Multiple address space token designation, protection controls, designation translation and lookaside
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United States of America Patent
Stats
-
Dec 18, 1990
Issued Date -
N/A
app pub date -
Jun 8, 1990
filing date -
Feb 10, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus is provided to translate the contents of access registers into information for use in performing addressing functions for multiple virtual address spaces. The access registers represent the full addressing capability of the system but do not directly contain the addressing information. The system has a plurality of general purpose registers, a plurality of access registers associated with the general registers, an access list having access list entries which is addressed by the contents of the access register, memory storage for holding address space number second table entries (ASTE), where the contents of the access list entry locate the ASTE and where the ASTE contains the addressing information needed to translate a virtual address when combined with the contents of a general purpose register. Access register translation (ART) consists of the process of determining addressing information by using the access list entry and the ASTE. The results of the ART process are stored in an ART lookaside buffer (ALB) which stores the results of ART while valid for later use.
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