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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> |
b17b0153 | 25 | #include <linux/sched/debug.h> |
1da177e4 LT |
26 | |
27 | #include <linux/kernel_stat.h> | |
28 | #include <linux/signal.h> | |
29 | #include <linux/sched.h> | |
30 | #include <linux/ioport.h> | |
31 | #include <linux/interrupt.h> | |
32 | #include <linux/timex.h> | |
1da177e4 LT |
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> | |
b1a154db | 40 | #include <arch/system.h> |
1da177e4 | 41 | |
1da177e4 | 42 | /* called by the assembler IRQ entry functions defined in irq.h |
49b4ff33 | 43 | * to dispatch the interrupts to registered handlers |
1da177e4 LT |
44 | */ |
45 | ||
46 | asmlinkage void do_IRQ(int irq, struct pt_regs * regs) | |
47 | { | |
2e0cea1d | 48 | unsigned long sp; |
444e0c28 RV |
49 | struct pt_regs *old_regs; |
50 | ||
51 | trace_hardirqs_off(); | |
52 | ||
53 | old_regs = set_irq_regs(regs); | |
2e0cea1d MS |
54 | irq_enter(); |
55 | sp = rdsp(); | |
56 | if (unlikely((sp & (PAGE_SIZE - 1)) < (PAGE_SIZE/8))) { | |
57 | printk("do_IRQ: stack overflow: %lX\n", sp); | |
58 | show_stack(NULL, (unsigned long *)sp); | |
1da177e4 | 59 | } |
c84077ac TG |
60 | generic_handle_irq(irq); |
61 | irq_exit(); | |
eb2746dd | 62 | set_irq_regs(old_regs); |
1da177e4 LT |
63 | } |
64 | ||
1da177e4 LT |
65 | void weird_irq(void) |
66 | { | |
67 | local_irq_disable(); | |
68 | printk("weird irq\n"); | |
69 | while(1); | |
70 | } | |
71 |