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Hex Dec Type/Val Lng Label (dup) Comments
---- ---- --------- ---- -------------- --------
0000 0 Structure $SDNX Relocation mapping for HCPSDNX
00000001 $SDN_VER 1 Mapping version number
0000 0 Signed 2 $SDN_HDRL Header length (in bytes)
0002 2 Signed 2 $SDN_BITL Length of mapped bits (in bytes)
0004 4 Signed 4 * Reserved for future use
00000008 $SDN_HDLN *-$SDNX Length of header (bytes)
Bit map: Contains the SDNX flags that are subject to
relocation. These bits are defined sequentially,
regardless of how they are defined in HCPSDNX.
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 $SDN_BITS (0) Bit map area
00000000 $SDN_BLEN *-$SDN_BITS Length of bit map
area
Data: Contains all HCPSDNX 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.
0008 8 Bitstring 1 $SDN_DATA (0) Start of data map
The following bits indicate the presence or absence of
data associated with facilities that maintain state within
the SDNX.
0008 8 Bitstring 1 $SDNFTR0 Features byte 0
1... .... $SDNFGSF X'80' $SDNFGSF GSF register data
present
.1.. .... $SDNFIBM1 X'40' $SDNFIBM1 Already in use by
IBM
0009 9 Bitstring 1 $SDNFTR1 Features byte 1
000A 10 Bitstring 1 $SDNFTR2 Features byte 2
000B 11 Bitstring 1 $SDNFTR3 Features byte 3
000C 12 Bitstring 1 $SDNFTR4 Features byte 4
000D 13 Bitstring 1 $SDNFTR5 Features byte 5
000E 14 Bitstring 1 $SDNFTR6 Features byte 6
000F 15 Bitstring 1 $SDNFTR7 Features byte 7
The following areas are for the data associated with
facilities that maintain state within the SDNX.
0010 16 Bitstring 32 $SDNXGSCB Guarded-storage control block
0030 48 Bitstring 16 $SDNXIBM1 Already in use by IBM
00000040 $SDN_LEN *-$SDNX Total length, in bytes
00000008 $SDN_SZ ($SDN_LEN+7)/8 Size in
doublewords
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