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Hex Dec Type/Val Lng Label (dup) Comments
---- ---- --------- ---- -------------- --------
0000 0 Structure $VDSBK Relocation mapping for HCPVDSBK
00000001 $VDS_VER 1 Mapping version number for this
DSECT. Version is independent of
the CP level and need only be
changed when this DSECT is
changed. The convention is to
increment by 1.
0000 0 Signed 2 $VDS_HDRL Header length (in bytes)
0002 2 Signed 2 $VDS_BITL Length of mapped bits (in bytes)
0004 4 Signed 4 * Reserved for future use
00000008 $VDS_HDLN *-$VDSBK Length of header (bytes)
Bit map: Contains the VDSBK flags that are subject to
relocation. These bits are defined sequentially,
regardless of how they are defined in HCPVDSBK.
This yields a consistent mapping that ensures
compatibility when a guest is relocated between
systems at differing service levels.
Names in the comments column indicate the control
block byte which contains the flag. This name is
subject to change if the flag definition changes.
====> NEVER change bits which already exist here.
====> NEVER change the order of bits in this section.
====> ALWAYS add new bits at the end of this section,
together with new flag bytes as required.
0008 8 Signed 2 $VDS_BITS (0) Bit map area
0008 8 Bitstring 1 $VDS0
1... .... $VDSAUCR X'80' $VDSAUCR VDSCFLG
00000001 $VDS_BLEN *-$VDS_BITS Length of bit map
area
Data: Contains all HCPVDSBK data that is subject to
relocation, except for flag bits, which are
handled separately.
All fields are defined as XLnn to avoid alignment
warnings and to pack the data efficiently.
====> NEVER change fields which already exist here.
====> NEVER change the order of fields in this section.
====> ALWAYS add new fields at the end of this section.
together with new flag bytes as required.
0009 9 Bitstring 1 $VDS_DATA (0) Start of data map
0009 9 Bitstring 4 $VDSVFC VFCBK pointer
000D 13 Bitstring 4 $VDSUCSB UCSB Data Block pointer
00000011 $VDS_LEN *-$VDSBK Total length, in bytes
00000003 $VDS_SZ ($VDS_LEN+7)/8 Size in
doublewords
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