US Patent 11803486 Write merging on stores with different privilege levels

A caching system including a first sub-cache, a second sub-cache, coupled in parallel with the first sub-cache, for storing write-memory commands that are not cached in the first sub-cache, the second sub-cache including privilege bits configured to store an indication that a corresponding cache line of the second sub-cache is associated with a level of privilege, and wherein the second sub-cache is further configured to receive a first write memory command for a memory address associated with a first level of privilege, store, in the second sub-cache, first data associated with the first write memory command and the level of privilege associated with the cache line, receive a second write memory command for the cache line, the second write memory command associated with a second level of privilege, merge the first level of privilege with the second level of privilege, and output the merged privilege level with the cache line.