VMS Help System Services, $CRMPSC PFN 64 (Alpha Only)  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    On Alpha 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.

    Format

      SYS$CRMPSC_PFN_64  region_id_64 ,start_pfn ,page_count ,acmode

                         ,flags ,return_va_64 ,return_length_64

                         [,start_va_64]

    C Prototype

      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,...);

1 - Arguments

 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)
    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)
    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$M_EXPREG  Pages are mapped into the first available space at
                  the current end of the specified region.
    SEC$M_NO_     Pages cannot overmap existing address space. By
    OVERMAP       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_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 Compaq 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.