This section defines the architecturally defined data structures and the ways this data flows through the system over time. In addition to the definition and lifecycle for important pieces of data.
ACPI tables in this stage are located using AcpiSdtProtocol supplied by MdeModulePkg. These tables are updated with the help existing HOBs, policies for different silicon components. APIs to update these tables are located in the AcpiPlatfrom DXE driver.