bp_mapin(9f) [opensolaris man page]

bp_mapin(9F)						   Kernel Functions for Drivers 					      bp_mapin(9F)

NAME

       bp_mapin - allocate virtual address space

SYNOPSIS

       #include <sys/types.h>
       #include <sys/buf.h>

       void bp_mapin(struct buf *bp);

INTERFACE LEVEL

       Architecture independent level 1 (DDI/DKI).

PARAMETERS

       bp     Pointer to the buffer header structure.

DESCRIPTION

       bp_mapin()  is  used  to  map  virtual address space to a page list maintained by the buffer header during a paged- I/O request. bp_mapin()
       allocates system virtual address space, maps that space to  the	page  list,  and  returns  the	starting  address  of  the  space  in  the
       bp->b_un.b_addr field of the buf(9S) structure. Virtual address space is then deallocated using the bp_mapout(9F) function.

       If a null page list is encountered, bp_mapin() returns without allocating space and no mapping is performed.

CONTEXT

       bp_mapin() can be called from user and kernel contexts.

SEE ALSO

       bp_mapout(9F), buf(9S)

       Writing Device Drivers

SunOS 5.11							    13 Sep 1992 						      bp_mapin(9F)

bp_copyout(9F)						   Kernel Functions for Drivers 					    bp_copyout(9F)

NAME

       bp_copyout - copy from a driver buffer into a buf(9S)

SYNOPSIS

       #include <sys/types.h>
       #include <sys/buf.h>

       int bp_copyout(void *driverbuf, struct buf *bp, offset_t offset,
	    size_t size);

INTERFACE LEVEL

       Architecture independent level 1 (DDI/DKI).

PARAMETERS

       bp	    Pointer to the buffer header structure to copy to.

       driverbuf    Driver buffer to copy from.

       offset	    Offset into bp where to start copying.

       size	    Size of copy.

DESCRIPTION

       The  bp_copyout()  function copies size bytes starting from the driver buffer driverbuf to offset bytes into the memory associated with bp.
       The offset only applies to bp.

RETURN VALUES

       Under normal conditions, 0 is returned to indicate a successful copy. Otherwise, -1 is returned if bp references invalid pages.

CONTEXT

       The bp_copyout() function can be called from user or kernel context only.

SEE ALSO

       bp_copyin(9F), bp_mapin(9F), bp_mapout(9F), ddi_copyout(9F), buf(9S)

SunOS 5.11							    16 Oct 2007 						    bp_copyout(9F)