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scatterlist.h

#ifndef __ASM_SCATTERLIST_H
#define __ASM_SCATTERLIST_H

#include <asm/types.h>

struct scatterlist {
#ifdef CONFIG_DEBUG_SG
      unsigned long     sg_magic;
#endif
      unsigned long     page_link;
      unsigned int      offset;
      dma_addr_t  dma_address;
      unsigned int      length;
};

/*
 * These macros should be used after a pci_map_sg call has been done
 * to get bus addresses of each of the SG entries and their lengths.
 * You should only work with the number of sg entries pci_map_sg
 * returns, or alternatively stop on the first sg_dma_len(sg) which
 * is 0.
 */
#define sg_dma_address(sg)    ((sg)->dma_address)
#define sg_dma_len(sg)        ((sg)->length)

#define ISA_DMA_THRESHOLD (0x00ffffffUL)

#endif /* __ASM_SCATTERLIST_H */

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