157 lines
3.3 KiB
C
157 lines
3.3 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Code to handle x86 style IRQs plus some generic interrupt stuff.
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*
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* Copyright (C) 1992 Linus Torvalds
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* Copyright (C) 1994 - 2000 Ralf Baechle
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*/
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#include <linux/config.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/kernel_stat.h>
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#include <linux/module.h>
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#include <linux/proc_fs.h>
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#include <linux/slab.h>
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#include <linux/mm.h>
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#include <linux/random.h>
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#include <linux/sched.h>
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#include <linux/seq_file.h>
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#include <linux/kallsyms.h>
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#include <asm/atomic.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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/*
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* 'what should we do if we get a hw irq event on an illegal vector'.
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* each architecture has to answer this themselves.
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*/
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void ack_bad_irq(unsigned int irq)
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{
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printk("unexpected IRQ # %d\n", irq);
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}
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atomic_t irq_err_count;
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#ifdef CONFIG_MIPS_MT_SMTC
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/*
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* SMTC Kernel needs to manipulate low-level CPU interrupt mask
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* in do_IRQ. These are passed in setup_irq_smtc() and stored
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* in this table.
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*/
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unsigned long irq_hwmask[NR_IRQS];
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#endif /* CONFIG_MIPS_MT_SMTC */
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#undef do_IRQ
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/*
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* do_IRQ handles all normal device IRQ's (the special
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* SMP cross-CPU interrupts have their own specific
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* handlers).
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*/
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asmlinkage unsigned int do_IRQ(unsigned int irq, struct pt_regs *regs)
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{
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irq_enter();
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__DO_IRQ_SMTC_HOOK();
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__do_IRQ(irq, regs);
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irq_exit();
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return 1;
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}
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/*
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* Generic, controller-independent functions:
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*/
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int show_interrupts(struct seq_file *p, void *v)
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{
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int i = *(loff_t *) v, j;
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struct irqaction * action;
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unsigned long flags;
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if (i == 0) {
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seq_printf(p, " ");
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for_each_online_cpu(j)
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seq_printf(p, "CPU%d ",j);
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seq_putc(p, '\n');
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}
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if (i < NR_IRQS) {
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spin_lock_irqsave(&irq_desc[i].lock, flags);
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action = irq_desc[i].action;
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if (!action)
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goto skip;
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seq_printf(p, "%3d: ",i);
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#ifndef CONFIG_SMP
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seq_printf(p, "%10u ", kstat_irqs(i));
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#else
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for_each_online_cpu(j)
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seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
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#endif
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seq_printf(p, " %14s", irq_desc[i].handler->typename);
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seq_printf(p, " %s", action->name);
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for (action=action->next; action; action = action->next)
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seq_printf(p, ", %s", action->name);
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seq_putc(p, '\n');
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skip:
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spin_unlock_irqrestore(&irq_desc[i].lock, flags);
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} else if (i == NR_IRQS) {
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seq_putc(p, '\n');
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seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
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}
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return 0;
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}
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asmlinkage void spurious_interrupt(struct pt_regs *regs)
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{
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atomic_inc(&irq_err_count);
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}
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#ifdef CONFIG_KGDB
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extern void breakpoint(void);
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extern void set_debug_traps(void);
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static int kgdb_flag = 1;
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static int __init nokgdb(char *str)
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{
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kgdb_flag = 0;
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return 1;
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}
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__setup("nokgdb", nokgdb);
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#endif
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void __init init_IRQ(void)
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{
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int i;
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for (i = 0; i < NR_IRQS; i++) {
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irq_desc[i].status = IRQ_DISABLED;
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irq_desc[i].action = NULL;
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irq_desc[i].depth = 1;
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irq_desc[i].handler = &no_irq_type;
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spin_lock_init(&irq_desc[i].lock);
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#ifdef CONFIG_MIPS_MT_SMTC
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irq_hwmask[i] = 0;
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#endif /* CONFIG_MIPS_MT_SMTC */
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}
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arch_init_irq();
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#ifdef CONFIG_KGDB
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if (kgdb_flag) {
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printk("Wait for gdb client connection ...\n");
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set_debug_traps();
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breakpoint();
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}
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#endif
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}
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