acpi_descriptor
#define ACPI_GET_DESCRIPTOR_PTR(d) (((union acpi_descriptor *)(void *)(d))->common.common_pointer)
#define ACPI_SET_DESCRIPTOR_PTR(d, p) (((union acpi_descriptor *)(void *)(d))->common.common_pointer = (p))
#define ACPI_GET_DESCRIPTOR_TYPE(d) (((union acpi_descriptor *)(void *)(d))->common.descriptor_type)
#define ACPI_SET_DESCRIPTOR_TYPE(d, t) (((union acpi_descriptor *)(void *)(d))->common.descriptor_type = (t))
union acpi_descriptor *descriptor;
ACPI_CAST_PTR(union acpi_descriptor,