mlx_inw
*status = mlx_inw(mlx, MLX_V1REG_MAILBOX + 0x0e);
static __inline u_int16_t mlx_inw(struct mlx_softc *, int);
*status = mlx_inw(mlx, MLX_V3REG_STATUS);
*status = mlx_inw(mlx, MLX_V4REG_STATUS);
*status = mlx_inw(mlx, MLX_V5REG_STATUS);