EFI_ACPI_6_0_FPDT_RECORD_TYPE_S3_PERFORMANCE_TABLE_POINTER

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
extern (C)
enum EFI_ACPI_6_0_FPDT_RECORD_TYPE_S3_PERFORMANCE_TABLE_POINTER = 0x0001;

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