ASYNC_SPD_VHI      64 include/uapi/linux/tty_flags.h #define ASYNC_SPD_CUST		(ASYNC_SPD_HI|ASYNC_SPD_VHI)
ASYNC_SPD_VHI      66 include/uapi/linux/tty_flags.h #define ASYNC_SPD_MASK		(ASYNC_SPD_HI|ASYNC_SPD_VHI|ASYNC_SPD_SHI)