Programming Interface Information:
This information is NOT intended to be
used as Programming Interfaces of z/VM. |
PAG39
Control Block Contents
PAG39 DSECT
Cross Reference (Contains links to field and bit definitions)
PAG39 Prolog
Name : HCPPAG39 Description: ESA/390 Page Table Entry DSECT : PAG39 Function : A Page Table Entry is a hardware architected area that describes one 4K page of virtual storage.
PAG39 Control Block Content
PAG39 DSECT
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure PAG39 ESA/390 Page Table Entry 0000 0 Signed 4 PAGENTRY ESA/390 Page Table Entry 00000004 PAGLENTH *-PAGENTRY Length of 1 ESA/390 PTE 0004 4 Signed 4 PAGNEXT (0) Next ESA/390 Page Table Entry 0000 0 Bitstring 1 * Bits 1-7 of the page frame real address. Bit 0 must be 0 in a valid ESA/390 PTE. 0001 1 Bitstring 1 * Bits 8-15 of the page frame real address. 0002 2 Bitstring 1 PAGSTAT Bits 0, 20, and 23 must be zero. .... .1.. PAGINVAL X'04' Page Table Entry is invalid .... ..1. PAGPROT X'02' PTE is page protected (read only) 0003 3 Bitstring 1 * Reserved
PAG39 Storage Layout
*** PAG39 - ESA/390 Page Table Entry * * +---------------------------+ * 0 | PAGENTRY | * +---------------------------+ * *** PAG39 - ESA/390 Page Table Entry *** Overlay for PAGENTRY in PAG39 * * +------+------+------+------+ * 0 |//////|//////|:STAT |//////| 4 * +------+------+------+------+ * *** Overlay for PAGENTRY in PAG39
PAG39 Cross Reference
Symbol Dspl Value -------------- ---- ----- PAGENTRY 0000 PAGINVAL 0002 04 PAGLENTH 0000 00000004 PAGNEXT 0004 PAGPROT 0002 02 PAGSTAT 0002
Last updated on 5 Jun 2001 at 16:03:39 EDT.
Copyright IBM Corporation, 1990, 2001