LXR linux/arch/arm64/kernel/irq.c

   1/*
   2 * Based on arch/arm/kernel/irq.c
   3 *
   4 * Copyright (C) 1992 Linus Torvalds
   5 * Modifications for ARM processor Copyright (C) 1995-2000 Russell King.
   6 * Support for Dynamic Tick Timer Copyright (C) 2004-2005 Nokia Corporation.
   7 * Dynamic Tick Timer written by Tony Lindgren <tony@atomide.com> and
   8 * Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>.
   9 * Copyright (C) 2012 ARM Ltd.
  10 *
  11 * This program is free software; you can redistribute it and/or modify
  12 * it under the terms of the GNU General Public License version 2 as
  13 * published by the Free Software Foundation.
  14 *
  15 * This program is distributed in the hope that it will be useful,
  16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 * GNU General Public License for more details.
  19 *
  20 * You should have received a copy of the GNU General Public License
  21 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24#include <linux/kernel_stat.h>
  25#include <linux/irq.h>
  26#include <linux/smp.h>
  27#include <linux/init.h>
  28#include <linux/irqchip.h>
  29#include <linux/seq_file.h>
  30
  31unsigned long irq_err_count;
  32
  33/* irq stack only needs to be 16 byte aligned - not IRQ_STACK_SIZE aligned. */
  34DEFINE_PER_CPU(unsigned long [IRQ_STACK_SIZE/sizeof(long)], irq_stack) __aligned(16);
  35
  36int arch_show_interrupts(struct seq_file *p, int prec)
  37{
  38        show_ipi_list(p, prec);
  39        seq_printf(p, "%*s: %10lu\n", prec, "Err", irq_err_count);
  40        return 0;
  41}
  42
  43void (*handle_arch_irq)(struct pt_regs *) = NULL;
  44
  45void __init set_handle_irq(void (*handle_irq)(struct pt_regs *))
  46{
  47        if (handle_arch_irq)
  48                return;
  49
  50        handle_arch_irq = handle_irq;
  51}
  52
  53void __init init_IRQ(void)
  54{
  55        irqchip_init();
  56        if (!handle_arch_irq)
  57                panic("No interrupt controller found.");
  58}
  59