src/spu/internal/dma/imoc_dma-iget_spu.c

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#include <spu_mfcio.h>
#include <string.h>
#include <stdlib.h>

#include <moc.h>
#include <spu/moc_dma_spu.h>
#include <internal/imoc_macros.h>
#include <internal/spu/imoc_dma_spu.h>

int IMOC_iget_data(void* target, uint64_t source, uint32_t size,
        imoc_dma_request* request)
    {
    uint32_t remainder_16b;
    uint32_t remainder_16kb;
    uint32_t offset;
    uint32_t tag_id;

    if ((tag_id = mfc_tag_reserve()) == MFC_TAG_INVALID)
        {
        return MOC_ERR_INTERN;
        }

    /* transfers have to be multiples of 16 bytes */
    remainder_16b = size % 16;

    request->remainder = 0;
    request->size = size;
    request->target = target;
    request->tag_id = tag_id;

    /* subtracting remainder means the transfer has a valid size now */
    size -= remainder_16b;
    offset = 0;

    /* first case: transfer of size smaller than maximum allowed one (16kbyte) */
    if (size <= MAX_DMA_CALL_SIZE)
        {
        mfc_get(target, source, size, tag_id, 0, 0);
        }
    /* second case: transfer of bigger size is simply split into parts of 16kb */
    else
        {
        remainder_16kb = size % MAX_DMA_CALL_SIZE;
        while (offset + MAX_DMA_CALL_SIZE <= size)
            {
            mfc_get(target + offset, source + offset, MAX_DMA_CALL_SIZE,
                    tag_id, 0, 0);
            offset += MAX_DMA_CALL_SIZE;
            }
        if (remainder_16kb > 0)
            {
            mfc_get(target + offset, source + offset, remainder_16kb, tag_id,
                    0, 0);
            }
        }
    /* if size was reduced previously the remaining bytes have to be transfered */
    if (remainder_16b > 0)
        {
        request->buffer = (char*) malloc(16 * sizeof(char));
        /* minimum allowed transfer is 16bytes so transfer this size into a buffer */
        mfc_get(request->buffer, source + size, 16, tag_id, 0, 0);
        request->remainder = remainder_16b;
        }

    return MOC_SUCCESS;
    }

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