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 #ifdef CONFIG_DEBUG_SG
   9         unsigned long   sg_magic;
  10 #endif
  11         unsigned long   page_link;
  12         unsigned int    offset;         /* buffer offset                 */
  13         dma_addr_t      dma_address;    /* dma address                   */
  14         unsigned int    length;         /* length                        */
  15 };
  16
  17 /*
  18  * These macros should be used after a pci_map_sg call has been done
  19  * to get bus addresses of each of the SG entries and their lengths.
  20  * You should only work with the number of sg entries pci_map_sg
  21  * returns, or alternatively stop on the first sg_dma_len(sg) which
  22  * is 0.
  23  */
  24 #define sg_dma_address(sg)      ((sg)->dma_address)
  25 #define sg_dma_len(sg)          ((sg)->length)
  26
  27 #endif /* _ASMARM_SCATTERLIST_H */