Importance

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Abstract

An enhanced translation lookaside buffer (TLB), which translates a virtual address into a physical address, permits sharing of data or programs among a subset of all tasks through the use of a group membership field. Each entry in the TLB includes a global bit indicating that all tasks should have access to the translation, an address space identifier identifying an individual task that should have access to the translation and a group membership field identifying a group of tasks that have access to the entry, wherein the group of tasks is a subset of all tasks. The virtual address also has a group membership field that is compared with a group membership field in the TLB entry. If the two group membership fields match, the current task is permitted to use the translation. Thus, a given translation within the TLB may be valid for all tasks, only an individual task, or a group of tasks.

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First Claim