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EP0223551A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Main storage access control system for virtual computing function system

Assignee: Fujitsu Ltd
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Filing: 1986-11-12
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Granted: —
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Expires: 2006-11-12
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Abstract

Abstract A main storage access control system for a virtual computing function system includes an address register (14, 16) for registering memory addresses used for accessing a main storage (4) and being operated under a plurality of address modes having different effective bit lengths concerning the memory addresses, a tag register (30) for registering tag bits for individually designating the address registers, and a selection unit (33) for selecting the designation of address registers designated by the tag bits by means of an operand address of an instruction which is to be executed by the program of the virtual machine monitoring region. The address mode is changed to the address mode used by the virtual computing function system by means of the output signal of the selection means (33). A method concerning the conversion of an access key by the output of a register designation detection unit in a virtual computing function system is also disclosed.

Inventors

  • 👤 Toshio Matsumoto

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-31 22:24
CPC Classifications
G; G06; G06F; G06F12/00; G06F12/02; G06F12/08; G06F12/10; G06F12/0223; G06F12/0292; G06F12/14; G06F12/1458; G06F12/1466; G06F12/1475

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 143 words
A main storage access control system for a virtual computing function system in which programs of virtual machine regions and a virtual machine monitoring region are to be executed, said system comprising: an address register for registering memory addresses used for accessing a main storage, said address register being operable under a plurality of address modes having different effective bit lengths concerning said memory addresses; a tag register for registering tag bits for individually designating said address registers; and selection means for selecting designation of address registers designated by said tag bits by means of an operand address of an instruction which is to be executed by the program of said virtual machine monitoring region; wherein, in use, said address mode is changed to the address mode used by said virtual computing function system by-means of the output signal of said selection means.
Claim 2
Dependent Claim 143 words
A main storage access control system for a virtual computing function system in which programs of virtual machine regions and a virtual machine monitoring region are to be executed, said system comprising: an address register for registering memory addresses used for accessing a main storage, said address register being operable under a plurality of address modes having different effective bit lengths concerning said memory addresses; a tag register for registering tag bits for individually designating said address registers; and selection means for selecting designation of address registers designated by said tag bits by means of an operand address of an instruction which is to be executed by the program of said virtual machine monitoring region; wherein, in use, said address mode is changed to the address mode used by said virtual computing function system by-means of the output signal of said selection means.
Claim 3
Dependent Claim 135 words
A main storage access control system for a virtual computing function system in which programs of virtual machine regions and virtual machine monitoring region are to be executed, said system comprising: a main storage for storing programs and having a data portion and a key portion; an address register for registering memory addresses used for accessing said main storage; key reference means for comparing a memory protection key and an access key and carrying out an access control; a tag register for registering tag bits for individually designating said address register; and register designation detection means for detecting a designation of an address register by said tag bit; wherein, in use, the output of said register designation detection means is used for changing said access key to an access key for the virtual machine function.
Claim 4
Dependent Claim 135 words
A main storage access control system for a virtual computing function system in which programs of virtual machine regions and virtual machine monitoring region are to be executed, said system comprising: a main storage for storing programs and having a data portion and a key portion; an address register for registering memory addresses used for accessing said main storage; key reference means for comparing a memory protection key and an access key and carrying out an access control; a tag register for registering tag bits for individually designating said address register; and register designation detection means for detecting a designation of an address register by said tag bit; wherein, in use, the output of said register designation detection means is used for changing said access key to an access key for the virtual machine function.

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