Preserving cache consistency in a computer system

专利名称：Preserving cache consistency in a computer

system having a plurality of memories withoverlapping address ranges

发明人：Nobuyuki Oba,Ikuo Sho,Takeo Nakada申请号：US08/529298申请日：19950915公开号：US06049852A公开日：20000411

摘要：A means for preserve cache consistency is provided for a system comprising acentral processing unit, a first physical memory, a second physical memory for which theaddress is common to the first physical memory in at least some duplicated addressrange of the entire physical address, a cache memory, and a memory controller, whereinthe first or second physical memory is selected depending on the operation mode. Flagbits are provided in a tag memory of the cache for information identifying the datasource. The cache then does not determine a cache hit/miss only based on whether datarelated to a CPU requested address exists in the cache, but determines whether thesource of data requested by the CPU is consistent with the source of data stored in thecache by taking into account information on the operation mode simultaneously sentfrom the CPU. A cache hit is determined only when such two conditions are met.

申请人：INTERNATIONAL BUSINESS MACHINES CORPORATION

代理人：Martin J. McKinley

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