MCEBK Back to Index page
 
Prolog 
Control Block Contents 
   MCEBK DSECT
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.


  MCEBK Prolog Top of page
  
 NAME       : HCPMCEBK
 DESCRIPTION: Machine-Check Extended Save Area
 DSECT      : MCEBK
 FUNCTION   : Maps the Machine-Check Extended Save Area
 LOCATED BY : PF2MCESA field in PFXPG (host page 1)
              UOPMCESA field in UZPAG (guest page 1)
 CREATED BY : HCPMPSON when storage required by a processor
              is obtained.
 DELETED BY : HCPMPSOF when storage required by a processor
              is de-allocated.
 REFERENCES : None
 SERIALIZED : Guest MCEBK-
              System VMDBK Dispatch Lock
              Host MCEBK-
              Processor local or recovery processor for
              checkstopped processors.
 RELOCATION CONSIDERATIONS : None -  Guest MCEBK resides in guest
              memory so it is relocated during
              memory move.
 COMPATIBILITY AND MIGRATION CONCERNS : The format of this control block is defined
              by the z/Architecture CPU Architecture.
 
 
  MCEBK Control Block Content Top of page
  




 MCEBK DSECT
Top of page


Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      MCEBK          Machine-Check Extended Save Area
      First 1024 bytes: Vector register logout area
0000    0 Dbl-Word     8 MCEVRS (64)    VR0-31
0200  512 Bitstring  512 *              Reserved for IBM use
      Second 1024 bytes: Guarded-storage register logout area
0400 1024 Bitstring   32 MCEGSCB        Guarded-storage controls
0420 1056 Bitstring  480 *              Reserved for IBM use
0600 1536 Bitstring  512 *              Reserved for IBM use
          00000800       MCEBKLEN       *-MCEBK MCEBK length
          00000100       MCEBKSIZ       (MCEBKLEN+7)/8 MCEBK size in
                                        doublewords
 
 
  MCEBK Storage Layout Top of page
  
          
*** MCEBK - Machine-Check Extended Save Area
*
*     +-------------------------------------------------------+
*   0 |                                                       |
*     =                        MCEVRS                         =
*     |                                                       |
*     +-------------------------------------------------------+
* 200 |///////////////////////////////////////////////////////|
*     =///////////////////////////////////////////////////////=
*     |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
* 400 |                                                       |
*     =                       MCEGSCB                         =
*     |                                                       |
*     +-------------------------------------------------------+
* 420 |///////////////////////////////////////////////////////|
*     =///////////////////////////////////////////////////////=
*     |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
* 600 |///////////////////////////////////////////////////////|
*     =///////////////////////////////////////////////////////=
*     |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
* 800
*
*** MCEBK - Machine-Check Extended Save Area
 
 
  MCEBK Cross Reference Top of page
  
 
Symbol         Dspl Value
-------------- ---- -----
MCEBKLEN       0600 00000800
MCEBKSIZ       0600 00000100
MCEGSCB        0400
MCEVRS         0000
 
This information is based on z/VM 7.3.0 Last updated on 22 Jun 2022 at 15:52:33 EDT.
Copyright IBM Corporation, 1990, 2022