Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Ralf Baechle | 41c594a | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Ralf Baechle | 41c594a | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 60 | __DO_IRQ_SMTC_HOOK(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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, " "); |
Andrew Morton | 394e390 | 2006-03-23 03:01:05 -0800 | [diff] [blame] | 80 | for_each_online_cpu(j) |
| 81 | seq_printf(p, "CPU%d ",j); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Ralf Baechle | 42a3b4f | 2005-09-03 15:56:17 -0700 | [diff] [blame] | 88 | if (!action) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | goto skip; |
| 90 | seq_printf(p, "%3d: ",i); |
| 91 | #ifndef CONFIG_SMP |
| 92 | seq_printf(p, "%10u ", kstat_irqs(i)); |
| 93 | #else |
Andrew Morton | 394e390 | 2006-03-23 03:01:05 -0800 | [diff] [blame] | 94 | for_each_online_cpu(j) |
| 95 | seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | #endif |
Ingo Molnar | d1bef4e | 2006-06-29 02:24:36 -0700 | [diff] [blame] | 97 | seq_printf(p, " %14s", irq_desc[i].chip->typename); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Ralf Baechle | 93373ed | 2006-04-01 21:17:45 +0100 | [diff] [blame] | 113 | asmlinkage void spurious_interrupt(struct pt_regs *regs) |
| 114 | { |
| 115 | atomic_inc(&irq_err_count); |
| 116 | } |
| 117 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Ingo Molnar | d1bef4e | 2006-06-29 02:24:36 -0700 | [diff] [blame] | 139 | irq_desc[i].chip = &no_irq_type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | spin_lock_init(&irq_desc[i].lock); |
Ralf Baechle | 41c594a | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 141 | #ifdef CONFIG_MIPS_MT_SMTC |
| 142 | irq_hwmask[i] = 0; |
| 143 | #endif /* CONFIG_MIPS_MT_SMTC */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |