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<title>MPI On Cell (Documentation): src/spu/internal/dma/imoc_dma-get_spu.c Source File</title>
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<li><a href="../../annotated.html"><span>Data Structures</span></a></li>
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<h1>src/spu/internal/dma/imoc_dma-get_spu.c</h1><a href="../../d5/d1c/imoc__dma-get__spu_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="preprocessor">#include <spu_mfcio.h></span>
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<a name="l00002"></a>00002 <span class="preprocessor">#include <string.h></span>
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<a name="l00003"></a>00003
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<a name="l00004"></a>00004 <span class="preprocessor">#include <<a class="code" href="../../d0/d3a/spu_2moc_8h.html">moc.h</a>></span>
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<a name="l00005"></a>00005 <span class="preprocessor">#include <<a class="code" href="../../d2/d42/imoc__macros_8h.html">internal/imoc_macros.h</a>></span>
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<a name="l00006"></a>00006 <span class="preprocessor">#include <<a class="code" href="../../d4/dce/imoc__dma__spu_8h.html">internal/spu/imoc_dma_spu.h</a>></span>
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<a name="l00007"></a>00007
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<a name="l00008"></a><a class="code" href="../../d2/de2/group__internal__p2p__dma.html#g026790f4f64135c54c4e61c08925344c">00008</a> <span class="keywordtype">int</span> <a class="code" href="../../d2/de2/group__internal__p2p__dma.html#g53d36c567e4c98e5d258a7857096e7ab" title="Internal wrapper-function for a blocking DMA-get operation.">IMOC_get_data</a>(<span class="keywordtype">void</span>* target, uint64_t source, uint32_t size)
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<a name="l00009"></a>00009 {
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<a name="l00010"></a>00010 uint32_t remainder_16b;
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<a name="l00011"></a>00011 uint32_t remainder_16kb;
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<a name="l00012"></a>00012 uint32_t offset;
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<a name="l00013"></a>00013 uint32_t tag_id;
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<a name="l00014"></a>00014 <span class="keywordtype">char</span> buffer[16];
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<a name="l00015"></a>00015
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<a name="l00016"></a>00016 <span class="keywordflow">if</span> ((tag_id = mfc_tag_reserve()) == MFC_TAG_INVALID)
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<a name="l00017"></a>00017 {
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<a name="l00018"></a>00018 <span class="keywordflow">return</span> <a class="code" href="../../d8/da1/group__environment__error.html#g05b3a70831c823a59014c4853a76ca7e" title="Internal MOC (implementation) error.">MOC_ERR_INTERN</a>;
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<a name="l00019"></a>00019 }
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<a name="l00020"></a>00020
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<a name="l00021"></a>00021 <span class="comment">/* transfers have to be multiples of 16 bytes */</span>
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<a name="l00022"></a>00022 remainder_16b = size % 16;
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<a name="l00023"></a>00023
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<a name="l00024"></a>00024 <span class="comment">/* subtracting remainder means the transfer has a valid size now */</span>
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<a name="l00025"></a>00025 size -= remainder_16b;
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<a name="l00026"></a>00026 offset = 0;
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<a name="l00027"></a>00027
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<a name="l00028"></a>00028 <span class="comment">/* first case: transfer of size smaller than maximum allowed one (16kbyte) */</span>
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<a name="l00029"></a>00029 <span class="keywordflow">if</span> (size <= <a class="code" href="../../d1/d82/moc_8h.html#0a017736e25e8020d6ddc62e8fc96141" title="Maximum byte-count which can be transferred by one DMA-transfer.">MAX_DMA_CALL_SIZE</a>)
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<a name="l00030"></a>00030 {
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<a name="l00031"></a>00031 mfc_get(target, source, size, tag_id, 0, 0);
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<a name="l00032"></a>00032 }
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<a name="l00033"></a>00033 <span class="comment">/* second case: transfer of bigger size is simply split into parts of 16kb */</span>
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<a name="l00034"></a>00034 <span class="keywordflow">else</span>
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<a name="l00035"></a>00035 {
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<a name="l00036"></a>00036 remainder_16kb = size % <a class="code" href="../../d1/d82/moc_8h.html#0a017736e25e8020d6ddc62e8fc96141" title="Maximum byte-count which can be transferred by one DMA-transfer.">MAX_DMA_CALL_SIZE</a>;
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<a name="l00037"></a>00037 <span class="keywordflow">while</span> (offset + <a class="code" href="../../d1/d82/moc_8h.html#0a017736e25e8020d6ddc62e8fc96141" title="Maximum byte-count which can be transferred by one DMA-transfer.">MAX_DMA_CALL_SIZE</a> <= size)
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<a name="l00038"></a>00038 {
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<a name="l00039"></a>00039 mfc_get(target + offset, source + offset, <a class="code" href="../../d1/d82/moc_8h.html#0a017736e25e8020d6ddc62e8fc96141" title="Maximum byte-count which can be transferred by one DMA-transfer.">MAX_DMA_CALL_SIZE</a>,
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<a name="l00040"></a>00040 tag_id, 0, 0);
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<a name="l00041"></a>00041 offset += <a class="code" href="../../d1/d82/moc_8h.html#0a017736e25e8020d6ddc62e8fc96141" title="Maximum byte-count which can be transferred by one DMA-transfer.">MAX_DMA_CALL_SIZE</a>;
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<a name="l00042"></a>00042 }
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<a name="l00043"></a>00043 <span class="keywordflow">if</span> (remainder_16kb > 0)
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<a name="l00044"></a>00044 {
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<a name="l00045"></a>00045 mfc_get(target + offset, source + offset, remainder_16kb, tag_id,
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<a name="l00046"></a>00046 0, 0);
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<a name="l00047"></a>00047 }
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<a name="l00048"></a>00048 }
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<a name="l00049"></a>00049 <span class="comment">/* if size was reduced previously the remaining bytes have to be transfered */</span>
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<a name="l00050"></a>00050 <span class="keywordflow">if</span> (remainder_16b > 0)
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<a name="l00051"></a>00051 {
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<a name="l00052"></a>00052 <span class="comment">/* minimum allowed transfer is 16bytes so transfer this size into a buffer */</span>
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<a name="l00053"></a>00053 mfc_get(buffer, source + size, 16, tag_id, 0, 0);
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<a name="l00054"></a>00054 <span class="comment">/* waiting for dma completion necessary */</span>
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<a name="l00055"></a>00055 mfc_write_tag_mask(1 << tag_id);
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<a name="l00056"></a>00056 mfc_read_tag_status_all();
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<a name="l00057"></a>00057 <span class="comment">/* copy only the valid bytes into the target buffer */</span>
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<a name="l00058"></a>00058 memcpy(target + size, buffer, remainder_16b);
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<a name="l00059"></a>00059 }
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<a name="l00060"></a>00060 <span class="keywordflow">else</span>
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<a name="l00061"></a>00061 {
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<a name="l00062"></a>00062 <span class="comment">/* waiting for dma completion necessary */</span>
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<a name="l00063"></a>00063 mfc_write_tag_mask(1 << tag_id);
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<a name="l00064"></a>00064 mfc_read_tag_status_all();
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<a name="l00065"></a>00065 }
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<a name="l00066"></a>00066
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<a name="l00067"></a>00067 mfc_tag_release(tag_id);
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<a name="l00068"></a>00068 <span class="keywordflow">return</span> <a class="code" href="../../d8/da1/group__environment__error.html#g8a73ed6676bcf0c0607d98482ca1aca4" title="No error.">MOC_SUCCESS</a>;
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<a name="l00069"></a>00069 }
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<a name="l00070"></a>00070
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</pre></div></div>
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<hr size="1"><address style="text-align: right;"><small>Generated on Thu Feb 12 13:49:47 2009 for MPI On Cell (Documentation) by
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