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Windows ARM64 Internals: Pardon The Interruption! Interrupts on Windows for ARM

ID: 7766a6ee-a5ec-5282-9a2f-5a4c8f4c1d0e

STIX ID: report--7766a6ee-a5ec-5282-9a2f-5a4c8f4c1d0e

Feed Name: Connor McGarr’s Blog

Date Published: 2026-01-02

Date Updated: 2026-07-19

Author: Connor McGarr

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## Executive Summary: This blog post provides a detailed technical walkthrough of Windows on ARM interrupt architecture, covering GIC components (distributor, redistributor, CPU interface, ITS), HAL discovery and initialization (nt!HalpGic3Discover and related routines), interrupt delivery/dispatch on ARM64, virtualization and virtual/synthetic interrupts under Hyper-V, and Secure Kernel secure-interrupt handling; it is focused on internals and implementation differences rather than any security incident.

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