The cartridge entry installation exit (CBRUXENT) is passed by way of register 1, the pointer to a parameter list mapped by CBRUXEPL. Here is the format of CBRUXEPL.
UXEPL DSECT , CARTRIDGE ENTRY INSTALLATION EXIT
* PARAMETER LIST
*********************************************************************
*
* CARTRIDGE ENTRY INSTALLATION EXIT PARAMETERS
*
*********************************************************************
UXEPARM DS 0D CBRUXENT PARAMETER SECTION
UXELIB DS CL8 LIBRARY NAME
* (INPUT VARIABLE)
UXELDEV DS CL8 LIBRARY DEVICE TYPE
* (INPUT VARIABLE)
UXELCON DS CL8 LIBRARY CONSOLE NAME
* (INPUT VARIABLE)
UXELTYP DS CL1 LIBRARY LOGICAL TYPE
* 'R' FOR AUTOMATED LIBRARY
* 'M' FOR MANUAL LIBRARY
* (INPUT VARIABLE)
UXESUPPT DS XL1 SUPPORTED FUNCTION
UXELOPM EQU X'80' ON IF OUTBOARD POLICY MANAGEMENT
* SUPPORTED IN LIBRARY
* (INPUT VARIABLE)
DS CL6 RESERVED
UXELDESC DS CL120 LIBRARY DESCRIPTION
* (INPUT VARIABLE)
DS CL8 RESERVED
UXEVOLSR DS CL6 VOLUME SERIAL NUMBER
* (INPUT VARIABLE)
UXEVATTR DS XL1 VOLUME ATTRIBUTE
* 0 PHYSICAL NON-VTS VOLUME
* 1 LOGICAL VTS VOLUME
* 2 IMPORTED VTS LOGICAL VOLUME
* (INPUT VARIABLE)
UXEVINFO DS XL1 ADDITIONAL VOLUME INFORMATION
* (INPUT VARIABLE)
UXEVOPM EQU X'80' ON IF NON-DEFAULT POLICY NAMES
* EXIST AT THE LIBRARY
UXEVSGSP EQU X'40' ON IF STORAGE GROUP NAME
* SPECIFIED THROUGH IMPORT LIST
UXEVMCSP EQU X'20' ON IF MANAGEMENT CLASS NAME
* SPECIFIED THROUGH IMPORT LIST
UXEVSCSP EQU X'10' ON IF STORAGE CLASS NAME
* SPECIFIED THROUGH IMPORT LIST
UXEVDCSP EQU X'08' ON IF DATA CLASS NAME
* SPECIFIED THROUGH IMPORT LIST
UXEUSEA DS CL1 VOLUME USE ATTRIBUTE
* 'P' FOR PRIVATE
* 'S' FOR SCRATCH
* (INPUT/OUTPUT VARIABLE)
UXEWPROT DS CL1 WRITE PROTECTION STATUS
* 'Y' FOR WRITE-PROTECTED
* 'N' FOR NOT WRITE-PROTECTED
* (INPUT/OUTPUT VARIABLE)
UXECHKPT DS CL1 CHECKPOINT VOLUME INDICATOR
* 'Y' FOR CHECKPOINT VOLUME
* 'N' FOR NOT CHECKPOINT VOLUME
* (INPUT/OUTPUT VARIABLE)
UXELOC DS CL1 VOLUME LOCATION CODE
* 'L' FOR LIBRARY-RESIDENT
* 'S' FOR SHELF-RESIDENT
* (INPUT VARIABLE)
UXETDSI DS 0F TAPE DEVICE SELECTION INFORMATION
UXEREC DS XL1 TAPE RECORDING TECHNOLOGY
* (INPUT/OUTPUT VARIABLE)
UXEMEDIA DS XL1 MEDIA TYPE
* (INPUT/OUTPUT VARIABLE FOR MTL)
* (INPUT VARIABLE FOR ATLDS)
UXECOMP DS XL1 COMPACTION
* (INPUT/OUTPUT VARIABLE)
UXESPEC DS XL1 SPECIAL ATTRIBUTE
* (INPUT/OUTPUT VARIABLE)
UXEGROUP DS CL8 STORAGE GROUP NAME
* (INPUT/OUTPUT VARIABLE)
UXESHLOC DS CL32 SHELF LOCATION
* (INPUT/OUTPUT VARIABLE)
UXEOWNER DS CL64 VOLUME OWNER INFORMATION
* (INPUT/OUTPUT VARIABLE)
DS CL8 RESERVED
UXECREAT DS CL10 VOLUME RECORD CREATION DATE
* (INPUT VARIABLE)
UXEENTEJ DS CL10 LAST ENTRY OR EJECTION DATE
* (INPUT VARIABLE)
UXEMOUNT DS CL10 LAST MOUNTED DATE
* (INPUT/OUTPUT VARIABLE)
UXEWRITE DS CL10 LAST WRITTEN DATE
* (INPUT/OUTPUT VARIABLE)
UXEEXPIR DS CL10 VOLUME EXPIRATION DATE
* (INPUT/OUTPUT VARIABLE)
DS CL10 RESERVED
DS CL4 RESERVED
UXEEXITI DS CL16 INSTALLATION EXIT INFORMATION
* (INPUT VARIABLE)
UXELMOPM DS 0CL32 OUTBOARD POLICY MANAGEMENT
UXELMSG DS CL8 LIBRARY MANAGER STORAGE GROUP
* TO CHANGE VALUE, USE UXEGROUP
* (INPUT ONLY)
UXELMSC DS CL8 LIBRARY MANAGER STORAGE CLASS
* (INPUT/OUTPUT VARIABLE)
UXELMMC DS CL8 LIBRARY MANAGER MANAGEMENT CLASS
* (INPUT/OUTPUT VARIABLE)
UXELMDC DS CL8 LIBRARY MANAGER DATA CLASS
* (INPUT/OUTPUT VARIABLE)
DS 0D END OF UXEPL
UXEPLLEN EQU *-UXEPL
SPACE 1
*********************************************************************
*
* RETURN CODES
*
*********************************************************************
UXENOCHG EQU 0 PERFORM ENTER AS REQUESTED
* USING PARAMETER VALUES PASSED
* IN ON INPUT
UXECHG EQU 4 PERFORM ENTER REQUEST BUT NOTE
* THAT PARAMETER VALUES HAVE
* CHANGED ON EXIT
UXEFAIL EQU 8 DENY ENTER REQUEST (FOR AN ATLDS, THE
* VOLUME IS EJECTED FROM THE LIBRARY)
UXEIGNOR EQU 12 IGNORE ENTER REQUEST (FOR AN ATLDS
* THE VOLUME REMAINS IN THE LIBRARY
* IN THE INSERT CATEGORY)
UXEDONT EQU 16 DO NOT CALL THE CARTRIDGE ENTRY
* INSTALLATION EXIT AGAIN AND
* PERFORM CARTRIDGE ENTRY AS
* REQUESTED USING THE PARAMETER
* VALUES PASSED IN ON INPUT
SPACE 1
*********************************************************************
*
* LIBRARY LOGICAL TYPE CONSTANTS
*
*********************************************************************
UXEAUTO EQU C'R' AUTOMATED/REAL LIBRARY
UXEMAN EQU C'M' MANUAL LIBRARY
SPACE 1
*********************************************************************
*
* VOLUME ATTRIBUTE CONSTANTS
*
*********************************************************************
UXEPHYCL EQU 0 PHYSICAL NON-VTS VOLUME
UXELOGCL EQU 1 LOGICAL VTS VOLUME
UXEIMPRT EQU 2 IMPORTED VTS LOGICAL VOLUME
SPACE 1
*********************************************************************
*
* USE ATTRIBUTE CONSTANTS
*
*********************************************************************
UXEPRIV EQU C'P' PRIVATE USE ATTRIBUTE
UXESCRT EQU C'S' SCRATCH USE ATTRIBUTE
SPACE 1
*********************************************************************
*
* TAPE DEVICE SELECTION INFORMATION (TDSI) CONSTANTS
*
*********************************************************************
UXENOCAR EQU 0 ZERO IS AN ACCEPTABLE VALUE FOR TDSI
*********************************************************************
* CONSTANTS TO DEFINE TAPE RECORDING TECHNOLOGY
*********************************************************************
UXENOREC EQU 0 RECORDING TECHNOLOGY UNKNOWN OR
* UNSPECIFIED
UXE18TRK EQU 1 READ/WRITE ON 18 TRACK DEVICE
UXE36TRK EQU 2 READ/WRITE ON 36 TRACK DEVICE
UXE128TRK EQU 3 READ/WRITE ON 128 TRACK DEVICE
UXE256TRK EQU 4 READ/WRITE ON 256 TRACK DEVICE
UXE384TRK EQU 5 READ/WRITE ON 384 TRACK DEVICE
UXEEFMT1 EQU 6 READ/WRITE ON ENTERPRISE FORMAT 1
* (EFMT1) DEVICE
UXEEFMT2 EQU 7 READ/WRITE ON ENTERPRISE FORMAT 2
* (EFMT2) DEVICE
UXEEEFMT2 EQU 8 READ/WRITE ON ENTERPRISE ENCRYPTED FORMAT 2
* (EEFMT2) DEVICE
UXEEFMT3 EQU 9 READ/WRITE ON ENTERPRISE
* FORMAT 3 (EFMT3) DEVICE
UXEEEFMT3 EQU 10 READ/WRITE ON ENTERPRISE
* ENCRYPTED FORMAT 3 (EEFMT3) DEVICE
UXEEFMT4 EQU 11 READ/WRITE ON ENTERPRISE FORMAT 4
* (EFMT4) DEVICE
UXEEEFMT4 EQU 12 READ/WRITE ON ENTERPRISE ENCRYPTED
* FORMAT 4 (EEFMT4) DEVICE
*********************************************************************
* CONSTANTS TO DEFINE MEDIA TYPE
*********************************************************************
UXENOMED EQU 0 MEDIA TYPE UNKNOWN OR UNSPECIFIED
UXEMED1 EQU 1 MEDIA1 - CARTRIDGE SYSTEM TAPE
UXEMED2 EQU 2 MEDIA2 - ENHANCED CAPACITY CARTRIDGE
* SYSTEM TAPE
UXEMED3 EQU 3 MEDIA3 - HIGH PERFORMANCE CARTRIDGE
* TAPE
UXEMED4 EQU 4 MEDIA4 - EXTENDED HIGH PERFORMANCE
* CARTRIDGE TAPE
UXEMED5 EQU 5 MEDIA5 - ENTERPRISE TAPE CARTRIDGE
UXEMED6 EQU 6 MEDIA6 - ENTERPRISE WORM TAPE CARTRIDGE
UXEMED7 EQU 7 MEDIA7 - ENTERPRISE ECONOMY TAPE CARTRIDGE
UXEMED8 EQU 8 MEDIA8 - ENTERPRISE ECONOMY WORM TAPE
* CARTRIDGE
UXEMED9 EQU 9 MEDIA9 - ENTERPRISE EXTENDED TAPE
* CARTRIDGE
UXEMED10 EQU 10 MEDIA10 - ENTERPRISE EXTENDED WORM TAPE
* CARTRIDGE
UXEMED11 EQU 11 MEDIA11 ENTERPRISE ADVANCED
* TAPE CARTRIDGE
UXEMED12 EQU 12 MEDIA12 ENTERPRISE ADVANCED
* WORM TAPE CARTRIDGE
UXEMED13 EQU 13 MEDIA13 ENTERPRISE ADVANCED
* ECONOMY TAPE CARTRIDGE
*********************************************************************
* CONSTANTS TO DEFINE COMPACTION
* (THE MEANING OF THE COMPACTION FIELD HAS CHANGED FROM TYPE OF
* COMPACTION TO COMPACTION YES/NO - UXEIDRC AND UXECOMPT CAN BE
* USED INTERCHANGEABLY)
*********************************************************************
UXECMPNS EQU 0 COMPACTION UNKNOWN OR NOT SET
UXENOCMP EQU 1 NO COMPACTION
UXEIDRC EQU 2 COMPACTION
UXECOMPT EQU 2 COMPACTION
*********************************************************************
* CONSTANTS TO DEFINE SPECIAL ATTRIBUTE
*********************************************************************
UXENOSPC EQU 0 VOLUME HAS NO SPECIAL ATTRIBUTE
UXERDCOM EQU 1 VOLUME WILL BE MOUNTED FOR READ ONLY -
* ALL READ-COMPATIBLE DEVICES MAY BE
* SELECTED
SPACE 1
*********************************************************************
*
* MISCELLANEOUS CONSTANTS
*
*********************************************************************
UXEPLSP EQU 0 UXEPL SUBPOOL NUMBER
UXEYES EQU C'Y' YES
UXENO EQU C'N' NO
UXEBLANK EQU C' ' BLANKOAM obtains storage below the line, from subpool 0, key 5, or subpool 0, user key, for the installation exit parameter list.