x86/xen: resume timer irqs early
[linux/fpc-iii.git] / arch / arm64 / kernel / irq.c
blobecb3354292ed2af479aa7d3df33c1d3100dfdd4e
1 /*
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/smp.h>
27 #include <linux/init.h>
28 #include <linux/irqchip.h>
29 #include <linux/seq_file.h>
30 #include <linux/ratelimit.h>
32 unsigned long irq_err_count;
34 int arch_show_interrupts(struct seq_file *p, int prec)
36 #ifdef CONFIG_SMP
37 show_ipi_list(p, prec);
38 #endif
39 seq_printf(p, "%*s: %10lu\n", prec, "Err", irq_err_count);
40 return 0;
44 * handle_IRQ handles all hardware IRQ's. Decoded IRQs should
45 * not come via this function. Instead, they should provide their
46 * own 'handler'. Used by platform code implementing C-based 1st
47 * level decoding.
49 void handle_IRQ(unsigned int irq, struct pt_regs *regs)
51 struct pt_regs *old_regs = set_irq_regs(regs);
53 irq_enter();
56 * Some hardware gives randomly wrong interrupts. Rather
57 * than crashing, do something sensible.
59 if (unlikely(irq >= nr_irqs)) {
60 pr_warn_ratelimited("Bad IRQ%u\n", irq);
61 ack_bad_irq(irq);
62 } else {
63 generic_handle_irq(irq);
66 irq_exit();
67 set_irq_regs(old_regs);
70 void __init set_handle_irq(void (*handle_irq)(struct pt_regs *))
72 if (handle_arch_irq)
73 return;
75 handle_arch_irq = handle_irq;
78 void __init init_IRQ(void)
80 irqchip_init();
81 if (!handle_arch_irq)
82 panic("No interrupt controller found.");