Programming Interface Information:
This information is NOT intended to be
used as Programming Interfaces of z/VM. |
LDVBK
Control Block Contents
LDVBK DSECT
Cross Reference (Contains links to field and bit definitions)
LDVBK Prolog
NAME : HCPLDVBK DESCRIPTION: ISFC Link Device Extension DSECT : LDVBK FUNCTION : This block is used to maintain status information for a single physical link device. The LNKBK contains a table pointing to all active LDVBK blocks. LOCATED BY : LNKDEVTB (array of pointers). LNKDEVCT contains the number of active devices, and LNKDEVMX is equated to the maximum number that one link can support. RDEVCFDV (pointer). CREATED BY : Operation of the 'ACTIVATE ISLINK' command. DELETED BY : Operation of the 'DEACTIVE ISLINK' command. SERIALIZED : The associated LNKBK lock (LNKLKWRD) must be held in order to update the LNKBK (in general). Some fields are associated with I/O and are serialized by the associated RDEV lock instead.
LDVBK Control Block Content
LDVBK DSECT
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure LDVBK ISFC Link Device Extension Device identification and linkage. 0000 0 Character 4 LDVDEVID Printable hex device number 0004 4 Signed 4 LDVDEVNO Real device address 0008 8 Address 4 LDVLNKBK Base LNKBK addr (Hold RDEV lock) 000C 12 Signed 4 LDVDEVIX Link Device Index (0..n) 0010 16 Address 4 LDVRDEV RDEV address 0014 20 Address 4 LDVEXTBK Line Driver extension address Device status. 0018 24 Bitstring 1 LDVDVFLG Device Flag 1... .... LDVDVATT X'80' - This device is ATTACHED .1.. .... LDVDVAPL X'40' - Attach Process lock is held ..1. .... LDVDVLCK X'20' - RDEV lock is held 0019 25 Bitstring 1 LDVIOPND I/O Pending Status 1... .... LDVSIOPD X'80' - Start Pending .1.. .... LDVINTPD X'40' - Interrupt Pending 001A 26 Bitstring 6 * Reserved Low level I/O activity. 0020 32 Address 4 LDVIORBK IORBK for outgoing I/O 0024 36 Address 4 LDVIORRF IORBK for interrupt reflection 0028 40 Signed 4 LDVUPARM Latest ORB User PARM value 002C 44 Bitstring 4 * Reserved Work area for use by the interrupt handler. Notes : This area is serialized by the RDEV lock. 0030 48 Dbl-Word 8 LDVIWRK (0) Space for LDVIWRK0-LDVIWRK9 0030 48 Signed 4 LDVIWRK0 Work area 0034 52 Signed 4 LDVIWRK1 Work area 0038 56 Signed 4 LDVIWRK2 Work area 003C 60 Signed 4 LDVIWRK3 Work area 0040 64 Signed 4 LDVIWRK4 Work area 0044 68 Signed 4 LDVIWRK5 Work area 0048 72 Signed 4 LDVIWRK6 Work area 004C 76 Signed 4 LDVIWRK7 Work area 0050 80 Signed 4 LDVIWRK8 Work area 0054 84 Signed 4 LDVIWRK9 Work area 0000000B LDVSIZE (*-LDVBK+7)/8 Size, in doublewords, of LDVBK
LDVBK Storage Layout
*** LDVBK - ISFC Link Device Extension * * +---------------------------+---------------------------+ * 0 | LDVDEVID | LDVDEVNO | * +---------------------------+---------------------------+ * 8 | LDVLNKBK | LDVDEVIX | * +---------------------------+---------------------------+ * 10 | LDVRDEV | LDVEXTBK | * +------+------+-------------+---------------------------+ * 18 |:DVFLG|:IOPND|/////////////////////////////////////////| * +------+------+-------------+---------------------------+ * 20 | LDVIORBK | LDVIORRF | * +---------------------------+---------------------------+ * 28 | LDVUPARM |///////////////////////////| * +---------------------------+---------------------------+ * 30 | LDVIWRK0 | LDVIWRK1 | * +---------------------------+---------------------------+ * 38 | LDVIWRK2 | LDVIWRK3 | * +---------------------------+---------------------------+ * 40 | LDVIWRK4 | LDVIWRK5 | * +---------------------------+---------------------------+ * 48 | LDVIWRK6 | LDVIWRK7 | * +---------------------------+---------------------------+ * 50 | LDVIWRK8 | LDVIWRK9 | * +---------------------------+---------------------------+ * 58 * *** LDVBK - ISFC Link Device Extension
LDVBK Cross Reference
Symbol Dspl Value -------------- ---- ----- LDVDEVID 0000 LDVDEVIX 000C LDVDEVNO 0004 LDVDVAPL 0018 40 LDVDVATT 0018 80 LDVDVFLG 0018 LDVDVLCK 0018 20 LDVEXTBK 0014 LDVINTPD 0019 40 LDVIOPND 0019 LDVIORBK 0020 LDVIORRF 0024 LDVIWRK 0030 LDVIWRK0 0030 LDVIWRK1 0034 LDVIWRK2 0038 LDVIWRK3 003C LDVIWRK4 0040 LDVIWRK5 0044 LDVIWRK6 0048 LDVIWRK7 004C LDVIWRK8 0050 LDVIWRK9 0054 LDVLNKBK 0008 LDVRDEV 0010 LDVSIOPD 0019 80 LDVSIZE 0054 0000000B LDVUPARM 0028
Last updated on 5 Jun 2001 at 14:03:52 EDT.
Copyright IBM Corporation, 1990, 2001