z/OS MVS Programming: Extended Addressability Guide
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Writing an Initialization Routine

z/OS MVS Programming: Extended Addressability Guide
SA23-1394-00

The system program invokes the initialization routine in supervisor state. The routine must reside in the link pack area (PLPA, MLPA, or fixed LPA) or in a library in the LNKLST concatenation.

On entry to the initialization routine:
  • Register 1 contains the address of the parameter list, which contains the following:
    • Address of the newly created address space's ASCB (mapped by IHAASCB)
    • Address of ECBs (mapped by IEZEAECB)
  • Register 13 contains the address of a standard 18-word save area.
  • Register 14 contains the return address.
  • Register 15 contains the address of the initialization routine.
Parent topic: Using the ASCRE macro to create an address space

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