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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Based on arch/arm/kernel/irq.c
- *
- * Copyright (C) 1992 Linus Torvalds
- * Modifications for ARM processor Copyright (C) 1995-2000 Russell King.
- * Support for Dynamic Tick Timer Copyright (C) 2004-2005 Nokia Corporation.
- * Dynamic Tick Timer written by Tony Lindgren <tony@atomide.com> and
- * Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>.
- * Copyright (C) 2012 ARM Ltd.
- */
- #include <linux/irq.h>
- #include <linux/memory.h>
- #include <linux/smp.h>
- #include <linux/hardirq.h>
- #include <linux/init.h>
- #include <linux/irqchip.h>
- #include <linux/kprobes.h>
- #include <linux/scs.h>
- #include <linux/seq_file.h>
- #include <linux/vmalloc.h>
- #include <asm/daifflags.h>
- #include <asm/vmap_stack.h>
- /* Only access this in an NMI enter/exit */
- DEFINE_PER_CPU(struct nmi_ctx, nmi_contexts);
- DEFINE_PER_CPU(unsigned long *, irq_stack_ptr);
- DECLARE_PER_CPU(unsigned long *, irq_shadow_call_stack_ptr);
- #ifdef CONFIG_SHADOW_CALL_STACK
- DEFINE_PER_CPU(unsigned long *, irq_shadow_call_stack_ptr);
- #endif
- static void init_irq_scs(void)
- {
- int cpu;
- if (!IS_ENABLED(CONFIG_SHADOW_CALL_STACK))
- return;
- for_each_possible_cpu(cpu)
- per_cpu(irq_shadow_call_stack_ptr, cpu) =
- scs_alloc(cpu_to_node(cpu));
- }
- #ifdef CONFIG_VMAP_STACK
- static void init_irq_stacks(void)
- {
- int cpu;
- unsigned long *p;
- for_each_possible_cpu(cpu) {
- p = arch_alloc_vmap_stack(IRQ_STACK_SIZE, cpu_to_node(cpu));
- per_cpu(irq_stack_ptr, cpu) = p;
- }
- }
- #else
- /* irq stack only needs to be 16 byte aligned - not IRQ_STACK_SIZE aligned. */
- DEFINE_PER_CPU_ALIGNED(unsigned long [IRQ_STACK_SIZE/sizeof(long)], irq_stack);
- static void init_irq_stacks(void)
- {
- int cpu;
- for_each_possible_cpu(cpu)
- per_cpu(irq_stack_ptr, cpu) = per_cpu(irq_stack, cpu);
- }
- #endif
- void __init init_IRQ(void)
- {
- init_irq_stacks();
- init_irq_scs();
- irqchip_init();
- if (!handle_arch_irq)
- panic("No interrupt controller found.");
- if (system_uses_irq_prio_masking()) {
- /*
- * Now that we have a stack for our IRQ handler, set
- * the PMR/PSR pair to a consistent state.
- */
- WARN_ON(read_sysreg(daif) & PSR_A_BIT);
- local_daif_restore(DAIF_PROCCTX_NOIRQ);
- }
- }
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