69 lines
1.7 KiB
C
69 lines
1.7 KiB
C
/*
|
|
*
|
|
* linux/arch/cris/kernel/irq.c
|
|
*
|
|
* Copyright (c) 2000,2007 Axis Communications AB
|
|
*
|
|
* Authors: Bjorn Wesen (bjornw@axis.com)
|
|
*
|
|
* This file contains the code used by various IRQ handling routines:
|
|
* asking for different IRQs should be done through these routines
|
|
* instead of just grabbing them. Thus setups with different IRQ numbers
|
|
* shouldn't result in any weird surprises, and installing new handlers
|
|
* should be easier.
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* IRQs are in fact implemented a bit like signal handlers for the kernel.
|
|
* Naturally it's not a 1:1 relation, but there are similarities.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/irq.h>
|
|
|
|
#include <linux/kernel_stat.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/timex.h>
|
|
#include <linux/random.h>
|
|
#include <linux/init.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/spinlock.h>
|
|
|
|
#include <asm/io.h>
|
|
|
|
/* called by the assembler IRQ entry functions defined in irq.h
|
|
* to dispatch the interrupts to registered handlers
|
|
* interrupts are disabled upon entry - depending on if the
|
|
* interrupt was registered with IRQF_DISABLED or not, interrupts
|
|
* are re-enabled or not.
|
|
*/
|
|
|
|
asmlinkage void do_IRQ(int irq, struct pt_regs * regs)
|
|
{
|
|
unsigned long sp;
|
|
struct pt_regs *old_regs = set_irq_regs(regs);
|
|
irq_enter();
|
|
sp = rdsp();
|
|
if (unlikely((sp & (PAGE_SIZE - 1)) < (PAGE_SIZE/8))) {
|
|
printk("do_IRQ: stack overflow: %lX\n", sp);
|
|
show_stack(NULL, (unsigned long *)sp);
|
|
}
|
|
generic_handle_irq(irq);
|
|
irq_exit();
|
|
set_irq_regs(old_regs);
|
|
}
|
|
|
|
void weird_irq(void)
|
|
{
|
|
local_irq_disable();
|
|
printk("weird irq\n");
|
|
while(1);
|
|
}
|
|
|