Controller for two timers of a virtual machine system, one updat

Details Controller for two timers of a virtual machine system, one updat Controller for two timers of a virtual machine system, one updat

1990-09-07

1991-06-11

Fleming, Michael R.

Boots, shoes, and leggings

364200, 364900, G06F 900, G06F 946

Patent

active

050237713

ABSTRACT:
For use in a virtual machine system including a mode register indicative of one of NVM, VMM, and VMOS modes in which the virtual machine system is operating, a timer controller comprises a first timer and updated when the mode register indicates whichever of the NVM, VMM, and VMOS modes, a second timer coupled to the mode register and updated only when the mode register indicates the VMOS mode, and interruption receiving circuit for receiving a first interruption as a first received interruption and a second interruption as a second received interruption when the first and the second timers are updated to a predetermined value, respectively, and an arrangement for informing a host operating system of the first received interruption and guest operating systems of the second received interruption. Preferably, the arrangement is coupled to the mode register to inform the host operating system of the first received interruption when the mode register indicates either the NVM or VMM mode. When the mode register indicates the VMOS mode, the arrangement reports the first received interruption to a virtual machine control program of the host operating system.

REFERENCES:
patent: 4161787 (1979-07-01), Groves et al.
patent: 4400769 (1983-08-01), Kaneda et al.
patent: 4812967 (1989-03-01), Hirosawa et al.
patent: 4814975 (1989-03-01), Horosawa et al.
patent: 4816992 (1989-03-01), Matsumoto
patent: 4860190 (1989-08-01), Kaneda et al.
patent: 4885681 (1989-12-01), Umeno et al.

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