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/ IRIX Base Documentation 2001 May / SGI IRIX Base Documentation 2001 May.iso / usr / share / catman / p_man / catD / hwcpin.z / hwcpin
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Text File  |  1998-10-30  |  2.5 KB  |  67 lines
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  4. hhhhwwwwccccppppiiiinnnn((((DDDD3333XXXX))))                                                        hhhhwwwwccccppppiiiinnnn((((DDDD3333XXXX))))
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  8. NNNNAAAAMMMMEEEE
  9.      _hhhh_wwww_cccc_pppp_iiii_nnnn - copy data from I/O devices using 16-bit reads
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  11. SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
  12.      _####_iiii_nnnn_cccc_llll_uuuu_dddd_eeee _""""_ssss_yyyy_ssss_////_tttt_yyyy_pppp_eeee_ssss_...._hhhh_""""
  13.      _####_iiii_nnnn_cccc_llll_uuuu_dddd_eeee _<<<<_ssss_yyyy_ssss_////_ssss_yyyy_ssss_tttt_mmmm_...._hhhh_>>>>
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  15.      _hhhh_wwww_cccc_pppp_iiii_nnnn_((((_vvvv_oooo_llll_aaaa_tttt_iiii_llll_eeee _uuuu_nnnn_ssss_iiii_gggg_nnnn_eeee_dddd _ssss_hhhh_oooo_rrrr_tttt _****_f_r_o_m_,,,, _cccc_aaaa_dddd_dddd_rrrr______tttt _t_o_,,,, _iiii_nnnn_tttt _n_u_m__b_y_t_e_s_))))_;;;;
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  17. DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
  18.      _hhhh_wwww_cccc_pppp_iiii_nnnn efficiently copies data from device memory to main memory using
  19.      16-bit reads only.
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  21.      _hhhh_wwww_cccc_pppp_iiii_nnnn is similar to _bbbb_cccc_oooo_pppp_yyyy(D3) in that it does not verify the
  22.      accessibility of the memory before attempting the transfer.  However,
  23.      _bbbb_cccc_oooo_pppp_yyyy attempts to optimize for speed, and can generate 32-bit and 64-bit
  24.      reads.
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  26.      When the device is mapped using a PIO map created with _pppp_iiii_oooo______mmmm_aaaa_pppp_aaaa_llll_llll_oooo_cccc(D3X),
  27.      use _pppp_iiii_oooo______bbbb_cccc_oooo_pppp_yyyy_iiii_nnnn(D3X), which allows you to specify the transfer unit size.
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  29.    RRRReeeettttuuuurrrrnnnn VVVVaaaalllluuuueeeessss
  30.      None
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  32.    SSSSeeeeeeee AAAAllllssssoooo
  33.      bcopy(D3), hwcpout(D3X), pio_bcopyin(D3X).
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  63.                                                                         PPPPaaaaggggeeee 1111
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