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Can interrupt handler be interrupted?
However, such kernel control paths may be arbitrarily nested; an interrupt handler may be interrupted by another interrupt handler, thus giving raise to a nested execution of kernel threads.
Is a device driver an interrupt handler?
Interrupt handlers are initiated by hardware interrupts, software interrupt instructions, or software exceptions, and are used for implementing device drivers or transitions between protected modes of operation, such as system calls. The traditional form of interrupt handler is the hardware interrupt handler.
What are the goals of interrupt handler?
The job of the interrupt handler is to service the device and stop the device from interrupting. When the interrupt handler returns, the CPU resumes the work it was doing before the interrupt occurred.
How does the device driver handle an interrupt?
The Device driver’s usual probe function parses the Device tree data structure and reads the IRQ number and registers the handler using the register_irq function.
When do I install the interrupt handler on my Device?
The interrupt handler can be installed either at driver initialization or when the device is first opened. Although installing the interrupt handler from within the module’s initialization function might sound like a good idea, it often isn’t, especially if your device does not share interrupts.
How does the kernel know that the interrupt handler was for this particular device file?
Typically, a driver’s interrupt handler pushes or pulls data into “driver global” data areas from which/to which the process context end of the driver can transfer data. how does the kernel know that the interrupt handler was for this particular >device file?
When to use a pointer in an interrupt handler?
This pointer is used for shared interrupt lines. It is a unique identifier that is used when the interrupt line is freed and that may also be used by the driver to point to its own private data area (to identify which device is interrupting).