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Programming Interface Information:
This information is NOT
intended to be
used as Programming Interfaces of VM/ESA. It is to be used for diagnosis only. |
IOCM
Cross Reference (Contains links to field and bit definitions)
IOCM Prolog
NAME : HCPIOCM
DESCRIPTION: I/O Completion Block
DSECT : IOCM
FUNCTION : Describes the completion of an I/O request.
LOCATED BY : Pointer (VDEVAEVT) in the Virtual Device Block
Pointer (VDEVREVT) in the Virtual Device Block
Pointer (RDEVUSLP) in the Real Device Block
NOTES : Modules including this Control Block, must also include
HCPIRBLK.
CREATED BY : HCPAMR - Message Read Task
HCPSVIAP - Reflect message to VDEV
HCPTERQS - Build IOCM for unsolicited unit check and queue
it on RDEVUSLQ
DELETED BY : HCPAEPPD - Purge all outstanding AEBK, AMSG and IOCM blocks
for the Virtual Device.
HCPAMR - Message Read Task - only purges IOCMs on
RDEVUSLP
IOCM Control Block Content
IOCM DSECT
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure IOCM I/O Completion Block 0000 0 Address 4 IOCMNEXT Pointer to the next IOCM Block NOTE: Field must be at same offset as 'AMSGNEXT' 0004 4 Character 4 IOCMBKID Identifies storage area as an IOCM. NOTE: Field must be at same offset as 'AMSGBKID' 0008 8 Signed 2 IOCMSCNT Sense data count 000A 10 Bitstring 1 IOCMFLAG Status flag 000B 11 Character 9 * Reserved 0014 20 Character 32 IOCMSNS Sense data. Mapped by HCPSNSBK. 0034 52 Bitstring 0 IOCMIRB Interruption Response Block. Mapped by HCPIRBLK Code for determining IOCM size in Doublewords. 0000000F IOCMSIZE ((*-IOCM)+7)/8 IOCM size in Double-words. Code for Testing/Setting IOCMBKID 00D6C3D4 IOCMID C'IOCM' Used to set block identifier Code for Testing/Setting IOCMFLAG 1... .... IOCMNBST X'80' No broadcast message indicator
IOCM Storage Layout
*** IOCM - I/O Completion Block * * +---------------------------+---------------------------+ * 0 | IOCMNEXT | IOCMBKID | * +-------------+------+------+---------------------------+ * 8 | IOCMSCNT |:MFLAG|//////////////////////////////////| * +-------------+------+//////+---------------------------+ * |///////////////////////////| | * +---------------------------+ | * 18 | | * = IOCMSNS = * | +---------------------------+ * | | | * +---------------------------+ | * 38 | | * = IOCMIRB = * | | * +-------------------------------------------------------+ * 58 |///////////////////////////////////////////////////////| * =///////////////////////////////////////////////////////= * |///////////////////////////+---------------------------+ * |///////////////////////////| * +---------------------------+ * *** IOCM - I/O Completion Block
IOCM Cross Reference
(contains links to field and bit definitions)Symbol Dspl Value -------------- ---- -----IOCMBKID 0004
IOCMFLAG 000A
IOCMID 0034 00D6C3D4
IOCMIRB 0034
IOCMNBST 0034 80
IOCMNEXT 0000
IOCMSCNT 0008
IOCMSIZE 0034 0000000F
IOCMSNS 0014
Last updated on 3 Aug 1999 at 12:05:54 EDT.
Copyright IBM Corporation, 1990, 1999