1 /* 2 * 3 * linux/arch/cris/kernel/irq.c 4 * 5 * Copyright (c) 2000,2007 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 IRQs 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 * 15 */ 16 17 /* 18 * IRQs 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 22 #include <linux/module.h> 23 #include <linux/ptrace.h> 24 #include <linux/irq.h> 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/random.h> 33 #include <linux/init.h> 34 #include <linux/seq_file.h> 35 #include <linux/errno.h> 36 #include <linux/spinlock.h> 37 38 #include <asm/io.h> 39 #include <arch/system.h> 40 41 /* called by the assembler IRQ entry functions defined in irq.h 42 * to dispatch the interrupts to registered handlers 43 * interrupts are disabled upon entry - depending on if the 44 * interrupt was registered with IRQF_DISABLED or not, interrupts 45 * are re-enabled or not. 46 */ 47 do_IRQ(int irq,struct pt_regs * regs)48asmlinkage void do_IRQ(int irq, struct pt_regs * regs) 49 { 50 unsigned long sp; 51 struct pt_regs *old_regs = set_irq_regs(regs); 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 } 58 generic_handle_irq(irq); 59 irq_exit(); 60 set_irq_regs(old_regs); 61 } 62 weird_irq(void)63void weird_irq(void) 64 { 65 local_irq_disable(); 66 printk("weird irq\n"); 67 while(1); 68 } 69 70