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    • 2. 发明申请
    • DESTRUCTIVE DMA LISTS
    • 破坏性DMA列表
    • WO2007045657A1
    • 2007-04-26
    • PCT/EP2006/067508
    • 2006-10-17
    • INTERNATIONAL BUSINESS MACHINES CORPORATIONIBM UNITED KINGDOM LIMITEDDAY, Michael, NormanJOHNS, Charles, RayMINOR, Barry
    • DAY, Michael, NormanJOHNS, Charles, RayMINOR, Barry
    • G06F13/28
    • G06F13/28
    • A buffer, a method, and a computer program product for DMA transfers are provided that are designed to save memory space within a local memory of a processor. The buffer is a return buffer with a portion reserved for DMA lists. A DMA controller accomplishes DMA transfers by: reading address elements from a DMA list located in the DMA list portion; reading the corresponding data from system memory; and copying the corresponding data to the return buffer portion. This buffer saves space because when the buffer begins to fill up the corresponding return data can overwrite the data in the DMA list. Accordingly, the DMA list overlays on top of the return buffer, such that the return data can destroy the DMA list and the extra storage space for the DMA list is saved.
    • 提供了用于DMA传输的缓冲器,方法和计算机程序产品,其被设计为在处理器的本地存储器内节省存储器空间。 缓冲区是具有为DMA列表保留的部分的返回缓冲区。 DMA控制器通过以下方式完成DMA传输:从位于DMA列表部分的DMA列表读取地址元素; 从系统内存读取相应的数据; 并将相应的数据复制到返回缓冲器部分。 此缓冲区可节省空间,因为当缓冲区开始填满相应的返回数据时,可以覆盖DMA列表中的数据。 因此,DMA列表覆盖在返回缓冲器的顶部,使得返回数据可以破坏DMA列表,并且保存DMA列表的额外的存储空间。