Use REQUEST=PAGEUNFIX to unfix physical pages within one or more nonshared or common memory objects.
The requirements for the caller are:
Environmental factor | Requirement |
---|---|
Minimum authorization: | Can be used only by callers running in supervisor state or with PSW key 0-7. |
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 |
Locks: | A local lock may 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=PAGEUNFIX 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=PAGEUNFIX | |
,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 |
,COND=NO | Default: COND=NO |
,COND=YES | |
,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) |
|
The parameters are explained as follows:
PAGEUNFIX can only be requested for 64-bit private memory objects that are created using GETSTOR CONTROL=AUTH, and 64-bit common storage memory objects. PAGEUNFIX cannot be requested for 64-bit shared memory objects. 64-bit private or common storage memory objects backed by fixed 1 MB-page frames, or 64-bit private memory objects backed by fixed 2GB-page frames will be ignored.
A page is considered PAGEFIXed until the number of valid PAGEUNFIXes issued for the page is equal to the number of valid PAGEFIXes previously issued for that page.
If a PAGEUNFIX is issued for a page that is not PAGEFIXed, the caller will be abnormally ended.
The PAGEUNFIX keyword can be used only by callers running in supervisor state or with PSW key 0-7.
The address specified must be within a memory object returned by GETSTOR CONTROL=AUTH.
The value must always be on a physical 4 KB-page boundary.
The length of this field is 8 bytes.
The number of 4 KB-pages specified starting with the specified VSA must lie within a single memory object.
The length of this field is 8 bytes.
To code: Specify the RS-type address, or address in register (2)-(12), of an eight-byte pointer field.
The only supported values are 0 (primary) and 2 (home). ALETVALUE 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.
To code: Specify the RS-type address, or address in register (2)-(12), of a fullword field.
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, 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.
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.