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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 <linux/uaccess.h>
 27 
 28 void *irq_stack[NR_CPUS];
 29 
 30 /*
 31  * 'what should we do if we get a hw irq event on an illegal vector'.
 32  * each architecture has to answer this themselves.
 33  */
 34 void ack_bad_irq(unsigned int irq)
 35 {
 36         printk("unexpected IRQ # %d\n", irq);
 37 }
 38 
 39 atomic_t irq_err_count;
 40 
 41 int arch_show_interrupts(struct seq_file *p, int prec)
 42 {
 43         seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
 44         return 0;
 45 }
 46 
 47 asmlinkage void spurious_interrupt(void)
 48 {
 49         atomic_inc(&irq_err_count);
 50 }
 51 
 52 void __init init_IRQ(void)
 53 {
 54         int i;
 55         unsigned int order = get_order(IRQ_STACK_SIZE);
 56 
 57         for (i = 0; i < NR_IRQS; i++)
 58                 irq_set_noprobe(i);
 59 
 60         if (cpu_has_veic)
 61                 clear_c0_status(ST0_IM);
 62 
 63         arch_init_irq();
 64 
 65         for_each_possible_cpu(i) {
 66                 void *s = (void *)__get_free_pages(GFP_KERNEL, order);
 67 
 68                 irq_stack[i] = s;
 69                 pr_debug("CPU%d IRQ stack at 0x%p - 0x%p\n", i,
 70                         irq_stack[i], irq_stack[i] + IRQ_STACK_SIZE);
 71         }
 72 }
 73 
 74 #ifdef CONFIG_DEBUG_STACKOVERFLOW
 75 static inline void check_stack_overflow(void)
 76 {
 77         unsigned long sp;
 78 
 79         __asm__ __volatile__("move %0, $sp" : "=r" (sp));
 80         sp &= THREAD_MASK;
 81 
 82         /*
 83          * Check for stack overflow: is there less than STACK_WARN free?
 84          * STACK_WARN is defined as 1/8 of THREAD_SIZE by default.
 85          */
 86         if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) {
 87                 printk("do_IRQ: stack overflow: %ld\n",
 88                        sp - sizeof(struct thread_info));
 89                 dump_stack();
 90         }
 91 }
 92 #else
 93 static inline void check_stack_overflow(void) {}
 94 #endif
 95 
 96 
 97 /*
 98  * do_IRQ handles all normal device IRQ's (the special
 99  * SMP cross-CPU interrupts have their own specific
100  * handlers).
101  */
102 void __irq_entry do_IRQ(unsigned int irq)
103 {
104         irq_enter();
105         check_stack_overflow();
106         generic_handle_irq(irq);
107         irq_exit();
108 }
109 
110 

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