개요

• 솔라나라에 설명된 어플리케이션에 대해 맨 페이지를 찾아 출력한다.
• MAN 페이지에 대한 설명은 윈디하나의 솔라나라: MAN 페이지을 참고하자.
• svcadm(8)을 검색하려면 섹션에서 8 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.

bp_mapin(9f)

bp_mapin(9F)                   Kernel Functions                   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
       The  bp_mapin()  function  makes  buffer data accessible to a driver by
       mapping the data into a contiguous kernel virtual address region. After
       bp_mapin(),  the  mapped  buffer  is accessible via the bp—>b_un.b_addr
       field of the buf(9S) structure.


       If bp_mapin() is unable to establish  a  mapping,  it  returns  without
       allocating space and no mapping is performed.


       Any  resources associated with establishing the mapping are deallocated
       by the bp_mapout(9F) function.

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

SEE ALSO
       bioaligned(9F), bp_mapout(9F), buf(9S)


       Writing Device Drivers in Oracle Solaris 11.4

WARNINGS
       Because bp_mapin() does not keep a reference  count,  bp_mapout()  will
       wipe  out any kernel mapping, including mappings that a layer above the
       device driver might still rely on. See bp_mapout(9F) for details.


       When a driver needs to look directly at buffer  data,  it  should  call
       bp_mapin()  without  conditioning  the  call  on  other  aspects of the
       buf(9S) structure like b_flags.


       To check alignment of buffer memory, it may be  more  efficient  for  a
       driver to use bioaligned(9F) instead of bp_mapin().



Oracle Solaris 11.4               21 Dec 2010                     bp_mapin(9F)