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Conditional Instruction Buffer Purge on SPKA

IP.com Disclosure Number: IPCOM000069380D
Original Publication Date: 1978-Apr-01
Included in the Prior Art Database: 2005-Feb-20

Publishing Venue

IBM

Related People

Authors:
Richardson, EL Smith, RM [+details]

Abstract

On most System/370 processors the storage key checking is performed as instructions are prefetched into the instruction (I) buffer. No storage key checking is performed as the instructions are executed from the I buffer. This eliminates the hardware cost of maintaining a copy of the storage key with each instruction in the buffer.