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121 lines
2.9 KiB
121 lines
2.9 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Based on arch/arm/kernel/irq.c |
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* |
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* Copyright (C) 1992 Linus Torvalds |
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* Modifications for ARM processor Copyright (C) 1995-2000 Russell King. |
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* Support for Dynamic Tick Timer Copyright (C) 2004-2005 Nokia Corporation. |
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* Dynamic Tick Timer written by Tony Lindgren <[email protected]> and |
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* Tuukka Tikkanen <[email protected]>. |
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* Copyright (C) 2012 ARM Ltd. |
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*/ |
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#include <linux/irq.h> |
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#include <linux/memory.h> |
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#include <linux/smp.h> |
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#include <linux/hardirq.h> |
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#include <linux/init.h> |
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#include <linux/irqchip.h> |
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#include <linux/kprobes.h> |
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#include <linux/scs.h> |
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#include <linux/seq_file.h> |
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#include <linux/vmalloc.h> |
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#include <asm/daifflags.h> |
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#include <asm/vmap_stack.h> |
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/* Only access this in an NMI enter/exit */ |
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DEFINE_PER_CPU(struct nmi_ctx, nmi_contexts); |
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DEFINE_PER_CPU(unsigned long *, irq_stack_ptr); |
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DECLARE_PER_CPU(unsigned long *, irq_shadow_call_stack_ptr); |
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#ifdef CONFIG_SHADOW_CALL_STACK |
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DEFINE_PER_CPU(unsigned long *, irq_shadow_call_stack_ptr); |
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#endif |
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static void init_irq_scs(void) |
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{ |
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int cpu; |
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if (!IS_ENABLED(CONFIG_SHADOW_CALL_STACK)) |
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return; |
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for_each_possible_cpu(cpu) |
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per_cpu(irq_shadow_call_stack_ptr, cpu) = |
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scs_alloc(cpu_to_node(cpu)); |
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} |
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#ifdef CONFIG_VMAP_STACK |
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static void init_irq_stacks(void) |
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{ |
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int cpu; |
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unsigned long *p; |
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for_each_possible_cpu(cpu) { |
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p = arch_alloc_vmap_stack(IRQ_STACK_SIZE, cpu_to_node(cpu)); |
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per_cpu(irq_stack_ptr, cpu) = p; |
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} |
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} |
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#else |
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/* irq stack only needs to be 16 byte aligned - not IRQ_STACK_SIZE aligned. */ |
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DEFINE_PER_CPU_ALIGNED(unsigned long [IRQ_STACK_SIZE/sizeof(long)], irq_stack); |
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static void init_irq_stacks(void) |
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{ |
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int cpu; |
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for_each_possible_cpu(cpu) |
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per_cpu(irq_stack_ptr, cpu) = per_cpu(irq_stack, cpu); |
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} |
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#endif |
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static void default_handle_irq(struct pt_regs *regs) |
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{ |
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panic("IRQ taken without a root IRQ handler\n"); |
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} |
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static void default_handle_fiq(struct pt_regs *regs) |
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{ |
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panic("FIQ taken without a root FIQ handler\n"); |
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} |
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void (*handle_arch_irq)(struct pt_regs *) __ro_after_init = default_handle_irq; |
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void (*handle_arch_fiq)(struct pt_regs *) __ro_after_init = default_handle_fiq; |
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int __init set_handle_irq(void (*handle_irq)(struct pt_regs *)) |
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{ |
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if (handle_arch_irq != default_handle_irq) |
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return -EBUSY; |
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handle_arch_irq = handle_irq; |
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pr_info("Root IRQ handler: %ps\n", handle_irq); |
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return 0; |
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} |
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int __init set_handle_fiq(void (*handle_fiq)(struct pt_regs *)) |
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{ |
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if (handle_arch_fiq != default_handle_fiq) |
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return -EBUSY; |
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handle_arch_fiq = handle_fiq; |
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pr_info("Root FIQ handler: %ps\n", handle_fiq); |
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return 0; |
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} |
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void __init init_IRQ(void) |
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{ |
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init_irq_stacks(); |
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init_irq_scs(); |
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irqchip_init(); |
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if (system_uses_irq_prio_masking()) { |
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/* |
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* Now that we have a stack for our IRQ handler, set |
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* the PMR/PSR pair to a consistent state. |
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*/ |
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WARN_ON(read_sysreg(daif) & PSR_A_BIT); |
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local_daif_restore(DAIF_PROCCTX_NOIRQ); |
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} |
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}
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