[eluser]WanWizard[/eluser]
What exactly do you want to achieve?
Datamapper is an ORM, which uses models to provide an object representation of records in a table. It's not made to run arbitrary queries.
If your stored procedure returns full records of a table, so it's result can be mapped to a model, you could add a method to the model that calls the stored procedure using standard DB calls. You can then call _process_query(), passing the CI_DB_Result object from your custom query, to convert the result into Datamapper objects.
Note that the resultset MUST include the 'id' column.