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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. |
BPLBK
Cross Reference (Contains links to field and bit definitions)
BPLBK Prolog
NAME : HCPBPLBK
DESCRIPTION: *BLOCKIO parameter list dsect
DSECT : BPLBK
FUNCTION : This DSECT maps the input parameter list sent
by the guest to CP when the guest requests a
multiple block I/O operation from *BLOCKIO
LOCATED BY : SNDPLADR in SNDBK
CREATED BY : HCPBIMMS (who copies the guest's parameter
list into host storage)
DELETED BY : HCPBIMMS
SERIALIZED : Unique task execution
VMDBK dispatch lock.
BLOCKIO lock
Notes : When the guest sends the address in guest storage
of this parameter list, it may not be word-aligned.
This DSECT assumes that before any fields are
referenced, the parameter list has been moved into
host storage and been word-aligned. References
to address fields will cause an exception if this
is not the case.
BPLBK Control Block Content
BPLBK DSECT
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure BPLBK *BLOCKIO parameter list dsect 0000 0 Signed 4 * (0) 0000 0 Bitstring 1 BPLRQCOD Request code 00000001 BPLWRITE X'01' Write request 00000002 BPLREAD X'02' Read request 0001 1 Bitstring 1 BPLRETCD Return code for this operation 0002 2 Bitstring 2 * Reserved for IBM use 0004 4 Address 4 BPLBUFAD Guest real address of data buffer 0008 8 Signed 4 BPLBKNUM Block number 000C 12 Signed 4 * Reserved for IBM use 0010 16 Signed 4 BPLNXENT (0) Next entry in p-list starts here 00000002 BPLSIZE (*-BPLBK+7)/8 Size, in doublewords, of BPLBK
BPLBK Storage Layout
*** BPLBK - *BLOCKIO parameter list dsect * * +------+------+-------------+---------------------------+ * 0 |:RQCOD|:RETCD|/////////////| BPLBUFAD | * +------+------+-------------+---------------------------+ * 8 | BPLBKNUM |///////////////////////////| * +---------------------------+---------------------------+ * 10 | | * = BPLNXENT = * | | * +-------------------------------------------------------+ * *** BPLBK - *BLOCKIO parameter list dsect
BPLBK Cross Reference
(contains links to field and bit definitions)Symbol Dspl Value -------------- ---- -----BPLBKNUM 0008
BPLBUFAD 0004
BPLNXENT 0010
BPLREAD 0000 00000002
BPLRETCD 0001
BPLRQCOD 0000
BPLSIZE 0010 00000002
BPLWRITE 0000 00000001
Last updated on 3 Aug 1999 at 11:43:10 EDT.
Copyright IBM Corporation, 1990, 1999