REQUEST=UNPROTECT requests that data within one or more memory objects be made modifiable.
The IARV64 REQUEST=UNPROTECT unprotects pages/segments within 64-Bit Private or 64-Bit Common memory objects. 64-bit fixed 2 GB private memory objects cannot be protected.
The requirements for the caller are:
| Environmental factor | Requirement |
|---|---|
| Minimum authorization: | Problem state and PSW key 8-15. The caller must have a PSW key of 0 or a PSW key that matches the storage to be unprotected. The caller must be running in supervisor state or with PSW key 0-7 to use the ALETVALUE keyword. |
| Dispatchable unit mode: | Task or SRB |
| Cross memory mode: | Any PASN, any HASN, any SASN |
| AMODE: | 31- or 64-bit |
| ASC mode: | Primary or access register (AR) |
| Interrupt status: | Enabled for I/O and external interrupts for 64-bit private. Enabled or disabled for I/O and external interrupts for 64-bit common storage. |
| Locks: | You may hold the local lock for the target address space. If you hold the local lock, you may also hold the CMS lock. For disabled callers no spin locks higher than the RSM locks can be held. |
| Control parameters: | Control parameters must be in the primary address space and can reside both below and above the bar. |
None
This macro supports multiple versions. Some keywords are unique to certain versions. See PLISTVER parameter description.
Before issuing the IARV64 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 REQUEST=UNPROTECT option of the IARV64 macro is written as follows:
| Syntax | Description |
|---|---|
| name | name: symbol. Begin name in column 1. |
| ␢ | One or more blanks must precede IARV64. |
| IARV64 | |
| ␢ | One or more blanks must follow IARV64. |
| REQUEST=UNPROTECT | |
| ,RANGLIST=ranglist | ranglist: RS-type address or address in register (2) - (12). |
| ,ALETVALUE=aletvalue | aletvalue: RS-type address or address in register (2) - (12). |
| ,ALETVALUE=0 | Default: ALETVALUE=0 |
| ,NUMRANGE=numrange | numrange: RS-type address or address in register (2) - (12). |
| ,NUMRANGE=1 | Default: NUMRANGE=1 |
| ,AMOUNTSIZE=1MEG | Default: AMOUNTSIZE=4K. AMOUNTSIZE=1MEG is the default when the data to be acted on is from a fixed 1 MB-page frames request. AMOUNTSIZE cannot be specified when the data to be acted on is from a fixed 2 GB-page frames request. |
| ,AMOUNTSIZE=4K | |
| ,RETCODE=retcode | retcode: RS-type address or register (2) - (12). |
| ,RSNCODE=rsncode | rsncode: RS-type address or register (2) - (12). |
| ,PLISTVER=IMPLIED_VERSION | Default: PLISTVER=IMPLIED_VERSION |
| ,PLISTVER=MAX | |
| ,PLISTVER=0, 1, 2, 3, 4, 5 | |
| ,MF=S | Default: MF=S |
| ,MF=(L, list addr) | list addr: RS-type address or register (1) - (12). |
| ,MF=(L, list addr, attr) | |
| ,MF=(L, list addr, 0D) | |
| ,MF=(E, list addr) | |
| ,MF=(E, list addr, COMPLETE) | |
| ,MF=(M, list addr) | |
| ,MF=(M ,list addr, COMPLETE) | |
| ,MF=(M, list addr, NOCHECK) | |
The parameters are explained as follows:
Areas of the memory object that are in guard areas or hidden will not be affected.
The address specified must be within a created memory object returned by GETSTOR or GETCOMMON.
The length of this field is 8 bytes.
The number of 4K, 1M, or 2G pages specified starting with the specified VSA must lie within a single memory object.
The length of this field is 8 bytes.
The amount contains the number of 1M pages to be acted on when the specified VSA is backed by fixed large page frames (1M).
The amount contains the number of 2G pages to be acted on when the specified VSA is backed by fixed 2G page frames (2G).
When the data to be acted on is from a fixed 1M page frames request (TYPE=FIXED and PAGEFRAMESIZE=1M is specified, or TYPE is not specified and PAGEFRAMESIZE=1MEG is specified, or PAGEFRAMESIZE=MAX is specified and the address specified is backed by fixed 1M page frames), the default is AMOUNTSIZE=1MEG. Only AMOUNTSIZE=1MEG can be specified.
When the data to be acted on is from a fixed 2G page frames request (TYPE=FIXED and PAGEFRAMESIZE=2G is specified), AMOUNTSIZE cannot be specified. The AMOUNT value specified on the RANGLIST parameter is treated as the number of 2G pages to be acted on.
The only supported values are 0 (primary) and 2 (home). The ALETVALUE parameter can be used only by callers running in supervisor state or with PSW key 0-7. The default is 0.
To code: Specify the RS-type address, or address in register (2)-(12), of a fullword field.
The value specified must be no greater than 16. The default is 1.
To code: Specify the RS-type address of a fullword field, or register (2)-(12).
To code: Specify the RS-type address of a fullword field, or register (2)-(12).
If you can tolerate the size change, you can 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.
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. Use the list form together with the execute form of the macro for applications that require reentrant code. 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. Use the execute form together with the list form of the macro for applications that require reentrant code. The execute form of the macro stores the parameters into the storage area defined by the list form, and generates the macro invocation to transfer control to the service.
Use MF=M together with the list and execute forms of the macro for service routines that need to provide different options according to user-provided input. Use the list form to define a storage area; use the modify form to set the appropriate options; then use the execute form to call the service.