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Generic Interrupt Controller versions 3 and 4: Difference between revisions
Generic Interrupt Controller versions 3 and 4 (view source)
Revision as of 03:38, 3 January 2017
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= Introduction =
This page seeks to give a quick reference to the behaviour of the version 3 and 4 GIC, especially relative to version 2. It heavily references [User:Gravaera/Generic Interrrupt Controller], and recommends that page as prior reading.
Version 3 of the GIC specification is no longer separate from the core ARM specification, but as of version 3, the GICv3 is part of the architectural state of the ARM architecture, from '''ARMv8 and onward'''. In particular, from ARMv8 onwards, access to the GICC_*, GICV_* and GICH_* groups of registers are provided as ARM architected system registers, and not only as memory-mapped registers. In other words, they are accessible as ARM coprocessors.
On an ARMv7 platform, the GIC is an extension that is not architecturally specified. On ARMv8 platforms, the GIC, if implemented, is architecturally specified.
= Version difference summary =
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