page_size man page on Tru64

page_size man page on Tru64

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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 transfers
       so  that	 they never cross a virtual page boundary. You should use this
       global variable only when: A subsystem cannot use the DMA mapping  rou‐
       tines  (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)

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