How to do SELECT TOP @Param in a Stored Procedure?

 How to do SELECT TOP @Param in a Stored Procedure? 

Here I have created an integer param which is used later in the SELECT statement.

CREATE PROCEDURE [dbo].[SP_get]

@my_param int   

AS

BEGIN

      SET NOCOUNT ON;

SELECT TOP (@top_param) col1, col2, col3

      FROM TableName