ACPI_GTDT_HEADER
ACPI_GTDT_HEADER *Subtable;
Subtable = ACPI_ADD_PTR (ACPI_GTDT_HEADER, Table, Offset);
Subtable = ACPI_ADD_PTR (ACPI_GTDT_HEADER, Subtable, SubtableLength);
Subtable->Buffer - sizeof(ACPI_GTDT_HEADER)))->TimerCount;
#define ACPI_GTDTH_OFFSET(f) (UINT16) ACPI_OFFSET (ACPI_GTDT_HEADER,f)
ACPI_GTDT_HEADER Header;
ACPI_GTDT_HEADER Header;