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trunc_page(9r)							trunc_page(9r)

NAME
       trunc_page - General: Truncates the specified address

SYNOPSIS
       #include <mach/vm_param.h>

       vm_offset_t trunc_page(
	       vm_offset_t address );

ARGUMENTS
       Specifies the address that is being truncated to a page boundary.

DESCRIPTION
       The trunc_page routine truncates the specified address to be aligned on
       a page boundary. 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 trunc_page in preparation for doing a
       DMA operation on 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 trunc_page routine returns an address truncated to a page boundary.

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

								trunc_page(9r)

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