include/asm-x86_64/scatterlist.h

   1 #ifndef _X8664_SCATTERLIST_H
   2 #define _X8664_SCATTERLIST_H
   3
   4 struct scatterlist {
   5     struct page         *page;
   6     unsigned int        offset;
   7     unsigned int        length;
   8     dma_addr_t          dma_address;
   9     unsigned int        dma_length;
  10 };
  11
  12 #define ISA_DMA_THRESHOLD (0x00ffffff)
  13
  14 /* These macros should be used after a pci_map_sg call has been done
  15  * to get bus addresses of each of the SG entries and their lengths.
  16  * You should only work with the number of sg entries pci_map_sg
  17  * returns.
  18  */
  19 #define sg_dma_address(sg)     ((sg)->dma_address)
  20 #define sg_dma_len(sg)         ((sg)->dma_length)
  21
  22 #endif