Abstract: An efficient PEIM-to-PEIM interface (“PPI”) database for storing data identifying one or more PPIs. The PPI database includes a linked list having one or more linked arrays of elements. The elements in each array store data identifying a PPI. Each array in the linked list of arrays may also include an element reserved for storing data identifying the last element in the array. Each array in the linked list of arrays may also include an element reserved for storing a pointer to a next array in the linked list of arrays. When the last array in the linked list of arrays becomes full, a new array is created, and a pointer to the new array is stored in the last array.

Abstract: A method and system for determining currency of data in a data processing system. The processing steps along a dependency chain used to populate a data reporting program are back tracked recursively through each processing step until a first originating set of processing steps are reached. The currency of each data source for the programs is identified and it is determined whether the program has run since that time. If any one of the sources for the program of the processing step is more recent than a last run time of the program associated with the processing step, the program is re-run and outputs updated. The same process is executed moving forward along the dependency chain, to each other processing step.