Programming Interface Information: This information is NOT intended to be used as Programming Interfaces of z/VM.

#### FRWRK

Prolog

Control Block Contents
FRWRK DSECT

Storage Layout

Cross Reference (Contains links to field and bit definitions)

#### FRWRK Prolog

     Name       : DMSFRWRK
     Description: Master control block for storage management
     DSECT      : FRWRK
     Function   : Mapping macro used by storage
                  management. It is anchored at NUCFRWRK in
                  NUCON. It contains: o Anchors to other storage
                  management control blocks o Flags o Parameter
                  list work areas o Trace facility information o
                  Addresses of entry points o Save areas o First
                  part of SUBBK free list o End of the Page
                  Allocation Table

#### FRWRK Control Block Content

#### FRWRK DSECT

    Hex   Dec Type/Val   Lng Label (dup)    Comments
    ---- ---- --------- ---- -------------- --------
    0000    0 Structure      FRWRK          Master control block for storage
                                            management
          Common Storage Management Equates
              00001000       FRWBIP         4096 Number of bytes in a page of
                                            storage
              0000000C       FRWBIPSH       12 Equate for shift mult/divide
                                            by 4096
              00000100       FRWPGMEG       256 Number of 4K pages in a
                                            megabyte
              00100000       FRWBYMEG       FRWBIP*FRWPGMEG Number of bytes
                                            in a Megabyte
              00000055       FRWSUBPG       FRWBIP/SUBSIZEB Number of SUBBKs
                                            in one page
              .... ....      FRWMEG16       X'01000000' (2**24)
              00F00000       FRWMEGAL       X'FFF00000' For Meg alignment
                                            computes
              00FFF000       FRWPAGAL       X'FFFFF000' For Page alignment
                                            computes
              00000FFF       FRWPNOAL       X'00000FFF' For non-page align
                                            computes
              1111 ....      FRWNUCKY       X'F0' Equate for NUCLEUS Key
                                            Storage
              111. ....      FRWUSRKY       X'E0' Equate for USER Key Storage
          The following equates are used to determine how many
          STOBK's should reside in DMSFRWRK. The STOBK's for the
          high end of the virtual machine are "overlapped" into
          FRWRK to reduce page references. Changing FRWSTONM will
          control the number of STOBK's in FRWRK. Reducing this
          equate will reduce the number of STOBK's and increase the
          number of SUBBK's in the free list at the high end of this
          page. Increasing this equate will increase the number of
          STOBK's and reduce the number of SUBBK's.
              0000004D       FRWSTONM       77 Number of STOBK's in FRWRK
              00000738       FRWSTOSP       FRWSTONM*STOSIZEB Space in FRWRK
                                            for STOBK's
          DMSFRUMX Service Request Codes
              00000000       FRWMXTLT       0 Return Total on unalloc queue
                                            < 16Mb
              00000001       FRWMXLLT       1 Return Largest on unalloc queue
                                            < 16Mb
              00000002       FRWMXTGT       2 Return Total on unalloc queue
                                            > 16Mb
              00000003       FRWMXLGT       3 Return Largest on unalloc queue
                                            > 16Mb
              00000004       FRWMXPLT       4 Return Total partial F.S. on a
                                            SUBBK < 16Mb
              00000005       FRWMXPGT       5 Return Total partial F.S. on a
                                            SUBBK > 16Mb
              00000006       FRWMXFLT       6 Return Num of full pages on a
                                            SUBBK < 16Mb
              00000007       FRWMXFGT       7 Return Num of full pages on a
                                            SUBBK > 16Mb
              00000007       FRWMXCOD       7 Equal to the last vaild code
                                            above.
          Storage Management message numbers and codes
              0000009F       FRWMS159       159 Message number in repository
              000000A0       FRWMS160       160 Message number in repository
              000000A1       FRWMS161       161 Message number in repository
              000000A2       FRWMS162       162 Message number in repository
              000000A3       FRWMS163       163 Message number in repository
              000000A4       FRWMS164       164 Message number in repository
              000000A5       FRWMS165       165 Message number in repository
              000000A6       FRWMS166       166 Message number in repository
              000000A7       FRWMS167       167 Message number in repository
              00000330       FRWMS816       816 Message number in repository
              00000331       FRWMS817       817 Message number in repository
              00000332       FRWMS818       818 Message number in repository
              00000333       FRWMS819       819 Message number in repository
              00000334       FRWMS820       820 Message number in repository
              00000335       FRWMS821       821 Message number in repository
              00000467       FRWM1127       1127 Message number in repository
              00000001       FRWCOD01       1 Same meaning as functions RC of
                                            1
              00000002       FRWCOD02       2 Same meaning as functions RC of
                                            2
              00000003       FRWCOD03       3 Same meaning as functions RC of
                                            3
              00000004       FRWCOD04       4 Same meaning as functions RC of
                                            4
              00000005       FRWCOD05       5 Same meaning as functions RC of
                                            5
              00000006       FRWCOD06       6 Same meaning as functions RC of
                                            6
              00000007       FRWCOD07       7 Same meaning as functions RC of
                                            7
              00000008       FRWCOD08       8 Same meaning as functions RC of
                                            8
              00000009       FRWCOD09       9 Same meaning as functions RC of
                                            9
              0000000A       FRWCOD10       10 Same meaning as functions RC
                                            of 10
              0000000B       FRWCOD11       11 Same meaning as functions RC
                                            of 11
              0000004E       FRWCOD78       78 Reserved for future use
              0000004F       FRWCOD79       79 Reserved for future use
              00000050       FRWCOD80       80 Reserved for future use
              00000051       FRWCOD81       81 DMSFRUAB re-entered during
                                            ABEND
              00000052       FRWCOD82       82 No SSAVE for non-GLOBAL
                                            Subpools
              00000053       FRWCOD83       83 Error on Implicit Subpool
                                            creation
              00000054       FRWCOD84       84 STOLARGE was zero or incorrect
              00000055       FRWCOD85       85 HDRLEN was zero
              00000056       FRWCOD86       86 STOFREEB was zero for partial
                                            page
              00000057       FRWCOD87       87 NUCFRWRK is invalid
              00000058       FRWCOD88       88 FRWPATS or FRWPATE is invalid
              00000059       FRWCOD89       89 Ptr from FRWRK to a SUBBK is
                                            invalid
              0000005A       FRWCOD90       90 NUCLEUS SUBBK is invalid
              0000005B       FRWCOD91       91 INTERNAL SUBBK is invalid
              0000005C       FRWCOD92       92 USER SUBBK is invalid
              0000005D       FRWCOD93       93 Ptr in named SUBBK is invalid
              0000005E       FRWCOD94       94 Ptr in GLOBAL non-system SUBBK
                                            invalid
              0000005F       FRWCOD95       95 Message sub-code of 95
              00000063       FRWCOD99       99 Unexpected error within STMG
          Space reserved for STOBK's
    0000    0 Bitstring    1 FRWSTOAR (1848)
                                            Reserved Bytes for STOBK's
              00000738       FRWPATND       * End of the Page Allocation
                                            Table
          Addresses utilized for location of STMG components
    0738 1848 Address      4 FRWAPATS       Starting Address of the PAT (Low
                                            end)
    073C 1852 Address      4 FRWAPATE       Ending Address of the PAT (High
                                            End)
    0740 1856 Address      4 FRWISPLB       Last block of internal STOBKs
                                            (used by CMS)
          Chains of unallocated STOBKs
    0744 1860 Address      4 FRWHDG16       Head of the Unallocated STOBKs
                                            > 16Mb
    0748 1864 Address      4 FRWTLG16       Tail of the Unallocated STOBKs
                                            > 16Mb
    074C 1868 Address      4 FRWHDL16       Head of the Unallocated STOBKs
                                            <= 16Mb
    0750 1872 Address      4 FRWTLL16       Tail of the Unallocated STOBKs
                                            <= 16Mb
          SUBBK Free List Anchors
    0754 1876 Address      4 FRWSUBHD       Head of the Free (unused) SUBBKs
    0758 1880 Address      4 FRWSUBTL       Tail of the Free (unused) SUBBKs
          Chains of subpools
    075C 1884 Address      4 FRWISPHD       Head of the Internal (CMS
                                            STORAGE) SUBBKs
    0760 1888 Address      4 FRWSHAHD       Head of the SHARED SUBBK SVC
                                            chain thread
          NOTES      : The following subpool anchors are in a specific
                order. They match the order of the SPLSUB array in
                the CMSSTOR macro. Updates to either one of these
                tables must be consistent. Whenever any of these
                subpools are specified on the CMSSTOR macro in the
                string form: SUBPOOL='NUCLEUS' a code byte will be
                generated in the plist that is an offset into this
                table. This will give immediate look-up of the
                SUBBK's for the preferred subpools.
                If a non-string form of the subpool name is given
                or it is not one of these subpools, the code byte
                will be zero - meaning don't use this look-up
                method but the "normal" path instead. The anchor for
                the GLOBAL subbk chain is placed in the zero slot
                of this table to "fill" it without having to waste
                4-bytes of space. The GLOBAL chain will never
                actually be found with this "fast-path" method
    0764 1892 Signed       4 FRWSPLTB (0)   Table of preferred subpools
    0764 1892 Address      4 FRWGLBHD       Head of the GLOBAL SUBBK Chain No
                                            Code
    0768 1896 Address      4 FRWBLNHD       Pointer to the DMSBLOKN SUBBK
                                            Code 1
    076C 1900 Address      4 FRWNUCHD       Pointer to the NUCLEUS SUBBK Code
                                            2
    0770 1904 Address      4 FRWUSRHD       Pointer to the USER SUBBK Code 3
    0774 1908 Address      4 FRWBLUHD       Pointer to the DMSBLOKU SUBBK
                                            Code 4
    0778 1912 Address      4 FRWOSSHD       Pointer to the DMSMVSOS SUBBK
                                            Code 5
    077C 1916 Address      4 FRWDUSHD       Pointer to the DMSUSER SUBBK Code
                                            6
    0780 1920 Address      4 FRWLDTHD       Pointer to the DMSLDSET SUBBK
                                            Code 7
    0784 1924 Address      4 FRWBLSHD       Pointer to the DMSBLOKS SUBBK
                                            Code 8
    0788 1928 Address      4 FRWUSMHD       Pointer to the DMSUSRM SUBBK Code
                                            9
    078C 1932 Address      4 FRWLDWHD       Pointer to the DMSLDRW SUBBK Code
                                            10
              00000790       FRWSPLEN       *-FRWRK End of the preferred list
          The following pointer will only be utilized if the
          STORCLR command has been issued with the ENDCMD parameter.
          In this case the FRWSTCLR bit in FRWFLG1 will be set to
          one, meaning that OS subpools are to be retained until
          command end and therefore, cannot be anchored on the SVC
          chain. In this case, they will be anchored here instead.
    0790 1936 Address      4 FRWGOSHD       Head of OS SUBBKs when STORECLR
                                            is active
          Storage Management flags
    0794 1940 Bitstring    1 FRWFLG1        Storage Management flag 1
              1... ....      FRWSTCLR       X'80' OS subpools retained until
                                            CMDEND
              .1.. ....      FRWKEYPR       X'40' SET KEYPROTECT is ON
              ..1. ....      FRWCACHE       X'20' DMSFRO has called the SFS
                                            Cache routine
              ...1 ....      FRWNCAPR       X'10' CAPR not issued, NOPAGREL
                                            is on
              .... 1...      FRWEXPAG       X'08' SUBBK free list has extened
                                            pages in use
              .... .1..      FRWSTABN       X'04' DMSFRUAB has been entered
              .... ..1.      FRWNOREL       X'02' DMSFRARP should not issue
                                            DIAG X'10'
              .... ...1      FRWLOREL       X'01' DMSFRARP has updated
                                            FRWLOADR for DIAG
    0795 1941 Bitstring    1 FRWFLG2        DMSFRE internal format of CODE203
              1... ....      FRWFCO         X'80' DMSFREE Conditional request
              .1.. ....      FRWFBR         X'40' DMSFREB Entered via a BALR
              .... 1...      FRWFVR         X'08' DMSFREE variable request
              .... .1..      FRWFNU         X'04' DMSFREE TYPE=NUCLEUS
                                            request
              .... ..1.      FRWFOB         X'02' DMSFREE (not FRET) ==>
                                            CMSSTOR OBTAIN
              .... ...1      FRWFMS         X'01' DMSFREE Display Error
                                            Messages (if any)
    0796 1942 Bitstring    1 FRWFLG3        Diagnostic (Debug) Flag
              1... ....      FRWFRSCL       X'80' 0=DMSFRR calling DMSFRARP,
                                            1=DMSFRS
              .1.. ....      FRWGMPCT       X'40' SET GETMAIN PERCENT is on
              ..1. ....      FRWNOABN       X'20' Override (Ignore) ABENDS
              ...1 ....      FRWMSGOV       X'10' Override MSG=NO requests
              .... 1...      FRWSTOPT       X'08' STOP after displaying Trace
                                            Message
              .... .1..      FRWSKIPI       X'04' Skip DMS1258E error Message
              .... ..1.      FRWFRRTR       X'02' Trace DMSFRR
              .... ...1      FRWFROTR       X'01' Trace DMSFRO
    0797 1943 Bitstring    1 FRWFLG4        Storage Management flag 4
              1... ....      FRWFREEB       X'80' Call was made to DMSFREB
                                            (DMSFREE)
              .1.. ....      FRWROSVC       X'40' DMSFRO was entered via SVC
              ..1. ....      FRWRRSVC       X'20' DMSFRR was entered via SVC
              ...1 ....      FRWRSSVC       X'10' DMSFRS was entered via SVC
              .... 1...      FRWRSDFP       X'08' Fast path requested for
                                            DMSFRSDB
              .... ..1.      FRWFROCO       X'02' DMSFRO was entered as
                                            Conditional
              .... ...1      FRWFRRCO       X'01' DMSFRR was entered as
                                            Conditional
    0798 1944 Bitstring    1 FRWDSPVR       Used for DISP=variable on DMSMSG,
                                            non-zero also means branch to
                                            disabled wait routine
              .... ....      FRWERDSP       X'00' Display a message as a
                                            Error Message
              .... ..11      FRWCPDSP       X'03' Display a message as a CP
                                            Message
              .... .1.1      FRWIODSP       X'05' Display a message with SIO
              .... .111      FRWISDSP       X'07' Display a message with SIO
                                            (more safe)
    0799 1945 Bitstring    1 FRWBALTM       Translation mode, AR or Primary,
                                            on BALR calls on an XC-mode
                                            virtual mach
    079A 1946 Bitstring    1 FRWARCH1       Storage Management Architecture
                                            Flag
              .1.. ....      FRWPPR         X'40' PPR IS AVAILABLE
              ..1. ....      FRWRANGE       X'20' ADDPARTP is operating on
                                            last of range
    079B 1947 Bitstring    1 *              Reserved
          DMSFRR PAGEREL consolidation fields
    079C 1948 Signed       4 FRWRELST       Start addr for PAGEREL
    07A0 1952 Signed       4 FRWRELEN       Ending addr for PAGEREL
          Storage Management Plist Save Areas
    07A4 1956 Bitstring   40 FRWPLST1       Copy of Plist for DMSFRR & DMSFRE
                                            (used only for release)
    07CC 1996 Bitstring   28 FRWPLST2       Copy of Plist for DMSFRS
    07E8 2024 Bitstring   40 FRWPLST3       Plist Work Area for DMSFRU,
                                            DMSFRO, DMSFRA, & DMSFRE (used
                                            only for obtain and FRU)
              00000810       FRWENDPT       *-FRWRK End of Anchor/Data
                                            Section, used to zero the above
                                            fields with an XC
                        External Routine Save Area
          Usage:
              FRWEXTSV is reserved to be used by external routines
              that are called by the storage manager.
            Entry Points:
              None
            Subroutines:
              1) Save area for DMSJCS when called by DMSFRG
    0810 2064 Signed       4 FRWEXTSV (18)  Fixed External Save Area
          STMG Entry Point Addresses (filled in by DMSFRIIN)
          NOTES      : These addresses are in a specific order so that
                they may be initialized via a single MVC by DMSFRI.
                Additions or deletions from FRIFRUEP in DMSFRI must
                also be made here so that the table in DMSFRI is
                identical to this table.
    0858 2136 Signed       4 FRWFRUEP (0)   DMSFRU EP Table
    0858 2136 Address      4 FRWFRUAB       Address of Entry Point DMSFRUAB
    085C 2140 Address      4 FRWFRUCL       Address of Entry Point DMSFRUCL
    0860 2144 Address      4 FRWFRUFS       Address of Entry Point DMSFRUFS
    0864 2148 Address      4 FRWFRUMX       Address of Entry Point DMSFRUMX
    0868 2152 Address      4 FRWFRUOS       Address of Entry Point DMSFRUOS
    086C 2156 Address      4 FRWFRISK       Address of Entry Point DMSFRISK
    0870 2160 Address      4 FRWFRUST       Address of Entry Point DMSFRUST
    0874 2164 Address      4 FRWFRUGP       Address of Entry Point DMSFRUGP
    0878 2168 Address      4 FRWFRMCK       Address of Entry Point DMSFRMCK
    087C 2172 Address      4 FRWFRMDI       Address of Entry Point DMSFRMDI
    0880 2176 Address      4 FRWFRMTR       Address of Trace Exit Entry Point
    0884 2180 Signed       4 FRWGPCNT       SET GETMAIN percentage value when
                                            ON
    0888 2184 Signed       4 FRWFRG14       Used to save DMSFRO return addr
                                            in DMSFRG
    088C 2188 Signed       4 FRWFROBR       Used to save DMSFRO base register
    0890 2192 Bitstring    1 FRWPARTF       Flags to indicate availability of
                                            partial pages above and below
                                            unallocated block
              1... ....      FRWPPTOP       X'80' Part. page above block can
                                            be used
              .1.. ....      FRWPPBOT       X'40' Part. page below block can
                                            be used
              .... 1...      FRWLT4K        X'08' Piece of storage is < 4K
              .... .1..      FRWPPFST       X'04' Allocate first piece on a
                                            partial
    0891 2193 Bitstring    1 FRWPARTS       Place to save FRWPARTF data for
                                            MIN request
    0892 2194 Bitstring    1 * (2)          IBM Reserved
    0894 2196 Signed       4 FRWLINES       STOBK for page just below 16Mb
                                            line
    0898 2200 Signed       4 FRWFRUSV       Place to save R14 for FRUMX and
                                            FRUMS
    089C 2204 Signed       4 *              IBM Reserved
    08A0 2208 Signed       4 FRWSBKPT       Pointer to SUBBK on release with
                                            trace
    08A4 2212 Address      4 FRWSTWRK       Pointer to DMSFRWSW when DMSFRD
                                            is active
                    Storage Management BALR Save Areas
          These Save Areas are utilized to perform nested BALR
          calls within the Storage Management Subsystem. The
          FRWBLSTK pointer, points to the next free BALR Save
          area available. The FRWBLLST field is used to determine
          if we are trying to get a Save Area beyond the maximum
          available. These Save Areas are managed by the DMSFRENT
          and DMSFREXT macros.
          IN THE EVENT THAT ALL SAVE AREAS BECOME FULL:
          When the BALR save stack becomes exhasuted, DMSFRMDI will
          be invoked. For the purpose of debugging, the registers
          of the caller to the routine that blew up will have been
          save in NUCON at FREESAVE. You can inspect:
             R11  =  Address of FRWRK
             R13  =  Address that was beyond the max BALR Save Area
             R14  =  Address of the Caller
             R15  =  Address of the Callee
          In addition, the last two characters of the Entry Point
          Name (or procedure) being invoked
          can be found at:         FRWEPNAM in FRWRK
          and the module name at:  FRWMONAM in FRWRK
          The audit trail of routines that were invoked to
          the point where all BALR Save areas became full
          can be accomplished by inspecting the R14 and R15
          pairs in each of the Save Areas starting at FRWBLSV1.
          If it is determined that the solution to the problem is to
          add additional BALR Save Areas, please insure that they
          are added between the last one currently defined and the
          field:  FRWENDBL as this is the field used to determine
          how many are available.
          Keep in mind that each BALR Save area added will take
          away space currently used for the SUBBK free list.  This
          is not a critical problem as the worst that can happen is
          to cause the free list to acquire an extended page and
          perhaps fragment free storage a bit.
          If for some reason, you attempt to add BALR Save areas
          that extend this control block beyond 4096 bytes an
          assembly error will be generated as a protection
          mechanism.
    08A8 2216 Address      4 FRWFRRRT       Address of invoker of DMSFRRSV or
                                            DMSFRRBx
    08AC 2220 Address      4 FRWFRORT       Address of invoker of DMSFROSV or
                                            DMSFROBx
    08B0 2224 Character    8 FRWMONAM       Module name active if Save Stack
                                            exhausted
    08B8 2232 Character    2 FRWEPNAM       EP name active if Save Stack
                                            exhausted
    08BA 2234 Bitstring    1 * (2)          RESERVED FOR FUTURE IBM USE
    08BC 2236 Signed       4 * (0)          Insure proper alignment
    08BC 2236 Address      4 FRWBLSTK       Pointer to the next free BALR
                                            Save area
    08C0 2240 Address      4 FRWBLLST       Address of the last existing BALR
                                            Save Area
          BALR Save Area for Nesting Level 1
    08C4 2244 Signed       4 FRWBLSV1 (16)  BALR 1 Save Area for Callers regs
              00000040       FRWBLSIZ       *-FRWBLSV1 Size of one FRWRK BALR
                                            Save area
          BALR Save Area for Nesting Level 2
    0904 2308 Signed       4 FRWBLSV2 (16)  BALR 2 Save Area for Callers regs
          BALR Save Area for Nesting Level 3
    0944 2372 Signed       4 FRWBLSV3 (16)  BALR 3 Save Area for Callers regs
          BALR Save Area for Nesting Level 4
    0984 2436 Signed       4 FRWBLSV4 (16)  BALR 4 Save Area for Callers regs
          BALR Save Area for Nesting Level 5
    09C4 2500 Signed       4 FRWBLSV5 (16)  BALR 5 Save Area for Callers regs
              00000A04       FRWENDBL       *-FRWRK End of the DYNAMIC BALR
                                            Save Area
                        Fixed BALR Save Area 1
          Usage:
             Notes      : Because this save area is used by DMSFRE, it must
                   not be used by any routine callable from/in
                   DMSFRO or DMSFRR except in the case of processing
                   the ADDR= or SUBPOOL= parameters on OBTAIN as
                   they are not supported via the DMSFRE interface.
            Entry Points:
              1) DMSFRENT linkage of DMSFREB
              2) 4 byte scratch used by DMSFROEB, called by DMSFREB
              3) 4 byte scratch used by DMSFRREB, called by DMSFREB
              4) DMSFRENT linkage of DMSFRISO
            Subroutines:
              1) DMSFRENT linkage of PARTADDR in DMSFRA
              2) DMSFRENT linkage of FULLADDR in DMSFRA
              3) DMSFRENT linkage of RESVSTOR in DMSFRI
              4) DMSFRENT linkage of FREESTOR in DMSFRI
              5) DMSFRENT linkage of FULLSTOR in DMSFRI
    0A04 2564 Signed       4 FRWFXSV1 (16)  Fixed BALR Save Area 1
    0A44 2628 Signed       4 * (4)          4 Fullword scratch pad
                        Fixed BALR Save Area 2
          Usage:
            Entry Points:
              1) DMSFRENT linkage of DMSFROFP
              2) DMSFRENT linkage of DMSFRUFS
              3) DMSFRENT linkage of DMSFRUGP
            Subroutines:
              1) Save area for callers to ADDPARTP in DMSFRO
              2) DMSFRENT linkage of CHOPBLOK in DMSFRA
              3) DMSFRENT linkage of SPLITBLK in DMSFRR
    0A54 2644 Signed       4 FRWFXSV2 (16)  Fixed BALR Save Area 1
    0A94 2708 Signed       4 * (4)          4 Fullword scratch pad
                        Fixed BALR Save Area 3
          Usage:
            Entry Points:
              1) DMSFRENT linkage of DMSFRRBC
              2) DMSFRENT linkage of DMSFRRBU
              3) DMSFRENT linkage of DMSFRSCB
              4) DMSFRENT linkage of DMSFRSDB
              5) DMSFRENT linkage of DMSFRSRB
            Subroutines:
              None
    0AA4 2724 Signed       4 FRWFXSV3 (16)  Fixed BALR Save Area 1
    0AE4 2788 Signed       4 * (4)          4 Fullword scratch pad
                        Fixed BALR Save Area 4
          Usage:
            Entry Points:
              None
            Subroutines:
              1) DMSFRENT linkage of PARTREL in DMSFRR
    0AF4 2804 Signed       4 FRWFXSV4 (16)  Fixed BALR Save Area 1
    0B34 2868 Signed       4 * (4)          4 Fullword scratch pad
              00000B44       FRWKSIZB       *-FRWRK Size of the Work Area in
                                            bytes
              00000169       FRWKSIZD       (FRWKSIZB+7)/8 Size of the Work
                                            Area in D-Words
              00000B44       FRWLSTOF       * Get LOC for adressability check
              00FFFB43       FRWERRCK       X'7FFFFFFF'-(4096-(FRWLSTOF-FRWRK
                                            ))
          The remainder of the page that contains the work area will
          be carved into SUBBKs and managed as a free list utilized
          by the subpool management routines
    0B44 2884 Bitstring    1 FRWHDISP (0)   Top of the SUBBK's region
              00000B44       FRWSUBFL       *-FRWRK LOC for SUBBK calculation
              000004BC       FRWSUBYT       FRWBIP-FRWSUBFL Bytes in a page -
                                            this location
              00000019       FRWSUBNM       FRWSUBYT/SUBSIZEB Number of
                                            SUBBKs available

#### FRWRK Storage Layout

    *** FRWRK - Master control block for storage management
    *
    *     +-------------------------------------------------------+
    *   0 |                                                       |
    *     =                       FRWSTOAR                        =
    *     |                                                       |
    *     +---------------------------+---------------------------+
    * 738 |         FRWAPATS          |         FRWAPATE          |
    *     +---------------------------+---------------------------+
    * 740 |         FRWISPLB          |         FRWHDG16          |
    *     +---------------------------+---------------------------+
    * 748 |         FRWTLG16          |         FRWHDL16          |
    *     +---------------------------+---------------------------+
    * 750 |         FRWTLL16          |         FRWSUBHD          |
    *     +---------------------------+---------------------------+
    * 758 |         FRWSUBTL          |         FRWISPHD          |
    *     +---------------------------+---------------------------+
    * 760 |         FRWSHAHD          |         FRWGLBHD          |
    *     +---------------------------+---------------------------+
    * 768 |         FRWBLNHD          |         FRWNUCHD          |
    *     +---------------------------+---------------------------+
    * 770 |         FRWUSRHD          |         FRWBLUHD          |
    *     +---------------------------+---------------------------+
    * 778 |         FRWOSSHD          |         FRWDUSHD          |
    *     +---------------------------+---------------------------+
    * 780 |         FRWLDTHD          |         FRWBLSHD          |
    *     +---------------------------+---------------------------+
    * 788 |         FRWUSMHD          |         FRWLDWHD          |
    *     +---------------------------+------+------+------+------+
    * 790 |         FRWGOSHD          |:FLG1 |:FLG2 |:FLG3 |:FLG4 |
    *     +------+------+------+------+------+------+------+------+
    * 798 |:DSPVR|:BALTM|:ARCH1|//////|         FRWRELST          |
    *     +------+------+------+------+---------------------------+
    * 7A0 |         FRWRELEN          |                           |
    *     +---------------------------+                           |
    * 7A8 |                                                       |
    *     =                       FRWPLST1                        =
    *     |                           +---------------------------+
    *     |                           |                           |
    *     +---------------------------+                           |
    * 7D0 |                                                       |
    *     =                       FRWPLST2                        =
    *     |                                                       |
    *     +-------------------------------------------------------+
    * 7E8 |                                                       |
    *     =                       FRWPLST3                        =
    *     |                                                       |
    *     +-------------------------------------------------------+
    * 810 |                                                       |
    *     =                       FRWEXTSV                        =
    *     |                                                       |
    *     +---------------------------+---------------------------+
    * 858 |         FRWFRUAB          |         FRWFRUCL          |
    *     +---------------------------+---------------------------+
    * 860 |         FRWFRUFS          |         FRWFRUMX          |
    *     +---------------------------+---------------------------+
    * 868 |         FRWFRUOS          |         FRWFRISK          |
    *     +---------------------------+---------------------------+
    * 870 |         FRWFRUST          |         FRWFRUGP          |
    *     +---------------------------+---------------------------+
    * 878 |         FRWFRMCK          |         FRWFRMDI          |
    *     +---------------------------+---------------------------+
    * 880 |         FRWFRMTR          |         FRWGPCNT          |
    *     +---------------------------+---------------------------+
    * 888 |         FRWFRG14          |         FRWFROBR          |
    *     +------+------+-------------+---------------------------+
    * 890 |:PARTF|:PARTS|/////////////|         FRWLINES          |
    *     +------+------+-------------+---------------------------+
    * 898 |         FRWFRUSV          |///////////////////////////|
    *     +---------------------------+---------------------------+
    * 8A0 |         FRWSBKPT          |         FRWSTWRK          |
    *     +---------------------------+---------------------------+
    * 8A8 |         FRWFRRRT          |         FRWFRORT          |
    *     +---------------------------+---------------------------+
    * 8B0 |                       FRWMONAM                        |
    *     +-------------+-------------+---------------------------+
    * 8B8 |  FRWEPNAM   |/////////////|         FRWBLSTK          |
    *     +-------------+-------------+---------------------------+
    * 8C0 |         FRWBLLST          |                           |
    *     +---------------------------+                           |
    * 8C8 |                                                       |
    *     =                       FRWBLSV1                        =
    *     |                           +---------------------------+
    *     |                           |                           |
    *     +---------------------------+                           |
    * 908 |                                                       |
    *     =                       FRWBLSV2                        =
    *     |                           +---------------------------+
    *     |                           |                           |
    *     +---------------------------+                           |
    * 948 |                                                       |
    *     =                       FRWBLSV3                        =
    *     |                           +---------------------------+
    *     |                           |                           |
    *     +---------------------------+                           |
    * 988 |                                                       |
    *     =                       FRWBLSV4                        =
    *     |                           +---------------------------+
    *     |                           |                           |
    *     +---------------------------+                           |
    * 9C8 |                                                       |
    *     =                       FRWBLSV5                        =
    *     |                           +---------------------------+
    *     |                           |                           |
    *     +---------------------------+                           |
    * A08 |                                                       |
    *     =                       FRWFXSV1                        =
    *     |                           +---------------------------+
    * A40 |                           |///////////////////////////|
    *     +---------------------------+///////////////////////////|
    *     |///////////////////////////////////////////////////////|
    *     |///////////////////////////+---------------------------+
    *     |///////////////////////////|                           |
    *     +---------------------------+                           |
    * A58 |                                                       |
    *     =                       FRWFXSV2                        =
    *     |                           +---------------------------+
    * A90 |                           |///////////////////////////|
    *     +---------------------------+///////////////////////////|
    *     |///////////////////////////////////////////////////////|
    *     |///////////////////////////+---------------------------+
    *     |///////////////////////////|                           |
    *     +---------------------------+                           |
    * AA8 |                                                       |
    *     =                       FRWFXSV3                        =
    *     |                           +---------------------------+
    * AE0 |                           |///////////////////////////|
    *     +---------------------------+///////////////////////////|
    *     |///////////////////////////////////////////////////////|
    *     |///////////////////////////+---------------------------+
    *     |///////////////////////////|                           |
    *     +---------------------------+                           |
    * AF8 |                                                       |
    *     =                       FRWFXSV4                        =
    *     |                           +---------------------------+
    * B30 |                           |///////////////////////////|
    *     +---------------------------+///////////////////////////|
    *     |///////////////////////////////////////////////////////|
    *     |///////////////////////////+---------------------------+
    *     |///////////////////////////|
    *     +---------------------------+
    *
    *** FRWRK - Master control block for storage management

#### FRWRK Cross Reference

    Symbol         Dspl Value
    -------------- ---- -----
    FRWAPATE       073C
    FRWAPATS       0738
    FRWARCH1       079A
    FRWBALTM       0799
    FRWBIP         0000 00001000
    FRWBIPSH       0000 0000000C
    FRWBLLST       08C0
    FRWBLNHD       0768
    FRWBLSHD       0784
    FRWBLSIZ       08C4 00000040
    FRWBLSTK       08BC
    FRWBLSV1       08C4
    FRWBLSV2       0904
    FRWBLSV3       0944
    FRWBLSV4       0984
    FRWBLSV5       09C4
    FRWBLUHD       0774
    FRWBYMEG       0000 00100000
    FRWCACHE       0794 20
    FRWCOD01       0000 00000001
    FRWCOD02       0000 00000002
    FRWCOD03       0000 00000003
    FRWCOD04       0000 00000004
    FRWCOD05       0000 00000005
    FRWCOD06       0000 00000006
    FRWCOD07       0000 00000007
    FRWCOD08       0000 00000008
    FRWCOD09       0000 00000009
    FRWCOD10       0000 0000000A
    FRWCOD11       0000 0000000B
    FRWCOD78       0000 0000004E
    FRWCOD79       0000 0000004F
    FRWCOD80       0000 00000050
    FRWCOD81       0000 00000051
    FRWCOD82       0000 00000052
    FRWCOD83       0000 00000053
    FRWCOD84       0000 00000054
    FRWCOD85       0000 00000055
    FRWCOD86       0000 00000056
    FRWCOD87       0000 00000057
    FRWCOD88       0000 00000058
    FRWCOD89       0000 00000059
    FRWCOD90       0000 0000005A
    FRWCOD91       0000 0000005B
    FRWCOD92       0000 0000005C
    FRWCOD93       0000 0000005D
    FRWCOD94       0000 0000005E
    FRWCOD95       0000 0000005F
    FRWCOD99       0000 00000063
    FRWCPDSP       0798 03
    FRWDSPVR       0798
    FRWDUSHD       077C
    FRWENDBL       09C4 00000A04
    FRWENDPT       07E8 00000810
    FRWEPNAM       08B8
    FRWERDSP       0798 00
    FRWERRCK       0B34 00FFFB43
    FRWEXPAG       0794 08
    FRWEXTSV       0810
    FRWFBR         0795 40
    FRWFCO         0795 80
    FRWFLG1        0794
    FRWFLG2        0795
    FRWFLG3        0796
    FRWFLG4        0797
    FRWFMS         0795 01
    FRWFNU         0795 04
    FRWFOB         0795 02
    FRWFREEB       0797 80
    FRWFRG14       0888
    FRWFRISK       086C
    FRWFRMCK       0878
    FRWFRMDI       087C
    FRWFRMTR       0880
    FRWFROBR       088C
    FRWFROCO       0797 02
    FRWFRORT       08AC
    FRWFROTR       0796 01
    FRWFRRCO       0797 01
    FRWFRRRT       08A8
    FRWFRRTR       0796 02
    FRWFRSCL       0796 80
    FRWFRUAB       0858
    FRWFRUCL       085C
    FRWFRUEP       0858
    FRWFRUFS       0860
    FRWFRUGP       0874
    FRWFRUMX       0864
    FRWFRUOS       0868
    FRWFRUST       0870
    FRWFRUSV       0898
    FRWFVR         0795 08
    FRWFXSV1       0A04
    FRWFXSV2       0A54
    FRWFXSV3       0AA4
    FRWFXSV4       0AF4
    FRWGLBHD       0764
    FRWGMPCT       0796 40
    FRWGOSHD       0790
    FRWGPCNT       0884
    FRWHDG16       0744
    FRWHDISP       0B44
    FRWHDL16       074C
    FRWIODSP       0798 05
    FRWISDSP       0798 07
    FRWISPHD       075C
    FRWISPLB       0740
    FRWKEYPR       0794 40
    FRWKSIZB       0B34 00000B44
    FRWKSIZD       0B34 00000169
    FRWLDTHD       0780
    FRWLDWHD       078C
    FRWLINES       0894
    FRWLOREL       0794 01
    FRWLSTOF       0B34 00000B44
    FRWLT4K        0890 08
    FRWMEGAL       0000 00F00000
    FRWMEG16       0000 00
    FRWMONAM       08B0
    FRWMSGOV       0796 10
    FRWMS159       0000 0000009F
    FRWMS160       0000 000000A0
    FRWMS161       0000 000000A1
    FRWMS162       0000 000000A2
    FRWMS163       0000 000000A3
    FRWMS164       0000 000000A4
    FRWMS165       0000 000000A5
    FRWMS166       0000 000000A6
    FRWMS167       0000 000000A7
    FRWMS816       0000 00000330
    FRWMS817       0000 00000331
    FRWMS818       0000 00000332
    FRWMS819       0000 00000333
    FRWMS820       0000 00000334
    FRWMS821       0000 00000335
    FRWMXCOD       0000 00000007
    FRWMXFGT       0000 00000007
    FRWMXFLT       0000 00000006
    FRWMXLGT       0000 00000003
    FRWMXLLT       0000 00000001
    FRWMXPGT       0000 00000005
    FRWMXPLT       0000 00000004
    FRWMXTGT       0000 00000002
    FRWMXTLT       0000 00000000
    FRWM1127       0000 00000467
    FRWNCAPR       0794 10
    FRWNOABN       0796 20
    FRWNOREL       0794 02
    FRWNUCHD       076C
    FRWNUCKY       0000 F0
    FRWOSSHD       0778
    FRWPAGAL       0000 00FFF000
    FRWPARTF       0890
    FRWPARTS       0891
    FRWPATND       0000 00000738
    FRWPGMEG       0000 00000100
    FRWPLST1       07A4
    FRWPLST2       07CC
    FRWPLST3       07E8
    FRWPNOAL       0000 00000FFF
    FRWPPBOT       0890 40
    FRWPPFST       0890 04
    FRWPPR         079A 40
    FRWPPTOP       0890 80
    FRWRANGE       079A 20
    FRWRELEN       07A0
    FRWRELST       079C
    FRWROSVC       0797 40
    FRWRRSVC       0797 20
    FRWRSDFP       0797 08
    FRWRSSVC       0797 10
    FRWSBKPT       08A0
    FRWSHAHD       0760
    FRWSKIPI       0796 04
    FRWSPLEN       078C 00000790
    FRWSPLTB       0764
    FRWSTABN       0794 04
    FRWSTCLR       0794 80
    FRWSTOAR       0000
    FRWSTONM       0000 0000004D
    FRWSTOPT       0796 08
    FRWSTOSP       0000 00000738
    FRWSTWRK       08A4
    FRWSUBFL       0B44 00000B44
    FRWSUBHD       0754
    FRWSUBNM       0B44 00000019
    FRWSUBPG       0000 00000055
    FRWSUBTL       0758
    FRWSUBYT       0B44 000004BC
    FRWTLG16       0748
    FRWTLL16       0750
    FRWUSMHD       0788
    FRWUSRHD       0770
    FRWUSRKY       0000 E0

This information is based on z/VM V5R2.0.
Last updated on 6 Dec 2005 at 15:33:56 EDT.
Copyright IBM Corporation, 1990, 2005