Call existing stored procedure from Entity Framework Core

I'm using the latest EF Core 1.1.1 with .NET Core. Now I want to implement some generic code inside OnModelCreating method in my ApplicationDbContext class to call any existing SP from db. Please note, I have both my model classes as well as database tables. So neither do I want any migration nor want to specify SP params for a particular SP inside OnModelCreating. It should be a generic implementation that can be used for any SP. My sole purpose is to call any existing SP from databse.

Entity:

public class Product
{
 public int Id { get; set; }
 public string Name { get; set; }
 public decimal Price { get; set; }

}

ApplicationDbContext Class:

public class ApplicationDbContext : DbContext
{
  public ApplicationDbContext ()
  {
   Database.Connection.ConnectionString = "Data Source=.\\SQLExpress;Initial 
   Catalog=CallingExistingSPFromEFCore;Integrated Security=True";
  }

  public DbSet<Product> Products { get; set; }

  protected override void OnModelCreating(DbModelBuilder modelBuilder)
  {
   modelBuilder.Entity<Product>().MapToStoredProcedures
  (
       //What should be the implementation here ?
  )

      base.OnModelCreating(modelBuilder);
  }
}