Linux 内核有方便直观的办法看到 local cpu 的中断是否被关闭了吗? - V2EX
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huangya
V2EX    Linux

Linux 内核有方便直观的办法看到 local cpu 的中断是否被关闭了吗?

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  •   huangya Jul 20, 2023 1618 views
    This topic created in 1036 days ago, the information mentioned may be changed or developed.

    我的理解是当 cpu 在响应中断的时候,cpu 会自动把中断关闭。这个动作是硬件自己做的,无需软件参与。 参考: 1.https://cloud.tencent.com/developer/article/1517851?from=15425

    2.https://stackoverflow.com/questions/14295403/should-my-interrupt-handler-disable-interrupts-or-does-the-arm-processor-do-it-a

    我想验证这个,我想在任意一个 driver 处理中断的函数中看下当前运行的这个 cpu core 确实把中断关闭了。有什么现成的函数或者接口吗?或者需要用体系结构相关的汇编代码 dump 相关寄存器?有 arm 的办法最好。

    4 replies    2023-07-21 10:17:03 +08:00
    Kumo31
        1
    Kumo31  
       Jul 20, 2023
    用 qemu 调试内核
    huangya
        2
    huangya  
    OP
       Jul 20, 2023
    @Kumo31 你的意思是在 qemu 里面 dump 相关寄存器吧?嗯,这是个办法。
    adadada
        3
    adadada  
       span class="ago" title="2023-07-20 23:34:57 +08:00">Jul 20, 2023   1
    能自己改 kernel 的话,直接调用 irqs_disabled()
    huangya
        4
    huangya  
    OP
       Jul 21, 2023
    @adadada 我在中断处理加了这个函数(假设用 request_irq 申请的中断,在 handler 里面加的),确实是返回 1 。
    request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
    const char *name, void *dev)
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