I/O execution method for a virtual machine system and system the

Details I/O execution method for a virtual machine system and system the I/O execution method for a virtual machine system and system the

1992-03-16

1995-02-21

Rudolph, Rebecca L.

Boots, shoes, and leggings

395275, 395700, 364DIG1, G06F 1200

Patent

active

053924096

ABSTRACT:
In a computer system having a central processing unit, a main storage and at least one I/O device, a plurality of operating systems (OS) can simultaneously run under the control of a control program. For executing an I/O instruction using a central processing unit, a plurality of resident areas of said main storage which do not overlap one another are assigned, under the control of the control program, to the plurality of OSs as main memories therefore, respectively. In responding to an I/O instruction issued by a running one of said plural OSs, an address of said main memory assigned to said running OS which participates in an I/Oo operation requested by said I/O instruction is determined without intervention of the control program, and the address is translated into an address of the main storage of the computer system without intervention of said control program. The I/O operation is then executed by using the address resulting from said address translation.

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