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 */