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Expansion occurs at the current end of that region's virtual address space.
The pagcnt argument is a longword value containing this number. On Alpha systems, the specified value is rounded up to an even multiple of the CPU-specific page size. The retadr argument is the address of a 2-longword array containing, in order, the starting and ending process virtual addresses. The acmode argument is a longword containing the access mode. The region argument is a longword value.