Storage Map Service

The storage map service allows exit routines to process storage map entries and to obtain data represented by the storage map entries.

The functions provided by the storage map service are:

Storage Access (SA): The storage map service accesses the storage requested in the storage map record that is passed as input. Because storage map records are being changed to describe data space storage, this function can be used to obtain data space storage from the dump. There are several ways to request the dump access by setting the function code flags.
The storage map service can retrieve literal values. The service can retrieve the entire literal value or an arbitrary, contiguous portion of it. The service does not add storage map entries to the storage map for symbolic literals; scan processing results are returned only to the caller.
Validity check: The storage map service allows the user to request that a control block be validity checked and an SA record (BLSRSASY macro) be created.
Describe block being scanned: The storage map service allows a user-supplied scan routine to introduce a control block in error, prior to describing the particular errors detected.

Note that in OS/390® Release 10 and higher, the storage map service supports 64-bit addresses and lengths.