虚假中断处理

Question

我正在使用带有xr17v358芯片的p2041进行串行interface.when，我正在运行我的测试应用程序，我正在显示禁用irq消息。在那之后，我在我的isr中添加了一些调试打印，所以我知道，即使我的卡没有生成中断，它也会连续调用isr，我只是想知道虚假中断。什么是虚假中断？在基于linux的系统中该如何处理？伪中断是硬件问题还是软件问题？如何了解虚假中断的来源？

Answer 1

我想在这里补充一些信息，手册中提到了虚假中断。

来自arm技术手册http://www.cl.cam.ac.uk/research/srg/han/ACS-P35/zynq/arm_gic_architecture_specification.pdf

1.4.4 Spurious interrupts

It is possible that an interrupt that the GIC has signaled to a processor is no longer required. If this happens, when
the processor acknowledges the interrupt, the GIC returns a special Interrupt ID that identifies the interrupt as a
spurious interrupt. Example reasons for spurious interrupts are:
• prior to the processor acknowledging an interrupt:
— software changes the priority of the interrupt
— software disables the interrupt
— software changes the processor that the interrupt targets
• for a 1-N interrupt, another target processor has previously acknowledged that interrupt.