| 摘要 |
PURPOSE:To save overhead, by providing a plurality of registers storing a mode section additionally and selecting and indicating one of effective registers during run, in a virtual computer system. CONSTITUTION:In an information processing device provided with a register 20 storing a program status word PSW and a status register 8 and running a plurality of operating systems on one computer multiplexedly, at the execution of program status work PSW renewal instruction, a mode section of the real PSW is stored as it is, assigned simulation registers 18 and 19 are renewed, and at the reception of interruption, the mode section of a virtual computer is reflected as the old PSW information. Thus, the old PSW information can be transferred to a virtual computer prefix area. |
