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
  31 unsigned long irq_err_count;
  32
  33 /* irq stack only needs to be 16 byte aligned - not IRQ_STACK_SIZE aligned. */
  34 DEFINE_PER_CPU(unsigned long [IRQ_STACK_SIZE/sizeof(long)], irq_stack) __aligned(16);
  35
  36 int 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
  43 void (*handle_arch_irq)(struct pt_regs *) = NULL;
  44
  45 void __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
  53 void __init init_IRQ(void)
  54 {
  55         irqchip_init();
  56         if (!handle_arch_irq)
  57                 panic("No interrupt controller found.");
  58 }