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         char            *__address;     /* for set_dma_addr              */
  13 };
  14
  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, or alternatively stop on the first sg_dma_len(sg) which
  20  * is 0.
  21  */
  22 #define sg_dma_address(sg)      ((sg)->dma_address)
  23 #define sg_dma_len(sg)          ((sg)->length)
  24
  25 #endif /* _ASMARM_SCATTERLIST_H */