I just know that Interrupt is a hardware signal assertion caused in a processor pin. But I would like to know how Linux OS handles it. What all are the things that happen when an interrupt occurs?

Oct 5, 2024 · But unfortunately, if the exception happens in atomic context (like interrupt or softirq), the action taken is always Kernel Panic (with description "Fatal exception in interrupt") …

A hardware interrupt is not really part of CPU multitasking, but may drive it. Hardware interrupts are issued by hardware devices like disk, network cards, keyboards, clocks, etc. Each device …

Dec 1, 2024 · From the paragraph The internals of interrupt handling on the x86 (page 11 of the link above): The first thing do_IRQ does is to acknowledge the interrupt so that the interrupt …

Apr 29, 2019 · At boot time, when the firmware hands over the control of the system to the kernel, initially just one CPU core is running. The first core (usually core #0, sometimes called the …

When your interrupt handler tells the kernel it handled the interrupt, that doesn't stop the kernel from continuing to call any other handlers registered for that same interrupt. This is …

Sep 15, 2022 · Apart from interrupt handling that you already understood, this concept is only known in the context of multiprocessing since in the case of single processing… there is …

Feb 21, 2020 · Usually, interrupt handlers are designed to be as short as possible, and the actual handling code is called in a process-like context. The handler just determines the source, adds …

Nov 5, 2019 · The Linux timer interrupt handler doesn’t do all that much directly. For x86, you’ll find the default PIT/HPET timer interrupt handler in arch/x86/kernel/time.c:

Dec 30, 2018 · There is one interrupt stack per CPU. If the interrupt happens when running in user mode, actually two stack switches occur: first from the user stack to the kernel stack for …