arch/cris/kernel/irq.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *
   4  *      linux/arch/cris/kernel/irq.c
   5  *
   6  *      Copyright (c) 2000,2007 Axis Communications AB
   7  *
   8  *      Authors: Bjorn Wesen (bjornw@axis.com)
   9  *
  10  * This file contains the code used by various IRQ handling routines:
  11  * asking for different IRQs should be done through these routines
  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  *
  16  */
  17
  18 /*
  19  * IRQs are in fact implemented a bit like signal handlers for the kernel.
  20  * Naturally it's not a 1:1 relation, but there are similarities.
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/ptrace.h>
  25 #include <linux/irq.h>
  26 #include <linux/sched/debug.h>
  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>
  34 #include <linux/random.h>
  35 #include <linux/init.h>
  36 #include <linux/seq_file.h>
  37 #include <linux/errno.h>
  38 #include <linux/spinlock.h>
  39
  40 #include <asm/io.h>
  41 #include <arch/system.h>
  42
  43 /* called by the assembler IRQ entry functions defined in irq.h
  44  * to dispatch the interrupts to registered handlers
  45  */
  46
  47 asmlinkage void do_IRQ(int irq, struct pt_regs * regs)
  48 {
  49         unsigned long sp;
  50         struct pt_regs *old_regs;
  51
  52         trace_hardirqs_off();
  53
  54         old_regs = set_irq_regs(regs);
  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);
  60         }
  61         generic_handle_irq(irq);
  62         irq_exit();
  63         set_irq_regs(old_regs);
  64 }
  65
  66 void weird_irq(void)
  67 {
  68         local_irq_disable();
  69         printk("weird irq\n");
  70         while(1);
  71 }
  72