from arc.h:139
struct arc_reg_data_type
{
struct list_head list;
struct reg_data_type data_type;
struct reg_data_type_flags data_type_flags;
struct reg_data_type_struct data_type_struct;
char data_type_id[REG_TYPE_MAX_NAME_LENGTH];
struct arc_reg_bitfield *bitfields;
union {
struct reg_data_type_struct_field *reg_type_struct_field;
struct reg_data_type_flags_field *reg_type_flags_field;
};
};