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/module.h> 17 #include <linux/proc_fs.h> 18 #include <linux/slab.h> 19 #include <linux/mm.h> 20 #include <linux/random.h> 21 #include <linux/sched.h> 22 #include <linux/seq_file.h> 23 #include <linux/kallsyms.h> 24 25 #include <asm/atomic.h> 26 #include <asm/system.h> 27 #include <asm/uaccess.h> 28 29 /* 30 * 'what should we do if we get a hw irq event on an illegal vector'. 31 * each architecture has to answer this themselves. 32 */ 33 void ack_bad_irq(unsigned int irq) 34 { 35 printk("unexpected IRQ # %d\n", irq); 36 } 37 38 atomic_t irq_err_count; 39 40 #ifdef CONFIG_MIPS_MT_SMTC 41 /* 42 * SMTC Kernel needs to manipulate low-level CPU interrupt mask 43 * in do_IRQ. These are passed in setup_irq_smtc() and stored 44 * in this table. 45 */ 46 unsigned long irq_hwmask[NR_IRQS]; 47 #endif /* CONFIG_MIPS_MT_SMTC */ 48 49 #undef do_IRQ 50 51 /* 52 * do_IRQ handles all normal device IRQ's (the special 53 * SMP cross-CPU interrupts have their own specific 54 * handlers). 55 */ 56 asmlinkage unsigned int do_IRQ(unsigned int irq, struct pt_regs *regs) 57 { 58 irq_enter(); 59 60 __DO_IRQ_SMTC_HOOK(); 61 __do_IRQ(irq, regs); 62 63 irq_exit(); 64 65 return 1; 66 } 67 68 /* 69 * Generic, controller-independent functions: 70 */ 71 72 int show_interrupts(struct seq_file *p, void *v) 73 { 74 int i = *(loff_t *) v, j; 75 struct irqaction * action; 76 unsigned long flags; 77 78 if (i == 0) { 79 seq_printf(p, " "); 80 for_each_online_cpu(j) 81 seq_printf(p, "CPU%d ",j); 82 seq_putc(p, '\n'); 83 } 84 85 if (i < NR_IRQS) { 86 spin_lock_irqsave(&irq_desc[i].lock, flags); 87 action = irq_desc[i].action; 88 if (!action) 89 goto skip; 90 seq_printf(p, "%3d: ",i); 91 #ifndef CONFIG_SMP 92 seq_printf(p, "%10u ", kstat_irqs(i)); 93 #else 94 for_each_online_cpu(j) 95 seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]); 96 #endif 97 seq_printf(p, " %14s", irq_desc[i].chip->typename); 98 seq_printf(p, " %s", action->name); 99 100 for (action=action->next; action; action = action->next) 101 seq_printf(p, ", %s", action->name); 102 103 seq_putc(p, '\n'); 104 skip: 105 spin_unlock_irqrestore(&irq_desc[i].lock, flags); 106 } else if (i == NR_IRQS) { 107 seq_putc(p, '\n'); 108 seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count)); 109 } 110 return 0; 111 } 112 113 asmlinkage void spurious_interrupt(struct pt_regs *regs) 114 { 115 atomic_inc(&irq_err_count); 116 } 117 118 #ifdef CONFIG_KGDB 119 extern void breakpoint(void); 120 extern void set_debug_traps(void); 121 122 static int kgdb_flag = 1; 123 static int __init nokgdb(char *str) 124 { 125 kgdb_flag = 0; 126 return 1; 127 } 128 __setup("nokgdb", nokgdb); 129 #endif 130 131 void __init init_IRQ(void) 132 { 133 int i; 134 135 for (i = 0; i < NR_IRQS; i++) { 136 irq_desc[i].status = IRQ_DISABLED; 137 irq_desc[i].action = NULL; 138 irq_desc[i].depth = 1; 139 irq_desc[i].chip = &no_irq_chip; 140 spin_lock_init(&irq_desc[i].lock); 141 #ifdef CONFIG_MIPS_MT_SMTC 142 irq_hwmask[i] = 0; 143 #endif /* CONFIG_MIPS_MT_SMTC */ 144 } 145 146 arch_init_irq(); 147 148 #ifdef CONFIG_KGDB 149 if (kgdb_flag) { 150 printk("Wait for gdb client connection ...\n"); 151 set_debug_traps(); 152 breakpoint(); 153 } 154 #endif 155 } 156