IRDFSDU — FICON switch data update services

The requirements for the caller are:

None

• No locks may be held
• Must not be in an environment that would prevent EXCP from being issued
• Must be authorized

Register

Contents

0–15

Undefined

Before issuing the IRDFSDU macro, 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.

Some callers depend on 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.

None.

The IRDFSDU macro is written as follows:

The parameters are explained as follows:

name

An optional symbol, starting in column 1, that is the name on the IRDFSDU macro invocation. The name must conform to the rules for an ordinary assembler language symbol.

,TOLERANCE=tolerance

A required input parameter which contains the input tolerance for up-to-date test of last update performed.

To code:Specify the RS-type address or address in register (2)-(12), of an 8 byte field.

,RETCODE=retcode

An optional output parameter into which the return code is to be copied from GPR 15.

To code: Specify the RS-type address of a fullword field, or register (2)-(12).

,RSNCODE=rsncode

An optional output parameter into which the reason code is to be copied from GPR 0.

To code: Specify the RS-type address of a fullword field, or register (2)-(12).

,PLISTVER=IMPLIED_VERSION

,PLISTVER=MAX

,PLISTVER=1

An optional input parameter that specifies the version of the macro. PLISTVER determines which parameter list the system generates. PLISTVER is an optional input parameter on all forms of the macro, including the list form. When using PLISTVER, specify it on all macro forms used for a request and with the same value on all of the macro forms. The values are:

• IMPLIED_VERSION, which is the lowest version that allows all parameters specified on the request to be processed. If you omit the PLISTVER parameter, IMPLIED_VERSION is the default.
• MAX, if you want the parameter list to be the largest size currently possible. This size might grow from release to release and affect the amount of storage that your program needs.

  If you can tolerate the size change, IBM® recommends that you always specify PLISTVER=MAX on the list form of the macro. Specifying MAX ensures that the list-form parameter list is always long enough to hold all the parameters you might specify on the execute form, when both are assembled with the same level of the system. In this way, MAX ensures that the parameter list does not overwrite nearby storage.

• 1, if you use the currently available parameters.

To code: Specify one of the following:

• IMPLIED_VERSION
• MAX
• A decimal value of 1

,MF=S

,MF=(L,mfctrl)

,MF=(L,mfctrl,mfattr)

,MF=(L,mfctdrl,0D)

,MF=(E,mfctrl)

,MF=(E,mfctrl,COMPLETE)

An optional input parameter that specifies the macro form.

Use MF=S to specify the standard form of the macro, which builds an inline parameter list and generates the macro invocation to transfer control to the service. MF=S is the default.

Use MF=L to specify the list form of the macro. The list form defines an area of storage that the execute form uses to store the parameters. Only the PLISTVER parameter may be coded with the list form of the macro.

Use MF=E to specify the execute form of the macro. The execute form of the macro stores the parameters into the storage area defined by mfctrl and provides full syntax checking with the default setting.

,mfctrl

This is a required keyword that specifies a storage area for the parameter list. This can be an RS-type address or an address in register (1)-(12).

,mfattr

An optional 1- to 60-character input string that you use to force boundary alignment of the parameter list. Use a value of 0F to force the parameter list to a word boundary, or 0D to force the parameter list to a doubleword boundary. If you do not code mfattr, the system provides a value of 0D.

,COMPLETE

Specifies that the system is to check for required parameters and supply defaults for omitted optional parameters.

None.

The following table identifies the hexadecimal return and reason codes:

The following table identifies the hexadecimal return and reason codes: