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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.
| OpenVMS usage: | mask_longword |
| type: | longword (unsigned) |
| access: | read only |
| mechanism: | by value |
The following table describes each flag that is valid for $CRMPSC_GPFN_64:
| Flag | Description |
|---|---|
| SEC$M_ARGS64 | Indicates that all parameters, specifically start_pfn and page_count, are passed as 64-bit numbers. This flag is ignored on OpenVMS Alpha but must be set on Integrity server systems. If the flag is not set on Integrity servers, the error code SS$_IVSECFLG is returned. |
| SEC$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_UNCACHED | Flag that must be set when a PFN-mapped section is created if this section must be treated as uncached memory. Flag is ignored on Alpha systems; it applies only to Integrity server systems. |
| SEC$M_WRT | Pages form a read/write section. By default, pages form a read-only section. |
All other bits in the flags argument are reserved for future use by HP and should be specified as 0. The condition value SS$_IVSECFLG is returned if any undefined bits are set or if an illegal combination of flags is set.
| 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: | CPU-specific page count |
| type: | longword (unsigned) |
| access: | read only |
| mechanism: | by value |
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.All global page frame sections are permanent. Pages mapped to a global page frame section are not included in or charged against the process's working set; they are always valid. Do not lock these pages in the working set by using $LKWSET; this can result in a machine check if they are in I/O space.
If the condition value SS$_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$_ACCVIO is returned, the returned address and returned length indicate the pages that were successfully mapped before the error occurred. If no pages were mapped, the return_va_64 argument will contain the value --1, and a value cannot be returned in the memory location pointed to by the return_length_64 argument.
To create a global page frame section, the process must have the following privileges:
- SYSGBL privilege to create a system global section (if flag SEC$M_SYSGBL is set)
- PRMGBL privilege to create a permanent global section (if flag SEC$M_PERM is set)
- PFNMAP privilege to create a page frame section
The working set quota (WSQUOTA) of the process must be sufficient to accommodate the increased length of the process page table required by the increase in virtual address space.
$CREATE_GPFN, $CREATE_REGION_64, $CRMPSC, $CRMPSC_FILE_64, $CRMPSC_GFILE_64, $CRMPSC_GPFILE_64, $CRMPSC_PFN_64, $DELETE_REGION_64, $DELTVA_64, $DGBLSC, $MGBLSC_GPFN_64
SS$_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$_EXBYTLM The process has exceeded the byte count quota. SS$_GBLSEC_MISMATCH Global section type mismatch. The specified global section was found; however, it was not a global disk 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$_ILLRELPAG The specified relative page argument is either larger than the highest page number within the section or is not a valid 32-bit physical page frame number. SS$_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$_NOPFNMAP The process does not have the privilege to create or delete a section starting at a specific physical page frame number (PFNMAP). SS$_NOPRMGBL The process does not have the privileges to create or delete a permanent group global section (PRMGBL). SS$_NOSHPTS A virtual address within a shared page-table region was specified, or the region ID of a shared page-table region was specified. SS$_NOSYSGBL The process does not have the privileges to create or delete a system global section (SYSGBL). SS$_NOWRTACC The specified global section is not copy-on-reference and does not allow write access. SS$_PAGNOTINREG A page in the specified range is not within the specified region. SS$_REGISFULL The specified virtual region is full; no space is available in the region for the pages created to contain the mapped section. SS$_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, or the existing underlying page cannot be deleted because it is associated with a buffer object. SS$_VA_NOTPAGALGN The start_va_64 argument is not CPU-specific page-aligned.
On Alpha and Integrity server systems, allows a process to map a section of its address space to a specified physical address range represented by page frame numbers. This service creates and maps a private page frame section.This service accepts 64-bit addresses.
SYS$CRMPSC_PFN_64 region_id_64 ,start_pfn ,page_count ,acmode ,flags ,return_va_64 ,return_length_64 [,start_va_64]
int sys$crmpsc_pfn_64 (struct _generic_64 *region_id_64, unsigned int start_pfn, unsigned int page_count, unsigned int acmode, unsigned int flags, void *(*(return_va_64)), unsigned __int64 *return_length_64,...);
region_id_64
OpenVMS usage: region identifier type: quadword (unsigned) access: read only mechanism: by 32- or 64-bit reference
The region ID associated with the region to map the private page frame section. The file VADEF.H in SYS$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.
start_pfn
OpenVMS usage: page frame number type: longword (unsigned)on Alpha, quadword (unsigned) on Integrity servers access: read only mechanism: by value
The CPU-specific page frame number where the section begins in memory.
page_count
OpenVMS usage: CPU-specific page count type: longword (unsigned) on Alpha, quadword (unsigned) on Integrity servers access: read only mechanism: by value
Length of the page frame section in CPU-specific pages.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. 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.
flags
OpenVMS usage: mask_longword type: longword (unsigned) access: read only mechanism: by value
Flag mask specifying the characteristics of the private 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 the $CRMPSC_PFN_64 service:
Flag Description SEC$M_ARGS64 Indicates that all parameters, specifically start_pfn and page_count, are passed as 64-bit numbers. This flag is ignored on OpenVMS Alpha but must be set on Integrity server systems. If the flag is not set on Integrity servers, the error code SS$_IVSECFLG is returned. SEC$M_EXPREG Pages are mapped into the first available space at the current end of the specified region. SEC$M_NO_OVERMAP Pages cannot overmap existing address space. By default, pages can overmap existing address space. SEC$M_PFNMAP Pages form a page frame section. By default, this flag is always present in this service and cannot be disabled. SEC$M_UNCACHED Flag that must be set when a PFN-mapped section is created if this section must be treated as uncached memory. Flag is ignored on Alpha systems; it applies only to Integrity server systems. SEC$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 HP and should be specified as 0. The condition value SS$_IVSECFLG is returned if any undefined bits are set or if an invalid combination of flags is set.
return_va_64
OpenVMS usage: address type: quadword address access: write only mechanism: by 32- or 64-bit reference
The lowest process virtual address into which the private page frame section was mapped. The return_va_64 argument is the 32- or 64-bit virtual address of a naturally aligned quadword into which the service returns the virtual address.return_length_64
OpenVMS usage: byte count type: quadword (unsigned) access: write only mechanism: by 32- or 64-bit reference
The length of the virtual address range mapped. The return_length_64 argument is the 32- or 64-bit virtual address of a naturally aligned quadword into which the service returns the length of the virtual address range in bytes.start_va_64
OpenVMS usage: address type: quadword address access: read only mechanism: by value
The starting virtual address to map the private page frame section. The specified virtual address must be a CPU-specific page aligned address. If the flag SEC$M_EXPREG is specified, the start_va_64 argument must not be specified or must be specified as 0. If SEC$M_EXPREG is set and the start_va_64 argument is nonzero, the condition value SS$_IVESCFLG is returned.
The Create and Map Private Page Frame Section service allows a process to create a map to a private page frame section. Creating a private page frame section involves defining certain physical page numbers (PFNs) as a section. 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.All global page frame sections are permanent. Pages mapped by SEC$M_PFNMAP are not included in or charged against the process's working set; they are always valid. Do not lock these pages in the working set by using $LKWSET_64; this can result in a machine check if they are in I/O space.
If the condition value SS$_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.
PFNMAP privilege is required to create a page frame section.
The working set quota (WSQUOTA) of the process must be sufficient to accommodate the increased length of the process page table required by the increase in virtual address space.
$CREATE_REGION_64, $CRMPSC, $CRMPSC_FILE_64, $CRMPSC_GFILE_64, $CRMPSC_GPFILE_64, $CRMPSC_GPFN_64, $DELETE_REGION_64, $DELTVA_64
SS$_NORMAL The service completed successfully. SS$_ACCVIO The return_va_64 argument or the return_length_64 argument cannot be written by the caller. SS$_INSFWSL The process's working set limit is not large enough to accommodate the increased virtual address space. SS$_IVACMODE The caller's mode is less privileged than the create mode associated with the region. SS$_IVREGID Invalid region ID specified. SS$_IVSECFLG An invalid flag, a reserved flag, or an invalid combination of flags and arguments was specified. SS$_NOPFNMAP The process does not have the privilege to create a section starting at a specific physical page frame number (PFNMAP). SS$_NOSHPTS The region ID of a shared page table region was specified. SS$_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$_VA_IN_USE A page in the specified input address range is already mapped and the flag SEC$M_NO_OVERMAP is set, or the existing underlying page cannot be deleted because it is associated with a buffer object. SS$_VA_NOTPAGALGN The start_va_64 argument is not CPU-specific page aligned.
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