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Linux/arch/mips/kernel/irq.c

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  1 /*
  2  * This file is subject to the terms and conditions of the GNU General Public
  3  * License.  See the file "COPYING" in the main directory of this archive
  4  * for more details.
  5  *
  6  * Code to handle x86 style IRQs plus some generic interrupt stuff.
  7  *
  8  * Copyright (C) 1992 Linus Torvalds
  9  * Copyright (C) 1994 - 2000 Ralf Baechle
 10  */
 11 #include <linux/kernel.h>
 12 #include <linux/delay.h>
 13 #include <linux/init.h>
 14 #include <linux/interrupt.h>
 15 #include <linux/kernel_stat.h>
 16 #include <linux/proc_fs.h>
 17 #include <linux/mm.h>
 18 #include <linux/random.h>
 19 #include <linux/sched.h>
 20 #include <linux/seq_file.h>
 21 #include <linux/kallsyms.h>
 22 #include <linux/kgdb.h>
 23 #include <linux/ftrace.h>
 24 
 25 #include <linux/atomic.h>
 26 #include <asm/uaccess.h>
 27 
 28 /*
 29  * 'what should we do if we get a hw irq event on an illegal vector'.
 30  * each architecture has to answer this themselves.
 31  */
 32 void ack_bad_irq(unsigned int irq)
 33 {
 34         printk("unexpected IRQ # %d\n", irq);
 35 }
 36 
 37 atomic_t irq_err_count;
 38 
 39 int arch_show_interrupts(struct seq_file *p, int prec)
 40 {
 41         seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
 42         return 0;
 43 }
 44 
 45 asmlinkage void spurious_interrupt(void)
 46 {
 47         atomic_inc(&irq_err_count);
 48 }
 49 
 50 void __init init_IRQ(void)
 51 {
 52         int i;
 53 
 54         for (i = 0; i < NR_IRQS; i++)
 55                 irq_set_noprobe(i);
 56 
 57         arch_init_irq();
 58 }
 59 
 60 #ifdef CONFIG_DEBUG_STACKOVERFLOW
 61 static inline void check_stack_overflow(void)
 62 {
 63         unsigned long sp;
 64 
 65         __asm__ __volatile__("move %0, $sp" : "=r" (sp));
 66         sp &= THREAD_MASK;
 67 
 68         /*
 69          * Check for stack overflow: is there less than STACK_WARN free?
 70          * STACK_WARN is defined as 1/8 of THREAD_SIZE by default.
 71          */
 72         if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) {
 73                 printk("do_IRQ: stack overflow: %ld\n",
 74                        sp - sizeof(struct thread_info));
 75                 dump_stack();
 76         }
 77 }
 78 #else
 79 static inline void check_stack_overflow(void) {}
 80 #endif
 81 
 82 
 83 /*
 84  * do_IRQ handles all normal device IRQ's (the special
 85  * SMP cross-CPU interrupts have their own specific
 86  * handlers).
 87  */
 88 void __irq_entry do_IRQ(unsigned int irq)
 89 {
 90         irq_enter();
 91         check_stack_overflow();
 92         generic_handle_irq(irq);
 93         irq_exit();
 94 }
 95 
 96 

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