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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 | /* * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Code to handle x86 style IRQs plus some generic interrupt stuff. * * Copyright (C) 1992 Linus Torvalds * Copyright (C) 1994 - 2000 Ralf Baechle */ #include <linux/kernel.h> #include <linux/delay.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/kernel_stat.h> #include <linux/module.h> #include <linux/proc_fs.h> #include <linux/slab.h> #include <linux/mm.h> #include <linux/random.h> #include <linux/sched.h> #include <linux/seq_file.h> #include <linux/kallsyms.h> #include <asm/atomic.h> #include <asm/system.h> #include <asm/uaccess.h> static unsigned long irq_map[NR_IRQS / BITS_PER_LONG]; int allocate_irqno(void) { int irq; again: irq = find_first_zero_bit(irq_map, NR_IRQS); if (irq >= NR_IRQS) return -ENOSPC; if (test_and_set_bit(irq, irq_map)) goto again; return irq; } EXPORT_SYMBOL_GPL(allocate_irqno); /* * Allocate the 16 legacy interrupts for i8259 devices. This happens early * in the kernel initialization so treating allocation failure as BUG() is * ok. */ void __init alloc_legacy_irqno(void) { int i; for (i = 0; i <= 16; i++) BUG_ON(test_and_set_bit(i, irq_map)); } void free_irqno(unsigned int irq) { smp_mb__before_clear_bit(); clear_bit(irq, irq_map); smp_mb__after_clear_bit(); } EXPORT_SYMBOL_GPL(free_irqno); /* * 'what should we do if we get a hw irq event on an illegal vector'. * each architecture has to answer this themselves. */ void ack_bad_irq(unsigned int irq) { smtc_im_ack_irq(irq); printk("unexpected IRQ # %d\n", irq); } atomic_t irq_err_count; /* * Generic, controller-independent functions: */ int show_interrupts(struct seq_file *p, void *v) { int i = *(loff_t *) v, j; struct irqaction * action; unsigned long flags; if (i == 0) { seq_printf(p, " "); for_each_online_cpu(j) seq_printf(p, "CPU%d ", j); seq_putc(p, '\n'); } if (i < NR_IRQS) { spin_lock_irqsave(&irq_desc[i].lock, flags); action = irq_desc[i].action; if (!action) goto skip; seq_printf(p, "%3d: ", i); #ifndef CONFIG_SMP seq_printf(p, "%10u ", kstat_irqs(i)); #else for_each_online_cpu(j) seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]); #endif seq_printf(p, " %14s", irq_desc[i].chip->name); seq_printf(p, " %s", action->name); for (action=action->next; action; action = action->next) seq_printf(p, ", %s", action->name); seq_putc(p, '\n'); skip: spin_unlock_irqrestore(&irq_desc[i].lock, flags); } else if (i == NR_IRQS) { seq_putc(p, '\n'); seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count)); } return 0; } asmlinkage void spurious_interrupt(void) { atomic_inc(&irq_err_count); } #ifdef CONFIG_KGDB extern void breakpoint(void); extern void set_debug_traps(void); static int kgdb_flag = 1; static int __init nokgdb(char *str) { kgdb_flag = 0; return 1; } __setup("nokgdb", nokgdb); #endif void __init init_IRQ(void) { int i; for (i = 0; i < NR_IRQS; i++) set_irq_noprobe(i); arch_init_irq(); #ifdef CONFIG_KGDB if (kgdb_flag) { printk("Wait for gdb client connection ...\n"); set_debug_traps(); breakpoint(); } #endif } |