Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * |
| 3 | * linux/arch/cris/kernel/irq.c |
| 4 | * |
Jesper Nilsson | eb2746d | 2007-11-14 17:00:52 -0800 | [diff] [blame] | 5 | * Copyright (c) 2000,2007 Axis Communications AB |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * |
| 7 | * Authors: Bjorn Wesen (bjornw@axis.com) |
| 8 | * |
| 9 | * This file contains the code used by various IRQ handling routines: |
Simon Arlott | 49b4ff3 | 2007-10-20 01:08:50 +0200 | [diff] [blame] | 10 | * asking for different IRQs should be done through these routines |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | */ |
| 16 | |
| 17 | /* |
Simon Arlott | 49b4ff3 | 2007-10-20 01:08:50 +0200 | [diff] [blame] | 18 | * IRQs are in fact implemented a bit like signal handlers for the kernel. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | * Naturally it's not a 1:1 relation, but there are similarities. |
| 20 | */ |
| 21 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/module.h> |
| 23 | #include <linux/ptrace.h> |
Mikael Starvik | 2e0cea1 | 2005-07-27 11:44:36 -0700 | [diff] [blame] | 24 | #include <linux/irq.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <linux/random.h> |
| 33 | #include <linux/init.h> |
| 34 | #include <linux/seq_file.h> |
| 35 | #include <linux/errno.h> |
Mikael Starvik | 2e0cea1 | 2005-07-27 11:44:36 -0700 | [diff] [blame] | 36 | #include <linux/spinlock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
| 38 | #include <asm/io.h> |
David Howells | b1a154d | 2012-03-28 18:30:02 +0100 | [diff] [blame] | 39 | #include <arch/system.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | /* called by the assembler IRQ entry functions defined in irq.h |
Simon Arlott | 49b4ff3 | 2007-10-20 01:08:50 +0200 | [diff] [blame] | 42 | * to dispatch the interrupts to registered handlers |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | * interrupts are disabled upon entry - depending on if the |
Simon Arlott | 49b4ff3 | 2007-10-20 01:08:50 +0200 | [diff] [blame] | 44 | * interrupt was registered with IRQF_DISABLED or not, interrupts |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | * are re-enabled or not. |
| 46 | */ |
| 47 | |
| 48 | asmlinkage void do_IRQ(int irq, struct pt_regs * regs) |
| 49 | { |
Mikael Starvik | 2e0cea1 | 2005-07-27 11:44:36 -0700 | [diff] [blame] | 50 | unsigned long sp; |
Jesper Nilsson | eb2746d | 2007-11-14 17:00:52 -0800 | [diff] [blame] | 51 | struct pt_regs *old_regs = set_irq_regs(regs); |
Mikael Starvik | 2e0cea1 | 2005-07-27 11:44:36 -0700 | [diff] [blame] | 52 | irq_enter(); |
| 53 | sp = rdsp(); |
| 54 | if (unlikely((sp & (PAGE_SIZE - 1)) < (PAGE_SIZE/8))) { |
| 55 | printk("do_IRQ: stack overflow: %lX\n", sp); |
| 56 | show_stack(NULL, (unsigned long *)sp); |
| 57 | } |
Thomas Gleixner | c84077a | 2011-01-19 13:59:01 +0100 | [diff] [blame] | 58 | generic_handle_irq(irq); |
| 59 | irq_exit(); |
Jesper Nilsson | eb2746d | 2007-11-14 17:00:52 -0800 | [diff] [blame] | 60 | set_irq_regs(old_regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | } |
| 62 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | void weird_irq(void) |
| 64 | { |
| 65 | local_irq_disable(); |
| 66 | printk("weird irq\n"); |
| 67 | while(1); |
| 68 | } |
| 69 | |