bp_mapout(9F) Kernel Functions for Drivers bp_mapout(9F)
NAME
bp_mapout - deallocate virtual address space
SYNOPSIS
#include <sys/types.h>
#include <sys/buf.h>
void bp_mapout(struct buf *bp);
INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI).
PARAMETERS
bp Pointer to the buffer header structure.
DESCRIPTION
bp_mapout() deallocates system virtual address space allocated by a previous call to bp_mapin(9F).bp_mapout() should only be called on
buffers which have been allocated and are owned by the device driver. It must not be called on buffers passed to the driver through the
strategy(9E) entry point (for example a filesystem). Because bp_mapin(9F) does not keep a reference count, bp_mapout() will wipe out any
kernel mapping that a layer above the device driver might rely on.
CONTEXT
bp_mapout() can be called from user context only.
SEE ALSO
strategy(9E), bp_mapin(9F), buf(9S)
Writing Device Drivers
SunOS 5.11 15 Nov 1996 bp_mapout(9F)
