ago

update kernels

File size: 2.4 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        if (cpu_has_veic)
60                clear_c0_status(ST0_IM);
61
62        arch_init_irq();
63
64        for_each_possible_cpu(i) {
65                int irq_pages = IRQ_STACK_SIZE / PAGE_SIZE;
66                void *s = (void *)__get_free_pages(GFP_KERNEL, irq_pages);
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
Note: See TracBrowser for help on using the repository browser.