1 // SPDX-License-Identifier: GPL-2.0-only
3 * Based on arch/arm/kernel/irq.c
5 * Copyright (C) 1992 Linus Torvalds
6 * Modifications for ARM processor Copyright (C) 1995-2000 Russell King.
7 * Support for Dynamic Tick Timer Copyright (C) 2004-2005 Nokia Corporation.
8 * Dynamic Tick Timer written by Tony Lindgren <tony@atomide.com> and
9 * Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>.
10 * Copyright (C) 2012 ARM Ltd.
13 #include <linux/irq.h>
14 #include <linux/memory.h>
15 #include <linux/smp.h>
16 #include <linux/hardirq.h>
17 #include <linux/init.h>
18 #include <linux/irqchip.h>
19 #include <linux/kprobes.h>
20 #include <linux/seq_file.h>
21 #include <linux/vmalloc.h>
22 #include <asm/daifflags.h>
23 #include <asm/vmap_stack.h>
25 /* Only access this in an NMI enter/exit */
26 DEFINE_PER_CPU(struct nmi_ctx, nmi_contexts);
28 DEFINE_PER_CPU(unsigned long *, irq_stack_ptr);
30 #ifdef CONFIG_VMAP_STACK
31 static void init_irq_stacks(void)
36 for_each_possible_cpu(cpu) {
37 p = arch_alloc_vmap_stack(IRQ_STACK_SIZE, cpu_to_node(cpu));
38 per_cpu(irq_stack_ptr, cpu) = p;
42 /* irq stack only needs to be 16 byte aligned - not IRQ_STACK_SIZE aligned. */
43 DEFINE_PER_CPU_ALIGNED(unsigned long [IRQ_STACK_SIZE/sizeof(long)], irq_stack);
45 static void init_irq_stacks(void)
49 for_each_possible_cpu(cpu)
50 per_cpu(irq_stack_ptr, cpu) = per_cpu(irq_stack, cpu);
54 void __init init_IRQ(void)
59 panic("No interrupt controller found.");
61 if (system_uses_irq_prio_masking()) {
63 * Now that we have a stack for our IRQ handler, set
64 * the PMR/PSR pair to a consistent state.
66 WARN_ON(read_sysreg(daif) & PSR_A_BIT);
67 local_daif_restore(DAIF_PROCCTX_NOIRQ);