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/config.h> 12 #include <linux/kernel.h> 13 #include <linux/delay.h> 14 #include <linux/init.h> 15 #include <linux/interrupt.h> 16 #include <linux/kernel_stat.h> 17 #include <linux/module.h> 18 #include <linux/proc_fs.h> 19 #include <linux/slab.h> 20 #include <linux/mm.h> 21 #include <linux/random.h> 22 #include <linux/sched.h> 23 #include <linux/seq_file.h> 24 #include <linux/kallsyms.h> 25 26 #include <asm/atomic.h> 27 #include <asm/system.h> 28 #include <asm/uaccess.h> 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 #undef do_IRQ 42 43 /* 44 * do_IRQ handles all normal device IRQ's (the special 45 * SMP cross-CPU interrupts have their own specific 46 * handlers). 47 */ 48 asmlinkage unsigned int do_IRQ(unsigned int irq, struct pt_regs *regs) 49 { 50 irq_enter(); 51 52 __do_IRQ(irq, regs); 53 54 irq_exit(); 55 56 return 1; 57 } 58 59 /* 60 * Generic, controller-independent functions: 61 */ 62 63 int show_interrupts(struct seq_file *p, void *v) 64 { 65 int i = *(loff_t *) v, j; 66 struct irqaction * action; 67 unsigned long flags; 68 69 if (i == 0) { 70 seq_printf(p, " "); 71 for_each_online_cpu(j) 72 seq_printf(p, "CPU%d ",j); 73 seq_putc(p, '\n'); 74 } 75 76 if (i < NR_IRQS) { 77 spin_lock_irqsave(&irq_desc[i].lock, flags); 78 action = irq_desc[i].action; 79 if (!action) 80 goto skip; 81 seq_printf(p, "%3d: ",i); 82 #ifndef CONFIG_SMP 83 seq_printf(p, "%10u ", kstat_irqs(i)); 84 #else 85 for_each_online_cpu(j) 86 seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]); 87 #endif 88 seq_printf(p, " %14s", irq_desc[i].handler->typename); 89 seq_printf(p, " %s", action->name); 90 91 for (action=action->next; action; action = action->next) 92 seq_printf(p, ", %s", action->name); 93 94 seq_putc(p, '\n'); 95 skip: 96 spin_unlock_irqrestore(&irq_desc[i].lock, flags); 97 } else if (i == NR_IRQS) { 98 seq_putc(p, '\n'); 99 seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count)); 100 } 101 return 0; 102 } 103 104 #ifdef CONFIG_KGDB 105 extern void breakpoint(void); 106 extern void set_debug_traps(void); 107 108 static int kgdb_flag = 1; 109 static int __init nokgdb(char *str) 110 { 111 kgdb_flag = 0; 112 return 1; 113 } 114 __setup("nokgdb", nokgdb); 115 #endif 116 117 void __init init_IRQ(void) 118 { 119 int i; 120 121 for (i = 0; i < NR_IRQS; i++) { 122 irq_desc[i].status = IRQ_DISABLED; 123 irq_desc[i].action = NULL; 124 irq_desc[i].depth = 1; 125 irq_desc[i].handler = &no_irq_type; 126 spin_lock_init(&irq_desc[i].lock); 127 } 128 129 arch_init_irq(); 130 131 #ifdef CONFIG_KGDB 132 if (kgdb_flag) { 133 printk("Wait for gdb client connection ...\n"); 134 set_debug_traps(); 135 breakpoint(); 136 } 137 #endif 138 } 139