Root/include/asm-generic/scatterlist.h

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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