$AMSG Back to Index page
Control Block Contents 
Storage Layout 
Cross Reference (Contains links to field and bit definitions)
Programming Interface Information:
This information is NOT intended to be
used as Programming Interfaces of z/VM.

  $AMSG Prolog Top of page
 DESCRIPTION: Relocation mapping for HCPAMSG
 DSECT      : $AMSG
 FUNCTION   : LGRAMSG describes those fields of the AMSG block
              that will be relocated to the destination system
              during guest relocation.
 LOCATED BY : This is a mapping of the RDODATA area within the
              RDOBK during guest relocation.
 DELETED BY : HCPRLDRL - Release storage associated with an RDP
 RELOCATION CONSIDERATIONS : This control block is used during live guest
              relocation.  It is used to relocate a control block
              defined in a corresponding HCP COPY file.  Any
              fields or bits defined in HCPAMSG which are
              required on the destination system must be defined
              here, and code must be added to migrate the field
              or bit during a relocation.
  $AMSG Control Block Content Top of page

 $AMSG DSECT Top of page
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure $AMSG Relocation mapping for HCPAMSG 00000001 $AMSG_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 $AMSG_HDRL Header length (in bytes) 0002 2 Signed 2 $AMSG_BITL Length of mapped bits (in bytes) 0004 4 Signed 4 * Reserved for future use 00000008 $AMSG_HDLN *-$AMSG Length of header (bytes) Bit map: Contains the AMSG flags that are subject to relocation. These bits are defined sequentially, regardless of how they are defined in HCPAMSG. 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 $AMSG_BITS (0) Bit map area 00000000 $AMSG_BLEN *-$AMSG_BITS Length of bit map area Data: Contains all HCPAMSG 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. 0008 8 Bitstring 1 $AMSG_DATA (0) Start of data map 0008 8 Bitstring 4 $AMSGNEXT Pointer to next AMSG block 000C 12 Bitstring 4 $AMSGBKID IDs storage area as an AMSG block 0010 16 Bitstring 4 $AMSGTLG Length of entire message HDR+MSG 0014 20 Bitstring 4 $AMSGMGID Message ID 0018 24 Bitstring 2 $AMSGLGH Length of the message 001A 26 Bitstring 1 $AMSGEVST Asynchronous Event status 001B 27 Bitstring 1 $AMSGSESS Session ID 001C 28 Bitstring 1 $AMSGBUF (0) Message buffer contents 0000001C $AMSG_LEN *-$AMSG Total length, in bytes 00000004 $AMSG_SZ ($AMSG_LEN+7)/8 Size in doublewords
  $AMSG Storage Layout Top of page
*** $AMSG - Relocation mapping for HCPAMSG
*     +-------------+-------------+---------------------------+
*   0 | $AMSG_HDRL  | $AMSG_BITL  |///////////////////////////|
*     +-------------+-------------+---------------------------+
*   8 |        $AMSGNEXT          |        $AMSGBKID          |
*     +---------------------------+---------------------------+
*  10 |         $AMSGTLG          |        $AMSGMGID          |
*     +-------------+------+------+---------------------------+
*  18 |  $AMSGLGH   |(01A) |(01B) |
*     +-------------+------+------+
*** $AMSG - Relocation mapping for HCPAMSG
  $AMSG Cross Reference Top of page
Symbol         Dspl Value
-------------- ---- -----
$AMSG_BITL     0002
$AMSG_BITS     0008
$AMSG_BLEN     0008 00000000
$AMSG_DATA     0008
$AMSG_HDLN     0004 00000008
$AMSG_HDRL     0000
$AMSG_LEN      001C 0000001C
$AMSG_SZ       001C 00000004
$AMSG_VER      0000 00000001
$AMSGBKID      000C
$AMSGBUF       001C
$AMSGEVST      001A
$AMSGLGH       0018
$AMSGMGID      0014
$AMSGNEXT      0008
$AMSGSESS      001B
$AMSGTLG       0010
This information is based on z/VM 6.3.0 Last updated on 22 May 2013 at 13:56:33 EDT.
Copyright IBM Corporation, 1990, 2013