Programming Interface Information:
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used as Programming Interfaces of z/VM. |
XSUBK
Control Block Contents
XSUBK DSECT
Cross Reference (Contains links to field and bit definitions)
XSUBK Prolog
NAME : HCPXSUBK DESCRIPTION: Expanded Storage Usability Map DSECT : XSUBK FUNCTION : This map is used to keep track of the allocation of Expanded Storage. Each map corresponds to one increment of XSTORE and can therefore represent up to 64Meg of expanded storage. LOCATED BY : XDRUMAPT located in the HCPXDRBK. CREATED BY : HCPESCDI during initialization processing. DELETED BY : HCPESCDI if no expanded storage is configured to the system.
XSUBK Control Block Content
XSUBK DSECT
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure XSUBK Expanded Storage Usability Map The following are bit maps that represents the allocation of one increment of Expanded Storage (up to 64 megabytes). Each bit position represents the allocation state of a block of XSTORE. 0000 0 Bitstring 1 XSUALMAP (2048) XSTORE availability map. When a bit's value is "1" then the corresponding block is allocated. 0800 2048 Bitstring 1 XSUERMAP (2048) XSTORE error map. When a bit's value is "1" then the corresponding block is in error.
XSUBK Storage Layout
*** XSUBK - Expanded Storage Usability Map * * +-------------------------------------------------------+ * 0 | | * = XSUALMAP = * | | * +-------------------------------------------------------+ * 800 | | * = XSUERMAP = * | | * +-------------------------------------------------------+ *1000 * *** XSUBK - Expanded Storage Usability Map
XSUBK Cross Reference
Symbol Dspl Value -------------- ---- ----- XSUALMAP 0000 XSUERMAP 0800
Last updated on 5 Jun 2001 at 17:21:45 EDT.
Copyright IBM Corporation, 1990, 2001