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Annotation of coherent/f/usr/man/KERNEL/dmareq, revision 1.1

1.1     ! root        1: ddmmaarreeqq() -- Accessible Kernel Routine
        !             2: 
        !             3: #iinncclluuddee <ssyyss/bbuuff.hh>
        !             4: vvooiidd
        !             5: ddmmaarreeqq(_b_p, _i_o_p, _d_e_v, _r_e_q)
        !             6: BBUUFF *_b_p;
        !             7: IIOO *_i_o_p;
        !             8: ddeevv_tt _d_e_v;
        !             9: iinntt _r_e_q;
        !            10: 
        !            11: ddmmaarreeqq(), like iioorreeqq(), queues an  I/O request through the block routine of
        !            12: a device driver.   _b_p points to the BBUUFF structure  for the I/O.  _i_o_p points
        !            13: to an  IIOO structure.  _d_e_v is  the device to access.   Finally, _r_e_q requests
        !            14: the type of I/O: it must be either BBRREEAADD or BBWWRRIITTEE.
        !            15: 
        !            16: ddmmaarreeqq() converts  I/O requests  that straddle  DMA boundaries into  two or
        !            17: three non-straddling  requests.  It converts  block DMA straddles  into two
        !            18: non-straddling  I/O requests;  it converts other  DMA straddles  into three
        !            19: non-straddling  I/O requests,  where  the DMA-straddling  block is  handled
        !            20: through the  buffer cache.   Note that the  driver's block routine  must be
        !            21: able to function with the smaller I/O requests.
        !            22: 
        !            23: _S_e_e _A_l_s_o
        !            24: aacccceessssiibbllee kkeerrnneell rroouuttiinneess, iioorreeqq()

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