osf1 man page for round_page

round_page(9r)															    round_page(9r)

NAME
       round_page - General: Rounds the specified address

SYNOPSIS
       #include <mach/vm_param.h>

       vm_offset_t round_page(
	       vm_offset_t address );

ARGUMENTS
       Specifies the address (or byte count) that is being rounded.

DESCRIPTION
       The  round_page	routine rounds the specified address (or byte count) to a multiple of the page size. For example, round_page would round a
       1-byte count to be equal to the size of one page.  This routine shields the driver writer from having to know the page size of the  system,
       which  could  vary in different CPU architectures and on different CPU types within the same architecture. Typically, a device driver calls
       round_page in preparation for doing a DMA operation to a user's buffer. The value returned by this routine is  used  in	the  call  to  the
       vm_map_pageable routine. To use this routine, the driver writer must include the <mach/vm_param.h> header file in the driver.

RETURN VALUES
       The round_page routine returns the rounded address or byte count.

SEE ALSO
       Routines: current_task(9r), trunc_page(9r), vm_map_pageable(9r)

																    round_page(9r)