95 lines
2.5 KiB
C
95 lines
2.5 KiB
C
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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 <tony@atomide.com> and
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* Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>.
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* Copyright (C) 2012 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/kernel_stat.h>
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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/init.h>
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#include <linux/irqchip.h>
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#include <linux/seq_file.h>
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#include <linux/vmalloc.h>
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unsigned long irq_err_count;
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DEFINE_PER_CPU(unsigned long *, irq_stack_ptr);
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int arch_show_interrupts(struct seq_file *p, int prec)
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{
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show_ipi_list(p, prec);
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seq_printf(p, "%*s: %10lu\n", prec, "Err", irq_err_count);
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return 0;
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}
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void (*handle_arch_irq)(struct pt_regs *) = NULL;
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void __init set_handle_irq(void (*handle_irq)(struct pt_regs *))
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{
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if (handle_arch_irq)
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return;
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handle_arch_irq = handle_irq;
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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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/*
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* To ensure that VMAP'd stack overflow detection works
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* correctly, the IRQ stacks need to have the same
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* alignment as other stacks.
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*/
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p = __vmalloc_node_range(IRQ_STACK_SIZE, THREAD_ALIGN,
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VMALLOC_START, VMALLOC_END,
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THREADINFO_GFP, PAGE_KERNEL,
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0, cpu_to_node(cpu),
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__builtin_return_address(0));
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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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void __init init_IRQ(void)
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{
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init_irq_stacks();
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irqchip_init();
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if (!handle_arch_irq)
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panic("No interrupt controller found.");
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}
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