The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 14, 1989
Filed:
Mar. 07, 1986
Hitachi, Ltd., Tokyo, JP;
Abstract
At an occurrence of an interrupt, each entry of the vector table of the vitrual machine monitor to be referenced by the hardware of the bare machine is loaded with an address of an interrupt processing program of the running virtual machine for an interrupt number associated with the entry. When the interrupt is allowed to be directly processed by the virtual machine, the virtual machine monitor is not activated, that is, the interrupt processing program of the vitual machine can immediately execute the necessary processing, which eliminates the overhead associated with the intervention of the virtual machine monitor. Moreover, the content of the system stack pointer is set to point to the stack of the running virtual machine. Consequently, the content of the registers to be saved for an interrupt processing are directly stored in the stack of the running virtual machine, and therefore the overhead caused because the stack of the virtual machine monitor is used is removed.