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119 lines
2.6 KiB
119 lines
2.6 KiB
/* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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* |
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* Code to handle x86 style IRQs plus some generic interrupt stuff. |
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* |
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* Copyright (C) 1992 Linus Torvalds |
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* Copyright (C) 1994 - 2000 Ralf Baechle |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/delay.h> |
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#include <linux/init.h> |
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#include <linux/interrupt.h> |
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#include <linux/kernel_stat.h> |
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#include <linux/proc_fs.h> |
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#include <linux/mm.h> |
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#include <linux/random.h> |
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#include <linux/sched.h> |
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#include <linux/seq_file.h> |
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#include <linux/kallsyms.h> |
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#include <linux/kgdb.h> |
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#include <linux/ftrace.h> |
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#include <linux/irqdomain.h> |
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#include <linux/atomic.h> |
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#include <linux/uaccess.h> |
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void *irq_stack[NR_CPUS]; |
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/* |
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* 'what should we do if we get a hw irq event on an illegal vector'. |
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* each architecture has to answer this themselves. |
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*/ |
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void ack_bad_irq(unsigned int irq) |
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{ |
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printk("unexpected IRQ # %d\n", irq); |
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} |
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atomic_t irq_err_count; |
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int arch_show_interrupts(struct seq_file *p, int prec) |
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{ |
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seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count)); |
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return 0; |
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} |
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asmlinkage void spurious_interrupt(void) |
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{ |
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atomic_inc(&irq_err_count); |
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} |
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void __init init_IRQ(void) |
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{ |
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int i; |
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unsigned int order = get_order(IRQ_STACK_SIZE); |
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for (i = 0; i < NR_IRQS; i++) |
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irq_set_noprobe(i); |
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if (cpu_has_veic) |
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clear_c0_status(ST0_IM); |
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arch_init_irq(); |
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for_each_possible_cpu(i) { |
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void *s = (void *)__get_free_pages(GFP_KERNEL, order); |
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irq_stack[i] = s; |
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pr_debug("CPU%d IRQ stack at 0x%p - 0x%p\n", i, |
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irq_stack[i], irq_stack[i] + IRQ_STACK_SIZE); |
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} |
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} |
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#ifdef CONFIG_DEBUG_STACKOVERFLOW |
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static inline void check_stack_overflow(void) |
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{ |
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unsigned long sp; |
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__asm__ __volatile__("move %0, $sp" : "=r" (sp)); |
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sp &= THREAD_MASK; |
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/* |
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* Check for stack overflow: is there less than STACK_WARN free? |
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* STACK_WARN is defined as 1/8 of THREAD_SIZE by default. |
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*/ |
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if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) { |
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printk("do_IRQ: stack overflow: %ld\n", |
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sp - sizeof(struct thread_info)); |
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dump_stack(); |
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} |
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} |
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#else |
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static inline void check_stack_overflow(void) {} |
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#endif |
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/* |
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* do_IRQ handles all normal device IRQ's (the special |
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* SMP cross-CPU interrupts have their own specific |
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* handlers). |
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*/ |
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void __irq_entry do_IRQ(unsigned int irq) |
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{ |
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irq_enter(); |
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check_stack_overflow(); |
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generic_handle_irq(irq); |
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irq_exit(); |
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} |
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#ifdef CONFIG_IRQ_DOMAIN |
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void __irq_entry do_domain_IRQ(struct irq_domain *domain, unsigned int hwirq) |
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{ |
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irq_enter(); |
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check_stack_overflow(); |
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generic_handle_domain_irq(domain, hwirq); |
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irq_exit(); |
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} |
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#endif
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