FADT

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FADT (Fixed ACPI Description Table) is a data structure used in the ACPI programming interface. This table contains information about fixed register blocks pertaining to power management.

Finding the FADT

The FADT is pointed to by an entry in the RSDT. The signature is 'FACP'.

Structure

The FADT contains pointers to two additional tables (in addition to a lot of other information):

  • The FACS (Firmware ACPI Control Structure) at offset 36 (4 byte physical address)
  • The DSDT (Differentiated System Description Table) at offset 40 (4 byte physical address)
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