z/VM: CP Commands and Utilities Reference - z/VM - IBM

SYSTEM
SYSTEM
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SYStem
Authorization
Purpose
Operands
Usage Notes
CLEAR
RESET
RESTART
STORE STATUS
Privilege Class: G
1566 z/VM: CP Commands and Utilities Reference
Use SYSTEM to clear storage and to simulate the actions of RESET, RESTART,
and STORE STATUS functions from a real console, as specified in z/Architecture
Principles of Operation.
CLEAR
performs a system-reset-clear function on your virtual machine and places all
processors in your configuration in a hard stop.
RESET
performs a system-reset-normal function on your virtual machine and places all
processors in your virtual machine’s configuration in a hard stop.
RESTART
simulates the hardware system RESTART function by storing the current PSW
at second-level location 8 and loading, as the new PSW, the doubleword from
virtual location 0. Interrupt conditions and storage remain unaffected.
STORE STATUS
stores selected virtual machine data in certain low storage locations of the
virtual machine, simulating the hardware store status facility. These locations
are permanently assigned locations in guest absolute storage.
1. When the SYSTEM CLEAR command or the SYSTEM RESET command is
entered from the virtual machine console as the first or only command on a CP
command line (that is, while the terminal mode is CP, or CP READ is displayed
or the command line begins with #CP), VM attempts to break out of certain wait
conditions that might exist. Thus the SYSTEM CLEAR command or the
SYSTEM RESET command may be entered to cause breakout of certain virtual
machine wait conditions.
The breakout attempt occurs when the SYSTEM CLEAR command or the
SYSTEM RESET command is entered, not when the command is processed.
Command errors do not prevent the breakout attempt. In some cases, a
breakout resets the virtual machine.
2. The RESET function and the CLEAR operands leave the virtual machine in a
stopped state.
3. To resume operation after issuing the SYSTEM command with RESET
specified, either store a PSW and enter BEGIN or enter BEGIN with a
hexadecimal storage location specified. When doing either of these, be sure the
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