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1da177e4 LT |
1 | #ifndef __ASM_SCATTERLIST_H |
2 | #define __ASM_SCATTERLIST_H | |
3 | ||
4 | struct scatterlist { | |
5 | struct page * page; | |
6 | unsigned int offset; | |
7 | dma_addr_t dma_address; | |
8 | unsigned int length; | |
9 | }; | |
10 | ||
11 | /* | |
12 | * These macros should be used after a pci_map_sg call has been done | |
13 | * to get bus addresses of each of the SG entries and their lengths. | |
14 | * You should only work with the number of sg entries pci_map_sg | |
15 | * returns, or alternatively stop on the first sg_dma_len(sg) which | |
16 | * is 0. | |
17 | */ | |
18 | #define sg_dma_address(sg) ((sg)->dma_address) | |
19 | #define sg_dma_len(sg) ((sg)->length) | |
20 | ||
21 | #define ISA_DMA_THRESHOLD (0x00ffffffUL) | |
22 | ||
23 | #endif /* __ASM_SCATTERLIST_H */ |