Method and means for switching system control of cpus

Details Method and means for switching system control of cpus Method and means for switching system control of cpus

G - Physics

06

F

354/230.82

G06F 9/46 (2006.01) G06F 9/455 (2006.01) G06F 9/48 (2006.01)

Patent

CA 1182575

ABSTRACT OF THE DISCLOSURE The embodiment switches an address in a prefix register in a CPU of a MP or UP data processing system from one PSA (program save area) to another PSA. The prefix address switching changes the control of the CPU from a preferred guest SCP (system control program) to a host SCP. This switching is done by hardware/ microcode means which is not controllable by user instructions executable on the CPU. This manner of CPU control switching obtains for a preferred guest SCP (such as MVS/370) operating in relation to a host SCP (such as VM/370) nearly the efficiency of standalone execution on the CPU by a preferred guest SCP that is the same as a standalone version of the guest SCP.

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