linux/include/asm-generic/scatterlist.h
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   1#ifndef __ASM_GENERIC_SCATTERLIST_H
   2#define __ASM_GENERIC_SCATTERLIST_H
   3
   4#include <linux/types.h>
   5
   6struct scatterlist {
   7#ifdef CONFIG_DEBUG_SG
   8        unsigned long   sg_magic;
   9#endif
  10        unsigned long   page_link;
  11        unsigned int    offset;
  12        unsigned int    length;
  13        dma_addr_t      dma_address;
  14#ifdef CONFIG_NEED_SG_DMA_LENGTH
  15        unsigned int    dma_length;
  16#endif
  17};
  18
  19/*
  20 * These macros should be used after a dma_map_sg call has been done
  21 * to get bus addresses of each of the SG entries and their lengths.
  22 * You should only work with the number of sg entries pci_map_sg
  23 * returns, or alternatively stop on the first sg_dma_len(sg) which
  24 * is 0.
  25 */
  26#define sg_dma_address(sg)      ((sg)->dma_address)
  27
  28#ifdef CONFIG_NEED_SG_DMA_LENGTH
  29#define sg_dma_len(sg)          ((sg)->dma_length)
  30#else
  31#define sg_dma_len(sg)          ((sg)->length)
  32#endif
  33
  34#endif /* __ASM_GENERIC_SCATTERLIST_H */
  35
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