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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)

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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)

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