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Programming Interface Information:
This information is NOT intended to be
used as Programming Interfaces of z/VM. |
MMABK
Control Block Contents
MMABK DSECT
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
Last updated on 5 Jun 2001 at 14:25:15 EDT.
Copyright IBM Corporation, 1990, 2001