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There are a number of common ways of acknowledging an interrupt has completed when an EOI is issued. These include specifying which interrupt completed, using an implied interrupt which has completed (usually the highest priority pending in the ISR), and treating interrupt acknowledgement as the EOI.
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PICs typically have a common set of registers: interrupt request register (IRR), in-service register (ISR), and interrupt mask register (IMR). The IRR specifies which interrupts are pending acknowledgement, and is typically a symbolic register which can not be directly accessed. The ISR register
295:(EOI). The IMR specifies which interrupts are to be ignored and not acknowledged. A simple register schema such as this allows up to two distinct interrupt requests to be outstanding at one time, one waiting for acknowledgement, and one waiting for EOI.
274:(ISR) after the PIC assesses the IRQs' relative priorities. Common modes of interrupt priority include hard priorities, rotating priorities, and cascading priorities. PICs often allow mapping input to outputs in a configurable way. On the
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There are a number of common priority schemas in PICs including hard priorities, specific priorities, and rotating priorities.
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PC. In modern times, this is not included as a separate chip in an x86 PC, but rather as part of the motherboard's
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IA-32 Intel
Architecture Software Developer's Manual, Volume 3A: System Programming Guide, Part 1, Chapter 10
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specifies which interrupts have been acknowledged, but are still waiting for an
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whose internal architecture is defined by the chipset vendor's standards.
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which support more interrupt outputs and more flexible priority schemas.
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Architecture Software Developer's Manual, Volume 3A
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chipset. In other cases, it has been replaced by the newer
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More information on the Intel APIC can be found in the
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https://www.intel.com/Assets/PDF/datasheet/290562.pdf
412:"A Revisitation of Kernel Synchronization Schemes"
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335:Advanced Programmable Interrupt Controllers
60:Learn how and when to remove these messages
16:Integrated circuit that handles interrupts
230:Learn how and when to remove this message
212:Learn how and when to remove this message
175:This article includes a list of general
89:Relevant discussion may be found on the
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