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ACPI

This document describes the ACPI implementation in the Kyronix kernel. It is the child of Drivers.

Source

kernel/drivers/acpi.c

Overview

ACPI (Advanced Configuration and Power Interface) provides hardware configuration information. The kernel parses the RSDP (Root System Description Pointer) to locate the ACPI tables.

Initialization

acpi_init(rsdp_address);
  1. Read RSDP from the address provided by Limine
  2. Validate RSDP signature (“RSD PTR “)
  3. Locate RSDT/XSDT (Root/Extended System Description Table)
  4. Parse SDT entries for MADT (APIC), FADT (Fixed ACPI), and others

Key Tables

TablePurpose
RSDPRoot pointer to all ACPI tables
RSDT/XSDTRoot/Extended System Description Table
MADTMultiple APIC Description Table (CPU topology)
FADTFixed ACPI Description Table (PM timer, reset port)

Functions

FunctionDescription
acpi_init(addr)Parse ACPI tables from RSDP address
acpi_available()Check if ACPI was successfully initialized

Last reviewed: 2026-07-22