include/asm-x86_64/scatterlist.h

   1 #ifndef _X8664_SCATTERLIST_H
   2 #define _X8664_SCATTERLIST_H
   3
   4 #include <asm/types.h>
   5
   6 struct scatterlist {
   7     struct page         *page;
   8     unsigned int        offset;
   9     unsigned int        length;
  10     dma_addr_t          dma_address;
  11     unsigned int        dma_length;
  12 };
  13
  14 #define ISA_DMA_THRESHOLD (0x00ffffff)
  15
  16 /* These macros should be used after a pci_map_sg call has been done
  17  * to get bus addresses of each of the SG entries and their lengths.
  18  * You should only work with the number of sg entries pci_map_sg
  19  * returns.
  20  */
  21 #define sg_dma_address(sg)     ((sg)->dma_address)
  22 #define sg_dma_len(sg)         ((sg)->dma_length)
  23
  24 #endif