Programming Interface Information:
This information is NOT intended to be used as Programming Interfaces of z/VM. |
LEDA
Control Block Contents
LEDA DSECT
Cross Reference (Contains links to field and bit definitions)
LEDA Prolog
Name : HCPLEDA Description: Locate Record Extended data area DSECT : LEDA Function : Maps the contents of the Locate Record Extended data area. Located by : HCCWADDR - The Locate Record Extended CCW data address field contains the address of the locate record extended data area. Created by : Storage for this control block cannot be specifically allocated/deallocated using HCPGETST/HCPRELST. Track cache manager - Data area is part of a larger free storage area used to build ECKD channel programs which is allocated in modules HCPFTU/HCPFTP. Deleted by : Storage for this control block cannot be specifically allocated/deallocated using HCPGETST/HCPRELST. Track cache manager - Data area is part of a larger free storage area used to build ECKD channel programs which is deallocated in modules HCPFTU/HCPFTP. Serialized : Track cache manager - TCMTSLK - Track cache lock Comments : Track cache manager - None
LEDA Control Block Content
LEDA DSECT
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure LEDA Locate Record Extended data area 0000 0 Bitstring 16 LEDAREA (0) Locate Record Extended data area Byte 0 (Operation byte) Although defined as BITs, the contents of the operation byte are, architecturally, multiple codes. 0000 0 Bitstring 1 LEDOP Operation byte 11.. .... LEDOR X'C0' Operation byte, bits 0 and 1 ------- Codes for use with LEDOR .... .... LEDORCA X'00' Orient on count area .1.. .... LEDORHA X'40' Orient on home address 1... .... LEDORDA X'80' Orient on data area 11.. .... LEDORIX X'C0' Orient on index ------- ..11 1111 LEDOOC X'3F' Operation byte, bits 2 through 7 ------- Codes for use with LEDOOC .... ...1 LEDOCWD X'01' Write data .... ..11 LEDOCFW X'03' Format write .... .11. LEDOCRD X'06' Read data .... 1.11 LEDOCWT X'0B' Write track .... 11.. LEDOCRT X'0C' Read tracks ...1 .11. LEDOCR X'16' Read ..11 1111 LEDOCX X'3F' Extended Op Code ------- Byte 1 (Auxiliary byte) 0001 1 Bitstring 1 LEDAUX Auxiliary byte 1... .... LEDAVTLF X'80' Validate transfer length factor .... ...1 LEDARCS X'01' Read count suffix Byte 2 (Zeros) 0002 2 Bitstring 1 LEDZEROS Must be zeros Byte 3 (Count) 0003 3 Bitstring 1 LEDCOUNT Count Bytes 4 through 7 (Seek address) 0004 4 Bitstring 4 LEDSEEK (0) Seek address (CCHH) 0004 4 Bitstring 2 LEDSCC CC of CCHH 0006 6 Bitstring 2 LEDSHH HH of CCHH Bytes 8 through 12 (Search argument) 0008 8 Bitstring 5 LEDSRCH (0) Search argument (CCHHR) 0008 8 Bitstring 2 LEDRCC CC of CCHHR 000A 10 Bitstring 2 LEDRHH HH of CCHHR 000C 12 Bitstring 1 LEDRR R of CCHHR Byte 13 (Sector number) 000D 13 Bitstring 1 LEDSECT Sector number 1111 1111 LEDNOSCT X'FF' Sector orientation not performed Bytes 14 and 15 (Transfer length factor) 000E 14 Bitstring 2 LEDTLF Transfer length factor Byte 16 (Reserved) 0010 16 Bitstring 1 LEDRES Reserved for IBM use Byte 17 (Extended Operation) 0011 17 Bitstring 1 LEDEOP Extended Operation .... .... LEDOTHOP X'00' Use operation code in byte 0 .... 1..1 LEDWRANY X'09' Write Any .... 1.1. LEDRDANY X'0A' Read Any .... 111. LEDRDTKS X'0E' Read Trackset ...1 .... LEDPRETS X'10' Prestage Trackset ...1 ...1 LEDWRTKS X'11' Write Trackset ...1 ..11 LEDUWRTK X'13' Update Write Trackset Bytes 18-19 (Extended Parameter Length) 0012 18 Bitstring 2 LEDEPLEN Extended Parameter Length Bytes 20-21 (Extended Parameter) 0014 20 Bitstring 1 LEDEPRM1 Extended Parameter byte 1 0015 21 Bitstring 1 LEDEPRM2 Extended Parameter byte 2 Length equates 00000016 LEDBSIZE *-LEDAREA Size of LEDA in bytes 00000003 LEDSIZE ((*-LEDAREA)+7)/8 Size of LEDA in DWs
LEDA Storage Layout
*** LEDA - Locate Record Extended data area * * +------+------+------+------+-------------+-------------+ * 0 |LEDOP |LEDAUX|:ZEROS|:COUNT| LEDSCC | LEDSHH | * +------+------+------+------+------+------+-------------+ * 8 | LEDRCC | LEDRHH |LEDRR |:SECT | LEDTLF | * +------+------+-------------+------+------+-------------+ * 10 |LEDRES|LEDEOP| LEDEPLEN |:EPRM1|:EPRM2| 16 * +------+------+-------------+------+------+ * *** LEDA - Locate Record Extended data area
LEDA Cross Reference
Symbol Dspl Value -------------- ---- ----- LEDARCS 0001 01 LEDAREA 0000 LEDAUX 0001 LEDAVTLF 0001 80 LEDBSIZE 0015 00000016 LEDCOUNT 0003 LEDEOP 0011 LEDEPLEN 0012 LEDEPRM1 0014 LEDEPRM2 0015 LEDNOSCT 000D FF LEDOCFW 0000 03 LEDOCR 0000 16 LEDOCRD 0000 06 LEDOCRT 0000 0C LEDOCWD 0000 01 LEDOCWT 0000 0B LEDOCX 0000 3F LEDOOC 0000 3F LEDOP 0000 LEDOR 0000 C0 LEDORCA 0000 00 LEDORDA 0000 80 LEDORHA 0000 40 LEDORIX 0000 C0 LEDOTHOP 0011 00 LEDPRETS 0011 10 LEDRCC 0008 LEDRDANY 0011 0A LEDRDTKS 0011 0E LEDRES 0010 LEDRHH 000A LEDRR 000C LEDSCC 0004 LEDSECT 000D LEDSEEK 0004 LEDSHH 0006 LEDSIZE 0015 00000003 LEDSRCH 0008 LEDTLF 000E LEDUWRTK 0011 13 LEDWRANY 0011 09 LEDWRTKS 0011 11 LEDZEROS 0002
Copyright IBM Corporation, 1990, 2001