Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * | |
3 | * linux/arch/cris/kernel/irq.c | |
4 | * | |
5 | * Copyright (c) 2000,2001 Axis Communications AB | |
6 | * | |
7 | * Authors: Bjorn Wesen (bjornw@axis.com) | |
8 | * | |
9 | * This file contains the code used by various IRQ handling routines: | |
10 | * asking for different IRQ's should be done through these routines | |
11 | * instead of just grabbing them. Thus setups with different IRQ numbers | |
12 | * shouldn't result in any weird surprises, and installing new handlers | |
13 | * should be easier. | |
14 | * | |
1da177e4 LT |
15 | */ |
16 | ||
17 | /* | |
18 | * IRQ's are in fact implemented a bit like signal handlers for the kernel. | |
19 | * Naturally it's not a 1:1 relation, but there are similarities. | |
20 | */ | |
21 | ||
1da177e4 LT |
22 | #include <linux/module.h> |
23 | #include <linux/ptrace.h> | |
2e0cea1d | 24 | #include <linux/irq.h> |
1da177e4 LT |
25 | |
26 | #include <linux/kernel_stat.h> | |
27 | #include <linux/signal.h> | |
28 | #include <linux/sched.h> | |
29 | #include <linux/ioport.h> | |
30 | #include <linux/interrupt.h> | |
31 | #include <linux/timex.h> | |
32 | #include <linux/slab.h> | |
33 | #include <linux/random.h> | |
34 | #include <linux/init.h> | |
35 | #include <linux/seq_file.h> | |
36 | #include <linux/errno.h> | |
2e0cea1d | 37 | #include <linux/spinlock.h> |
1da177e4 LT |
38 | |
39 | #include <asm/io.h> | |
40 | ||
2e0cea1d | 41 | void ack_bad_irq(unsigned int irq) |
1da177e4 | 42 | { |
2e0cea1d | 43 | printk("unexpected IRQ trap at vector %02x\n", irq); |
1da177e4 LT |
44 | } |
45 | ||
1da177e4 LT |
46 | int show_interrupts(struct seq_file *p, void *v) |
47 | { | |
2e0cea1d | 48 | int i = *(loff_t *) v, j; |
1da177e4 LT |
49 | struct irqaction * action; |
50 | unsigned long flags; | |
51 | ||
2e0cea1d MS |
52 | if (i == 0) { |
53 | seq_printf(p, " "); | |
394e3902 AM |
54 | for_each_online_cpu(j) |
55 | seq_printf(p, "CPU%d ",j); | |
2e0cea1d MS |
56 | seq_putc(p, '\n'); |
57 | } | |
58 | ||
1da177e4 | 59 | if (i < NR_IRQS) { |
2e0cea1d MS |
60 | spin_lock_irqsave(&irq_desc[i].lock, flags); |
61 | action = irq_desc[i].action; | |
62 | if (!action) | |
1da177e4 | 63 | goto skip; |
2e0cea1d MS |
64 | seq_printf(p, "%3d: ",i); |
65 | #ifndef CONFIG_SMP | |
66 | seq_printf(p, "%10u ", kstat_irqs(i)); | |
67 | #else | |
394e3902 AM |
68 | for_each_online_cpu(j) |
69 | seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]); | |
2e0cea1d | 70 | #endif |
d1bef4ed | 71 | seq_printf(p, " %14s", irq_desc[i].chip->typename); |
2e0cea1d MS |
72 | seq_printf(p, " %s", action->name); |
73 | ||
74 | for (action=action->next; action; action = action->next) | |
75 | seq_printf(p, ", %s", action->name); | |
76 | ||
1da177e4 LT |
77 | seq_putc(p, '\n'); |
78 | skip: | |
2e0cea1d | 79 | spin_unlock_irqrestore(&irq_desc[i].lock, flags); |
1da177e4 LT |
80 | } |
81 | return 0; | |
82 | } | |
83 | ||
2e0cea1d | 84 | |
1da177e4 LT |
85 | /* called by the assembler IRQ entry functions defined in irq.h |
86 | * to dispatch the interrupts to registred handlers | |
87 | * interrupts are disabled upon entry - depending on if the | |
aa7135ff | 88 | * interrupt was registred with IRQF_DISABLED or not, interrupts |
1da177e4 LT |
89 | * are re-enabled or not. |
90 | */ | |
91 | ||
92 | asmlinkage void do_IRQ(int irq, struct pt_regs * regs) | |
93 | { | |
2e0cea1d MS |
94 | unsigned long sp; |
95 | irq_enter(); | |
96 | sp = rdsp(); | |
97 | if (unlikely((sp & (PAGE_SIZE - 1)) < (PAGE_SIZE/8))) { | |
98 | printk("do_IRQ: stack overflow: %lX\n", sp); | |
99 | show_stack(NULL, (unsigned long *)sp); | |
1da177e4 | 100 | } |
2e0cea1d MS |
101 | __do_IRQ(irq, regs); |
102 | irq_exit(); | |
1da177e4 LT |
103 | } |
104 | ||
1da177e4 LT |
105 | void weird_irq(void) |
106 | { | |
107 | local_irq_disable(); | |
108 | printk("weird irq\n"); | |
109 | while(1); | |
110 | } | |
111 |