Steps to manage subspaces

The steps to create, branch to, and delete subspaces, and the macros and instructions associated with each step, are outlined in Table 1. The table also includes the program authorization requirements. Each step is explained in detail on the topic indicated.

Table 1. Steps for creating, using, and deleting subspaces
Step	Minimum Authorization	Performed by:	See
Determine if the subspace is available on your system	Problem state and any PSW key	Testing a bit in the CVT	Determining whether subspaces are available on your system
Obtain storage for subspaces	Problem state and any PSW key	Using the GETMAIN or STORAGE macro	Obtaining storage for subspaces
Make the storage eligible to be assigned to subspaces	Supervisor state or PSW key 0 - 7	Using the IARSUBSP macro with IDENTIFY	Making a range of storage eligible to be assigned to a subspace
Create the subspaces	Supervisor state or PSW key 0 - 7	Using the IARSUBSP macro with CREATE	Creating the subspaces
Add the subspace entries to the DU-AL	Problem state and any PSW key	Using the ALESERV macro with ADD	Establishing addressability to a subspace
Assign the identified storage to the subspace		Using the IARSUBSP macro with ASSIGN	Assigning storage to the subspaces
Branch and run an application program in a subspace		Using the BSG instruction	Branching to a subspace
Disassociate the storage from the subspace		Using the IARSUBSP macro with UNASSIGN	Disassociating storage from the subspaces
Remove the entry from the DU-AL		Using the ALESERV macro with DELETE	Removing the subspace entry from the DU-AL
Delete the subspace	Supervisor state or PSW key 0 - 7	Using the IARSUBSP macro with DELETE	Deleting the subspace
Make the storage ineligible to be assigned to a subspace.	Supervisor state or PSW key 0 - 7	Using the IARSUBSP macro with UNIDENTIFY	Making storage ineligible to be assigned to a subspace
Release the storage	Problem state and any PSW key	Using the FREEMAIN or STORAGE macros	Releasing storage