85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
/*
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* Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
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*
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* This file contains the lowest level x86_64-specific interrupt
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* entry and irq statistics code. All the remaining irq logic is
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* done by the generic kernel/irq/ code and in the
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* x86_64-specific irq controller code. (e.g. i8259.c and
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* io_apic.c.)
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*/
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#include <linux/kernel_stat.h>
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#include <linux/interrupt.h>
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#include <linux/seq_file.h>
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/ftrace.h>
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#include <linux/uaccess.h>
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#include <linux/smp.h>
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#include <asm/io_apic.h>
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#include <asm/idle.h>
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#include <asm/apic.h>
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DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);
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EXPORT_PER_CPU_SYMBOL(irq_stat);
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DEFINE_PER_CPU(struct pt_regs *, irq_regs);
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EXPORT_PER_CPU_SYMBOL(irq_regs);
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/*
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* Probabilistic stack overflow check:
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*
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* Only check the stack in process context, because everything else
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* runs on the big interrupt stacks. Checking reliably is too expensive,
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* so we just check from interrupts.
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*/
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static inline void stack_overflow_check(struct pt_regs *regs)
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{
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#ifdef CONFIG_DEBUG_STACKOVERFLOW
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u64 curbase = (u64)task_stack_page(current);
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WARN_ONCE(regs->sp >= curbase &&
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regs->sp <= curbase + THREAD_SIZE &&
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regs->sp < curbase + sizeof(struct thread_info) +
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sizeof(struct pt_regs) + 128,
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"do_IRQ: %s near stack overflow (cur:%Lx,sp:%lx)\n",
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current->comm, curbase, regs->sp);
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#endif
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}
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bool handle_irq(unsigned irq, struct pt_regs *regs)
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{
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struct irq_desc *desc;
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stack_overflow_check(regs);
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desc = irq_to_desc(irq);
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if (unlikely(!desc))
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return false;
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generic_handle_irq_desc(irq, desc);
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return true;
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}
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extern void call_softirq(void);
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asmlinkage void do_softirq(void)
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{
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__u32 pending;
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unsigned long flags;
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if (in_interrupt())
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return;
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local_irq_save(flags);
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pending = local_softirq_pending();
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/* Switch to interrupt stack */
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if (pending) {
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call_softirq();
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WARN_ON_ONCE(softirq_count());
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}
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local_irq_restore(flags);
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}
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