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Patent Searching and Data


Title:
VIRTUAL MACHINE SYSTEM
Document Type and Number:
Japanese Patent JPS60225944
Kind Code:
A
Abstract:

PURPOSE: To curtail a simulation overhead of a virtual machine control program VMCP by executing directly a privileged instruction for controlling a control register, and deciding an interruption to the VMCP by a hardware.

CONSTITUTION: When a privileged instruction issued from a virtual machine VM3 and decided to be a direct executing mode by an actual computer 1, occupies a control register of the actual computer 1 by an actual computer use microprogram 12, and in other case, it is processed by a firmware assist VMA microprogram 13. In case it is processed by the actual computer use microprogram 12, whether it is necessary to execute an interruption to a VMCP or not is decided by a decision use hardware 14, but the decision processing as to whether a submask is changed or not, and whether the submask is "1" or not is executed by a hardware at a high speed. In case the condition is formed, the interruption is executed to the VMCP, and if it is not formed, the control is returned to the VM3.


Inventors:
IKEGAYA HIROSHI
UMENO HIDENORI
KUBO TAKASHIGE
Application Number:
JP8175184A
Publication Date:
November 11, 1985
Filing Date:
April 25, 1984
Export Citation:
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Assignee:
HITACHI LTD
International Classes:
G06F9/46; G06F12/08; G06F12/10; G06F15/00; (IPC1-7): G06F9/46; G06F12/08; G06F15/00
Attorney, Agent or Firm:
Akio Takahashi