EFI_ACPI_5_0_MPST_MEMORY_POWER_COMMAND_GET_AVERAGE_POWER_CONSUMED

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_5_0_MPST_MEMORY_POWER_COMMAND_GET_AVERAGE_POWER_CONSUMED = 0x03;

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