LXR linux/arch/arm/include/asm/scatterlist.h

   1#ifndef _ASMARM_SCATTERLIST_H
   2#define _ASMARM_SCATTERLIST_H
   3
   4#include <asm/memory.h>
   5#include <asm/types.h>
   6
   7struct 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 */
  28