2 * Based on arch/arm/kernel/irq.c
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.
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.
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.
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/>.
24 #include <linux/kernel_stat.h>
25 #include <linux/irq.h>
26 #include <linux/memory.h>
27 #include <linux/smp.h>
28 #include <linux/init.h>
29 #include <linux/irqchip.h>
30 #include <linux/seq_file.h>
31 #include <linux/vmalloc.h>
33 unsigned long irq_err_count;
35 /* Only access this in an NMI enter/exit */
36 DEFINE_PER_CPU(struct nmi_ctx, nmi_contexts);
38 DEFINE_PER_CPU(unsigned long *, irq_stack_ptr);
40 int arch_show_interrupts(struct seq_file *p, int prec)
42 show_ipi_list(p, prec);
43 seq_printf(p, "%*s: %10lu\n", prec, "Err", irq_err_count);
47 void (*handle_arch_irq)(struct pt_regs *) = NULL;
49 void __init set_handle_irq(void (*handle_irq)(struct pt_regs *))
54 handle_arch_irq = handle_irq;
57 #ifdef CONFIG_VMAP_STACK
58 static void init_irq_stacks(void)
63 for_each_possible_cpu(cpu) {
65 * To ensure that VMAP'd stack overflow detection works
66 * correctly, the IRQ stacks need to have the same
67 * alignment as other stacks.
69 p = __vmalloc_node_range(IRQ_STACK_SIZE, THREAD_ALIGN,
70 VMALLOC_START, VMALLOC_END,
71 THREADINFO_GFP, PAGE_KERNEL,
73 __builtin_return_address(0));
75 per_cpu(irq_stack_ptr, cpu) = p;
79 /* irq stack only needs to be 16 byte aligned - not IRQ_STACK_SIZE aligned. */
80 DEFINE_PER_CPU_ALIGNED(unsigned long [IRQ_STACK_SIZE/sizeof(long)], irq_stack);
82 static void init_irq_stacks(void)
86 for_each_possible_cpu(cpu)
87 per_cpu(irq_stack_ptr, cpu) = per_cpu(irq_stack, cpu);
91 void __init init_IRQ(void)
96 panic("No interrupt controller found.");