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 #ifdef CONFIG_MIPS_MT_SMTC 42 /* 43 * SMTC Kernel needs to manipulate low-level CPU interrupt mask 44 * in do_IRQ. These are passed in setup_irq_smtc() and stored 45 * in this table. 46 */ 47 unsigned long irq_hwmask[NR_IRQS]; 48 #endif /* CONFIG_MIPS_MT_SMTC */ 49 50 #undef do_IRQ 51 52 /* 53 * do_IRQ handles all normal device IRQ's (the special 54 * SMP cross-CPU interrupts have their own specific 55 * handlers). 56 */ 57 asmlinkage unsigned int do_IRQ(unsigned int irq, struct pt_regs *regs) 58 { 59 irq_enter(); 60 61 __DO_IRQ_SMTC_HOOK(); 62 __do_IRQ(irq, regs); 63 64 irq_exit(); 65 66 return 1; 67 } 68 69 /* 70 * Generic, controller-independent functions: 71 */ 72 73 int show_interrupts(struct seq_file *p, void *v) 74 { 75 int i = *(loff_t *) v, j; 76 struct irqaction * action; 77 unsigned long flags; 78 79 if (i == 0) { 80 seq_printf(p, " "); 81 for_each_online_cpu(j) 82 seq_printf(p, "CPU%d ",j); 83 seq_putc(p, '\n'); 84 } 85 86 if (i < NR_IRQS) { 87 spin_lock_irqsave(&irq_desc[i].lock, flags); 88 action = irq_desc[i].action; 89 if (!action) 90 goto skip; 91 seq_printf(p, "%3d: ",i); 92 #ifndef CONFIG_SMP 93 seq_printf(p, "%10u ", kstat_irqs(i)); 94 #else 95 for_each_online_cpu(j) 96 seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]); 97 #endif 98 seq_printf(p, " %14s", irq_desc[i].handler->typename); 99 seq_printf(p, " %s", action->name); 100 101 for (action=action->next; action; action = action->next) 102 seq_printf(p, ", %s", action->name); 103 104 seq_putc(p, '\n'); 105 skip: 106 spin_unlock_irqrestore(&irq_desc[i].lock, flags); 107 } else if (i == NR_IRQS) { 108 seq_putc(p, '\n'); 109 seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count)); 110 } 111 return 0; 112 } 113 114 asmlinkage void spurious_interrupt(struct pt_regs *regs) 115 { 116 atomic_inc(&irq_err_count); 117 } 118 119 #ifdef CONFIG_KGDB 120 extern void breakpoint(void); 121 extern void set_debug_traps(void); 122 123 static int kgdb_flag = 1; 124 static int __init nokgdb(char *str) 125 { 126 kgdb_flag = 0; 127 return 1; 128 } 129 __setup("nokgdb", nokgdb); 130 #endif 131 132 void __init init_IRQ(void) 133 { 134 int i; 135 136 for (i = 0; i < NR_IRQS; i++) { 137 irq_desc[i].status = IRQ_DISABLED; 138 irq_desc[i].action = NULL; 139 irq_desc[i].depth = 1; 140 irq_desc[i].handler = &no_irq_type; 141 spin_lock_init(&irq_desc[i].lock); 142 #ifdef CONFIG_MIPS_MT_SMTC 143 irq_hwmask[i] = 0; 144 #endif /* CONFIG_MIPS_MT_SMTC */ 145 } 146 147 arch_init_irq(); 148 149 #ifdef CONFIG_KGDB 150 if (kgdb_flag) { 151 printk("Wait for gdb client connection ...\n"); 152 set_debug_traps(); 153 breakpoint(); 154 } 155 #endif 156 } 157