CSRC4DIS — Disconnect the cell storage for an extent

Description

Call the CSRC4DIS cell pool service to disconnect cell storage for a specific extent.

Environment

The requirements for the caller are:

Environmental factor	Requirement
Minimum authorization:	Problem state with PSW key 8-15
Dispatchable unit mode:	Task or SRB
Cross memory mode:	Any PASN, any HASN, any SASN
AMODE:	64-bit addressing mode.
ASC mode:	Primary or AR mode. (If the anchor and the extents are located in a data space, the caller must be in AR mode.)
Interrupt status:	Enabled or disabled for I/O and external interrupts
Locks:	The caller may hold locks, but is not required to hold any.
Control parameters:	Must reside in a single address or data space. They must be in the primary address space or in an address/data space that is addressable through a public entry on the caller's dispatchable unit access list (DU-AL). All parameter areas, including the parameter list, may reside above 2GB.

Programming requirements

If your program is in AR mode, issue the SYSSTATE macro with ASCENV=AR before you call CSRC4DIS so the CALL macro can generate the correct code for AR mode.

As the program must be running in AMODE 64 to call this service, be sure to issue SYSSTATE AMODE64=YES at the point(s) where the program begins running in AMODE 64.

Before you call CSRC4DIS, you must have returned all cells associated with the extent and have called CSRC4DAC to deactivate the extent.

Before you use cell pool services, you can optionally include the CSRC4ASM macro to generate cell pool services equate (EQU) statements. CSRC4ASM provides the following constants for use in your program:

*  Length of the cell pool anchor data area:
*
CSRC4_ANCHOR_LENGTH     EQU     64
*
*
*  Base length of the cell pool extent data area:
*
CSRC4_EXTENT_BASE       EQU     192
*
*
*  Length of the user-supplied pool name:
*
CSRC4_POOL_NAME_LEN     EQU     8
*
*

Restrictions

None.

Input register information

Before calling the CSRC4DIS service, the caller does not have to place any information into any register unless using it in register notation for a particular parameter, or using it as a base register.

Output register information

When control returns to the caller, the 64-bit general purpose registers (GPRs) contain:

Register: Contents
0-1: Used as work registers by the system
2-13: Unchanged
14: Used as a work register by the system
15: Return code in low 32 bits. High 32 bits are used as a work area by the system.

When control returns to the caller, the access registers (ARs) contain:

Register: Contents
0-1: Used as work registers by the system
2-14: Unchanged
15: Used as a work register by the system

Some callers depend on the register contents remaining the same before and after issuing a service. If the system changes the contents of registers on which the caller depends, the caller must save them before issuing the service, and restore them after the system returns control.

Performance implications

None.

Syntax

Write the call as shown on the syntax diagram. You must code all parameters on the CALL statement in the order shown.

Syntax	Description
CALL CSRC4DIS	,(cntl_alet ,anchor_addr ,extent_num ,area_addr ,area_size ,return_code)

Parameters

All input to callable services is in the form of RX-type addresses.

The parameters are explained as follows:

,(cntl_alet: Specifies the fullword variable containing the ALET that identifies the location of the anchor and extents. Initialize the ALET to 0 if your program is running in AR mode and the anchor and extents are in the primary address space. If your program is running in primary ASC mode, the value is ignored, but you must code the parameter anyway.
,anchor_addr: Specifies the doubleword variable containing the address of the 64-byte anchor.
,extent_num: Specifies the fullword variable containing the number of the extent that CSRC4DIS will disconnect. The extent number must be within the range 0 to 65536.
,area_addr: When CSRC4DIS completes, the doubleword variable specified by area_addr contains the address of the disconnected storage area.
,area_size: When CSRC4DIS completes, the doubleword variable specified by area_size contains the size of the disconnected area.
,return_code): When CSRC4DIS completes, the fullword variable specified by return_code contains the return code.

ABEND codes

None.

Return and reason codes

When the CSRC4DIS service returns control to your program, GPR 15 (and return_code) contains one of the following return codes:

Hexadecimal Return Code	Decimal Return Code	Meaning and Action
00	00	Meaning: The operation was successful. Action: None.
1C	28	Meaning: Program error. The anchor address is not valid. Action: Check to see if your program passed the wrong anchor address or inadvertently overlaid the anchor area.
30	48	Meaning: Program error. The extent number is not valid. Action: Make sure the extent number is within the range 0 to 65536.
34	52	Meaning: Program error. You issued the services in the wrong order, or did not issue a necessary service. Action: Call CSRC4DAC to deactivate the extent before calling CSRC4DIS to disconnect the cell storage for the extent.
38	56	Meaning: Program error. The service cannot disconnect the extent because some cells are still allocated. Action: Return all the cells associated with the extent before calling CSRC4DIS to disconnect the cell storage for the extent.
64	100	Meaning: Program or system error. An extent chain was broken. Action: Check to see if your program inadvertently overlaid an extent area. Make sure that no extent belongs to more than one cell pool.
68	104	Meaning: Program or system error. An extent chain is circular. Action: Check to see if your program inadvertently overlaid an extent area. Make sure that no extent belongs to more than one cell pool.
6C	108	Meaning: Program or system error. An extent could not be found. Action: Check to see if your program inadvertently overlaid an extent area. Make sure that the anchor address being passed is for the right cell pool.