osf1 man page for page_size

page_size(9v)															     page_size(9v)

NAME
       page_size - Global Variable: Is the virtual page size

SYNOPSIS
       extern vm_size_t page_size;

DESCRIPTION
       The page_size global variable  is the size of a virtual page on a CPU. A device driver can use this global variable to partition I/O trans-
       fers so that they never cross a virtual page boundary. You should use this global variable only when: A subsystem cannot use the  DMA  map-
       ping  routines  (such as, dma_map_alloc, dma_map_load, and so forth) There is a one-to-one correspondence between the system memory map and
       the I/O's view of the system memory space

FILES
																     page_size(9v)