Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * | |
3 | * linux/arch/cris/kernel/irq.c | |
4 | * | |
eb2746dd | 5 | * Copyright (c) 2000,2007 Axis Communications AB |
1da177e4 LT |
6 | * |
7 | * Authors: Bjorn Wesen (bjornw@axis.com) | |
8 | * | |
9 | * This file contains the code used by various IRQ handling routines: | |
49b4ff33 | 10 | * asking for different IRQs should be done through these routines |
1da177e4 LT |
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 | /* | |
49b4ff33 | 18 | * IRQs are in fact implemented a bit like signal handlers for the kernel. |
1da177e4 LT |
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> | |
1da177e4 LT |
32 | #include <linux/random.h> |
33 | #include <linux/init.h> | |
34 | #include <linux/seq_file.h> | |
35 | #include <linux/errno.h> | |
2e0cea1d | 36 | #include <linux/spinlock.h> |
1da177e4 LT |
37 | |
38 | #include <asm/io.h> | |
39 | ||
1da177e4 LT |
40 | int show_interrupts(struct seq_file *p, void *v) |
41 | { | |
2e0cea1d | 42 | int i = *(loff_t *) v, j; |
1da177e4 LT |
43 | struct irqaction * action; |
44 | unsigned long flags; | |
45 | ||
2e0cea1d MS |
46 | if (i == 0) { |
47 | seq_printf(p, " "); | |
394e3902 AM |
48 | for_each_online_cpu(j) |
49 | seq_printf(p, "CPU%d ",j); | |
2e0cea1d MS |
50 | seq_putc(p, '\n'); |
51 | } | |
52 | ||
1da177e4 | 53 | if (i < NR_IRQS) { |
239007b8 | 54 | raw_spin_lock_irqsave(&irq_desc[i].lock, flags); |
2e0cea1d MS |
55 | action = irq_desc[i].action; |
56 | if (!action) | |
1da177e4 | 57 | goto skip; |
2e0cea1d MS |
58 | seq_printf(p, "%3d: ",i); |
59 | #ifndef CONFIG_SMP | |
60 | seq_printf(p, "%10u ", kstat_irqs(i)); | |
61 | #else | |
394e3902 | 62 | for_each_online_cpu(j) |
0b0f0b1c | 63 | seq_printf(p, "%10u ", kstat_irqs_cpu(i, j)); |
2e0cea1d | 64 | #endif |
d8fe989e | 65 | seq_printf(p, " %14s", irq_desc[i].chip->name); |
2e0cea1d MS |
66 | seq_printf(p, " %s", action->name); |
67 | ||
68 | for (action=action->next; action; action = action->next) | |
69 | seq_printf(p, ", %s", action->name); | |
70 | ||
1da177e4 LT |
71 | seq_putc(p, '\n'); |
72 | skip: | |
239007b8 | 73 | raw_spin_unlock_irqrestore(&irq_desc[i].lock, flags); |
1da177e4 LT |
74 | } |
75 | return 0; | |
76 | } | |
77 | ||
2e0cea1d | 78 | |
1da177e4 | 79 | /* called by the assembler IRQ entry functions defined in irq.h |
49b4ff33 | 80 | * to dispatch the interrupts to registered handlers |
1da177e4 | 81 | * interrupts are disabled upon entry - depending on if the |
49b4ff33 | 82 | * interrupt was registered with IRQF_DISABLED or not, interrupts |
1da177e4 LT |
83 | * are re-enabled or not. |
84 | */ | |
85 | ||
86 | asmlinkage void do_IRQ(int irq, struct pt_regs * regs) | |
87 | { | |
2e0cea1d | 88 | unsigned long sp; |
eb2746dd | 89 | struct pt_regs *old_regs = set_irq_regs(regs); |
2e0cea1d MS |
90 | irq_enter(); |
91 | sp = rdsp(); | |
92 | if (unlikely((sp & (PAGE_SIZE - 1)) < (PAGE_SIZE/8))) { | |
93 | printk("do_IRQ: stack overflow: %lX\n", sp); | |
94 | show_stack(NULL, (unsigned long *)sp); | |
1da177e4 | 95 | } |
eb2746dd | 96 | __do_IRQ(irq); |
2e0cea1d | 97 | irq_exit(); |
eb2746dd | 98 | set_irq_regs(old_regs); |
1da177e4 LT |
99 | } |
100 | ||
1da177e4 LT |
101 | void weird_irq(void) |
102 | { | |
103 | local_irq_disable(); | |
104 | printk("weird irq\n"); | |
105 | while(1); | |
106 | } | |
107 |