release/src-rt-6.x/linux/linux-2.6/include/asm-arm/scatterlist.h

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