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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * | |
4 | * linux/arch/cris/kernel/irq.c | |
5 | * | |
eb2746dd | 6 | * Copyright (c) 2000,2007 Axis Communications AB |
1da177e4 LT |
7 | * |
8 | * Authors: Bjorn Wesen (bjornw@axis.com) | |
9 | * | |
10 | * This file contains the code used by various IRQ handling routines: | |
49b4ff33 | 11 | * asking for different IRQs should be done through these routines |
1da177e4 LT |
12 | * instead of just grabbing them. Thus setups with different IRQ numbers |
13 | * shouldn't result in any weird surprises, and installing new handlers | |
14 | * should be easier. | |
15 | * | |
1da177e4 LT |
16 | */ |
17 | ||
18 | /* | |
49b4ff33 | 19 | * IRQs are in fact implemented a bit like signal handlers for the kernel. |
1da177e4 LT |
20 | * Naturally it's not a 1:1 relation, but there are similarities. |
21 | */ | |
22 | ||
1da177e4 LT |
23 | #include <linux/module.h> |
24 | #include <linux/ptrace.h> | |
2e0cea1d | 25 | #include <linux/irq.h> |
b17b0153 | 26 | #include <linux/sched/debug.h> |
1da177e4 LT |
27 | |
28 | #include <linux/kernel_stat.h> | |
29 | #include <linux/signal.h> | |
30 | #include <linux/sched.h> | |
31 | #include <linux/ioport.h> | |
32 | #include <linux/interrupt.h> | |
33 | #include <linux/timex.h> | |
1da177e4 LT |
34 | #include <linux/random.h> |
35 | #include <linux/init.h> | |
36 | #include <linux/seq_file.h> | |
37 | #include <linux/errno.h> | |
2e0cea1d | 38 | #include <linux/spinlock.h> |
1da177e4 LT |
39 | |
40 | #include <asm/io.h> | |
b1a154db | 41 | #include <arch/system.h> |
1da177e4 | 42 | |
1da177e4 | 43 | /* called by the assembler IRQ entry functions defined in irq.h |
49b4ff33 | 44 | * to dispatch the interrupts to registered handlers |
1da177e4 LT |
45 | */ |
46 | ||
47 | asmlinkage void do_IRQ(int irq, struct pt_regs * regs) | |
48 | { | |
2e0cea1d | 49 | unsigned long sp; |
444e0c28 RV |
50 | struct pt_regs *old_regs; |
51 | ||
52 | trace_hardirqs_off(); | |
53 | ||
54 | old_regs = set_irq_regs(regs); | |
2e0cea1d MS |
55 | irq_enter(); |
56 | sp = rdsp(); | |
57 | if (unlikely((sp & (PAGE_SIZE - 1)) < (PAGE_SIZE/8))) { | |
58 | printk("do_IRQ: stack overflow: %lX\n", sp); | |
59 | show_stack(NULL, (unsigned long *)sp); | |
1da177e4 | 60 | } |
c84077ac TG |
61 | generic_handle_irq(irq); |
62 | irq_exit(); | |
eb2746dd | 63 | set_irq_regs(old_regs); |
1da177e4 LT |
64 | } |
65 | ||
1da177e4 LT |
66 | void weird_irq(void) |
67 | { | |
68 | local_irq_disable(); | |
69 | printk("weird irq\n"); | |
70 | while(1); | |
71 | } | |
72 |