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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 #ifdef CONFIG_KGDB
 29 int kgdb_early_setup;
 30 #endif
 31 
 32 static unsigned long irq_map[NR_IRQS / BITS_PER_LONG];
 33 
 34 int allocate_irqno(void)
 35 {
 36         int irq;
 37 
 38 again:
 39         irq = find_first_zero_bit(irq_map, NR_IRQS);
 40 
 41         if (irq >= NR_IRQS)
 42                 return -ENOSPC;
 43 
 44         if (test_and_set_bit(irq, irq_map))
 45                 goto again;
 46 
 47         return irq;
 48 }
 49 
 50 /*
 51  * Allocate the 16 legacy interrupts for i8259 devices.  This happens early
 52  * in the kernel initialization so treating allocation failure as BUG() is
 53  * ok.
 54  */
 55 void __init alloc_legacy_irqno(void)
 56 {
 57         int i;
 58 
 59         for (i = 0; i <= 16; i++)
 60                 BUG_ON(test_and_set_bit(i, irq_map));
 61 }
 62 
 63 void free_irqno(unsigned int irq)
 64 {
 65         smp_mb__before_atomic();
 66         clear_bit(irq, irq_map);
 67         smp_mb__after_atomic();
 68 }
 69 
 70 /*
 71  * 'what should we do if we get a hw irq event on an illegal vector'.
 72  * each architecture has to answer this themselves.
 73  */
 74 void ack_bad_irq(unsigned int irq)
 75 {
 76         printk("unexpected IRQ # %d\n", irq);
 77 }
 78 
 79 atomic_t irq_err_count;
 80 
 81 int arch_show_interrupts(struct seq_file *p, int prec)
 82 {
 83         seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
 84         return 0;
 85 }
 86 
 87 asmlinkage void spurious_interrupt(void)
 88 {
 89         atomic_inc(&irq_err_count);
 90 }
 91 
 92 void __init init_IRQ(void)
 93 {
 94         int i;
 95 
 96 #ifdef CONFIG_KGDB
 97         if (kgdb_early_setup)
 98                 return;
 99 #endif
100 
101         for (i = 0; i < NR_IRQS; i++)
102                 irq_set_noprobe(i);
103 
104         arch_init_irq();
105 
106 #ifdef CONFIG_KGDB
107         if (!kgdb_early_setup)
108                 kgdb_early_setup = 1;
109 #endif
110 }
111 
112 #ifdef CONFIG_DEBUG_STACKOVERFLOW
113 static inline void check_stack_overflow(void)
114 {
115         unsigned long sp;
116 
117         __asm__ __volatile__("move %0, $sp" : "=r" (sp));
118         sp &= THREAD_MASK;
119 
120         /*
121          * Check for stack overflow: is there less than STACK_WARN free?
122          * STACK_WARN is defined as 1/8 of THREAD_SIZE by default.
123          */
124         if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) {
125                 printk("do_IRQ: stack overflow: %ld\n",
126                        sp - sizeof(struct thread_info));
127                 dump_stack();
128         }
129 }
130 #else
131 static inline void check_stack_overflow(void) {}
132 #endif
133 
134 
135 /*
136  * do_IRQ handles all normal device IRQ's (the special
137  * SMP cross-CPU interrupts have their own specific
138  * handlers).
139  */
140 void __irq_entry do_IRQ(unsigned int irq)
141 {
142         irq_enter();
143         check_stack_overflow();
144         generic_handle_irq(irq);
145         irq_exit();
146 }
147 
148 

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