ACPICA is the cross-platform reference implementation of the ACPI specification, providing the AML bytecode interpreter, namespace manager, and table parser that underpin power management and hardware enumeration on essentially every modern x86, x86-64, and ARM64 PC and server. It is shared upstream code synchronized with Intel's ACPICA project, not a driver for any particular device.
This is not actually a driver directory; it is the in-kernel copy of ACPICA, the reference ACPI Component Architecture code maintained jointly with Intel that every ACPI-capable system relies on to parse firmware tables and run AML bytecode. It is foundational infrastructure for the wider ACPI subsystem rather than something that binds to a specific piece of hardware.
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monthly commits · 2021-04-21 → 2026-04-21 · 137 total · active in 39/61 months
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codex reasoning notes (technical)
Not a driver directory: contains the ACPICA ACPI interpreter/core implementation used by the ACPI subsystem, not a kernel-bound hardware device driver.