Detailed Description

Root System Description Pointer (RSDP)

The first step to using ACPI is finding the RSDP that is used to find the RSDT / XSDT, which themselves contain pointers to even more tables.

On UEFI systems, the RSDP can be found in the EFI_SYSTEM_TABLE; for non-UEFI systems we have to search for the signature 'RSD PTR ' in the EBDA (Extended Bios Data Area) or in the memory area up to FFFFFh.

See also: ACPI-Specification 5.2.5.3; Root System Description Pointer (RSDP) Structure

The documentation for this struct was generated from the following file:

machine/acpi.h