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aafe4dbe AB |
1 | #ifndef __ASM_GENERIC_SCATTERLIST_H |
2 | #define __ASM_GENERIC_SCATTERLIST_H | |
3 | ||
4 | #include <linux/types.h> | |
5 | ||
6 | struct 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; | |
18e98307 | 14 | #ifdef CONFIG_NEED_SG_DMA_LENGTH |
aafe4dbe | 15 | unsigned int dma_length; |
18e98307 | 16 | #endif |
aafe4dbe AB |
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) | |
18e98307 FT |
27 | |
28 | #ifdef CONFIG_NEED_SG_DMA_LENGTH | |
aafe4dbe AB |
29 | #define sg_dma_len(sg) ((sg)->dma_length) |
30 | #else | |
31 | #define sg_dma_len(sg) ((sg)->length) | |
18e98307 | 32 | #endif |
aafe4dbe | 33 | |
aafe4dbe | 34 | #endif /* __ASM_GENERIC_SCATTERLIST_H */ |