ACPI_GTDT_TIMER_BLOCK
SubtableLength = sizeof (ACPI_GTDT_TIMER_BLOCK);
GtCount = (ACPI_CAST_PTR (ACPI_GTDT_TIMER_BLOCK,
GtCount = (ACPI_CAST_PTR (ACPI_GTDT_TIMER_BLOCK,
#define ACPI_GTDT0_OFFSET(f) (UINT16) ACPI_OFFSET (ACPI_GTDT_TIMER_BLOCK,f)