/* * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Code to handle x86 style IRQs plus some generic interrupt stuff. * * Copyright (C) 1992 Linus Torvalds * Copyright (C) 1994 - 2000 Ralf Baechle */ #include <linux/kernel.h> #include <linux/delay.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/kernel_stat.h> #include <linux/module.h> #include <linux/proc_fs.h> #include <linux/slab.h> #include <linux/mm.h> #include <linux/random.h> #include <linux/sched.h> #include <linux/seq_file.h> #include <linux/kallsyms.h> #include <asm/atomic.h> #include <asm/system.h> #include <asm/uaccess.h> static unsigned long irq_map[NR_IRQS / BITS_PER_LONG]; int allocate_irqno(void) { int irq; again: irq = find_first_zero_bit(irq_map, NR_IRQS); if (irq >= NR_IRQS) return -ENOSPC; if (test_and_set_bit(irq, irq_map)) goto again; return irq; } EXPORT_SYMBOL_GPL(allocate_irqno); /* * Allocate the 16 legacy interrupts for i8259 devices. This happens early * in the kernel initialization so treating allocation failure as BUG() is * ok. */ void __init alloc_legacy_irqno(void) { int i; for (i = 0; i <= 16; i++) BUG_ON(test_and_set_bit(i, irq_map)); } void free_irqno(unsigned int irq) { smp_mb__before_clear_bit(); clear_bit(irq, irq_map); smp_mb__after_clear_bit(); } EXPORT_SYMBOL_GPL(free_irqno); /* * 'what should we do if we get a hw irq event on an illegal vector'. * each architecture has to answer this themselves. */ void ack_bad_irq(unsigned int irq) { smtc_im_ack_irq(irq); printk("unexpected IRQ # %d\n", irq); } atomic_t irq_err_count; /* * Generic, controller-independent functions: */ int show_interrupts(struct seq_file *p, void *v) { int i = *(loff_t *) v, j; struct irqaction * action; unsigned long flags; if (i == 0) { seq_printf(p, " "); for_each_online_cpu(j) seq_printf(p, "CPU%d ",j); seq_putc(p, '\n'); } if (i < NR_IRQS) { spin_lock_irqsave(&irq_desc[i].lock, flags); action = irq_desc[i].action; if (!action) goto skip; seq_printf(p, "%3d: ",i); #ifndef CONFIG_SMP seq_printf(p, "%10u ", kstat_irqs(i)); #else for_each_online_cpu(j) seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]); #endif seq_printf(p, " %14s", irq_desc[i].chip->name); seq_printf(p, " %s", action->name); for (action=action->next; action; action = action->next) seq_printf(p, ", %s", action->name); seq_putc(p, '\n'); skip: spin_unlock_irqrestore(&irq_desc[i].lock, flags); } else if (i == NR_IRQS) { seq_putc(p, '\n'); seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count)); } return 0; } asmlinkage void spurious_interrupt(void) { atomic_inc(&irq_err_count); } #ifdef CONFIG_KGDB extern void breakpoint(void); extern void set_debug_traps(void); static int kgdb_flag = 1; static int __init nokgdb(char *str) { kgdb_flag = 0; return 1; } __setup("nokgdb", nokgdb); #endif void __init init_IRQ(void) { arch_init_irq(); #ifdef CONFIG_KGDB if (kgdb_flag) { printk("Wait for gdb client connection ...\n"); set_debug_traps(); breakpoint(); } #endif }