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

MMABK

Prolog  

Control Block Contents  
   MMABK DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  


MMABK Prolog

 NAME       : HCPMMABK
 DESCRIPTION: ISFC Device Extension for MMC devices
 DSECT      : MMABK
 FUNCTION   : This DSECT maps information for one of the ISFC link
              devices on a Microchannel to Mainframe Connection.
 LOCATED BY : LDVEXTBK  points to the MMABK for that device.
              MMCWRDEV  points to the MMABK for the output device.
              MMCRDDEV  points to the MMABK for the input device.
 CREATED BY : HCPMMC    when a new link is activated.
 DELETED BY : HCPMMC    when a link is deactivated.
 SERIALIZED : The ISFC Global Lock (HCPBDSGL).
              The ISFC LNKBK lock (LNKLKWRD).
 COMMENTS   : None

 

MMABK Control Block Content


MMABK DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      MMABK          ISFC Device Extension for MMC
                                        devices
     Higher-Level Objects (Link and device).
0000    0 Address      4 MMAMMCBK       Address of MMC link block
0004    4 Address      4 MMALDVBK       Address of ISFC device extension
     Device status.
0008    8 Signed       4 MMADEVNO       Real device address
000C   12 Signed       4 MMAMSNUM       Most recent msg number
0010   16 Bitstring    1 MMASTAT        Latest operation attempted
          00000001       LNKIDLE        1 - Idle
          00000002       LNKBUSY        2 - Busy
          00000003       LNKWRITE       3 - Write in progress
          00000004       LNKREAD        4 - Read in progress
          00000005       LNKRESET       5 - Reset in progress
          00000006       LNKATTN        6 - Handling link attention
          00000007       LNKFATAL       7 - Fatal I/O on link
          00000008       LNKINIT        8 - Initialization in progress
          00000008       LNKDEACT       8 - Deactivation in progress
          00000000       *
0011   17 Bitstring    1 MMANEXT        Next operation to be started
          00000001       LNKIDLE        1 - Idle
          00000002       LNKBUSY        2 - Busy
          00000003       LNKWRITE       3 - Write in progress
          00000004       LNKREAD        4 - Read in progress
          00000005       LNKRESET       5 - Reset in progress
          00000006       LNKATTN        6 - Handling link attention
          00000007       LNKFATAL       7 - Fatal I/O on link
          00000008       LNKINIT        8 - Initialization in progress
          00000008       LNKDEACT       8 - Deactivation in progress
          00000000       *
0012   18 Bitstring    1 MMAPEND        I/O Pending Flags:
          1... ....      MMAIOACT       X'80' - I/O is active on this
                                        device
          .1.. ....      MMARQSEM       X'40' - SEM is required on this
                                        device
0013   19 Bitstring    1 *              Reserved
0014   20 Signed       4 MMARETRY       Retry counter
     ORB for this device.
0018   24 Bitstring   12 MMAORB (0)     ORB for I/O requests
0018   24 Signed       4 MMARET         ORB User Parm (I/O Return Addr)
001C   28 Bitstring    4 MMAREQ         ORB Request Flags
0020   32 Address      4 MMACPA         ORB Channel Program Address
     Interrupt information for this device.
0024   36 Address      4 MMAIRB         Latest IRBLK address
0028   40 Address      4 MMASNS         Latest SNSBK address
002C   44 Signed       4 MMAIORC        Latest I/O Return Code
0030   48 Address      4 MMACCWX        Last CCW expected
0034   52 Address      4 MMACCWF        Failing CCW Address
     Work area for this device.
0038   56 Dbl-Word     8 MMABUFF (8)    Space for a work buffer
          00000078       MMABKLEN       *-MMABK Size of MMABK in bytes
          0000000F       MMASIZE        (*-MMABK+7)/8 Size of MMABK in
                                        doublewords

 

MMABK Storage Layout

          
*** MMABK - ISFC Device Extension for MMC devices
*
*     +---------------------------+---------------------------+
*   0 |         MMAMMCBK          |         MMALDVBK          |
*     +---------------------------+---------------------------+
*   8 |         MMADEVNO          |         MMAMSNUM          |
*     +------+------+------+------+---------------------------+
*  10 |:STAT |:NEXT |:PEND |//////|         MMARETRY          |
*     +------+------+------+------+---------------------------+
*  18 |          MMARET           |          MMAREQ           |
*     +---------------------------+---------------------------+
*  20 |          MMACPA           |          MMAIRB           |
*     +---------------------------+---------------------------+
*  28 |          MMASNS           |         MMAIORC           |
*     +---------------------------+---------------------------+
*  30 |         MMACCWX           |         MMACCWF           |
*     +---------------------------+---------------------------+
*  38 |                                                       |
*     =                       MMABUFF                         =
*     |                                                       |
*     +-------------------------------------------------------+
*  78
*
*** MMABK - ISFC Device Extension for MMC devices

 

MMABK Cross Reference

Symbol         Dspl Value
-------------- ---- -----
*              0010 00000000
*              0011 00000000
LNKATTN        0010 00000006
LNKATTN        0011 00000006
LNKBUSY        0010 00000002
LNKBUSY        0011 00000002
LNKDEACT       0010 00000008
LNKDEACT       0011 00000008
LNKFATAL       0010 00000007
LNKFATAL       0011 00000007
LNKIDLE        0010 00000001
LNKIDLE        0011 00000001
LNKINIT        0010 00000008
LNKINIT        0011 00000008
LNKREAD        0010 00000004
LNKREAD        0011 00000004
LNKRESET       0010 00000005
LNKRESET       0011 00000005
LNKWRITE       0010 00000003
LNKWRITE       0011 00000003
MMABKLEN       0038 00000078
MMABUFF        0038
MMACCWF        0034
MMACCWX        0030
MMACPA         0020
MMADEVNO       0008
MMAIOACT       0012 80
MMAIORC        002C
MMAIRB         0024
MMALDVBK       0004
MMAMMCBK       0000
MMAMSNUM       000C
MMANEXT        0011
MMAORB         0018
MMAPEND        0012
MMAREQ         001C
MMARET         0018
MMARETRY       0014
MMARQSEM       0012 40
MMASIZE        0038 0000000F
MMASNS         0028
MMASTAT        0010

This information is based on z/VM V4R1.0.
Last updated on 5 Jun 2001 at 14:25:15 EDT.
Copyright IBM Corporation, 1990, 2001