ACPI_TABLE_MPST
UINT32 Offset = sizeof (ACPI_TABLE_MPST);
SubtableCount = (ACPI_CAST_PTR (ACPI_TABLE_MPST, Table))->PowerNodeCount;
#define ACPI_MPST_OFFSET(f) (UINT16) ACPI_OFFSET (ACPI_TABLE_MPST,f)