Programming Interface Information:
This information is NOT intended to be used as Programming Interfaces of z/VM. |
MLDBK
Control Block Contents
MLDBK DSECT
MLDENTRY DSECT
Cross Reference (Contains links to field and bit definitions)
MLDBK Prolog
NAME : HCPMLDBK DESCRIPTION: Mapping List Definition Block. DSECT : MLDBK FUNCTION : The MLDBK is used to pass parameter for diagnose X'244'. LOCATED BY : MPLMLDBK - contains the address of this block. CREATED BY : Created in the guest virtual machine's storage and copied to VMDVOBUF for CP to use. DELETED BY : Deleted by the guest virtual machine. SERIALIZED : Guest Virtual Machine is responsible. COMMENTS : NONE
MLDBK Control Block Content
MLDBK DSECT
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure MLDBK Mapping List Definition Block. 0000 0 Signed 4 MLDALET ALET specifying the ad- dress space in which the next MLDBK resides. 0004 4 Signed 4 MLDFWDPT Forward pointer to next MLDBK. 0008 8 Signed 4 MLDENTCT Count of entries contained in this block. 000C 12 Signed 4 * Reserved for IBM use. 0010 16 Signed 4 MLDENTR1 (0) First entry in variable list. This is a pool- relative-block-number The following are used to determine the size of the header for this control block. . 00000010 MLDLEN *-MLDBK Length of this control block in bytes. 00000002 MLDSIZE (MLDLEN+7)/8 Size of this control block in doublewords. The following DSECT fields are for the variable data.
MLDENTRY DSECT
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure MLDENTRY Mapping List Definition Block. 0000 0 Signed 4 MLDPRBN An entry that is a pool- relative-block number. 00000004 MLDETLEN *-MLDENTRY Length of the 1st entry. 0004 4 Signed 4 MLDNXTET (0) Next extent in list. 00000400 MLDNMETP 4096/MLDETLEN The number of entries contained in a page. ****************------- 00001000 MLDSZETP MLDETLEN*MLDNMETP Total storage size of all entries that can fit into a page.
MLDBK Storage Layout
*** MLDBK - Mapping List Definition Block. * * +---------------------------+---------------------------+ * 0 | MLDALET | MLDFWDPT | * +---------------------------+---------------------------+ * 8 | MLDENTCT |///////////////////////////| * +---------------------------+---------------------------+ * *** MLDBK - Mapping List Definition Block. *** MLDENTRY - Mapping List Definition Block. * * +---------------------------+ * 0 | MLDPRBN | * +---------------------------+ * *** MLDENTRY - Mapping List Definition Block.
MLDBK Cross Reference
Symbol Dspl Value -------------- ---- ----- MLDALET 0000 MLDENTCT 0008 MLDENTR1 0010 MLDETLEN 0000 00000004 MLDFWDPT 0004 MLDLEN 0010 00000010 MLDNMETP 0004 00000400 MLDNXTET 0004 MLDPRBN 0000 MLDSIZE 0010 00000002 MLDSZETP 0004 00001000
This information is based on z/VM V4R2.0. Last updated on 17 Oct 2001 at 15:42:55 EDT.
Copyright IBM Corporation, 1990, 2001