From the wikipedia: "ACPI defines a large number of tables that provide the interface between an ACPI-compliant operating system, and system firmware. For example:[11]
DSDT – Differentiated System Description Table
SSDT – Secondary System Description Table
SRAT – System Resource Affinity Table
The tables allow description of system hardware in a platform-independent manner, and are presented as either fixed-formatted data structures or in AML. The main AML table is the DSDT (differentiated system description table)."
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Neil