text: #ifndef __ASM_SH_SCATTERLIST_H
  #define __ASM_SH_SCATTERLIST_H
  
  struct scatterlist {
      struct page * page; /* Location for highmem page, if any */
      unsigned int offset;/* for highmem, page offset */
      dma_addr_t dma_address;
      unsigned int length;
  };
  
  #define ISA_DMA_THRESHOLD (0x1fffffff)
  
  /* These macros should be used after a pci_map_sg call has been done
   * to get bus addresses of each of the SG entries and their lengths.
   * You should only work with the number of sg entries pci_map_sg
   * returns, or alternatively stop on the first sg_dma_len(sg) which
   * is 0.
   */
  #define sg_dma_address(sg)	((sg)->dma_address)
  #define sg_dma_len(sg)		((sg)->length)
  
  #endif /* !(__ASM_SH_SCATTERLIST_H) */
  