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The interrupt is a signal emitted by hardware or software when a process or an event needs immediate attention. It alerts the processor to a high-priority process requiring interruption of the current working process. In I/O devices one of the bus control lines is dedicated for this purpose and is called the Interrupt Service Routine (ISR).
When a device raises an interrupt at let’s say process i, the processor first completes the execution of instruction i. Then it loads the Program Counter (PC) with the address of the first instruction of the ...
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Interrupt handler - Wikipedia
In computer systems programming, an interrupt handler, also known as an interrupt service routine or ISR, is a special block of code associated with a specific interrupt condition. Interrupt handlers are initiated by hardware interrupts, software interrupt instructions, or software exceptions, and are used for … See more
Unlike other event handlers, interrupt handlers are expected to set interrupt flags to appropriate values as part of their core functionality.
Even in a CPU which … See moreIn a low-level microcontroller, the chip might lack protection modes and have no memory management unit (MMU). In these chips, the execution context of an interrupt handler will be essentially the same as the interrupted program, which typically runs on a … See more
In a modern operating system, upon entry the execution context of a hardware interrupt handler is subtle.
For reasons of performance, the handler will typically be initiated in the memory and execution context of the running process, to which it has no … See moreFor many reasons, it is highly desired that the interrupt handler execute as briefly as possible, and it is highly discouraged (or forbidden) for a … See more
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