Documentation for ACPI Component Architecture (ACPICA)

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Documents

The current release of ACPICA is version 20260930

• Introduction to ACPI Architecture

• Basic ACPI Source Language (ASL) Constructs Tutorial

• ACPI Source Language: ASL 2.0 Introduction and Overview

• ACPI Specification Version 6.6 (May 2025)

• All ACPI Specifications

• ACPICA User Guide and Programmer Reference

  • pdf
  • doc

• iASL: ACPI Source Language Optimizing Compiler/Disassembler User Guide

  • pdf
  • doc

• ACPI Specification Version 6.1 (January 2016, 6.2 MB, 1082 Pages)

• Runtime BIOS Fixes for ACPI Tables (July 2013)

  • Describes methods for the BIOS to perform runtime modifications to ACPI tables before handoff to the operating system.

• Intel® Processor Vendor-Specific ACPI: Interface Specification (December 2014)

  • Describes the Intel® processor driver capabilities bit definitions.

• Processor Clocking Control Interface Specification (Version 1.0, February 23, 2009)

  • Technical description of the Processor Clocking Control (PCC) interface.

• BIOS Boot Specification (Version 1.01 January 11, 1996)

  • Technical description of how the BIOS should identify boot devices.

• Multiprocessor Startup for ARM* Platforms (Version 1, September 23, 2014)

  • Protocol for starting multiple ARM* processors.

• Core System Resources Table (CSRT November 14, 2011)

  • Definition of CSRT ACPI table for shared hardware functions.

Release notes

Starting with version 20260930, release notes are published with each GitHub release. The full change history is kept in documents/changelogs.md.

• 2026.09
• 2026.04
• 2025.12
• 2025.08
• 2025.04
• 2024.12
• 2024.09