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Fast Path Virtual Equal Real Addressing

IP.com Disclosure Number: IPCOM000062610D
Original Publication Date: 1986-Dec-01
Included in the Prior Art Database: 2005-Mar-09

Publishing Venue

IBM

Related People

Authors:
Greenberg, MS Hester, PD [+details]

Abstract

A method is described which enables software in a virtual memory system to bypass the normal address translation process and access real memory directly with a virtual address equal to the desired real address. This technique eliminates the overhead normally associated with a context switch from virtual to real addressing mode. Virtual memory systems generally have two modes of storage addressing. In one mode, all effective addresses are virtual addresses, and are translated to the corresponding real address by the address translation logic in the memory management unit. A second mode is also supported, in which all effective addresses are real, and bypass the address translation logic and are used to directly access memory.