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| OpenVMS usage: | region identifier |
| type: | quadword (unsigned) |
| access: | read only |
| mechanism: | by 32- or 64-bit reference |
The file VADEF.H in SYS$STARLET_C.TLB and the $VADEF macro in STARLET.MLB define a symbolic name for each of the three default regions in P0, P1, and P2 space. The following region IDs are defined:
| Symbol | Region |
|---|---|
| VA$C_P0 | Program region |
| VA$C_P1 | Control region |
| VA$C_P2 | 64-bit program region |
Other region IDs, as returned by the $CREATE_REGION_64 service, can be specified.
| OpenVMS usage: | byte offset |
| type: | quadword (unsigned) |
| access: | read only |
| mechanism: | by value |
| OpenVMS usage: | access_mode |
| type: | longword (unsigned) |
| access: | read only |
| mechanism: | by value |
The $PSLDEF macro in STARLET.MLB and the file PSLDEF.H in SYS$STARLET_C.TLB define the following symbols and their values for the four access modes:
| Value | Symbolic Name | Access Mode |
|---|---|---|
| 0 | PSL$C_KERNEL | Kernel |
| 1 | PSL$C_EXEC | Executive |
| 2 | PSL$C_SUPER | Supervisor |
| 3 | PSL$C_USER | User |
The most privileged access mode used is the access mode of the caller. The calling process can delete pages only if those pages are owned by an access mode equal to or less privileged than the access mode of the calling process.
Address space cannot be created within a region that has a create mode associated with it that is more privileged than the caller's mode. The condition value SS$_IVACMODE is returned if the caller is less privileged than the create mode for the region.
| OpenVMS usage: | mask_longword |
| type: | longword (unsigned) |
| access: | read only |
| mechanism: | by value |
The following table describes each flag that is valid for the $CRMPSC_GPFILE_64 service:
| Flag | Description |
|---|---|
| SEC$M_DZRO | Pages are demand-zero pages. By default, this flag is always present in this service and cannot be disabled. |
| SEC$M_EXPREG | Pages are mapped into the first available space at the current end of the specified region. SEC$M_EXPREG cannot be specified with the SEC$M_NO_OVERMAP flag. |
| SEC$M_GBL | Pages form a global section. By default, this flag is always present in this service and cannot be disabled. |
| SEC$M_NO_OVERMAP | Pages cannot overmap existing address space. By default, pages can overmap existing address space. SEC$M_NO_OVERMAP cannot be specified with the SEC$M_EXPREG flag. |
| SEC$M_PAGFIL | Pages form a global page file section. By default, this flag is always present in this service and cannot be disabled. |
| SEC$M_PERM | Global section is permanent. By default, global sections are temporary. |
| SEC$M_SYSGBL | Pages form a system global section. By default, pages form a group global section. |
| SEC$M_WRT | Pages form a read/write section. By default, this flag is always present in this service and cannot be disabled. |
All other bits in the flags argument are reserved for future use by Digital and should be specified as 0. The condition value SS$_IVSECFLG is returned if any undefined bits are set or if an invalid combination of flags is set.
| OpenVMS usage: | address |
| type: | quadword address |
| access: | write only |
| mechanism: | by 32- or 64-bit reference |
| OpenVMS usage: | byte count |
| type: | quadword (unsigned) |
| access: | write only |
| mechanism: | by 32- or 64-bit reference |
| OpenVMS usage: | address |
| type: | quadword address |
| access: | read only |
| mechanism: | by value |
Always refer to the return_va_64 and return_length_64 arguments to determine the range of virtual addresses mapped.
| OpenVMS usage: | byte count |
| type: | quadword (unsigned) |
| access: | read only |
| mechanism: | by value |
The Create and Map Global Page File Section service allows a process to create a map to global page file section. Creating a global page file section involves defining a global section backed up by the system page file. The section is mapped from a low address to a high address whether the section is mapped in a region that grows from low to high addresses or from high to low addresses. If the $CRMPSC_GPFILE_64 service specifies a global section that already exists, the service maps it.If the condition value SS$_ACCVIO is returned by this service, a value cannot be returned in the memory locations pointed to by the return_va_64 and return_length_64 arguments.
If a condition value other than SS$_ACCVIO is returned, the returned address and returned length indicate the pages that were successfully mapped before the error occurred. If no pages were mapped, the return_va_64 argument will contain the value --1, and a value cannot be returned in the memory location pointed to by the return_length_64 argument.
Required Privileges
In order to create a global section, the process must have the following privileges:
- SYSGBL privilege to create a system global section (if flag SEC$M_SYSGBL is set)
- PRMGBL privilege to create a permanent global section
Required Quota
Because the section pages are copy-on-reference, the process must have sufficient paging file quota (PGFLQUOTA).
The working set limit quota (WSQUOTA) of the process must be sufficient to accommodate the increased size of the process page table required by the increase in virtual address space when the section is mapped.
Related Services
$CREATE_GPFILE, $CREATE_REGION_64, $CRMPSC, $CRMPSC_FILE_64, $CRMPSC_GFILE_64, $CRMPSC_GPFN_64, $CRMPSC_PFN_64, $DELETE_REGION_64, $DELTVA_64, $DGBLSC, $LCKPAG_64, $LKWSET_64, $MGBLSC_64, $PURGE_WS, $SETPRT_64, $ULKPAG_64, $ULWSET_64, $UPDSEC_64, $UPDSEC_64W
SS$_NORMAL The service completed successfully. The specified global section already exists and has been mapped. SS$_CREATED The service completed successfully. The specified global section did not previously exist and has been created. SS$_ACCVIO The gs_name_64 argument cannot be read by the caller, or the return_va_64 or return_length_64 argument cannot be written by the caller. SS$_EXBYTLM The process has exceeded the byte count quota. SS$_EXGBLPAGFIL The process has exceeded the systemwide limit on global page file pages; no part of the section was mapped. SS$_EXPGFLQUOTA The process exceeded its paging file quota, creating copy-on-reference pages. SS$_GBLSEC_MISMATCH Global section type mismatch. The specified global section was found; however, it is not a global disk or page file section. SS$_GPTFULL There is no more room in the system global page table to set up page table entries for the section. SS$_GSDFULL There is no more room in the system space allocated to maintain control information for global sections. SS$_INSFWSL The process's working set limit is not large enough to accommodate the increased virtual address space. SS$_IVACMODE The caller's mode is less privileged than the create mode associated with the region. SS$_IVLOGNAM The specified global section name has a length of 0 or has more than 43 characters. SS$_IVREGID Invalid region ID specified. SS$_IVSECFLG An invalid flag, a reserved flag, or an invalid combination of flags and arguments was specified. SS$_IVSECIDCTL The match control field of the global section identification is invalid. SS$_LEN_NOTPAGMULT The length_64 argument is not a multiple of CPU-specified pages or was specified as 0. SS$_NOPRMGBL The process does not have the privileges to create or delete a permanent group global section (PRMGBL). SS$_NOSHPTS The region ID of a shared page table region was specified. SS$_NOSYSGBL The process does not have the privileges to create or delete a system global section (SYSGBL). SS$_NOWRTACC The specified global section is not copy-on-reference and does not allow write access. SS$_OFF_NOTPAGALGN The section_offset_64 argument is not CPU-specific page aligned if a map to a global page file section was requested (SEC$M_PAGFIL is set in the flags argument). SS$_OFFSET_TOO_BIG The section_offset_64 argument specified is beyond the logical end-of-file. SS$_PAGNOTINREG A page in the specified range is not within the specified region. SS$_PAGOWNVIO A page in the specified input address range is owned by a more privileged access mode. SS$_REGISFULL The specified virtual region is full; no space is available in the region for the pages created to contain the mapped section. SS$_SECTBLFUL There are no entries available in the system global section table. SS$_TOOMANYLNAM The logical name translation of the gs_name_64 argument exceeded the allowed depth of 10. SS$_VA_IN_USE A page in the specified input address range is already mapped, and the flag SEC$M_NO_OVERMAP is set. SS$_VA_NOTPAGALGN The start_va_64 argument is not CPU-specific page aligned.
On Alpha systems, allows a process to create a permanent global page frame section and to map a section of its address space to the global page frame section.This service accepts 64-bit addresses.
SYS$CRMPSC_GPFN_64 gs_name_64 ,ident_64 ,prot ,start_pfn ,page_count ,region_id_64 ,relative_page ,acmode ,flags ,return_va_64 ,return_length_64 [,start_va_64 [,map_page_count]]
int sys$crmpsc_gpfn_64 (void *gs_nam_64, struct _secid *ident_64, unsigned int prot, unsigned int start_pfn, unsigned int page_count, struct _generic_64 *region_id_64, unsigned int relative_page, unsigned int acmode, unsigned int flags, void *(*(return_va_64)), unsigned __int64 *return_length_64,...);
gs_name_64
OpenVMS usage: section_name type: character-coded text string access: read only mechanism: by 32- or 64-bit descriptor--fixed-length string descriptor
Name of the global section. The gs_name_64 argument is the 32- or 64-bit virtual address of a naturally aligned 32- or 64-bit string descriptor pointing to this name string.ident_64
OpenVMS usage: section_id type: quadword (unsigned) access: read only mechanism: by 32- or 64-bit reference
Identification value specifying the version number of a global section. The ident_64 argument is a quadword containing three fields. The ident_64 argument is the 32- or 64-bit virtual address of a naturally aligned quadword that contains the identification value.The first longword specifies the matching criteria in its low-order 2 bits. The valid values, symbolic names by which they can be specified, and their meanings are as follows:
Value Symbolic Name Match Criteria 0 SEC$K_MATALL Match all versions of the section. 1 SEC$K_MATEQU Match only if major and minor identifications match. 2 SEC$K_MATLEQ Match if the major identifications are equal and the minor identification of the mapper is less than or equal to the minor identification of the global section. When a section is mapped at creation time, the match control field is ignored. If you specify the ident_64 argument as 0, the version number and match control fields default to 0.
The version number is in the second longword. The version number contains two fields: a minor identification in the low-order 24 bits and a major identification in the high-order 8 bits. You can assign values for these fields by installation convention to differentiate versions of global sections. If no version number is specified when a section is created, processes that specify a version number when mapping cannot access the global section.
prot
OpenVMS usage: file_protection type: longword (unsigned) access: read only mechanism: by value
Protection to be applied to the global page file section.The mask contains four 4-bit fields. Bits are read from right to left in each field. The following diagram depicts the mask:
Cleared bits indicate that read, write, execute, and delete access, in that order, are granted to the particular category of user. Only read, write, and execute access are meaningful for section protection. Delete access bits are ignored. Read access also grants execute access for those situations where execute access applies. If zero is specified, read access and write access are granted to all users.
start_pfn
OpenVMS usage: page frame number type: longword (unsigned) access: read only mechanism: by value
The CPU-specific page frame number where the section begins.page_count
OpenVMS usage: CPU-specific page count type: longword (unsigned) access: read only mechanism: by value
Length of the page frame section in CPU-specific pages.region_id_64
OpenVMS usage: region identifier type: quadword (unsigned) access: read only mechanism: by 32- or 64-bit reference
The region ID associated with the region to map the global page frame section. The file VADEF.H in SYS$STARLET_C.TLB and the $VADEF macro in STARLET.MLB define a symbolic name for each of the three default regions in P0, P1, and P2 space.The following region IDs are defined:
Symbol Region VA$C_P0 Program region VA$C_P1 Control region VA$C_P2 64-bit program region Other region IDs, as returned by the $CREATE_REGION_64 service, can be specified.
relative_page
OpenVMS usage: CPU-specific page number type: longword (unsigned) access: read only mechanism: by value
Relative CPU-specific page number within the global section to start mapping.acmode
OpenVMS usage: access_mode type: longword (unsigned) access: read only mechanism: by value
Access mode that is to be the owner of the pages created during the mapping. The acmode argument is a longword containing the access mode.The $PSLDEF macro in STARLET.MLB and the file PSLDEF.H in SYS$STARLET_C.TLB define the following symbols and their values for the four access modes:
Value Symbolic Name Access Mode 0 PSL$C_KERNEL Kernel 1 PSL$C_EXEC Executive 2 PSL$C_SUPER Supervisor 3 PSL$C_USER User The most privileged access mode used is the access mode of the caller.
Address space cannot be created within a region that has a create mode associated with it that is more privileged than the caller's mode. The condition value SS$_IVACMODE is returned if the caller is less privileged than the create mode for the region.
flags
OpenVMS usage: mask_longword type: longword (unsigned) access: read only mechanism: by value
Flag mask specifying the characteristics of the global section to be created. The flags argument is a longword bit vector in which each bit corresponds to a flag. The $SECDEF macro and the SECDEF.H file define a symbolic name for each flag. You construct the flags argument by performing a logical OR operation on the symbol names for all desired flags.The following table describes each flag that is valid for $CRMPSC_GPFN_64:
Flag Description SEC$M_EXPREG Pages are mapped into the first available space at the current end of the specified region. SEC$M_GBL Pages form a global section. By default, this flag is always present in this service and cannot be disabled. SEC$M_PERM Global section is permanent. By default, this flag is always present in this service and cannot be disabled. SEC$M_PFNMAP Pages form a page frame section. By default, this flag is always present in this service and cannot be disabled. SEC$M_NO_OVERMAP Pages cannot overmap existing address space. By default, pages can overmap existing address space. SEC$M_SYSGBL Pages form a system global section. By default, pages form a group global section. SEC$M_WRT Pages form a read/write section. By default, pages form a read-only section. All other bits in the flags argument are reserved for future use by Digital and should be specified as 0. The condition value SS$_IVSECFLG is returned if any undefined bits are set or if an illegal combination of flags is set.
return_va_64
OpenVMS usage: address type: quadword address access: write only mechanism: by 32- or 64-bit reference
The lowest process virtual address into which the global page frame section was mapped. The return_va_64 argument is the 32- or 64-bit address of a naturally aligned quadword into which the service returns the virtual address.return_length_64
OpenVMS usage: byte count type: quadword (unsigned) access: write only mechanism: by 32- or 64-bit reference
The 32- or 64-bit virtual address of a naturally aligned quadword into which the service returns the length of the virtual address range mapped in bytes.start_va_64
OpenVMS usage: address type: quadword address access: read only mechanism: by value
The starting virtual address to map the global page frame section. The specified virtual address must be a CPU-specific page-aligned address. If the flag SEC$M_EXPREG is specified, the start_va_64 argument must not be specified or must be specified as 0. If SEC$M_EXPREG is set and the start_va_64 argument is non-zero, the condition value SS$_IVSECFLG is returned.Always refer to the return_va_64 and return_length_64 arguments to determine the range of virtual addresses mapped.
map_page_count
OpenVMS usage: CPU-specific page count type: longword (unsigned) access: read only mechanism: by value
Length of the global page frame section to be mapped in CPU-specific pages.
The Create and Map Global Page Frame Section service allows a process to create and map to a global page frame section. Creating a global page frame section involves defining certain physical page frame numbers (PFNs) as a section.
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4527P021.HTM OSSG Documentation 22-NOV-1996 12:59:15.29Copyright © Digital Equipment Corporation 1996. All Rights Reserved.