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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 #include <linux/irqdomain.h>
 25 
 26 #include <linux/atomic.h>
 27 #include <linux/uaccess.h>
 28 
 29 void *irq_stack[NR_CPUS];
 30 
 31 /*
 32  * 'what should we do if we get a hw irq event on an illegal vector'.
 33  * each architecture has to answer this themselves.
 34  */
 35 void ack_bad_irq(unsigned int irq)
 36 {
 37         printk("unexpected IRQ # %d\n", irq);
 38 }
 39 
 40 atomic_t irq_err_count;
 41 
 42 int arch_show_interrupts(struct seq_file *p, int prec)
 43 {
 44         seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
 45         return 0;
 46 }
 47 
 48 asmlinkage void spurious_interrupt(void)
 49 {
 50         atomic_inc(&irq_err_count);
 51 }
 52 
 53 void __init init_IRQ(void)
 54 {
 55         int i;
 56         unsigned int order = get_order(IRQ_STACK_SIZE);
 57 
 58         for (i = 0; i < NR_IRQS; i++)
 59                 irq_set_noprobe(i);
 60 
 61         if (cpu_has_veic)
 62                 clear_c0_status(ST0_IM);
 63 
 64         arch_init_irq();
 65 
 66         for_each_possible_cpu(i) {
 67                 void *s = (void *)__get_free_pages(GFP_KERNEL, order);
 68 
 69                 irq_stack[i] = s;
 70                 pr_debug("CPU%d IRQ stack at 0x%p - 0x%p\n", i,
 71                         irq_stack[i], irq_stack[i] + IRQ_STACK_SIZE);
 72         }
 73 }
 74 
 75 #ifdef CONFIG_DEBUG_STACKOVERFLOW
 76 static inline void check_stack_overflow(void)
 77 {
 78         unsigned long sp;
 79 
 80         __asm__ __volatile__("move %0, $sp" : "=r" (sp));
 81         sp &= THREAD_MASK;
 82 
 83         /*
 84          * Check for stack overflow: is there less than STACK_WARN free?
 85          * STACK_WARN is defined as 1/8 of THREAD_SIZE by default.
 86          */
 87         if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) {
 88                 printk("do_IRQ: stack overflow: %ld\n",
 89                        sp - sizeof(struct thread_info));
 90                 dump_stack();
 91         }
 92 }
 93 #else
 94 static inline void check_stack_overflow(void) {}
 95 #endif
 96 
 97 
 98 /*
 99  * do_IRQ handles all normal device IRQ's (the special
100  * SMP cross-CPU interrupts have their own specific
101  * handlers).
102  */
103 void __irq_entry do_IRQ(unsigned int irq)
104 {
105         irq_enter();
106         check_stack_overflow();
107         generic_handle_irq(irq);
108         irq_exit();
109 }
110 
111 #ifdef CONFIG_IRQ_DOMAIN
112 void __irq_entry do_domain_IRQ(struct irq_domain *domain, unsigned int hwirq)
113 {
114         irq_enter();
115         check_stack_overflow();
116         generic_handle_domain_irq(domain, hwirq);
117         irq_exit();
118 }
119 #endif
120 

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