Environment

The caller (issuer of the IEFSSREQ macro) must include the following mapping macros:

Data areas commonly referenced are mapped by the following mapping macros. IBM® recommends you include them in your program:

The caller must meet the following requirements:

Caller variable	Caller value
Minimum Authorization	Supervisor state
Dispatchable unit mode	Task
AMODE	24-bit or 31-bit
Cross memory mode	PASN=HASN=SASN
ASC mode	Primary
Interrupt status	Enabled for I/O and external interrupts
Locks	No locks held
Control Parameters	The SSOB, SSIB, and SSRR control blocks can reside in storage above 16 megabytes.
Recovery	The caller should provide an ESTAE-type recovery environment. See z/OS MVS Programming: Authorized Assembler Services Guide for more information on an ESTAE-type recovery environment.

Figure 1 shows the environment at the time of the call for SSI function code 21.

Figure 1. Environment at Time of Call for SSI Function Code 21