Manual Pages for UNIX Operating System command usage for man bp_mapin

Kernel Functions for Drivers                         bp_mapin(9F)



NAME
     bp_mapin - allocate virtual address space

SYNOPSIS
     #include 
     #include 



     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          Last change: 13 Sep 1992                    1